:root {
    --about-brand: #657954;
    --about-brand-dark: #405334;
    --about-brand-deep: #28361f;
    --about-sage: #e7eee2;
    --about-sage-soft: #f2f6ef;
    --about-blue: #0f8eaa;
    --about-ink: #172033;
    --about-muted: #657083;
    --about-line: rgba(74, 94, 58, 0.14);
    --about-surface: rgba(255, 255, 255, 0.88);
    --navbar-height: 70px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--navbar-height) + 1.5rem);
}

body {
    margin: 0;
    overflow-x: hidden;
    background: #f7f9f5;
    color: var(--about-ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
    text-rendering: optimizeLegibility;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button,
input,
textarea,
select {
    font: inherit;
}

.about-skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 12000;
    padding: 0.7rem 1rem;
    border-radius: 0.75rem;
    background: #fff;
    color: var(--about-brand-deep);
    font-weight: 700;
    transform: translateY(-160%);
}

.about-skip-link:focus {
    transform: translateY(0);
}

.about-main {
    min-height: 100vh;
}

.about-shell {
    width: min(100% - clamp(2rem, 7vw, 6rem), 72rem);
    margin-inline: auto;
}

.about-hero {
    position: relative;
    min-height: min(52rem, calc(100svh - var(--navbar-height)));
    padding: calc(var(--navbar-height) + clamp(3rem, 7vw, 6rem)) 0 clamp(4rem, 9vw, 7rem);
    overflow: hidden;
    background:
        radial-gradient(circle at 12% 18%, rgba(82, 153, 177, 0.12), transparent 28rem),
        radial-gradient(circle at 84% 12%, rgba(117, 148, 91, 0.16), transparent 30rem),
        linear-gradient(180deg, #fbfcfa 0%, #f3f7f0 100%);
}

.about-hero::after {
    position: absolute;
    right: -10rem;
    bottom: -15rem;
    width: 34rem;
    height: 34rem;
    border: 1px solid rgba(101, 121, 84, 0.1);
    border-radius: 50%;
    content: "";
}

.about-hero-orbit {
    position: absolute;
    border: 1px solid rgba(101, 121, 84, 0.12);
    border-radius: 50%;
    pointer-events: none;
}

.about-hero-orbit::after {
    position: absolute;
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--about-brand);
    box-shadow: 0 0 0 0.35rem rgba(101, 121, 84, 0.1);
    content: "";
}

.about-hero-orbit-one {
    top: 7rem;
    left: -8rem;
    width: 25rem;
    height: 25rem;
}

.about-hero-orbit-one::after {
    top: 7rem;
    right: 1.2rem;
}

.about-hero-orbit-two {
    top: 2rem;
    right: 3vw;
    width: 12rem;
    height: 12rem;
}

.about-hero-orbit-two::after {
    bottom: 0.8rem;
    left: 2rem;
    background: var(--about-blue);
}

.about-hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(19rem, 0.72fr);
    align-items: center;
    gap: clamp(3rem, 8vw, 7rem);
}

.about-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: clamp(2.5rem, 6vw, 5rem);
    color: #7c8878;
    font-size: 0.78rem;
}

.about-breadcrumb a {
    color: var(--about-brand-dark);
    text-underline-offset: 0.2rem;
}

.about-eyebrow {
    margin: 0 0 0.75rem;
    color: var(--about-brand);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.16em;
}

.about-hero h1 {
    max-width: 15ch;
    margin: 0;
    color: #101827;
    font-size: clamp(2.65rem, 5.2vw, 5.25rem);
    font-weight: 820;
    letter-spacing: -0.055em;
    line-height: 1.06;
}

.about-lead {
    max-width: 37rem;
    margin: 1.6rem 0 0;
    color: #566274;
    font-size: clamp(1rem, 0.95rem + 0.28vw, 1.15rem);
    line-height: 1.9;
}

.about-mission {
    margin: 1.4rem 0 0;
    color: var(--about-brand-dark);
    font-size: 0.9rem;
    font-weight: 780;
    letter-spacing: 0.04em;
}

