/* 
======================================================
  sim-components.css 
  阿偉的物理 x AI 實驗室 - 互動式模擬標準元件庫
  
  【重要家規】AI 開發者請注意：
  禁止在此系統外自創與佈局相關的 class 或使用 inline style。
  所有新開發的模擬器必須使用本檔案提供的 .sim- 類別。
======================================================
*/

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700&display=swap');

body {
    font-family: 'Noto Sans TC', sans-serif;
    color: var(--sim-text-main);
}

:root {
    /* 色彩系統 (Color System) */
    --sim-brand-primary: #657954;      /* 主色：綠色 */
    --sim-brand-hover: #526344;
    --sim-action-blue: #3B82F6;        /* 強調色：藍色 */
    --sim-action-blue-hover: #2563EB;
    
    --sim-bg-main: #f8fafc;
    --sim-bg-light: #f8fafc;
    --sim-bg-panel: rgba(255, 255, 255, 0.85);
    
    --sim-text-main: #1e293b;
    --sim-text-muted: #64748b;
    --sim-border: rgba(226, 232, 240, 0.6);
    --sim-border-light: #e2e8f0;
    --sim-warning-amber: #d97706;
    --sim-danger-red: #dc2626;
    
    /* 幾何與間距 (Geometry & Spacing) */
    --sim-radius-sm: 8px;
    --sim-radius-md: 16px;
    --sim-radius-lg: 24px;
    
    --sim-space-xs: 4px;
    --sim-space-sm: 8px;
    --sim-space-md: 16px;
    --sim-space-lg: 24px;
    
    /* 陰影 (Shadows) */
    --sim-shadow-panel: 0 -8px 30px rgba(0, 0, 0, 0.12);
    --sim-shadow-overlay: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* 圖表與強調色 (Charts & Accents) */
    --sim-chart-y: #3B82F6;
    --sim-chart-v: #10B981;
    --sim-chart-a: #EF4444;
    --sim-accent-color: #EF4444;
}

/* 全域重置：確保所有模擬器的 body/main 都能正確撐滿視窗 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] {
    display: none !important;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

main {
    height: 100%;
    overflow: hidden;
}

/* ==========================================================================
   1. 應用程式外框 (App Shell)
   ========================================================================== */
.sim-app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    overflow: hidden;
    background-color: var(--sim-bg-main);
    font-family: 'Noto Sans TC', 'Inter', system-ui, -apple-system, sans-serif;
}

.sim-canvas-container {
    flex: 1; /* 佔滿剩餘空間 */
    min-width: 0; /* 必須設定 0，否則 Flex 子元素無法收縮至小於內容大小 */
    min-height: 0;
    position: relative;
    container-name: sim-canvas;
    container-type: inline-size;
    background: #ffffff;
    /* 避免手勢干擾 */
    overflow: hidden;
    touch-action: none;
}

/* canvas 預設是 inline，會產生 baseline 縫隙（底部白線）。強制 block 修掉。 */
.sim-canvas-container canvas {
    position: absolute;
    left: 0;
    top: 0;
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.sim-canvas-container > #simCanvas {
    width: 100%;
    height: 100%;
    touch-action: none;
}

.sim-canvas-text-editor {
    position: absolute;
    z-index: 30;
    min-width: 120px;
    max-width: min(440px, calc(100% - 24px));
    height: auto;
    margin: 0;
    padding: 5px 9px;
    border: 2px solid var(--sim-action-blue);
    border-radius: 7px;
    outline: none;
    background: rgba(255, 255, 255, 0.96);
    color: #111827;
    font-family: "Noto Sans TC", system-ui, sans-serif;
    font-weight: 500;
    line-height: 1.25;
    text-align: center;
    box-shadow: 0 5px 16px rgba(37, 99, 235, 0.2);
    transform-origin: center;
}

.sim-canvas-text-editor:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), 0 5px 16px rgba(37, 99, 235, 0.18);
}

.sim-canvas-text-editor[hidden] {
    display: none !important;
}

.sim-canvas-is-draggable {
    cursor: grab;
}

.sim-canvas-is-dragging {
    cursor: grabbing;
}

/* ==========================================================================
   2. 響應式控制面板 & 三段式抽屜 (Responsive Control Panel & 3-State Bottom Sheet)
   ========================================================================== */
.sim-panel {
    background: var(--sim-bg-panel);
    backdrop-filter: blur(24px) saturate(150%);
    -webkit-backdrop-filter: blur(24px) saturate(150%);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

/* --- 手機版 (Mobile First): 預設為底部抽屜 --- */
@media (max-width: 768px) {
    .sim-panel {
        width: 100%;
        border-top-left-radius: var(--sim-radius-lg);
        border-top-right-radius: var(--sim-radius-lg);
        box-shadow: var(--sim-shadow-panel);
        transition: height 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
        overflow: hidden; /* 防止內容在縮放時溢出 */
    }

    /* 三段高度設定 */
    .sim-panel.state-full {
        height: 70dvh;
    }
    
    .sim-panel.state-half {
        height: 35dvh; 
    }
    
    .sim-panel.state-collapsed {
        height: 56px; /* 只顯示標題列的高度 */
    }

    /* 手機版箭頭圖示 */
    .sim-mobile-toggle-icon {
        display: block;
        color: var(--sim-brand-primary);
        font-size: 1.2rem;
        transition: transform 0.3s ease;
    }
    
    .sim-panel.state-collapsed .sim-mobile-toggle-icon {
        transform: rotate(180deg);
    }
}

/* --- 電腦版 (Desktop): 右側邊欄 --- */
@media (min-width: 769px) {
    .sim-app-shell {
        flex-direction: row; /* 水平排列 Canvas 和 Panel */
    }
    
    .sim-panel {
        width: 380px;
        height: 100%;
        border-left: 1px solid var(--sim-border);
        box-shadow: -2px 0 10px rgba(0,0,0,0.05);
        /* 桌面版無三段式抽屜，強制全開 */
    }
    
    .sim-mobile-toggle-icon {
        display: none; /* 隱藏手機版切換箭頭 */
    }
}

/* ==========================================================================
   3. 面板內部結構 (Panel Internals)
   ========================================================================== */
.sim-panel-header {
    padding: var(--sim-space-md);
    background: var(--sim-bg-panel);
    cursor: pointer; /* 點擊/拖曳區 (預設為手機版，可點擊展開) */
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sim-panel-header:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.65);
    outline-offset: -4px;
    border-radius: var(--sim-radius-sm);
}

@media (min-width: 769px) {
    .sim-panel-header {
        cursor: default !important; /* 電腦版不顯示點擊指標 */
    }
}

@media (max-width: 768px) {
    .sim-panel-header {
        justify-content: space-between;
        padding-left: var(--sim-space-lg);
        padding-right: var(--sim-space-lg);
    }
    /* 手機版：標題 wrapper 置中（flex 容器用 justify-content） */
    .sim-panel-title-wrapper {
        justify-content: center;
    }
    /* 標題本身是 flex，需用 justify-content 置中內部文字 */
    .sim-panel-title {
        justify-content: center;
        width: 100%;
    }
}

.sim-panel-title-wrapper {
    display: flex;
    flex: 1;
    justify-content: flex-start;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--sim-brand-primary);
}

.sim-panel-title {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 700;
    font-family: 'Noto Sans TC', sans-serif;
    line-height: 1.2;
    letter-spacing: normal;
    color: var(--sim-brand-primary);
    display: flex;
    align-items: center;
    gap: var(--sim-space-sm);
}

.sim-panel-body {
    padding: var(--sim-space-md);
    overflow-y: auto;
    /* 防呆排版法：使用 flex column + gap */
    display: flex;
    flex-direction: column;
    gap: var(--sim-space-md);
    flex: 1;
}

/* 物理題圖編輯器：固定常用操作、三分頁與情境式屬性面板 */
.diagram-panel-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sim-space-sm);
    padding: 8px var(--sim-space-md) 10px;
    flex-shrink: 0;
    background: var(--sim-bg-panel);
}

.diagram-history-actions {
    display: flex;
    gap: 6px;
}

.diagram-toolbar-button {
    min-height: 36px;
    padding: 6px 10px;
    border: 1px solid var(--sim-border);
    border-radius: 9px;
    background: var(--sim-bg-panel);
    color: var(--sim-text-main);
    font: inherit;
    font-size: 0.84rem;
    font-weight: 650;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: background-color 120ms ease, border-color 120ms ease, transform 100ms ease;
}

.diagram-toolbar-button:hover:not(:disabled) {
    background: var(--sim-bg-light);
    border-color: var(--sim-brand-primary);
}

.diagram-toolbar-button:active:not(:disabled) {
    transform: scale(0.97);
}

.diagram-toolbar-button:focus-visible,
.diagram-panel-tab:focus-visible,
.diagram-disclosure > summary:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.42);
    outline-offset: 2px;
}

.diagram-toolbar-button:disabled {
    opacity: 0.38;
    cursor: default;
}

.diagram-toolbar-icon {
    color: var(--sim-brand-primary);
    font-size: 1.15rem;
    line-height: 1;
}

.diagram-object-count {
    color: var(--sim-text-muted);
    font-size: 0.8rem;
    white-space: nowrap;
}

.diagram-object-count strong {
    color: var(--sim-text-main);
    font-size: 0.95rem;
}

.diagram-panel-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 4px;
    padding: 0 var(--sim-space-md) 12px;
    flex-shrink: 0;
    background: var(--sim-bg-panel);
    border-bottom: 1px solid var(--sim-border);
}

.diagram-panel-tab {
    min-height: 38px;
    border: 0;
    border-radius: 9px;
    background: transparent;
    color: var(--sim-text-muted);
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: color 140ms ease, background-color 140ms ease, transform 100ms ease;
}

.diagram-panel-tab:hover:not(.is-active) {
    color: var(--sim-text-main);
    background: var(--sim-bg-light);
}

.diagram-panel-tab:active {
    transform: scale(0.97);
}

.diagram-panel-tab.is-active,
.diagram-panel-tab[aria-selected="true"] {
    color: #fff;
    background: var(--sim-brand-primary);
    box-shadow: 0 2px 7px rgba(30, 41, 59, 0.14);
}

.diagram-panel-body {
    gap: 0;
}

.diagram-tab-panel,
.diagram-selection-panel,
.diagram-panel-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.diagram-tab-panel[hidden],
.diagram-selection-panel[hidden],
.diagram-property-card[hidden] {
    display: none !important;
}

.diagram-empty-state {
    min-height: 260px;
    padding: 28px 18px;
    border: 1px dashed var(--sim-border);
    border-radius: var(--sim-radius-md);
    background: var(--sim-bg-light);
    color: var(--sim-text-muted);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.diagram-empty-state[hidden] {
    display: none !important;
}

.diagram-empty-state h3,
.diagram-empty-state p {
    margin: 0;
}

.diagram-empty-state h3 {
    color: var(--sim-text-main);
    font-size: 1.02rem;
}

.diagram-empty-state p {
    max-width: 28ch;
    font-size: 0.88rem;
    line-height: 1.65;
}

.diagram-empty-icon {
    width: 44px;
    height: 44px;
    border: 2px solid var(--sim-border);
    border-radius: 12px;
    color: var(--sim-brand-primary);
    display: grid;
    place-items: center;
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.diagram-selection-heading,
.diagram-section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.diagram-selection-heading h3,
.diagram-section-heading h3,
.diagram-panel-section > h3 {
    margin: 2px 0 0;
    color: var(--sim-text-main);
    font-size: 1.08rem;
    line-height: 1.35;
    letter-spacing: -0.01em;
}

.diagram-eyebrow {
    color: var(--sim-text-muted);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.06em;
}

.diagram-position-chip,
.diagram-format-chip {
    padding: 5px 8px;
    border: 1px solid var(--sim-border);
    border-radius: 999px;
    background: var(--sim-bg-light);
    color: var(--sim-text-muted);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.76rem;
    font-weight: 700;
    white-space: nowrap;
}

.diagram-selection-hint {
    margin: 0;
    line-height: 1.55;
}

.diagram-property-card {
    padding: 14px;
    border: 1px solid rgba(59, 130, 246, 0.24);
    border-radius: 12px;
    background: var(--sim-bg-light);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.diagram-property-card h4 {
    margin: 0;
    color: var(--sim-action-blue);
    font-size: 0.82rem;
    letter-spacing: 0.03em;
}

.diagram-smart-properties > div:not([hidden]) {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.diagram-disclosure {
    overflow: hidden;
    border: 1px solid var(--sim-border);
    border-radius: 12px;
    background: var(--sim-bg-panel);
}

.diagram-disclosure > summary {
    min-height: 44px;
    padding: 10px 38px 10px 13px;
    color: var(--sim-text-main);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
    position: relative;
    display: flex;
    align-items: center;
}

.diagram-disclosure > summary::-webkit-details-marker {
    display: none;
}

.diagram-disclosure > summary::after {
    content: '⌄';
    position: absolute;
    right: 14px;
    top: 50%;
    color: var(--sim-text-muted);
    font-size: 1rem;
    transform: translateY(-52%) rotate(-90deg);
    transition: transform 160ms ease;
}

.diagram-disclosure[open] > summary {
    border-bottom: 1px solid var(--sim-border);
}

.diagram-disclosure[open] > summary::after {
    transform: translateY(-52%) rotate(0deg);
}

.diagram-disclosure-content {
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.diagram-disclosure:not([open]) > .diagram-disclosure-content {
    display: none;
}

.diagram-danger-disclosure > summary {
    color: #b91c1c;
}

.diagram-delete-row,
.diagram-export-row {
    margin-top: 2px;
}

.diagram-panel-section + .diagram-panel-section {
    padding-top: 18px;
    border-top: 1px solid var(--sim-border);
}

