:root {
    --bg: #f5f0e7;
    --paper: rgba(255, 251, 245, 0.82);
    --paper-strong: rgba(255, 251, 245, 0.94);
    --ink: #172534;
    --muted: #5e6c79;
    --line: rgba(23, 37, 52, 0.12);
    --line-strong: rgba(23, 37, 52, 0.24);
    --accent: #a94f2d;
    --accent-soft: rgba(169, 79, 45, 0.12);
    --deep: #203847;
    --sage: #5c7268;
    --shadow: 0 28px 80px rgba(23, 37, 52, 0.12);
    --radius-lg: 2rem;
    --radius-md: 1.35rem;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
    color: var(--ink);
    background:
        linear-gradient(90deg, rgba(23, 37, 52, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(23, 37, 52, 0.05) 1px, transparent 1px),
        radial-gradient(circle at top left, rgba(169, 79, 45, 0.16), transparent 28%),
        radial-gradient(circle at right 15%, rgba(92, 114, 104, 0.18), transparent 20%),
        linear-gradient(180deg, #f8f4ec 0%, #efe7d9 100%);
    background-size: 72px 72px, 72px 72px, auto, auto, auto;
    position: relative;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

body::before {
    background:
        radial-gradient(circle at 10% 0%, rgba(255, 255, 255, 0.76), transparent 34%),
        radial-gradient(circle at 100% 10%, rgba(255, 255, 255, 0.38), transparent 20%);
}

body::after {
    opacity: 0.15;
    background-image:
        linear-gradient(135deg, transparent 0, transparent calc(50% - 1px), rgba(23, 37, 52, 0.08) calc(50% - 1px), rgba(23, 37, 52, 0.08) calc(50% + 1px), transparent calc(50% + 1px), transparent 100%);
    background-size: 220px 220px;
}

a {
    color: inherit;
    text-decoration: none;
}

.page-shell {
    width: min(1180px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1.25rem 0 4rem;
    position: relative;
    z-index: 1;
}

.site-main,
.homepage-grid,
.stats-grid,
.card-grid,
.announcement-grid,
.material-grid,
.announcement-list,
.course-grid,
.document-list {
    display: grid;
    gap: 1.25rem;
}

.site-main {
    gap: 1.5rem;
}

.site-header {
    margin-bottom: 1.4rem;
}

.site-navbar {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) auto;
    gap: 1.5rem;
    align-items: end;
    padding: 1.3rem 1.45rem;
    border-radius: 1.9rem;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.7), rgba(255, 251, 245, 0.9)),
        var(--paper);
    border: 1px solid rgba(255, 255, 255, 0.58);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
    position: relative;
    overflow: hidden;
}

.site-navbar::after {
    content: "";
    position: absolute;
    left: 1.45rem;
    right: 1.45rem;
    top: 0.85rem;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent 60%);
}

.site-brand-wrap {
    display: grid;
    gap: 0.2rem;
    max-width: 42rem;
}

.kicker,
.section-heading p,
.hero-badge,
.identity-label,
.panel-kicker,
.language-switcher-label,
.announcement-date,
.course-meta,
.course-semester,
.document-filename,
.course-card-footer span,
.page-caption,
.meta-pill,
.site-menu a {
    margin: 0;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    font-size: 0.78rem;
    font-weight: 700;
}

.kicker,
.section-heading p,
.hero-badge,
.identity-label,
.panel-kicker,
.announcement-date,
.course-meta,
.course-semester,
.document-filename,
.page-caption,
.meta-pill,
.language-switcher-label {
    color: var(--sage);
}

.site-title,
.hero-title,
.section-heading h1,
.section-heading h2,
.identity-name,
.announcement-card h3,
.announcement-item h3,
.course-card h3,
.document-card h3,
.info-card h3 {
    font-family: "Noto Serif TC", serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

body.lang-en .site-title,
body.lang-en .hero-title,
body.lang-en .section-heading h1,
body.lang-en .section-heading h2,
body.lang-en .announcement-card h3,
body.lang-en .announcement-item h3,
body.lang-en .course-card h3,
body.lang-en .document-card h3,
body.lang-en .info-card h3 {
    font-family: "Fraunces", "Noto Serif TC", serif;
    letter-spacing: -0.03em;
}