.about-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.about-button {
    display: inline-flex;
    min-height: 3rem;
    padding: 0.75rem 1.05rem;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    border: 1px solid transparent;
    border-radius: 0.9rem;
    font-size: 0.86rem;
    font-weight: 720;
    text-decoration: none;
    transition: transform 0.12s ease, background-color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.about-button svg {
    width: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
}

.about-button-primary {
    background: var(--about-brand);
    box-shadow: 0 10px 26px rgba(64, 83, 52, 0.2);
    color: #fff;
}

.about-button-primary:hover {
    background: var(--about-brand-dark);
    box-shadow: 0 14px 32px rgba(64, 83, 52, 0.26);
}

.about-button-secondary {
    border-color: var(--about-line);
    background: rgba(255, 255, 255, 0.72);
    color: var(--about-brand-dark);
}

.about-button-secondary:hover {
    border-color: rgba(74, 94, 58, 0.32);
    background: #fff;
}

.about-button:active,
.about-cert-card:active,
.about-contact-link:active {
    transform: scale(0.98);
}

.about-button:focus-visible,
.about-cert-card:focus-visible,
.about-contact-link:focus-visible,
.about-modal-close:focus-visible {
    outline: 3px solid rgba(15, 142, 170, 0.35);
    outline-offset: 0.2rem;
}

.about-quick-facts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    max-width: 43rem;
    margin: 3rem 0 0;
    padding: 0;
    border-block: 1px solid var(--about-line);
}

.about-quick-facts div {
    padding: 1rem 1rem 1rem 0;
}

.about-quick-facts div + div {
    padding-left: 1rem;
    border-left: 1px solid var(--about-line);
}

.about-quick-facts dt {
    margin-bottom: 0.25rem;
    color: #7b8678;
    font-size: 0.7rem;
}

.about-quick-facts dd {
    margin: 0;
    color: #293622;
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.5;
}

.about-portrait {
    position: relative;
    width: min(100%, 24rem);
    margin: 0;
    justify-self: end;
}

.about-portrait::before {
    position: absolute;
    inset: 1.25rem -1.25rem -1.25rem 1.25rem;
    border-radius: 2rem;
    background: linear-gradient(145deg, #718760, #3e5232);
    content: "";
}

.about-portrait-frame {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 2rem;
    background: #dfe8da;
    box-shadow: 0 28px 70px rgba(40, 54, 31, 0.2);
}

.about-portrait img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center 52%;
}

.about-portrait figcaption {
    position: absolute;
    right: -1rem;
    bottom: 1.5rem;
    display: grid;
    min-width: 12rem;
    gap: 0.15rem;
    padding: 0.85rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.62);
    border-radius: 1rem;
    background: rgba(252, 253, 251, 0.82);
    box-shadow: 0 14px 34px rgba(32, 43, 26, 0.16);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.about-portrait figcaption span {
    color: var(--about-brand-deep);
    font-size: 0.82rem;
    font-weight: 780;
}

.about-portrait figcaption small {
    color: #71806c;
    font-size: 0.68rem;
}

.about-section {
    padding: clamp(5rem, 10vw, 8.5rem) 0;
}

.about-section-grid {
    display: grid;
    grid-template-columns: minmax(14rem, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
    gap: clamp(3rem, 8vw, 7rem);
}

.about-section-heading {
    max-width: 31rem;
}

.about-section-heading h2,
.about-centered-heading h2,
.about-contact h2 {
    margin: 0;
    color: #172033;
    font-size: clamp(2rem, 3.2vw, 3.35rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.15;
}

.about-section-heading > p:last-child,
.about-centered-heading > p:last-child {
    margin: 1rem 0 0;
    color: var(--about-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

.about-prose {
    max-width: 43rem;
}

.about-prose > p {
    margin: 0;
    color: #536073;
    font-size: clamp(1rem, 0.96rem + 0.18vw, 1.08rem);
    line-height: 2;
}

.about-prose > p + p {
    margin-top: 1.3rem;
}

.about-prose blockquote {
    position: relative;
    margin: 2.4rem 0 0;
    padding: 1.6rem 1.8rem 1.6rem 2rem;
    border: 0;
    border-left: 0.25rem solid var(--about-brand);
    border-radius: 0 1.25rem 1.25rem 0;
    background: var(--about-sage-soft);
}