.diagram-section-description {
    margin: -8px 0 0;
    color: var(--sim-text-muted);
    font-size: 0.84rem;
    line-height: 1.6;
}

@media (prefers-reduced-motion: reduce) {
    .diagram-toolbar-button,
    .diagram-panel-tab,
    .diagram-disclosure > summary::after {
        transition: none;
    }

}

/* 控制元件群組 (用來包覆多個按鈕或滑桿，維持統一間距) */
.sim-control-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ==========================================================================
   4. UI 元件 (UI Components)
   ========================================================================== */

/* --- 區塊標題 (Section Group) --- */
.sim-group-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--sim-text-muted);
    border-bottom: 1px solid var(--sim-border);
    padding-bottom: var(--sim-space-xs);
    margin-bottom: var(--sim-space-sm);
    margin-top: var(--sim-space-lg);
}

.sim-group-title:first-child {
    margin-top: 0;
}

/* --- 滑桿包裝 (Slider Wrapper) --- */
.sim-slider-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--sim-space-sm);
}

.sim-slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    color: var(--sim-text-main);
}

.sim-slider-label {
    font-weight: 500;
}

.sim-slider-val {
    font-family: 'Courier New', Courier, monospace;
    font-weight: 600;
    color: var(--sim-action-blue);
    background: #eff6ff;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.sim-slider {
    width: 100%;
    margin: 0;
    cursor: pointer;
    -webkit-appearance: none;
    background: transparent;
}
.sim-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    background: rgba(0,0,0,0.06);
    border-radius: 4px;
}
.sim-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2), 0 0 1px rgba(0,0,0,0.1);
    margin-top: -6px;
    transition: transform 0.1s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.sim-slider::-webkit-slider-thumb:active {
    transform: scale(1.15);
}

.sim-slider:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.45);
    outline-offset: 4px;
    border-radius: var(--sim-radius-sm);
}

/* --- 按鈕群組 (Button Group) --- */
/* 預設：一行一個按鈕（flex-direction: column） */
.sim-btn-row {
    display: flex;
    flex-direction: row;
    gap: var(--sim-space-sm);
}

/* --- 撥動開關 (Toggle Switch) --- */
/* 垂直清單容器 (iOS Settings 風格) */
.sim-toggle-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sim-toggle {
    position: relative; /* 將隱藏輸入框限制在元件內，避免外框被焦點捲動。 */
    display: flex;
    align-items: center;
    justify-content: space-between;  /* 文字靠左、開關靠右 */
    gap: var(--sim-space-md);
    padding: 9px 4px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--sim-text-main);
    user-select: none;
    border-bottom: 1px solid rgba(0,0,0,0.05); /* 淡淡分隔線 */
    transition: background 0.15s ease;
    border-radius: var(--sim-radius-sm);
}

.sim-toggle:last-child {
    border-bottom: none;
}

.sim-toggle:hover {
    background: rgba(0,0,0,0.03);
}

.sim-toggle-label {
    flex: 1;  /* 文字區域自動填滿剩餘空間 */
}

.sim-toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
    margin: 0;
    pointer-events: none;
}

.sim-toggle-track {
    flex-shrink: 0;
    width: 44px;
    height: 24px;
    background: #cbd5e1; /* Clear gray for OFF state */
    border-radius: 24px;
    position: relative;
    transition: background 0.3s ease;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.sim-toggle-thumb {
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.sim-toggle-input:checked + .sim-toggle-track {
    background: var(--sim-brand-primary);
}

.sim-toggle-input:checked + .sim-toggle-track .sim-toggle-thumb {
    transform: translateX(20px);
}

.sim-toggle-input:indeterminate + .sim-toggle-track {
    background: var(--sim-warning-amber);
}

.sim-toggle-input:indeterminate + .sim-toggle-track .sim-toggle-thumb {
    transform: translateX(10px);
}

.sim-toggle-input:focus-visible + .sim-toggle-track {
    outline: 3px solid rgba(59, 130, 246, 0.45);
    outline-offset: 3px;
}

/* --- 複選下拉選單 (Multi-select Dropdown) --- */
.sim-multiselect {
    position: relative;
    width: 100%;
}

.sim-multiselect-trigger {
    width: 100%;
}

.sim-multiselect-menu {
    position: absolute;
    top: calc(100% + var(--sim-space-sm));
    left: 0;
    right: 0;
    z-index: 80;
    max-height: min(380px, 48vh);
    overflow-y: auto;
    background: #ffffff;
    border: 1px solid var(--sim-border-light);
    box-shadow: var(--sim-shadow-overlay);
}

.sim-multiselect-group + .sim-multiselect-group {
    margin-top: var(--sim-space-sm);
    padding-top: var(--sim-space-sm);
    border-top: 1px solid var(--sim-border-light);
}

.sim-multiselect-children {
    margin-left: 22px;
    padding-left: 10px;
    border-left: 2px solid var(--sim-border-light);
}

.sim-btn {
    flex: 1;
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sim-space-sm);
    min-height: 48px;
    padding: 12px 16px;
    border-radius: var(--sim-radius-md);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition:
        background-color 150ms cubic-bezier(0.2, 0.8, 0.2, 1),
        color 150ms cubic-bezier(0.2, 0.8, 0.2, 1),
        box-shadow 150ms cubic-bezier(0.2, 0.8, 0.2, 1),
        opacity 150ms cubic-bezier(0.2, 0.8, 0.2, 1),
        transform 150ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sim-btn:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.65);
    outline-offset: 3px;
}

.sim-btn:active {
    transform: scale(0.95);
}

.sim-btn-label {
    line-height: 1.3;
}

.sim-btn-label sub {
    font-size: 0.7em;
    line-height: 0;
    vertical-align: sub;
}

.sim-btn-primary {
    background: var(--sim-brand-primary);
    color: white;
}

.sim-btn-primary:hover {
    background: var(--sim-brand-hover);
}

.sim-btn-secondary {
    background: var(--sim-brand-hover);  /* 深一點的綠，和 primary 有層次感 */
    border: none;
    color: white;
}

.sim-btn-secondary:hover {
    background: var(--sim-brand-primary);
}

/* 下拉欄位外觀：保留標準按鈕互動，但視覺上是表單欄位。 */
.sim-btn.sim-multiselect-trigger {
    justify-content: flex-start;
    background: #ffffff;
    color: var(--sim-text-main);
    border: 1px solid var(--sim-border-light);
    border-radius: var(--sim-radius-sm);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
    text-align: left;
}

.sim-btn.sim-multiselect-trigger::after {
    content: "";
    width: 8px;
    height: 8px;
    margin-left: auto;
    border-right: 2px solid var(--sim-text-muted);
    border-bottom: 2px solid var(--sim-text-muted);
    transform: rotate(45deg) translateY(-2px);
    transition: transform 150ms ease;
}

.sim-btn.sim-multiselect-trigger[aria-expanded="true"]::after {
    transform: rotate(225deg) translate(-2px, -2px);
}

.sim-btn.sim-multiselect-trigger:hover {
    background: var(--sim-bg-light);
    color: var(--sim-text-main);
}

/* 重置/危險操作：淺灰色，低調但可辨識 */
.sim-btn-reset {
    background: #dde3ea;
    border: none;
    color: #64748b;
}

.sim-btn-reset:hover {
    background: #cdd5de;
    color: #475569;
}

.sim-btn-danger {
    background: #ef4444;
    color: white;
}

.sim-btn-orange {
    background: #f59e0b;
    color: white;
    border: none;
}

.sim-btn-orange:hover {
    background: #fbbf24;
}

/* ==========================================================================
   6. 浮水印 (Watermark)
   ========================================================================== */
.sim-watermark {
    position: absolute;
    --sim-watermark-edge: 16px;
    right: max(var(--sim-watermark-edge), calc(env(safe-area-inset-right, 0px) + 4px));
    bottom: max(var(--sim-watermark-edge), calc(env(safe-area-inset-bottom, 0px) + 4px));
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    pointer-events: none;
    z-index: 40;
    
    /* 完美置中對齊 */
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    
    /* 預設：淺色畫布適用（深底白字，清晰可見） */
    color: #ffffff;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 深色畫布適用（白底黑字，對比強烈防盜版） */
.sim-watermark.theme-dark {
    color: #111827;
    background: rgba(255, 255, 255, 0.75);
}

/* 依畫布而非視窗寬度縮放；桌面窄畫布與橫向手機也使用小型規格。 */
@container sim-canvas (max-width: 600px) {
    .sim-watermark {
        --sim-watermark-edge: 8px;
        padding: 5px 9px;
        border-radius: 12px;
        box-shadow: none;
        font-size: clamp(10px, 2.6cqw, 11px);
        font-weight: 600;
        backdrop-filter: blur(3px);
        -webkit-backdrop-filter: blur(3px);
    }

    .sim-watermark.theme-dark {
        background: rgba(255, 255, 255, 0.68);
    }
}

/* 舊版 WebView 不支援容器查詢時，維持原有的視窗寬度降級行為。 */
@supports not (container-type: inline-size) {
    @media (max-width: 600px) {
        .sim-watermark {
            --sim-watermark-edge: 8px;
            padding: 5px 9px;
            border-radius: 12px;
            box-shadow: none;
            font-size: clamp(10px, 2.6vw, 11px);
            font-weight: 600;
            backdrop-filter: blur(3px);
            -webkit-backdrop-filter: blur(3px);
        }

        .sim-watermark.theme-dark {
            background: rgba(255, 255, 255, 0.68);
        }
    }
}

.sim-data-item {
    display: flex;
    justify-content: space-between;
    gap: var(--sim-space-lg);
    font-size: 0.95rem;
}

.sim-data-label {
    color: var(--sim-text-muted);
}

.sim-data-val {
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
    color: var(--sim-text-main);
}

.sim-data-val-large {
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
    color: var(--sim-action-blue);
    font-size: 1.25rem;
}

/* 固定高度的抽選／結果摘要，避免文字長度改變時造成版面跳動。 */
.sim-result-layout {
    display: grid;
    grid-template-rows: auto auto;
    gap: var(--sim-space-sm);
    min-width: 0;
}

.sim-result-name {
    min-height: 2.8em;
    overflow: hidden;
    color: var(--sim-action-blue);
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.4;
    overflow-wrap: anywhere;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.sim-result-meta {
    min-height: 3em;
    overflow: hidden;
    color: var(--sim-text-main);
    font-size: 0.95rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

/* === 分段按鈕 (Segmented Control) === */
.sim-segmented-control {
    position: relative; /* 隱藏 radio 隨控制面板捲動，不撐大外框。 */
    display: flex;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
    width: 100%;
}

.sim-segmented-control input[type="radio"] {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.sim-segmented-control label,
.sim-segmented-control button[role="radio"] {
    flex: 1;
    min-width: 0;
    text-align: center;
    padding: 6px 0;
    border: 0;
    border-radius: 6px;
    background: transparent;
    -webkit-appearance: none;
    appearance: none;
    font: inherit;
    font-size: 0.9em;
    color: var(--sim-text-muted);
    cursor: pointer;
    transition:
        background-color 200ms ease,
        color 200ms ease,
        box-shadow 200ms ease;
}

.sim-segmented-control input[type="radio"]:checked + label {
    background: white;
    color: var(--sim-brand-primary);
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sim-segmented-control button[role="radio"][aria-checked="true"] {
    background: white;
    color: var(--sim-brand-primary);
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* 主要工作模式：比一般參數切換更醒目的選中狀態 */
.sim-segmented-control-emphasis input[type="radio"]:checked + label {
    background: var(--sim-brand-primary);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 2px 5px rgba(30, 41, 59, 0.18);
}

.sim-segmented-control-spaced {
    margin-bottom: var(--sim-space-sm);
}

.sim-segmented-control input[type="radio"]:focus-visible + label {
    outline: 3px solid rgba(59, 130, 246, 0.45);
    outline-offset: 1px;
}

.sim-segmented-control button[role="radio"]:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.45);
    outline-offset: 1px;
}

/* 特殊元件：力學能分佈圖 (Energy Bars) */
.sim-energy-bars {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    height: 80px;
    background: var(--sim-bg-panel);
    border-radius: 8px;
    padding: 10px 5px 0 5px;
    border: 1px solid var(--sim-border);
}

.sim-energy-bar-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    height: 100%;
}

.sim-energy-bar-fill {
    width: 24px;
    height: 0;
    border-radius: 4px 4px 0 0;
    transition: height 0.1s;
}

.sim-energy-bar-ke { background-color: #3B82F6; }
.sim-energy-bar-pe { background-color: #10B981; }
.sim-energy-bar-total { background-color: #F59E0B; }

.sim-energy-bar-label {
    font-size: 0.75rem;
    margin-top: 4px;
    color: var(--sim-text-muted);
    font-weight: 700;
}

/* 特殊元件：可收合的資訊面板按鈕 (Toggle Panel Button) */
.sim-toggle-panel-btn {
    padding: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 0.95rem;
    background-color: var(--sim-bg-light);
    transition: background-color 0.2s;
    border-radius: 8px;
}

.sim-toggle-panel-btn:hover {
    background-color: var(--sim-border);
}

.sim-toggle-panel-btn[aria-expanded="true"] {
    background-color: var(--sim-border);
}

.sim-toggle-panel-btn[aria-expanded="true"] .sim-toggle-panel-icon {
    transform: rotate(180deg);
}

.sim-toggle-panel-icon {
    color: var(--sim-text-muted);
    font-size: 0.8rem;
    transition: transform 0.3s;
}

.sim-toggle-panel-content {
    padding: 0 15px 15px 15px;
}

/* 提示文字 */
.sim-text-strong {
    font-weight: 700;
}

.sim-data-item-tip {
    color: var(--sim-brand-primary);
    font-size: 0.85rem;
    justify-content: center;
}

.sim-data-formula {
    display: inline-block;
    margin-top: 2px;
    color: var(--sim-text-muted);
    font-family: "Times New Roman", serif;
    font-size: 0.82em;
    font-weight: 400;
}

/* 
======================================================
  8. 圖例與數學公式 (Legend & Math Card)
======================================================
*/

/* 實驗圖例 */
.sim-legend-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 8px;
    margin-bottom: var(--sim-space-sm);
}

.sim-legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.sim-legend-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.sim-legend-color-line {
    width: 20px;
    height: 3px;
}

.sim-legend-dot-blue { background-color: var(--sim-action-blue); }
.sim-legend-dot-gray { background-color: var(--sim-text-muted); border: 1px solid var(--sim-border); }
.sim-legend-line-red { background-color: var(--sim-chart-a); }
.sim-legend-dot-purple { background-color: #9333EA; }
.sim-legend-dot-green { background-color: #22C55E; }
.sim-legend-dot-red { background-color: #EF4444; }
.sim-legend-dot-yellow { background-color: #EAB308; }

.sim-field-legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 4px;
    color: var(--sim-text-main);
    font-size: 0.9rem;
}

.sim-field-legend-swatch {
    flex-shrink: 0;
    border-radius: 999px;
}

.sim-field-legend-dot {
    width: 14px;
    height: 14px;
}

.sim-field-legend-line {
    width: 22px;
    height: 3px;
}

.sim-field-legend-source {
    background-color: #00C7D1;
    box-shadow: 0 0 8px rgb(0 199 209 / 55%);
}

.sim-field-legend-test {
    background-color: #E60073;
    box-shadow: 0 0 8px rgb(230 0 115 / 45%);
}

.sim-field-legend-field {
    background-color: rgb(100 116 139 / 70%);
}

.sim-field-legend-force {
    background-color: #D4A900;
}

/* Unit and dimension puzzle */
.sim-canvas-static-layer {
    pointer-events: none;
    z-index: 0;
}

.sim-text-keep {
    word-break: keep-all;
    overflow-wrap: break-word;
}

.sim-unit-toolbox::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.sim-unit-toolbox::-webkit-scrollbar-track {
    background: #F1F5F9;
    border-radius: 4px;
}

.sim-unit-toolbox::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 4px;
}

.sim-unit-stage {
    scroll-padding-top: 24px;
}

.sim-unit-piece {
    cursor: grab;
    transition: transform 100ms ease, box-shadow 100ms ease;
    user-select: none;
    touch-action: none;
}

.sim-unit-piece:active {
    cursor: grabbing;
    transform: scale(1.05);
    box-shadow: 0 10px 15px -3px rgb(15 23 42 / 12%);
}

.sim-unit-slot {
    transition: background-color 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.sim-unit-slot.hovered {
    background-color: rgb(59 130 246 / 10%);
    border-color: var(--sim-action-blue);
    box-shadow: 0 0 0 4px rgb(59 130 246 / 20%);
}

.sim-fraction-line {
    width: 100%;
    height: 3px;
    margin: 12px 0;
    border-radius: 2px;
    background-color: var(--sim-text-main);
}

.sim-unit-dragging {
    position: fixed;
    z-index: 9999;
    pointer-events: none;
    opacity: .95;
    box-shadow: 0 15px 25px -5px rgb(15 23 42 / 22%);
    transform: translate(-50%, -50%);
}

@keyframes sim-unit-pop {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.sim-anim-unit-pop {
    animation: sim-unit-pop 300ms cubic-bezier(.175, .885, .32, 1.275);
}

@keyframes sim-unit-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.sim-anim-unit-shake {
    animation: sim-unit-shake 300ms ease-in-out;
}

@media (prefers-reduced-motion: reduce) {
    .sim-anim-unit-pop,
    .sim-anim-unit-shake {
        animation: none;
    }
}

@media (max-width: 768px) {
    #movable-stage.sim-unit-stage {
        padding-top: 72px;
    }
}

/* 數學公式卡片 */
.sim-math-card {
    background-color: var(--sim-bg-main);
    padding: var(--sim-space-md);
    border-radius: var(--sim-radius-sm);
    border: 1px solid var(--sim-border);
    margin-top: var(--sim-space-sm);
}

.sim-math-card-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--sim-text-muted);
    margin-bottom: var(--sim-space-sm);
}

.sim-math-formula {
    font-family: "Times New Roman", serif;
    font-style: italic;
    text-align: center;
    font-size: 1.1rem;
    color: var(--sim-text-main);
    margin: 10px 0;
}

.sim-math-fraction {
    display: inline-block;
    vertical-align: middle;
    margin: 0 4px;
    font-size: 0.9rem;
}

.sim-math-numerator {
    display: block;
    border-bottom: 1px solid currentColor;
    line-height: 1;
    padding-bottom: 2px;
}

.sim-math-denominator {
    display: block;
    line-height: 1;
    padding-top: 2px;
}

.sim-math-description {
    font-size: 0.8rem;
    color: var(--sim-text-muted);
    line-height: 1.5;
    margin-top: 10px;
}

.sim-math-card canvas {
    display: block;
    width: 100%;
    height: 96px;
}

/* === 模擬器資料、圖表與向量元件 === */
.sim-data-card {
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    gap: var(--sim-space-md);
    padding: var(--sim-space-md);
    background: var(--sim-bg-panel);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-md);
}

.sim-data-card-title {
    padding-bottom: var(--sim-space-sm);
    border-bottom: 1px solid var(--sim-border);
    color: var(--sim-text-main);
    font-size: 1rem;
    font-weight: 600;
}

.sim-data-stack {
    display: flex;
    flex-direction: column;
    gap: var(--sim-space-sm);
}

.sim-data-note {
    color: var(--sim-text-muted);
    font-size: 0.78rem;
    line-height: 1.45;
}

.sim-hint-card {
    padding: 12px;
    color: var(--sim-text-muted);
    background: rgba(15, 23, 42, 0.03);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-sm);
    font-size: 0.85rem;
    line-height: 1.6;
}

.sim-camera-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 20;
    width: min(82%, 340px);
    padding: 20px 30px;
    transform: translate(-50%, -50%);
    color: var(--sim-brand-primary);
    background: rgb(255 255 255 / 88%);
    border: 1px solid rgb(255 255 255 / 65%);
    border-radius: var(--sim-radius-md);
    box-shadow: var(--sim-shadow-lg);
    backdrop-filter: blur(8px) saturate(130%);
    text-align: center;
    font-weight: 700;
}

.sim-camera-loading-sub {
    margin-top: 8px;
    color: var(--sim-text-muted);
    font-size: 0.85rem;
    font-weight: 400;
}

.sim-camera-start-btn {
    width: 100%;
    margin-top: var(--sim-space-md);
}

.sim-btn:disabled,
.sim-toggle-input:disabled + .sim-toggle-track {
    cursor: not-allowed;
    opacity: 0.5;
}

.sim-vector-label {
    font-weight: 700;
}

.sim-vector-amber { color: #D97706; }
.sim-vector-cyan { color: #0891B2; }
.sim-vector-pink { color: #DB2777; }

.sim-feedback-message {
    width: 100%;
    color: var(--sim-text-muted);
    line-height: 1.55;
    white-space: normal;
}

.sim-status-stack {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.sim-status-description {
    color: var(--sim-text-muted);
    white-space: normal;
}

.sim-legend-dot-solar {
    background-color: #EAB308;
    box-shadow: 0 0 5px rgb(234 179 8 / 70%);
}

.sim-legend-dot-infrared {
    background-color: #DC2626;
    box-shadow: 0 0 5px rgb(220 38 38 / 60%);
}

.sim-legend-dot-molecule {
    background-color: rgb(255 255 255 / 65%);
    border: 1px solid #CBD5E1;
}

.sim-lotka-chart {
    aspect-ratio: 13 / 6;
    margin-bottom: 5px;
}

.sim-input-invalid {
    border-color: var(--sim-danger-red) !important;
}

.sim-canvas-direct-manipulation {
    touch-action: none;
}

.sim-induction-graph {
    aspect-ratio: 13 / 8;
}

.sim-scroll-list {
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    gap: var(--sim-space-md);
    max-height: 25vh;
    padding-right: 4px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(100, 116, 139, 0.35) transparent;
}

.sim-scroll-list::-webkit-scrollbar { width: 4px; }
.sim-scroll-list::-webkit-scrollbar-thumb {
    background: rgba(100, 116, 139, 0.35);
    border-radius: 4px;
}

.sim-slider-label-group {
    display: flex;
    align-items: center;
    gap: var(--sim-space-sm);
}

.sim-color-dot {
    width: 12px;
    height: 12px;
    flex: 0 0 12px;
    border-radius: 50%;
}

.sim-color-dot-1 { background-color: #3B82F6; }
.sim-color-dot-2 { background-color: #10B981; }
.sim-color-dot-3 { background-color: #F59E0B; }
.sim-color-dot-4 { background-color: #8B5CF6; }
.sim-color-dot-5 { background-color: #EC4899; }
.sim-color-dot-6 { background-color: #06B6D4; }

.sim-text-blue { color: #2563EB; }
.sim-text-red { color: #DC2626; }
.sim-text-green { color: #059669; }
.sim-text-amber { color: #D97706; }

.sim-force-list {
    display: flex;
    flex-direction: column;
    gap: var(--sim-space-sm);
    max-height: 34vh;
    overflow-y: auto;
}

.sim-force-item {
    padding: 12px;
    background: var(--sim-bg-panel);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-sm);
    transition: box-shadow 0.2s ease;
}

.sim-force-item:hover {
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.08);
}

.sim-force-header,
.sim-force-body {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--sim-space-sm);
}

.sim-force-header {
    padding-bottom: 6px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--sim-bg-light);
    font-size: 0.875rem;
}

.sim-force-body {
    flex-wrap: wrap;
}

.sim-force-vector,
.sim-force-angle,
.sim-force-result {
    font-weight: 700;
}

.sim-force-vector {
    text-shadow: 0 0 1px rgba(0, 0, 0, 0.2);
}

.sim-force-angle {
    color: #b45309;
    font-weight: 600;
}

.sim-free-body-editor {
    display: grid;
    gap: 10px;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-sm);
    background: var(--sim-bg-light);
}

.sim-free-body-editor[hidden] { display: none; }

.sim-free-body-list {
    display: grid;
    gap: 6px;
    max-height: 190px;
    overflow-y: auto;
}

.sim-free-body-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px;
}

.sim-free-body-select {
    min-width: 0;
    padding: 8px 10px;
    border: 1px solid var(--sim-border);
    border-radius: 7px;
    background: var(--sim-bg-panel);
    color: var(--sim-text-main);
    font: inherit;
    text-align: left;
    cursor: pointer;
}

.sim-free-body-select[aria-pressed="true"] {
    border-color: var(--sim-action-blue);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--sim-action-blue) 18%, transparent);
}

.sim-free-body-delete {
    width: 36px;
    min-width: 36px;
    padding: 0;
}

.sim-free-body-detail {
    display: grid;
    gap: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--sim-border);
}

.sim-free-body-detail[hidden] { display: none; }

.sim-free-body-field {
    display: grid;
    gap: 5px;
}

.sim-free-body-field > label {
    color: var(--sim-text-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.sim-force-equation {
    color: var(--sim-text-muted);
    font-family: "Times New Roman", serif;
    font-size: 0.8rem;
    font-style: italic;
}

.sim-force-result {
    color: var(--sim-text-main);
    font-family: "Courier New", monospace;
    font-size: 1.05rem;
}

.sim-torque-positive { color: #047857; }
.sim-torque-negative { color: #be123c; }

.sim-net-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sim-space-sm);
    padding: var(--sim-space-md);
    text-align: center;
    background: var(--sim-bg-light);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-md);
}

.sim-net-value {
    color: var(--sim-text-main);
    font-family: "Courier New", monospace;
    font-size: 2.25rem;
    font-weight: 700;
}

.sim-net-unit {
    margin-left: 4px;
    color: var(--sim-text-muted);
    font-size: 0.875rem;
    font-weight: 700;
}

.sim-direction-badge {
    display: inline-block;
    margin-top: 4px;
    padding: 6px 16px;
    color: var(--sim-text-muted);
    background: var(--sim-border);
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 700;
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.sim-direction-badge.positive {
    color: #047857;
    background: #d1fae5;
    border-color: #6ee7b7;
}

.sim-direction-badge.negative {
    color: #be123c;
    background: #ffe4e6;
    border-color: #fda4af;
}

.sim-vector-symbol {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    margin: 0 0.1em;
    line-height: 1;
    vertical-align: middle;
}

.sim-vector-arrow {
    margin-bottom: -0.2em;
    font-size: 0.6em;
}

.sim-vector-char {
    font-family: serif;
}

.sim-vector-sub {
    font-size: 0.6em;
    vertical-align: sub;
}

.sim-vector-arm { color: #0891b2; }
.sim-vector-force { color: #db2777; }
.sim-text-tension { color: var(--sim-action-blue); }
.sim-text-weight { color: #047857; }
.sim-text-reaction { color: var(--sim-accent-color); }
.sim-text-torque { color: #7c3aed; }

.sim-toggle-sub {
    margin-left: calc(var(--sim-space-lg) + var(--sim-space-xs));
    font-size: 0.9em;
}