.about-prose blockquote p {
    margin: 0;
    color: var(--about-brand-deep);
    font-size: clamp(1.08rem, 1rem + 0.35vw, 1.28rem);
    font-weight: 700;
    line-height: 1.75;
}

.about-audience {
    background: #eef3eb;
}

.about-centered-heading {
    max-width: 45rem;
    margin-inline: auto;
    text-align: center;
}

.about-audience-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 3rem;
}

.about-audience-card {
    position: relative;
    min-height: 24rem;
    padding: clamp(1.6rem, 4vw, 2.7rem);
    overflow: hidden;
    border: 1px solid var(--about-line);
    border-radius: 1.8rem;
    background: rgba(255, 255, 255, 0.82);
    box-shadow: 0 14px 44px rgba(42, 56, 33, 0.07);
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.about-audience-card::after {
    position: absolute;
    top: -5rem;
    right: -5rem;
    width: 15rem;
    height: 15rem;
    border-radius: 50%;
    background: currentColor;
    content: "";
    opacity: 0.045;
}

.about-audience-card:hover {
    border-color: rgba(74, 94, 58, 0.3);
    box-shadow: 0 22px 58px rgba(42, 56, 33, 0.11);
    transform: translateY(-0.25rem);
}

.about-audience-student {
    color: #176f8b;
}

.about-audience-teacher {
    color: var(--about-brand-dark);
}

.about-card-index {
    color: currentColor;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.about-card-label {
    margin: 3.25rem 0 0.75rem;
    color: currentColor;
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.about-audience-card h3 {
    max-width: 18ch;
    margin: 0;
    color: var(--about-ink);
    font-size: clamp(1.45rem, 2.4vw, 2.15rem);
    font-weight: 790;
    letter-spacing: -0.035em;
    line-height: 1.3;
}

.about-audience-card > p:not(.about-card-label) {
    max-width: 34rem;
    margin: 1.1rem 0 0;
    color: var(--about-muted);
    font-size: 0.94rem;
    line-height: 1.85;
}

.about-audience-card a {
    position: absolute;
    bottom: 2rem;
    left: clamp(1.6rem, 4vw, 2.7rem);
    color: currentColor;
    font-size: 0.82rem;
    font-weight: 750;
    text-underline-offset: 0.25rem;
}

.about-heading-wide {
    max-width: 45rem;
}

.about-timeline {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin: 3.5rem 0 0;
    padding: 0 0 0 1.05rem;
    list-style: none;
}

.about-timeline::before {
    position: absolute;
    top: 0.45rem;
    bottom: 1.4rem;
    left: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--about-brand), rgba(101, 121, 84, 0.12));
    content: "";
}

.about-timeline li {
    position: relative;
    display: grid;
    grid-template-columns: minmax(7.5rem, 0.32fr) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 5vw, 4rem);
    padding: 0 0 2.4rem 2.2rem;
}

.about-timeline li::before {
    position: absolute;
    top: 0.35rem;
    left: -1.4rem;
    width: 0.78rem;
    height: 0.78rem;
    border: 0.22rem solid #f7f9f5;
    border-radius: 50%;
    background: var(--about-brand);
    box-shadow: 0 0 0 1px rgba(101, 121, 84, 0.25);
    content: "";
}

.about-timeline time,
.about-time-range,
.about-time-now {
    color: var(--about-brand);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.about-timeline h3 {
    grid-column: 2;
    margin: -0.2rem 0 0;
    color: var(--about-ink);
    font-size: clamp(1rem, 0.94rem + 0.28vw, 1.2rem);
    line-height: 1.45;
}

.about-timeline p {
    grid-column: 2;
    max-width: 46rem;
    margin: 0.55rem 0 0;
    color: var(--about-muted);
    font-size: 0.88rem;
    line-height: 1.8;
}

.about-certifications {
    background:
        radial-gradient(circle at 10% 85%, rgba(15, 142, 170, 0.08), transparent 25rem),
        #f1f5ee;
}

.about-cert-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 2rem;
}

.about-cert-count {
    display: flex;
    margin: 0;
    align-items: baseline;
    gap: 0.5rem;
    color: var(--about-brand);
}