.sim-section-divider {
    width: 100%;
    margin: var(--sim-space-sm) 0;
    border: 0;
    border-top: 1px solid var(--sim-border);
}

.sim-graph-card {
    display: flex;
    flex-direction: column;
    gap: var(--sim-space-sm);
    padding: var(--sim-space-md);
    background: var(--sim-bg-panel);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-md);
}

.sim-graph-title {
    color: var(--sim-text-main);
    font-weight: 700;
}

.sim-graph-frame {
    position: relative;
    flex: none;
    width: 100%;
    min-height: 0;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--sim-bg-panel);
    border: 1px solid var(--sim-border);
    border-radius: var(--sim-radius-sm);
}

.sim-graph-frame canvas {
    width: 100%;
    height: 100%;
}

.sim-canvas-theme-dark {
    background: #111827;
    transition: background-color 0.3s ease;
}

.sim-canvas-theme-dark.is-transparent {
    background-color: transparent;
}

.sim-canvas-bg-media {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    z-index: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

/* 背景主體位於原圖右側時，縮窄畫布仍讓視覺焦點留在中央附近。 */
.sim-canvas-bg-focus-right {
    object-position: 65% center;
}

.sim-canvas-bg-media.active {
    opacity: 1;
}

.sim-canvas-layer {
    position: absolute;
    inset: 0;
    z-index: 10;
    cursor: grab;
}

.sim-canvas-layer:active {
    cursor: grabbing;
}

.sim-legend-line-cyan { background-color: #22d3ee; }
.sim-legend-line-pink { background-color: #ec4899; }

/* === HTML Maker 專屬輸入元件 === */
.sim-custom-input {
    flex-grow: 1;
    padding: 8px 12px;
    border: 1px solid var(--sim-border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}
.sim-custom-input:focus {
    border-color: var(--sim-brand-primary);
}

.sim-custom-textarea {
    width: 100%;
    height: 300px;
    padding: 12px;
    border: 1px solid var(--sim-border);
    border-radius: 6px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    resize: vertical;
    outline: none;
    background-color: #fafafa;
    white-space: pre;
    overflow-x: auto;
    color: var(--sim-text-main);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}
.sim-custom-textarea:focus {
    border-color: var(--sim-brand-primary);
    background-color: #ffffff;
}
.sim-custom-textarea::-webkit-scrollbar { width: 8px; height: 8px; }
.sim-custom-textarea::-webkit-scrollbar-track { background: var(--sim-bg-light); border-radius: 4px; }
.sim-custom-textarea::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
.sim-custom-textarea::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

.sim-preview-iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    border: none;
    background-color: #ffffff;
    z-index: 5;
    display: block;
}

/* ==========================================================================
   9. 動力論與特殊元件 (Kinetic Theory Special Components)
   ========================================================================== */

/* 參數鎖定按鈕 */
.sim-lock-btn {
    background: none; 
    border: none; 
    font-size: 1.1rem;
    cursor: pointer; 
    margin-right: 6px; 
    transition: transform 0.2s;
    filter: grayscale(100%); 
    opacity: 0.5;
}
.sim-lock-btn:hover { 
    transform: scale(1.15); 
}
.sim-lock-btn.locked { 
    filter: none; 
    opacity: 1; 
    transform: scale(1.1); 
}

/* 狀態警示框 */
.sim-status-box {
    padding: 10px; 
    border-radius: var(--sim-radius-sm); 
    text-align: center;
    font-weight: 600; 
    font-size: 0.9rem; 
    min-height: 42px;
    display: flex; 
    align-items: center; 
    justify-content: center;
    background-color: var(--sim-bg-light); 
    color: var(--sim-brand-primary);
    border: 1px solid var(--sim-border); 
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}
.sim-status-box.warning { 
    background-color: #FFF7ED; 
    color: #9A3412; 
    border-color: #FFEDD5; 
}
.sim-status-box.danger { 
    background-color: #FEF2F2; 
    color: #B91C1C; 
    border-color: #FECACA; 
}
.sim-status-box.info {
    background-color: #EFF6FF;
    color: #1D4ED8;
    border-color: #BFDBFE;
}
.sim-status-box.success {
    background-color: #F0FDF4;
    color: #166534;
    border-color: #BBF7D0;
}

.sim-visually-hidden-status {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.sim-teaching-feedback {
    width: 100%;
    min-height: 0;
    height: auto;
    flex-shrink: 0;
    align-items: stretch;
    justify-content: flex-start;
    gap: 6px;
    padding: 14px 16px;
    text-align: left;
    line-height: 1.55;
}

.sim-teaching-feedback > strong,
.sim-teaching-feedback > span {
    display: block;
    max-width: 100%;
}

.sim-teaching-feedback > strong {
    line-height: 1.35;
}

.sim-status-reserved {
    height: 72px;
    flex-shrink: 0;
}

.sim-status-reserved.is-empty {
    visibility: hidden;
}

/* ==========================================================================
   11. 使用者偏好與高對比支援 (Accessibility Preferences)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    .sim-app-shell *,
    .sim-app-shell *::before,
    .sim-app-shell *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .sim-btn:active,
    .sim-slider::-webkit-slider-thumb:active {
        transform: none;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .sim-panel,
    .sim-panel-header,
    .sim-watermark,
    .sim-camera-loading {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .sim-panel,
    .sim-panel-header,
    .sim-camera-loading {
        background: #ffffff;
    }
}

@media (prefers-contrast: more) {
    .sim-panel,
    .sim-camera-loading {
        background: #ffffff;
        border-color: #64748b;
    }

    .sim-btn,
    .sim-slider,
    .sim-toggle-track,
    .sim-segmented-control {
        forced-color-adjust: auto;
    }
}

/* ==========================================================================
   13. Spin Clash Lab 多人角動量競技場

   這組元件經專案擁有者核准，以 spin-arena- 前綴隔離。3D 戰場與控制
   面板共用 sim-app-shell、sim-panel、sim-data-item 與 sim-btn 基礎元件。
   ========================================================================== */
.spin-arena-theme {
    --spin-shell: #07131b;
    --spin-panel: rgba(10, 28, 38, 0.92);
    --spin-panel-solid: #0a1c26;
    --spin-surface: rgba(255, 255, 255, 0.055);
    --spin-surface-hover: rgba(255, 255, 255, 0.085);
    --spin-stage-surface: rgba(8, 24, 33, 0.68);
    --spin-overlay: rgba(5, 16, 23, 0.78);
    --spin-text: #edfaff;
    --spin-heading: #efffff;
    --spin-muted: #8fb1bd;
    --spin-muted-soft: #789ba7;
    --spin-border: rgba(168, 236, 239, 0.16);
    --spin-border-strong: rgba(168, 236, 239, 0.28);
    --spin-accent: #36d7ca;
    --spin-accent-hover: #65eee2;
    --spin-accent-ink: #041415;
    --spin-accent-soft: rgba(54, 215, 202, 0.13);
    --spin-accent-border: rgba(99, 238, 226, 0.65);
    --spin-accent-glow: rgba(54, 215, 202, 0.36);
    --spin-secondary: #285c69;
    --spin-reset: #213742;
    --spin-info-text: #a9e6ee;
    --spin-info-bg: rgba(32, 94, 116, 0.24);
    --spin-room-gradient: linear-gradient(135deg, rgba(54, 215, 202, 0.14), rgba(141, 125, 255, 0.08));
    --sim-bg-main: var(--spin-shell);
    --sim-bg-panel: var(--spin-panel);
    --sim-text-main: var(--spin-text);
    --sim-text-muted: var(--spin-muted);
    --sim-border: var(--spin-border);
    --sim-border-light: var(--spin-border-strong);
    --sim-brand-primary: var(--spin-accent);
    --sim-brand-hover: var(--spin-accent-hover);
    --sim-action-blue: var(--spin-accent);
    --sim-action-blue-hover: var(--spin-accent-hover);
    color-scheme: dark;
    background: var(--spin-shell);
}

.spin-arena-theme[data-arena="candy"] {
    --spin-shell: #2b1535;
    --spin-panel: rgba(42, 20, 51, 0.93);
    --spin-panel-solid: #2a1433;
    --spin-stage-surface: rgba(45, 20, 54, 0.72);
    --spin-overlay: rgba(34, 13, 42, 0.8);
    --spin-heading: #fff2fb;
    --spin-muted: #c2a0bf;
    --spin-muted-soft: #b68daf;
    --spin-border: rgba(255, 200, 237, 0.18);
    --spin-border-strong: rgba(255, 200, 237, 0.3);
    --spin-accent: #ff78cc;
    --spin-accent-hover: #ff9fda;
    --spin-accent-ink: #2d0c24;
    --spin-accent-soft: rgba(255, 120, 204, 0.15);
    --spin-accent-border: rgba(255, 159, 218, 0.68);
    --spin-accent-glow: rgba(255, 120, 204, 0.38);
    --spin-secondary: #65436f;
    --spin-reset: #422d49;
    --spin-info-text: #ffd5ee;
    --spin-info-bg: rgba(144, 60, 118, 0.24);
    --spin-room-gradient: linear-gradient(135deg, rgba(255, 120, 204, 0.17), rgba(143, 255, 244, 0.09));
}

.spin-arena-theme[data-arena="ocean"] {
    --spin-shell: #041c2c;
    --spin-panel: rgba(6, 35, 51, 0.93);
    --spin-panel-solid: #062333;
    --spin-stage-surface: rgba(4, 38, 55, 0.72);
    --spin-overlay: rgba(2, 24, 38, 0.8);
    --spin-heading: #effeff;
    --spin-muted: #8ebdcc;
    --spin-muted-soft: #77a8b8;
    --spin-border: rgba(127, 255, 234, 0.17);
    --spin-border-strong: rgba(127, 255, 234, 0.29);
    --spin-accent: #31cfff;
    --spin-accent-hover: #72ddff;
    --spin-accent-ink: #031821;
    --spin-accent-soft: rgba(49, 207, 255, 0.14);
    --spin-accent-border: rgba(95, 225, 255, 0.66);
    --spin-accent-glow: rgba(49, 207, 255, 0.36);
    --spin-secondary: #166b83;
    --spin-reset: #163c4c;
    --spin-info-text: #b4f4ff;
    --spin-info-bg: rgba(28, 115, 143, 0.25);
    --spin-room-gradient: linear-gradient(135deg, rgba(49, 207, 255, 0.16), rgba(127, 255, 234, 0.08));
}

.spin-arena-theme[data-arena="volcano"] {
    --spin-shell: #150706;
    --spin-panel: rgba(37, 13, 10, 0.94);
    --spin-panel-solid: #250d0a;
    --spin-stage-surface: rgba(42, 14, 10, 0.74);
    --spin-overlay: rgba(25, 6, 4, 0.82);
    --spin-heading: #fff1e8;
    --spin-muted: #c09b8b;
    --spin-muted-soft: #ac806f;
    --spin-border: rgba(255, 155, 104, 0.18);
    --spin-border-strong: rgba(255, 155, 104, 0.32);
    --spin-accent: #ff642c;
    --spin-accent-hover: #ff925c;
    --spin-accent-ink: #250804;
    --spin-accent-soft: rgba(255, 83, 29, 0.16);
    --spin-accent-border: rgba(255, 126, 72, 0.72);
    --spin-accent-glow: rgba(255, 83, 29, 0.42);
    --spin-secondary: #783421;
    --spin-reset: #46251d;
    --spin-info-text: #ffd2bd;
    --spin-info-bg: rgba(139, 49, 24, 0.28);
    --spin-room-gradient: linear-gradient(135deg, rgba(255, 83, 29, 0.18), rgba(255, 162, 26, 0.09));
}

.spin-arena-theme[data-arena="forest"] {
    --spin-shell: #06140d;
    --spin-panel: rgba(9, 35, 21, 0.94);
    --spin-panel-solid: #092315;
    --spin-stage-surface: rgba(8, 39, 23, 0.72);
    --spin-overlay: rgba(3, 24, 12, 0.8);
    --spin-heading: #f2fff1;
    --spin-muted: #9fc3a6;
    --spin-muted-soft: #83aa8c;
    --spin-border: rgba(168, 240, 141, 0.17);
    --spin-border-strong: rgba(168, 240, 141, 0.3);
    --spin-accent: #73e88c;
    --spin-accent-hover: #9af2aa;
    --spin-accent-ink: #07170b;
    --spin-accent-soft: rgba(115, 232, 140, 0.14);
    --spin-accent-border: rgba(154, 242, 170, 0.66);
    --spin-accent-glow: rgba(115, 232, 140, 0.36);
    --spin-secondary: #356f48;
    --spin-reset: #294535;
    --spin-info-text: #cef5d3;
    --spin-info-bg: rgba(48, 117, 69, 0.25);
    --spin-room-gradient: linear-gradient(135deg, rgba(115, 232, 140, 0.16), rgba(244, 201, 93, 0.09));
}

.spin-arena-theme[data-arena="ice"] {
    --spin-shell: #081226;
    --spin-panel: rgba(12, 27, 55, 0.94);
    --spin-panel-solid: #0c1b37;
    --spin-stage-surface: rgba(12, 31, 61, 0.72);
    --spin-overlay: rgba(5, 14, 34, 0.8);
    --spin-heading: #f0fbff;
    --spin-muted: #9bafd0;
    --spin-muted-soft: #8399bd;
    --spin-border: rgba(155, 231, 255, 0.18);
    --spin-border-strong: rgba(155, 231, 255, 0.31);
    --spin-accent: #65eaff;
    --spin-accent-hover: #9ff3ff;
    --spin-accent-ink: #061620;
    --spin-accent-soft: rgba(101, 234, 255, 0.14);
    --spin-accent-border: rgba(159, 243, 255, 0.68);
    --spin-accent-glow: rgba(101, 234, 255, 0.38);
    --spin-secondary: #4c5790;
    --spin-reset: #26375a;
    --spin-info-text: #cef8ff;
    --spin-info-bg: rgba(58, 115, 166, 0.25);
    --spin-room-gradient: linear-gradient(135deg, rgba(101, 234, 255, 0.16), rgba(216, 129, 255, 0.1));
}

.spin-arena-theme[data-arena="galaxy"] {
    --spin-shell: #070516;
    --spin-panel: rgba(19, 13, 42, 0.94);
    --spin-panel-solid: #130d2a;
    --spin-stage-surface: rgba(23, 15, 52, 0.74);
    --spin-overlay: rgba(10, 5, 28, 0.82);
    --spin-heading: #f8f0ff;
    --spin-muted: #afa0cc;
    --spin-muted-soft: #9785ba;
    --spin-border: rgba(202, 160, 255, 0.18);
    --spin-border-strong: rgba(202, 160, 255, 0.32);
    --spin-accent: #b067ff;
    --spin-accent-hover: #cc91ff;
    --spin-accent-ink: #170621;
    --spin-accent-soft: rgba(176, 103, 255, 0.16);
    --spin-accent-border: rgba(204, 145, 255, 0.7);
    --spin-accent-glow: rgba(176, 103, 255, 0.42);
    --spin-secondary: #5b4388;
    --spin-reset: #362c54;
    --spin-info-text: #e2cbff;
    --spin-info-bg: rgba(91, 61, 147, 0.28);
    --spin-room-gradient: linear-gradient(135deg, rgba(176, 103, 255, 0.18), rgba(127, 231, 255, 0.09));
}

.spin-arena-theme[data-arena="desert"] {
    --spin-shell: #1a1007;
    --spin-panel: rgba(47, 31, 16, 0.94);
    --spin-panel-solid: #2f1f10;
    --spin-stage-surface: rgba(54, 35, 17, 0.74);
    --spin-overlay: rgba(29, 17, 7, 0.82);
    --spin-heading: #fff5df;
    --spin-muted: #c7ad84;
    --spin-muted-soft: #b49465;
    --spin-border: rgba(244, 201, 107, 0.18);
    --spin-border-strong: rgba(244, 201, 107, 0.32);
    --spin-accent: #f2aa45;
    --spin-accent-hover: #ffc66c;
    --spin-accent-ink: #251604;
    --spin-accent-soft: rgba(242, 170, 69, 0.16);
    --spin-accent-border: rgba(255, 198, 108, 0.7);
    --spin-accent-glow: rgba(242, 170, 69, 0.4);
    --spin-secondary: #41736f;
    --spin-reset: #4a3824;
    --spin-info-text: #ffe2b3;
    --spin-info-bg: rgba(131, 88, 35, 0.28);
    --spin-room-gradient: linear-gradient(135deg, rgba(242, 170, 69, 0.18), rgba(75, 208, 200, 0.09));
}

/* 操作介面以中性石墨與霧銀建立層次；場地主題只留在 3D 舞台與戰鬥資訊。 */
.spin-arena-theme .sim-panel,
.spin-arena-theme .spin-arena-join-card,
.spin-arena-theme .spin-arena-result-overlay {
    --spin-panel: rgba(24, 28, 33, 0.96);
    --spin-panel-solid: #181c21;
    --spin-surface: rgba(225, 231, 239, 0.045);
    --spin-surface-hover: rgba(225, 231, 239, 0.08);
    --spin-stage-surface: rgba(29, 34, 40, 0.86);
    --spin-overlay: rgba(10, 13, 17, 0.82);
    --spin-text: #e1e7ee;
    --spin-heading: #f6f8fb;
    --spin-muted: #adb6c2;
    --spin-muted-soft: #98a4b3;
    --spin-border: rgba(216, 226, 239, 0.1);
    --spin-border-strong: rgba(216, 226, 239, 0.2);
    --spin-accent: #c1d2e2;
    --spin-accent-hover: #e0ebf5;
    --spin-accent-ink: #1a2531;
    --spin-accent-soft: rgba(170, 199, 224, 0.1);
    --spin-accent-border: rgba(193, 216, 237, 0.66);
    --spin-accent-glow: rgba(170, 199, 224, 0.16);
    --spin-secondary: #38434e;
    --spin-reset: #272e36;
    --spin-info-text: #cbd5e0;
    --spin-info-bg: rgba(153, 177, 199, 0.06);
    --spin-room-gradient: linear-gradient(145deg, rgba(154, 181, 207, 0.12), rgba(154, 181, 207, 0.025));
    --sim-bg-panel: var(--spin-panel);
    --sim-text-main: var(--spin-text);
    --sim-text-muted: var(--spin-muted);
    --sim-border: var(--spin-border);
    --sim-border-light: var(--spin-border-strong);
    --sim-brand-primary: var(--spin-accent);
    --sim-brand-hover: var(--spin-accent-hover);
    --sim-action-blue: var(--spin-accent);
    --sim-action-blue-hover: var(--spin-accent-hover);
}

.spin-arena-theme .sim-app-shell {
    background: var(--spin-shell);
}

/* External fallback: this game's CSP intentionally disallows injected styles. */
.spin-arena-theme #sim-page-back {
    position: fixed;
    top: max(12px, env(safe-area-inset-top));
    left: max(12px, env(safe-area-inset-left));
    z-index: 50;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    color: #e6ecf2;
    background: #20262e;
    border: 1px solid rgba(220, 231, 242, 0.18);
    border-radius: 50%;
    cursor: pointer;
}

.spin-arena-theme #sim-page-back svg {
    width: 21px;
    height: 21px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.25;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.spin-arena-theme #sim-page-back:focus-visible {
    outline: 3px solid #d7e2ed;
    outline-offset: 3px;
}

.spin-arena-theme .sim-panel,
.spin-arena-theme .sim-panel-header {
    color: var(--sim-text-main);
    background: var(--spin-panel);
    border-color: var(--sim-border);
}

.spin-arena-theme .sim-panel {
    box-shadow: -12px 0 42px rgba(0, 0, 0, 0.14);
}

/* Existing control rows stay outside the scrollable player panel body. */
.spin-arena-theme #builderActions {
    flex-shrink: 0;
    padding: 12px 18px max(12px, env(safe-area-inset-bottom));
    background: var(--spin-panel);
    border-top: 1px solid var(--sim-border);
}
.spin-arena-theme #builderActions[hidden],
.spin-arena-theme #builderActions button[hidden],
.spin-arena-theme #assemblyStep[hidden],
.spin-arena-theme #launchStep[hidden] { display: none; }
.spin-arena-theme #builderActions .sim-btn { min-height: 44px; margin: 0; }
.spin-arena-theme #builderActions .sim-btn-row { margin: 0; }
.spin-arena-theme #buildSummary { color: var(--sim-text-main); }
.spin-arena-theme #builderControls details { margin-block: 18px; }
.spin-arena-theme #builderControls summary { cursor: pointer; padding-block: 12px; }
.spin-arena-theme #launchStep p { line-height: 1.6; font-size: .85rem; }
.spin-arena-theme .sim-panel.state-collapsed #builderActions { display: none; }

.spin-arena-theme .sim-panel-header {
    padding: 20px 22px 16px;
    box-shadow: 0 8px 18px rgba(14, 17, 21, 0.18);
    flex-shrink: 0;
}

.spin-arena-theme .sim-panel-title-wrapper {
    display: grid;
    gap: 6px;
    min-width: 0;
    padding-bottom: 0;
    border-bottom: 0;
    justify-content: start;
}

.spin-arena-theme .sim-panel-title {
    color: var(--spin-heading);
    font-size: 1.22rem;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.spin-arena-theme .sim-panel-title-wrapper > small {
    color: var(--spin-muted);
    font-size: 0.73rem;
    font-weight: 500;
    line-height: 1.5;
}

.spin-arena-theme .sim-status-box {
    min-height: 46px;
    height: auto;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    line-height: 1.65;
    overflow-wrap: anywhere;
    flex-shrink: 0;
}

.spin-arena-theme .sim-status-box.info {
    color: var(--spin-info-text);
    background: var(--spin-info-bg);
    border-color: var(--spin-border-strong);
}

.spin-arena-theme .sim-status-box.success {
    color: #a5f2d3;
    background: rgba(23, 100, 73, 0.24);
    border-color: rgba(72, 194, 144, 0.32);
}

.spin-arena-theme .sim-status-box.warning {
    color: #ffe2a8;
    background: rgba(121, 75, 18, 0.28);
    border-color: rgba(217, 151, 55, 0.34);
}

.spin-arena-theme .sim-status-box.danger {
    color: #ffc0c0;
    background: rgba(128, 35, 44, 0.26);
    border-color: rgba(231, 91, 104, 0.34);
}

.spin-arena-theme .sim-panel-body {
    padding: 16px 22px 28px;
    gap: 16px;
    scrollbar-color: var(--spin-muted) transparent;
    scrollbar-width: thin;
    scroll-padding-block: 20px;
    overscroll-behavior-y: contain;
}

.spin-arena-theme .sim-panel-body > * {
    flex-shrink: 0;
}

.spin-arena-theme .sim-panel-body > .sim-group-title {
    margin: 12px 0 -3px;
}

.spin-arena-theme .sim-group-title {
    color: var(--spin-heading);
    margin-top: 26px;
    margin-bottom: 12px;
    padding-bottom: 0;
    border: 0;
    font-size: 0.84rem;
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: 0.025em;
}

.spin-arena-theme .sim-data-item {
    color: var(--sim-text-main);
    background: var(--spin-surface);
    border-color: var(--sim-border);
    border-radius: 12px;
}

.spin-arena-theme .sim-slider-val {
    color: var(--spin-accent-hover);
    background: var(--spin-accent-soft);
}

.spin-arena-theme .sim-slider::-webkit-slider-runnable-track {
    background: var(--spin-border-strong);
}

.spin-arena-theme .sim-slider::-moz-range-track {
    background: var(--spin-border-strong);
}

.spin-arena-theme .sim-slider::-webkit-slider-thumb,
.spin-arena-theme .sim-slider::-moz-range-thumb {
    background: var(--spin-heading);
}

.spin-arena-theme .sim-btn-primary {
    color: var(--spin-accent-ink);
    background: var(--spin-accent);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 4px 14px rgba(0, 0, 0, 0.12);
}

.spin-arena-theme .sim-btn-primary:hover {
    background: var(--spin-accent-hover);
}

.spin-arena-theme .sim-btn-primary:disabled {
    color: #8f9ca9;
    background: #303841;
    box-shadow: inset 0 0 0 1px var(--spin-border);
    opacity: 1;
}

.spin-arena-theme .sim-btn-secondary {
    color: var(--spin-heading);
    background: var(--spin-secondary);
}

.spin-arena-theme .sim-btn-reset {
    color: var(--spin-text);
    background: var(--spin-reset);
    box-shadow: inset 0 0 0 1px var(--spin-border);
}

.spin-arena-theme .sim-btn {
    min-height: 48px;
    border-radius: 13px;
    font-size: 0.9rem;
    line-height: 1.4;
    letter-spacing: 0.015em;
}

.spin-arena-theme .sim-btn-secondary:hover,
.spin-arena-theme .sim-btn-reset:hover {
    color: var(--spin-heading);
    background: #424d59;
}

.spin-arena-theme .sim-btn:active {
    transform: scale(0.98);
}

.spin-arena-theme .sim-btn:focus-visible {
    outline-color: var(--spin-accent-hover);
}

.spin-arena-theme .sim-btn-row:has(> .sim-btn):not(:has(> .sim-btn:not([hidden]))) {
    display: none;
}

.spin-arena-theme .sim-segmented-control {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 3px;
    padding: 4px;
    margin-top: 18px;
    background: rgba(9, 13, 18, 0.42);
    border: 1px solid var(--spin-border);
    border-radius: 13px;
}

.spin-arena-theme .sim-segmented-control button[role="radio"] {
    min-height: 44px;
    padding: 8px 4px;
    color: var(--spin-muted);
    font-size: 0.77rem;
    font-weight: 500;
    line-height: 1.3;
    border-radius: 9px;
    touch-action: manipulation;
}

.spin-arena-theme .sim-segmented-control button[role="radio"]:hover,
.spin-arena-theme .sim-segmented-control button[role="radio"]:active {
    color: var(--spin-heading);
    background: var(--spin-surface-hover);
}

.spin-arena-theme .sim-segmented-control button[role="radio"][aria-checked="true"] {
    color: var(--spin-heading);
    background: #3b4653;
    font-weight: 700;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.spin-arena-theme .sim-segmented-control button[role="radio"]:focus-visible {
    outline-color: var(--spin-accent-hover);
    outline-offset: 2px;
}

.spin-arena-entry {
    display: grid;
    min-height: 100dvh;
    padding: clamp(24px, 6vw, 72px);
    place-items: center;
    overflow: auto;
    background:
        linear-gradient(rgba(3, 13, 19, 0.72), rgba(3, 13, 19, 0.9)),
        url('/spin-arena/assets/art/arena-floor.webp') center / min(112vh, 1100px) no-repeat,
        radial-gradient(circle at 18% 18%, rgba(54, 215, 202, 0.2), transparent 34%),
        radial-gradient(circle at 82% 76%, rgba(141, 125, 255, 0.2), transparent 32%),
        #07131b;
}