.about-cert-count strong {
    font-size: 3rem;
    letter-spacing: -0.06em;
}

.about-cert-count span {
    color: var(--about-muted);
    font-size: 0.75rem;
}

.about-cert-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 3rem;
}

.about-cert-card {
    display: flex;
    min-width: 0;
    min-height: 9.5rem;
    padding: 1.15rem;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--about-line);
    border-radius: 1.35rem;
    background: rgba(255, 255, 255, 0.84);
    box-shadow: 0 10px 34px rgba(42, 56, 33, 0.055);
    color: inherit;
    cursor: pointer;
    text-align: left;
    transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.about-cert-card:hover {
    border-color: rgba(74, 94, 58, 0.32);
    box-shadow: 0 18px 44px rgba(42, 56, 33, 0.1);
    transform: translateY(-0.2rem);
}

.about-cert-badge {
    display: grid;
    width: 4.75rem;
    min-width: 4.75rem;
    height: 4.75rem;
    place-items: center;
    border-radius: 1rem;
    background: var(--about-sage-soft);
}

.about-cert-badge img {
    width: 3.85rem;
    height: 3.85rem;
    display: block;
    object-fit: contain;
}

.about-cert-copy {
    display: grid;
    min-width: 0;
    gap: 0.32rem;
}

.about-cert-copy small {
    color: var(--about-brand);
    font-size: 0.65rem;
    font-weight: 760;
    letter-spacing: 0.04em;
}

.about-cert-copy strong {
    color: var(--about-ink);
    font-size: 0.86rem;
    line-height: 1.45;
}

.about-cert-copy > span {
    color: #748171;
    font-size: 0.7rem;
}

.about-contact {
    padding: clamp(5rem, 10vw, 8rem) 0;
    background: #344529;
}

.about-contact-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(2rem, 7vw, 6rem);
}

.about-contact .about-eyebrow {
    color: #bcd1ae;
}

.about-contact h2 {
    color: #fff;
}

.about-contact-card > div > p:last-child {
    max-width: 42rem;
    margin: 1rem 0 0;
    color: #d4dfce;
    font-size: 0.96rem;
    line-height: 1.8;
}

.about-contact-link {
    display: grid;
    min-width: 14rem;
    gap: 0.2rem;
    padding: 1rem 1.2rem;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    text-decoration: none;
    transition: transform 0.12s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.about-contact-link:hover {
    border-color: rgba(255, 255, 255, 0.45);
    background: rgba(255, 255, 255, 0.16);
}

.about-contact-link span {
    font-size: 0.84rem;
    font-weight: 760;
}

.about-contact-link small {
    color: #c9d8c1;
    font-size: 0.7rem;
}

.about-modal {
    position: fixed;
    inset: 0;
    z-index: 11000;
    display: flex;
    padding: 1rem;
    align-items: center;
    justify-content: center;
    background: rgba(18, 26, 16, 0.48);
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(12px) saturate(120%);
    -webkit-backdrop-filter: blur(12px) saturate(120%);
    transition: opacity 0.18s ease;
}

.about-modal[hidden] {
    display: none;
}

.about-modal.is-open {
    opacity: 1;
    pointer-events: auto;
}

.about-modal-dialog {
    width: min(100%, 56rem);
    max-height: calc(100dvh - 2rem);
    overflow: auto;
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 1.5rem;
    background: rgba(251, 252, 250, 0.96);
    box-shadow: 0 28px 90px rgba(13, 22, 10, 0.28);
    transform: translateY(0.75rem) scale(0.985);
    transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

.about-modal.is-open .about-modal-dialog {
    transform: translateY(0) scale(1);
}

.about-modal-header {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    padding: 1rem 1rem 0.9rem 1.25rem;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border-bottom: 1px solid var(--about-line);
    background: rgba(251, 252, 250, 0.9);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.about-modal-header .about-eyebrow {
    margin-bottom: 0.2rem;
    font-size: 0.62rem;
}

.about-modal-header h2 {
    margin: 0;
    color: var(--about-ink);
    font-size: 1rem;
}