.spin-arena-entry-card {
    width: min(720px, 100%);
    padding: clamp(28px, 6vw, 64px);
    color: #edfaff;
    background: rgba(13, 35, 46, 0.78);
    border: 1px solid rgba(187, 249, 247, 0.18);
    border-radius: 32px;
    box-shadow: 0 32px 90px rgba(0, 0, 0, 0.42);
    -webkit-backdrop-filter: blur(28px) saturate(140%);
    backdrop-filter: blur(28px) saturate(140%);
}

.spin-arena-entry-card h1 {
    margin: 8px 0 18px;
    font-size: clamp(2.4rem, 8vw, 5rem);
    line-height: 0.98;
    letter-spacing: -0.045em;
}

.spin-arena-entry-card > p:not(.spin-arena-kicker) {
    max-width: 38rem;
    color: #b6d0d8;
    font-size: clamp(1rem, 2.4vw, 1.2rem);
    line-height: 1.75;
}

.spin-arena-entry-card > small {
    display: block;
    margin-top: 22px;
    color: #799ba7;
    line-height: 1.6;
}

.spin-arena-kicker {
    color: var(--spin-accent-hover);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.19em;
}

.spin-arena-entry-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin: 30px 0;
}

.spin-arena-entry-actions .sim-btn {
    min-height: 52px;
    text-decoration: none;
}

.spin-arena-entry-facts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.spin-arena-entry-facts div {
    padding: 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
}

.spin-arena-entry-facts dt {
    color: #789aa7;
    font-size: 0.72rem;
}

.spin-arena-entry-facts dd {
    margin-top: 5px;
    color: #efffff;
    font-size: 1rem;
    font-weight: 700;
}

.spin-arena-renderer {
    position: absolute;
    inset: 0;
}

.spin-arena-renderer canvas {
    width: 100%;
    height: 100%;
}

.spin-arena-stage-header {
    position: absolute;
    top: max(18px, env(safe-area-inset-top));
    right: max(18px, env(safe-area-inset-right));
    left: max(72px, calc(env(safe-area-inset-left) + 72px));
    z-index: 12;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    pointer-events: none;
}

.spin-arena-stage-header > div:first-child {
    display: grid;
    gap: 6px;
    min-width: 0;
}

.spin-arena-stage-header > div:first-child > strong {
    color: var(--spin-heading);
    font-size: clamp(1rem, 2.2vw, 1.5rem);
    line-height: 1.25;
    letter-spacing: -0.02em;
    text-shadow: 0 3px 18px rgba(0, 0, 0, 0.55);
}

.spin-arena-stage-header > div:first-child > small {
    max-width: 30rem;
    color: #becbd3;
    font-size: 0.72rem;
    line-height: 1.6;
    letter-spacing: 0.015em;
}

.spin-arena-stage-phase {
    min-width: 96px;
    padding: 10px 14px;
    flex-shrink: 0;
    text-align: right;
    background: var(--spin-stage-surface);
    border: 1px solid var(--spin-border);
    border-radius: 16px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.12);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    backdrop-filter: blur(18px) saturate(140%);
}

.spin-arena-stage-phase span,
.spin-arena-stage-phase strong {
    display: block;
}

.spin-arena-stage-phase span {
    color: var(--spin-muted-soft);
    font-size: 0.7rem;
}

.spin-arena-stage-phase strong {
    margin-top: 4px;
    color: var(--spin-heading);
    font-size: 0.88rem;
}

.spin-arena-battle-hud {
    position: absolute;
    bottom: max(42px, calc(env(safe-area-inset-bottom) + 32px));
    left: 50%;
    z-index: 14;
    display: grid;
    width: min(760px, calc(100% - 32px));
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    transform: translateX(-50%);
    pointer-events: none;
}

.spin-arena-hud-card {
    display: grid;
    grid-template-columns: 9px 1fr auto;
    gap: 10px;
    align-items: center;
    min-width: 0;
    padding: 12px 14px;
    color: var(--spin-heading);
    background: var(--spin-stage-surface);
    border: 1px solid var(--spin-border);
    border-radius: 16px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.16);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    backdrop-filter: blur(16px) saturate(140%);
}

.spin-arena-hud-card > span,
.spin-arena-player-row > span,
.spin-arena-identity > span {
    width: 9px;
    height: 28px;
    background: #31d3c5;
    border-radius: 999px;
    box-shadow: 0 0 10px rgba(49, 211, 197, 0.2);
}

.spin-arena-hud-card[data-color="1"] > span,
.spin-arena-player-row[data-color="1"] > span,
.spin-arena-identity > span[data-color="1"] { background: #ff6b6b; box-shadow: 0 0 10px rgba(255, 107, 107, 0.2); }
.spin-arena-hud-card[data-color="2"] > span,
.spin-arena-player-row[data-color="2"] > span,
.spin-arena-identity > span[data-color="2"] { background: #ffc857; box-shadow: 0 0 10px rgba(255, 200, 87, 0.2); }
.spin-arena-hud-card[data-color="3"] > span,
.spin-arena-player-row[data-color="3"] > span,
.spin-arena-identity > span[data-color="3"] { background: #8d7dff; box-shadow: 0 0 10px rgba(141, 125, 255, 0.2); }

.spin-arena-hud-card div {
    min-width: 0;
}

.spin-arena-hud-card strong,
.spin-arena-hud-card small {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.spin-arena-hud-card small {
    margin-top: 4px;
    color: var(--spin-muted);
    font-size: 0.72rem;
}

.spin-arena-hud-card em {
    color: var(--spin-accent-hover);
    font-size: 0.72rem;
    font-style: normal;
    font-variant-numeric: tabular-nums;
}

.spin-arena-countdown {
    position: absolute;
    inset: 0;
    z-index: 40;
    display: grid;
    align-content: center;
    justify-items: center;
    color: var(--spin-heading);
    background: var(--spin-overlay);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.spin-arena-countdown span {
    color: var(--spin-accent-hover);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.spin-arena-countdown strong {
    font-size: clamp(5rem, 22vw, 12rem);
    line-height: 0.9;
    letter-spacing: -0.07em;
    text-shadow: 0 0 54px var(--spin-accent-glow);
    animation: spin-arena-countdown-pulse 700ms cubic-bezier(0.2, 0.9, 0.2, 1) infinite alternate;
}

@keyframes spin-arena-countdown-pulse {
    from { opacity: 0.78; transform: scale(0.92); }
    to { opacity: 1; transform: scale(1); }
}

.spin-arena-impact-callout {
    position: absolute;
    top: 22%;
    left: 50%;
    z-index: 30;
    display: grid;
    justify-items: center;
    width: max-content;
    max-width: calc(100% - 32px);
    padding: 12px 22px 14px;
    color: #efffff;
    text-align: center;
    background: linear-gradient(135deg, rgba(255, 87, 72, 0.94), rgba(255, 169, 62, 0.88));
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 999px;
    box-shadow: 0 12px 48px rgba(255, 92, 65, 0.36);
    transform: translateX(-50%);
    pointer-events: none;
    animation: spin-arena-impact-pop 720ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.spin-arena-impact-callout[hidden] {
    display: none;
}

.spin-arena-impact-callout strong {
    font-size: clamp(1.55rem, 5vw, 2.7rem);
    line-height: 1;
    letter-spacing: 0.04em;
}

.spin-arena-impact-callout span {
    margin-top: 4px;
    font-size: 0.72rem;
    font-weight: 700;
}

.spin-arena-impact-callout[data-mode="knockout"] {
    top: 28%;
    padding: 18px 34px 20px;
    background: linear-gradient(135deg, rgba(255, 45, 87, 0.96), rgba(141, 56, 255, 0.92));
    box-shadow: 0 18px 62px rgba(255, 45, 87, 0.48);
}

@keyframes spin-arena-impact-pop {
    0% { opacity: 0; transform: translateX(-50%) scale(0.58); }
    24% { opacity: 1; transform: translateX(-50%) scale(1.12); }
    100% { opacity: 1; transform: translateX(-50%) scale(1); }
}

.spin-arena-result-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 32;
    width: min(560px, calc(100% - 34px));
    max-height: min(72vh, 680px);
    padding: clamp(22px, 5vw, 38px);
    overflow: auto;
    color: var(--spin-heading);
    background: var(--spin-panel);
    border: 1px solid var(--spin-border-strong);
    border-radius: 28px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.045);
    transform: translate(-50%, -50%);
    -webkit-backdrop-filter: blur(28px) saturate(150%);
    backdrop-filter: blur(28px) saturate(150%);
}

.spin-arena-result-overlay h2 {
    margin: 6px 0 18px;
    font-size: clamp(1.7rem, 6vw, 2.8rem);
    line-height: 1.2;
    letter-spacing: -0.035em;
}

.spin-arena-result-overlay > strong {
    display: block;
    margin: 10px 0 16px;
    color: var(--spin-accent-hover);
    font-size: clamp(2.5rem, 12vw, 5rem);
    letter-spacing: -0.05em;
}

.spin-arena-result-overlay ol {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
    list-style: none;
}

.spin-arena-result-overlay li {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 3px 10px;
    align-items: center;
    padding: 14px 16px;
    background: var(--spin-surface);
    border-radius: 12px;
}

.spin-arena-result-overlay li > span {
    grid-row: span 2;
    color: var(--spin-accent);
    font-size: 1.25rem;
    font-weight: 700;
}

.spin-arena-result-overlay li small {
    color: var(--spin-muted);
    font-size: 0.76rem;
    line-height: 1.5;
}

.spin-arena-result-overlay > p:last-child {
    color: var(--spin-text);
    line-height: 1.72;
}

.spin-arena-room-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 104px;
    gap: 16px;
    align-items: center;
    padding: 18px;
    background: var(--spin-room-gradient);
    border: 1px solid var(--spin-border);
    border-radius: 20px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.spin-arena-room-card div {
    min-width: 0;
}

.spin-arena-room-card span,
.spin-arena-room-card strong,
.spin-arena-room-card small {
    display: block;
}

.spin-arena-room-card span {
    color: var(--spin-muted);
    font-size: 0.74rem;
    letter-spacing: 0.04em;
}

.spin-arena-room-card strong {
    margin: 6px 0 9px;
    color: var(--spin-heading);
    font-size: clamp(1.65rem, 2.4vw, 2rem);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
    letter-spacing: 0.06em;
}

.spin-arena-room-card small {
    overflow: hidden;
    color: var(--spin-muted);
    font-size: 0.7rem;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.spin-arena-room-card img {
    display: block;
    width: 104px;
    height: 104px;
    padding: 7px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 16px rgba(0, 0, 0, 0.15);
}

#hostArenaDescription {
    display: grid;
    flex: 0 0 auto;
    min-height: auto;
    padding: 12px 14px;
    gap: 7px;
    text-align: left;
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1.65;
    overflow-wrap: anywhere;
}

#hostArenaDescription > strong,
#hostArenaDescription > span,
#hostArenaDescription > small {
    display: block;
    min-width: 0;
}

#hostArenaDescription > strong {
    color: var(--spin-heading);
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1.35;
}

#hostArenaDescription > span {
    color: var(--spin-text);
}

#hostArenaDescription > small {
    color: var(--spin-muted);
    font-size: 0.72rem;
}

.spin-arena-stat-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.spin-arena-stat-grid .sim-data-item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
        "label label"
        "value unit";
    gap: 6px 7px;
    align-content: center;
    align-items: baseline;
    min-width: 0;
    min-height: 86px;
    padding: 14px 12px;
    border: 1px solid var(--spin-border);
}

.spin-arena-stat-grid .sim-data-item > span {
    grid-area: label;
    color: var(--spin-muted);
    font-size: 0.72rem;
    font-weight: 600;
    line-height: 1.25;
    white-space: nowrap;
}

.spin-arena-stat-grid .sim-data-item strong {
    grid-area: value;
    color: var(--spin-heading);
    font-size: 1.4rem;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.spin-arena-stat-grid .sim-data-item > small {
    grid-area: unit;
    align-self: end;
    color: var(--spin-muted);
    font-size: 0.68rem;
    line-height: 1;
}

.spin-arena-stat-grid-wide {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.spin-arena-roster {
    display: grid;
    gap: 7px;
}

.spin-arena-player-row {
    display: grid;
    grid-template-columns: 8px minmax(0, 1fr) auto;
    gap: 10px;
    align-items: center;
    padding: 12px 14px;
    background: var(--spin-surface);
    border: 1px solid var(--spin-border);
    border-radius: 12px;
}

.spin-arena-player-row > span {
    width: 8px;
    height: 30px;
}

.spin-arena-player-row div {
    min-width: 0;
}

.spin-arena-player-row strong,
.spin-arena-player-row small {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.spin-arena-player-row small {
    margin-top: 4px;
    color: var(--spin-muted);
    font-size: 0.72rem;
}

.spin-arena-player-row em {
    color: var(--spin-accent-hover);
    font-size: 0.7rem;
    font-style: normal;
}

.spin-arena-client-stage {
    background: var(--spin-shell);
}

.spin-arena-client-stage > canvas {
    cursor: grab;
    touch-action: none;
    user-select: none;
}

.spin-arena-client-stage > canvas:active {
    cursor: grabbing;
}

.spin-arena-client-stage > canvas:focus-visible {
    outline: 3px solid var(--spin-heading);
    outline-offset: -6px;
}

.spin-arena-join-overlay {
    position: absolute;
    inset: 0;
    z-index: 24;
    display: grid;
    padding: max(76px, 8vh) 18px 24px;
    place-items: center;
    overflow: auto;
    background:
        radial-gradient(circle at 18% 22%, var(--spin-accent-soft), transparent 34%),
        var(--spin-overlay);
}

.spin-arena-join-card {
    width: min(460px, 100%);
    padding: clamp(22px, 5vw, 36px);
    color: var(--spin-heading);
    background: var(--spin-panel);
    border: 1px solid var(--spin-border-strong);
    border-radius: 26px;
    box-shadow: 0 24px 72px rgba(0, 0, 0, 0.34), inset 0 1px 0 rgba(255, 255, 255, 0.04);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    backdrop-filter: blur(24px) saturate(140%);
}

.spin-arena-join-card h1 {
    margin: 6px 0 10px;
    font-size: clamp(1.8rem, 7vw, 2.6rem);
    line-height: 1.2;
    letter-spacing: -0.035em;
}

.spin-arena-join-card > p:not(.spin-arena-kicker) {
    margin-bottom: 20px;
    color: var(--spin-muted);
    line-height: 1.65;
}

.spin-arena-field {
    display: grid;
    gap: 8px;
    margin-bottom: 18px;
    color: var(--spin-text);
    font-size: 0.82rem;
    font-weight: 600;
}

.spin-arena-theme .sim-custom-input {
    color: var(--spin-heading);
    background: var(--spin-overlay);
    border-color: var(--spin-border-strong);
    min-height: 48px;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 1rem;
    line-height: 1.4;
}

.spin-arena-theme .sim-custom-input:focus {
    border-color: var(--spin-accent);
    box-shadow: 0 0 0 3px var(--spin-accent-soft);
}

.spin-arena-identity {
    display: grid;
    grid-template-columns: 10px 1fr;
    gap: 11px;
    align-items: center;
    padding: 14px 16px;
    background: var(--spin-surface);
    border: 1px solid var(--spin-border);
    border-radius: 16px;
    margin-bottom: 12px;
}

.spin-arena-identity > span {
    width: 10px;
    height: 34px;
}

.spin-arena-identity small,
.spin-arena-identity strong {
    display: block;
}

.spin-arena-identity small {
    color: var(--spin-muted);
    margin-bottom: 3px;
    font-size: 0.72rem;
}

.spin-arena-part-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.spin-arena-part-card {
    position: relative;
    display: grid;
    min-width: 0;
    min-height: 132px;
    padding: 14px;
    align-content: start;
    color: var(--spin-text);
    text-align: left;
    background: var(--spin-surface);
    border: 1px solid var(--spin-border);
    border-radius: 16px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.025);
    cursor: pointer;
    transform: scale(1);
    transform-origin: center;
    transition:
        background-color 180ms ease-out,
        border-color 180ms ease-out,
        box-shadow 180ms ease-out,
        transform 160ms ease-out;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.spin-arena-part-card:not(:disabled):hover {
    background: var(--spin-surface-hover);
    border-color: var(--spin-border-strong);
}

.spin-arena-part-card.spin-arena-is-pressed {
    transform: scale(0.98);
    transition-duration: 90ms;
}

.spin-arena-part-card:focus-visible {
    z-index: 1;
    outline: 3px solid var(--spin-heading);
    outline-offset: 3px;
}

.spin-arena-part-card:disabled {
    cursor: not-allowed;
    opacity: 0.54;
}

.spin-arena-part-card:disabled[aria-pressed="true"] {
    opacity: 0.82;
}

.spin-arena-part-card[aria-pressed="true"] {
    color: var(--spin-heading);
    background: var(--spin-accent-soft);
    border-color: var(--spin-accent-border);
    box-shadow: inset 0 0 0 1px rgba(193, 216, 237, 0.15), 0 5px 18px rgba(0, 0, 0, 0.12);
}

.spin-arena-part-card[aria-pressed="true"]::after {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 3px 7px;
    color: var(--spin-accent-ink);
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    content: "已選";
    background: var(--spin-accent-hover);
    border-radius: 999px;
}

.spin-arena-part-card strong,
.spin-arena-part-card small,
.spin-arena-part-card span {
    display: block;
}

.spin-arena-part-card strong {
    padding-right: 27px;
    font-size: 0.88rem;
    font-weight: 700;
    line-height: 1.45;
    overflow-wrap: anywhere;
}

.spin-arena-part-card small {
    margin-top: 6px;
    color: var(--spin-muted);
    font-size: 0.74rem;
    line-height: 1.6;
    overflow-wrap: anywhere;
}

.spin-arena-part-card span {
    align-self: end;
    margin-top: 10px;
    color: var(--spin-muted);
    font-size: 0.7rem;
    font-weight: 600;
}

.spin-arena-part-card--art {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: 118px 1fr;
    gap: 10px;
    align-items: start;
    min-height: 244px;
    padding: 12px 14px 14px;
    background: radial-gradient(ellipse at 50% 18%, rgba(178, 195, 216, 0.055), transparent 65%), var(--spin-surface);
}

.spin-arena-part-card--art > img {
    display: block;
    width: 100%;
    height: 118px;
    padding: 4px 8px;
    object-fit: contain;
    pointer-events: none;
    filter: drop-shadow(0 7px 9px rgba(0, 0, 0, 0.28));
    transition: transform 180ms ease-out, filter 180ms ease-out;
}

.spin-arena-part-card--art > div {
    display: grid;
    align-self: stretch;
    min-width: 0;
    grid-template-rows: auto 1fr auto;
}

.spin-arena-part-card--art strong {
    padding-right: 0;
}

.spin-arena-part-card--art:not(:disabled):hover > img,
.spin-arena-part-card--art[aria-pressed="true"] > img {
    filter: drop-shadow(0 8px 12px rgba(185, 204, 222, 0.12));
    transform: translateY(-2px) scale(1.03);
}

.spin-arena-index-bars {
    display: grid;
    gap: 12px;
    padding: 16px;
    margin-top: 14px;
    margin-bottom: 14px;
    background: var(--spin-surface);
    border: 1px solid var(--spin-border);
    border-radius: 14px;
}

.spin-arena-index-bars label {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 10px;
    align-items: center;
    color: var(--spin-muted);
    font-size: 0.75rem;
}

.spin-arena-index-bars meter {
    width: 100%;
    height: 9px;
    accent-color: var(--spin-accent);
}

@media (min-width: 769px) {
    .spin-arena-theme .sim-panel {
        width: clamp(360px, 30vw, 420px);
        flex-shrink: 0;
    }
}

@media (max-width: 768px) {
    .spin-arena-theme .sim-panel:has(#builderControls).state-half {
        height: 55dvh;
    }
    .spin-arena-theme .sim-panel:has(#builderControls).state-full {
        height: 65dvh;
    }
    .spin-arena-theme .sim-panel:has(#builderControls) .sim-panel-header {
        padding: 10px 16px;
    }
    .spin-arena-theme #builderControls .spin-arena-identity { display: none; }
    .spin-arena-theme #buildStepTitle { margin-block: 0 10px; }
    .spin-arena-theme #assemblyStep .spin-arena-part-grid { grid-template-columns: minmax(0, 1fr); }
    .spin-arena-theme #assemblyStep .spin-arena-part-card--art {
        grid-template-columns: 76px minmax(0, 1fr);
        min-height: 108px;
        padding: 12px;
        gap: 12px;
    }
    .spin-arena-theme #assemblyStep .spin-arena-part-card--art > img { width: 76px; height: 76px; }
    .spin-arena-theme #assemblyStep .spin-arena-part-card--art > div { gap: 4px; padding-top: 0; }
    .spin-arena-theme #assemblyStep .spin-arena-part-card--art strong { padding-right: 36px; }
    .spin-arena-theme #partCategories { position: sticky; top: 0; z-index: 2; background: var(--spin-panel); }

    .spin-arena-theme .spin-arena-identity {
        padding: 8px 12px;
        margin-bottom: 8px;
    }

    .spin-arena-theme .spin-arena-identity > span {
        height: 20px;
    }

    .spin-arena-theme .spin-arena-identity > div {
        display: flex;
        align-items: baseline;
        gap: 8px;
    }

    .spin-arena-theme .spin-arena-identity small {
        margin-bottom: 0;
    }

    .spin-arena-theme #partCategories {
        margin-block: 10px 12px;
    }

    .spin-arena-theme #ringPartsTitle,
    .spin-arena-theme #weightPartsTitle,
    .spin-arena-theme #shaftPartsTitle,
    .spin-arena-theme #tipPartsTitle {
        display: none;
    }

    .spin-arena-theme .sim-panel-header {
        padding: 16px 18px 12px;
    }

    .spin-arena-theme .sim-panel-body {
        padding: 12px 16px max(24px, env(safe-area-inset-bottom));
    }

    .spin-arena-theme .sim-panel.state-collapsed .sim-panel-header {
        padding-block: 9px;
    }

    .spin-arena-theme .sim-panel.state-collapsed .sim-panel-title-wrapper {
        gap: 1px;
    }

    .spin-arena-theme .sim-panel.state-collapsed .sim-panel-title {
        font-size: 1rem;
    }

    .spin-arena-theme .sim-panel.state-collapsed .sim-panel-title-wrapper > small {
        font-size: 0.65rem;
        line-height: 1.25;
    }

    .spin-arena-stage-header {
        right: 14px;
        left: 66px;
        gap: 10px;
    }

    .spin-arena-stage-header .spin-arena-kicker {
        display: none;
    }

    .spin-arena-battle-hud {
        bottom: 18px;
        grid-template-columns: 1fr;
    }

    .spin-arena-hud-card:nth-child(n + 3) {
        display: none;
    }

    .spin-arena-entry-actions,
    .spin-arena-entry-facts {
        grid-template-columns: 1fr;
    }

    .spin-arena-result-overlay {
        top: 46%;
        max-height: 64vh;
    }
}

@media (max-width: 420px) {
    .spin-arena-part-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .spin-arena-part-card {
        padding: 12px;
    }

    .spin-arena-part-card--art {
        grid-template-rows: 108px 1fr;
        min-height: 232px;
    }

    .spin-arena-part-card--art > img {
        height: 108px;
        padding: 4px;
    }

    .spin-arena-part-card small {
        font-size: 0.73rem;
    }

    .spin-arena-stage-phase {
        min-width: 80px;
        padding: 9px 11px;
    }

    .spin-arena-stage-header > div:first-child > small {
        font-size: 0.65rem;
        line-height: 1.5;
    }

    .spin-arena-room-card {
        grid-template-columns: minmax(0, 1fr) 86px;
        padding: 16px;
    }

    .spin-arena-room-card img {
        width: 86px;
        height: 86px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .spin-arena-part-card,
    .spin-arena-part-card--art > img,
    .spin-arena-countdown strong,
    .spin-arena-impact-callout {
        animation: none;
        transition-duration: 0.01ms;
    }

    .spin-arena-part-card--art:not(:disabled):hover > img,
    .spin-arena-part-card--art[aria-pressed="true"] > img {
        transform: none;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .spin-arena-entry-card,
    .spin-arena-stage-phase,
    .spin-arena-hud-card,
    .spin-arena-result-overlay,
    .spin-arena-join-card,
    .spin-arena-theme .sim-panel,
    .spin-arena-theme .sim-panel-header {
        background: var(--spin-panel-solid);
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }
}

@media (prefers-contrast: more) {
    .spin-arena-entry-card,
    .spin-arena-result-overlay,
    .spin-arena-join-card,
    .spin-arena-part-card,
    .spin-arena-theme .sim-panel {
        border-color: var(--spin-accent-hover);
    }

    .spin-arena-part-card:focus-visible {
        outline-color: #ffffff;
        outline-width: 4px;
    }
}

/* 動態公式顯示 */
.sim-formula-display {
    font-size: 1.6rem; 
    font-weight: bold; 
    text-align: center; 
    color: var(--sim-brand-primary);
    font-family: 'Times New Roman', Times, serif; 
    font-style: italic; 
    margin: 5px 0 10px 0;
}
.sim-formula-display span { 
    display: inline-block; 
    transition:
        color 150ms ease-out,
        transform 150ms ease-out,
        text-shadow 150ms ease-out;
}
.sim-formula-display span.active {
    color: var(--sim-action-blue); 
    transform: scale(1.35); 
    text-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

/* ==========================================================================
   10. 抽籤與娃娃機專屬元件 (Picker & Claw Machine Components)
   ========================================================================== */

.sim-picker-hidden {
    display: none !important;
}

.sim-picker-bg-primary {
    background-color: var(--sim-brand-primary);
}

.sim-picker-text-primary {
    color: var(--sim-brand-primary);
}

.sim-picker-border-primary {
    border-color: var(--sim-brand-primary);
}

.sim-picker-machine-shape {
    transition: border-radius 0.5s ease-in-out;
}

/* 搖桿動作 */
.sim-joystick-active {
    transform: rotate(-15deg);
}

/* 彈跳出現動畫 */
@keyframes sim-anim-bounce-in {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.05); opacity: 1; }
    70% { transform: scale(0.9); }
    100% { transform: scale(1); opacity: 1; }
}
.sim-anim-bounce-in {
    animation: sim-anim-bounce-in 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* 彈出視窗動畫 */
@keyframes sim-anim-pop-up {
    0% { transform: scale(0.8) translateY(20px); opacity: 0; }
    100% { transform: scale(1) translateY(0); opacity: 1; }
}
.sim-anim-pop-up {
    animation: sim-anim-pop-up 0.4s ease-out forwards;
}

/* ==========================================================================
   12. 深色模式：外框與控制面板（第二階段）

   data-theme 是正式介面；data-resolved-theme 保留給主題控制器相容使用。
   這裡只調整應用外框與 HTML 控制元件，不對 Canvas 使用 filter / invert。
   一般繪圖區、圖表畫布與 HTML 預覽固定使用淺色；原本明確標成
   .sim-canvas-theme-dark 的場景則維持模擬器自己的既有設計。
   ========================================================================== */
html[data-theme="dark"],
html[data-resolved-theme="dark"] {
    color-scheme: dark;