.about-modal-close {
    display: grid;
    width: 2.75rem;
    min-width: 2.75rem;
    height: 2.75rem;
    place-items: center;
    border: 1px solid var(--about-line);
    border-radius: 999px;
    background: var(--about-sage-soft);
    color: var(--about-brand-dark);
    cursor: pointer;
}

.about-modal-close svg {
    width: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-width: 1.8;
}

.about-modal-media {
    padding: 1rem;
    background: #edf2e9;
}

.about-modal-media img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 0.8rem;
    background: #fff;
}

@media (max-width: 960px) {
    .about-hero {
        min-height: auto;
    }

    .about-hero-grid {
        grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.68fr);
        gap: 3rem;
    }

    .about-hero h1 {
        font-size: clamp(2.5rem, 6vw, 4.1rem);
    }

    .about-section-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about-cert-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .about-shell {
        width: min(100% - 2rem, 72rem);
    }

    .about-hero {
        padding-top: calc(var(--navbar-height) + 2rem);
    }

    .about-hero-grid {
        grid-template-columns: 1fr;
    }

    .about-breadcrumb {
        margin-bottom: 2.5rem;
    }

    .about-portrait {
        width: min(88%, 23rem);
        justify-self: center;
    }

    .about-quick-facts {
        grid-template-columns: 1fr;
    }

    .about-quick-facts div {
        padding: 0.85rem 0;
    }

    .about-quick-facts div + div {
        padding-left: 0;
        border-top: 1px solid var(--about-line);
        border-left: 0;
    }

    .about-audience-grid,
    .about-cert-grid {
        grid-template-columns: 1fr;
    }

    .about-audience-card {
        min-height: 25rem;
    }

    .about-timeline {
        padding-left: 1.1rem;
    }

    .about-timeline::before {
        left: 0.36rem;
    }

    .about-timeline li {
        grid-template-columns: 1fr;
        padding: 0 0 2.25rem 1.65rem;
    }

    .about-timeline li::before {
        top: 0.2rem;
        left: -1.12rem;
    }

    .about-timeline h3,
    .about-timeline p {
        grid-column: 1;
    }

    .about-timeline h3 {
        margin-top: 0.65rem;
    }

    .about-cert-header,
    .about-contact-card {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .about-cert-header {
        display: grid;
    }

    .about-cert-count {
        display: none;
    }

    .about-contact-link {
        width: 100%;
        min-width: 0;
    }
}

@media (max-width: 420px) {
    .about-hero h1 {
        font-size: 2.45rem;
    }

    .about-hero-actions {
        display: grid;
        grid-template-columns: 1fr;
    }

    .about-button {
        width: 100%;
    }

    .about-portrait figcaption {
        right: -0.5rem;
        bottom: 1rem;
    }

    .about-cert-card {
        min-height: 8.5rem;
        padding: 1rem;
    }

    .about-cert-badge {
        width: 4rem;
        min-width: 4rem;
        height: 4rem;
    }

    .about-cert-badge img {
        width: 3.35rem;
        height: 3.35rem;
    }

    .about-modal {
        padding: 0;
        align-items: flex-end;
    }

    .about-modal-dialog {
        width: 100%;
        max-height: 92dvh;
        border-radius: 1.5rem 1.5rem 0 0;
        transform: translateY(1.25rem) scale(0.99);
        transform-origin: bottom center;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .about-button,
    .about-cert-card,
    .about-contact-link,
    .about-modal,
    .about-modal-dialog {
        transition-duration: 1ms !important;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .about-portrait figcaption,
    .about-modal,
    .about-modal-header {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .about-portrait figcaption,
    .about-modal-header {
        background: #fff;
    }
}

@media (prefers-contrast: more) {
    .about-button-secondary,
    .about-audience-card,
    .about-cert-card,
    .about-contact-link,
    .about-modal-dialog {
        border-color: currentColor;
    }
}

@media print {
    #site-navbar,
    #site-footer,
    .about-hero-actions,
    .about-contact,
    .about-modal {
        display: none !important;
    }

    .about-hero,
    .about-audience,
    .about-certifications {
        background: #fff;
    }

    .about-section {
        padding: 2rem 0;
    }

    .about-portrait::before {
        display: none;
    }
}