    --sim-brand-primary: #ACC19E;
    --sim-brand-hover: #C1D1B6;
    --sim-action-blue: #60A5FA;
    --sim-action-blue-hover: #93C5FD;

    --sim-bg-main: #0F110F;
    --sim-bg-light: #171A17;
    --sim-bg-panel: rgba(25, 28, 25, 0.95);

    --sim-text-main: #F0F3EF;
    --sim-text-muted: #AEB6AE;
    --sim-border: rgba(224, 231, 222, 0.16);
    --sim-border-light: #3A403A;
    --sim-warning-amber: #FBBF24;
    --sim-danger-red: #FB7185;

    --sim-shadow-panel: 0 -8px 30px rgba(0, 0, 0, 0.42);
    --sim-shadow-overlay: 0 12px 30px rgba(0, 0, 0, 0.48);
}

html[data-theme="dark"] .sim-panel,
html[data-theme="dark"] .sim-panel-header,
html[data-resolved-theme="dark"] .sim-panel,
html[data-resolved-theme="dark"] .sim-panel-header {
    background: var(--sim-bg-panel);
}

html[data-theme="dark"] .sim-panel,
html[data-resolved-theme="dark"] .sim-panel {
    accent-color: #7F966E;
    border-color: var(--sim-border);
}

html[data-theme="dark"] .sim-toggle,
html[data-resolved-theme="dark"] .sim-toggle {
    border-bottom-color: rgba(240, 243, 239, 0.1);
}

html[data-theme="dark"] .sim-toggle:hover,
html[data-resolved-theme="dark"] .sim-toggle:hover {
    background: rgba(255, 255, 255, 0.055);
}

html[data-theme="dark"] .sim-slider-val,
html[data-resolved-theme="dark"] .sim-slider-val {
    color: #93C5FD;
    background: rgba(59, 130, 246, 0.16);
}

html[data-theme="dark"] .sim-slider::-webkit-slider-runnable-track,
html[data-resolved-theme="dark"] .sim-slider::-webkit-slider-runnable-track {
    background: rgba(240, 243, 239, 0.17);
}

html[data-theme="dark"] .sim-slider::-moz-range-track,
html[data-resolved-theme="dark"] .sim-slider::-moz-range-track {
    height: 8px;
    background: rgba(240, 243, 239, 0.17);
    border: 0;
    border-radius: 4px;
}

html[data-theme="dark"] .sim-slider::-webkit-slider-thumb,
html[data-resolved-theme="dark"] .sim-slider::-webkit-slider-thumb,
html[data-theme="dark"] .sim-slider::-moz-range-thumb,
html[data-resolved-theme="dark"] .sim-slider::-moz-range-thumb {
    background: #F8FAFC;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.52);
}

html[data-theme="dark"] .sim-toggle-track,
html[data-resolved-theme="dark"] .sim-toggle-track {
    background: #475569;
}

html[data-theme="dark"] .sim-toggle-input:checked + .sim-toggle-track,
html[data-resolved-theme="dark"] .sim-toggle-input:checked + .sim-toggle-track {
    background: #7F966E;
}

html[data-theme="dark"] .sim-multiselect-menu,
html[data-theme="dark"] .sim-btn.sim-multiselect-trigger,
html[data-resolved-theme="dark"] .sim-multiselect-menu,
html[data-resolved-theme="dark"] .sim-btn.sim-multiselect-trigger {
    color: var(--sim-text-main);
    background: #1B1F1B;
    border-color: var(--sim-border-light);
}

html[data-theme="dark"] .sim-btn.sim-multiselect-trigger:hover,
html[data-resolved-theme="dark"] .sim-btn.sim-multiselect-trigger:hover {
    background: #252A25;
}

html[data-theme="dark"] .sim-btn-primary,
html[data-resolved-theme="dark"] .sim-btn-primary {
    color: #FFFFFF;
    background: #627853;
}

html[data-theme="dark"] .sim-btn-primary:hover,
html[data-resolved-theme="dark"] .sim-btn-primary:hover {
    background: #768B67;
}

html[data-theme="dark"] .sim-btn-secondary,
html[data-resolved-theme="dark"] .sim-btn-secondary {
    color: #FFFFFF;
    background: #536746;
}

html[data-theme="dark"] .sim-btn-secondary:hover,
html[data-resolved-theme="dark"] .sim-btn-secondary:hover {
    background: #687E58;
}

html[data-theme="dark"] .sim-btn-reset,
html[data-resolved-theme="dark"] .sim-btn-reset {
    color: #E2E8F0;
    background: #334155;
}

html[data-theme="dark"] .sim-btn-reset:hover,
html[data-resolved-theme="dark"] .sim-btn-reset:hover {
    color: #F8FAFC;
    background: #475569;
}

html[data-theme="dark"] .sim-btn-danger,
html[data-resolved-theme="dark"] .sim-btn-danger {
    color: #FFFFFF;
    background: #B91C1C;
}

html[data-theme="dark"] .sim-btn-danger:hover,
html[data-resolved-theme="dark"] .sim-btn-danger:hover {
    background: #991B1B;
}

html[data-theme="dark"] .sim-btn-orange,
html[data-resolved-theme="dark"] .sim-btn-orange {
    color: #FFFFFF;
    background: #B45309;
}

html[data-theme="dark"] .sim-btn-orange:hover,
html[data-resolved-theme="dark"] .sim-btn-orange:hover {
    background: #92400E;
}

html[data-theme="dark"] .sim-picker-bg-primary,
html[data-resolved-theme="dark"] .sim-picker-bg-primary {
    background-color: #627853;
}

html[data-theme="dark"] .sim-segmented-control,
html[data-resolved-theme="dark"] .sim-segmented-control {
    background: #121412;
    border: 1px solid var(--sim-border);
}

html[data-theme="dark"] .sim-segmented-control input[type="radio"]:checked + label,
html[data-resolved-theme="dark"] .sim-segmented-control input[type="radio"]:checked + label {
    color: var(--sim-text-main);
    background: #2A2F2A;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.42);
}

html[data-theme="dark"] .sim-segmented-control-emphasis input[type="radio"]:checked + label,
html[data-resolved-theme="dark"] .sim-segmented-control-emphasis input[type="radio"]:checked + label {
    color: #FFFFFF;
    background: #627853;
}

html[data-theme="dark"] .sim-hint-card,
html[data-resolved-theme="dark"] .sim-hint-card {
    color: var(--sim-text-muted);
    background: rgba(255, 255, 255, 0.045);
}

html[data-theme="dark"] .sim-camera-loading,
html[data-resolved-theme="dark"] .sim-camera-loading {
    color: var(--sim-brand-primary);
    background: rgba(25, 28, 25, 0.96);
    border-color: var(--sim-border-light);
}

html[data-theme="dark"] .sim-unit-toolbox::-webkit-scrollbar-track,
html[data-resolved-theme="dark"] .sim-unit-toolbox::-webkit-scrollbar-track {
    background: #171A17;
}

html[data-theme="dark"] .sim-unit-toolbox::-webkit-scrollbar-thumb,
html[data-resolved-theme="dark"] .sim-unit-toolbox::-webkit-scrollbar-thumb {
    background: #555D55;
}

html[data-theme="dark"] .sim-force-item:hover,
html[data-resolved-theme="dark"] .sim-force-item:hover {
    box-shadow: 0 5px 14px rgba(0, 0, 0, 0.34);
}

html[data-theme="dark"] .sim-direction-badge.positive,
html[data-resolved-theme="dark"] .sim-direction-badge.positive {
    color: #A7F3D0;
    background: #153D31;
    border-color: #27745A;
}

html[data-theme="dark"] .sim-direction-badge.negative,
html[data-resolved-theme="dark"] .sim-direction-badge.negative {
    color: #FDA4AF;
    background: #431D28;
    border-color: #8B3B50;
}

html[data-theme="dark"] .sim-panel :where(input[type="text"], input[type="number"], input[type="search"], input[type="url"], select, textarea),
html[data-theme="dark"] .sim-custom-input,
html[data-theme="dark"] .sim-custom-textarea,
html[data-theme="dark"] .sim-free-body-select,
html[data-resolved-theme="dark"] .sim-panel :where(input[type="text"], input[type="number"], input[type="search"], input[type="url"], select, textarea),
html[data-resolved-theme="dark"] .sim-custom-input,
html[data-resolved-theme="dark"] .sim-custom-textarea,
html[data-resolved-theme="dark"] .sim-free-body-select {
    color: var(--sim-text-main);
    background: #121412;
    border-color: var(--sim-border-light);
}

html[data-theme="dark"] .sim-panel :where(input, textarea)::placeholder,
html[data-resolved-theme="dark"] .sim-panel :where(input, textarea)::placeholder {
    color: #8E978E;
}

html[data-theme="dark"] .sim-custom-textarea:focus,
html[data-resolved-theme="dark"] .sim-custom-textarea:focus {
    background: #181B18;
}

html[data-theme="dark"] .sim-custom-textarea::-webkit-scrollbar-thumb,
html[data-resolved-theme="dark"] .sim-custom-textarea::-webkit-scrollbar-thumb {
    background: #555D55;
}

html[data-theme="dark"] .sim-custom-textarea::-webkit-scrollbar-thumb:hover,
html[data-resolved-theme="dark"] .sim-custom-textarea::-webkit-scrollbar-thumb:hover {
    background: #6B746B;
}

html[data-theme="dark"] .sim-status-box.warning,
html[data-resolved-theme="dark"] .sim-status-box.warning {
    color: #FDE68A;
    background: #3B2B12;
    border-color: #765925;
}

html[data-theme="dark"] .sim-status-box.danger,
html[data-resolved-theme="dark"] .sim-status-box.danger {
    color: #FDA4AF;
    background: #431D28;
    border-color: #8B3B50;
}

html[data-theme="dark"] .sim-status-box.info,
html[data-resolved-theme="dark"] .sim-status-box.info {
    color: #93C5FD;
    background: #172A46;
    border-color: #315A8D;
}

html[data-theme="dark"] .sim-status-box.success,
html[data-resolved-theme="dark"] .sim-status-box.success {
    color: #A7F3D0;
    background: #153D31;
    border-color: #27745A;
}

html[data-theme="dark"] :where(.sim-vector-amber, .sim-text-amber, .sim-force-angle),
html[data-resolved-theme="dark"] :where(.sim-vector-amber, .sim-text-amber, .sim-force-angle) {
    color: #FBBF24;
}

html[data-theme="dark"] :where(.sim-vector-cyan, .sim-vector-arm),
html[data-resolved-theme="dark"] :where(.sim-vector-cyan, .sim-vector-arm) {
    color: #22D3EE;
}

html[data-theme="dark"] :where(.sim-vector-pink, .sim-vector-force),
html[data-resolved-theme="dark"] :where(.sim-vector-pink, .sim-vector-force) {
    color: #F472B6;
}

html[data-theme="dark"] :where(.sim-text-blue, .sim-text-tension),
html[data-resolved-theme="dark"] :where(.sim-text-blue, .sim-text-tension) {
    color: #93C5FD;
}

html[data-theme="dark"] :where(.sim-text-red, .sim-torque-negative),
html[data-resolved-theme="dark"] :where(.sim-text-red, .sim-torque-negative) {
    color: #FDA4AF;
}

html[data-theme="dark"] :where(.sim-text-green, .sim-text-weight, .sim-torque-positive),
html[data-resolved-theme="dark"] :where(.sim-text-green, .sim-text-weight, .sim-torque-positive) {
    color: #6EE7B7;
}

html[data-theme="dark"] .sim-text-torque,
html[data-resolved-theme="dark"] .sim-text-torque {
    color: #C4B5FD;
}

/* 繪圖內容不跟著 UI 色票轉換，避免既有的深色線條、刻度與向量消失。 */
html[data-theme="dark"] .sim-canvas-container:not(.sim-canvas-theme-dark),
html[data-theme="dark"] .sim-graph-frame,
html[data-theme="dark"] .sim-graph-frame canvas,
html[data-theme="dark"] .sim-math-card canvas,
html[data-theme="dark"] .sim-preview-iframe,
html[data-resolved-theme="dark"] .sim-canvas-container:not(.sim-canvas-theme-dark),
html[data-resolved-theme="dark"] .sim-graph-frame,
html[data-resolved-theme="dark"] .sim-graph-frame canvas,
html[data-resolved-theme="dark"] .sim-math-card canvas,
html[data-resolved-theme="dark"] .sim-preview-iframe {
    color-scheme: light;
    background-color: #FFFFFF;
}

html[data-theme="dark"] .sim-canvas-text-editor,
html[data-resolved-theme="dark"] .sim-canvas-text-editor {
    color-scheme: light;
    color: #111827;
    background: rgba(255, 255, 255, 0.96);
}

@media (prefers-reduced-transparency: reduce) {
    html[data-theme="dark"] :where(.sim-panel, .sim-panel-header, .sim-camera-loading),
    html[data-resolved-theme="dark"] :where(.sim-panel, .sim-panel-header, .sim-camera-loading) {
        background: #191C19;
    }
}

@media (prefers-contrast: more) {
    html[data-theme="dark"] :where(.sim-panel, .sim-camera-loading),
    html[data-resolved-theme="dark"] :where(.sim-panel, .sim-camera-loading) {
        background: #0F110F;
        border-color: #ACC19E;
    }
}