.site-title {
    margin: 0.1rem 0 0;
    max-width: 14ch;
    font-size: clamp(2rem, 4vw, 3.45rem);
    line-height: 0.95;
}

.site-title.is-english,
body.lang-en .site-title {
    max-width: 18ch;
    font-size: clamp(1.6rem, 2.5vw, 2.5rem);
    line-height: 1.03;
}

.site-meta {
    margin: 0.35rem 0 0;
    max-width: 48rem;
    color: var(--muted);
    font-size: 0.96rem;
    line-height: 1.7;
}

.site-nav-stack {
    display: grid;
    gap: 0.8rem;
    justify-items: end;
}

.site-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.55rem;
}

.site-menu a {
    display: inline-flex;
    align-items: center;
    min-height: 2.9rem;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.54);
    color: var(--ink);
    transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.site-menu a.is-active,
.site-menu a:hover,
.site-menu a:focus-visible {
    transform: translateY(-1px);
    background: var(--deep);
    color: #fffaf2;
    border-color: transparent;
}

.language-switcher {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.64);
}

.language-switcher-label {
    padding: 0 0.55rem 0 0.7rem;
}

.language-switcher a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 3.2rem;
    min-height: 2.5rem;
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 700;
}

.language-switcher a.is-active {
    background: var(--ink);
    color: #fffaf2;
}

.hero-card,
.content-block,
.strip-panel {
    background: var(--paper);
    border: 1px solid rgba(255, 255, 255, 0.58);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.hero-card,
.content-block {
    position: relative;
    overflow: hidden;
}

.hero-card::before,
.content-block::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 0.35rem;
    background: linear-gradient(90deg, var(--accent), rgba(169, 79, 45, 0.3) 40%, transparent 100%);
}

.hero-card {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(290px, 0.78fr);
    gap: 1.4rem;
    padding: clamp(1.6rem, 4vw, 2.75rem);
    border-radius: 2.4rem;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.66), rgba(255, 250, 244, 0.96)),
        var(--paper);
}

.hero-copy,
.hero-aside {
    display: grid;
    gap: 1rem;
}

.hero-copy {
    align-content: start;
    padding-right: 1rem;
}

.hero-badge {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    width: fit-content;
}

.hero-badge::before {
    content: "";
    width: 2.75rem;
    height: 1px;
    background: currentColor;
}

.hero-title {
    margin: 0;
    max-width: 14ch;
    font-size: clamp(2.15rem, 4.8vw, 4.15rem);
    line-height: 1.04;
    letter-spacing: -0.02em;
}

body.lang-en .hero-title {
    max-width: 18ch;
    font-size: clamp(1.85rem, 3.3vw, 3.1rem);
    line-height: 1.08;
}

.hero-description,
.lead-paragraph,
.announcement-card p,
.announcement-item p,
.announcement-content,
.course-summary,
.document-card p,
.course-description,
.info-card p,
.detail-list,
.identity-affiliation,
.identity-note,
.empty-state {
    color: var(--muted);
    line-height: 1.78;
}

.hero-description,
.lead-paragraph {
    font-size: 1.02rem;
    max-width: 60ch;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 0.65rem;
}

.hero-actions a,
.download-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 3.2rem;
    padding: 0.85rem 1.2rem;
    border-radius: 999px;
    background: var(--accent);
    color: #fff8f0;
    font-weight: 700;
    white-space: nowrap;
    transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.hero-actions a:hover,
.hero-actions a:focus-visible,
.download-link:hover,
.download-link:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 16px 24px rgba(169, 79, 45, 0.18);
}

.hero-actions a.ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line-strong);
}

.hero-aside {
    align-content: stretch;
}

.identity-panel,
.hero-note-panel,
.stat-card,
.announcement-card,
.announcement-item,
.course-card,
.document-card,
.info-card,
.strip-panel {
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
}

.identity-panel {
    padding: 1.45rem;
    background:
        radial-gradient(circle at top right, rgba(255, 255, 255, 0.08), transparent 34%),
        linear-gradient(180deg, rgba(23, 37, 52, 0.98), rgba(32, 56, 71, 0.96));
    color: #f7f3ec;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.identity-name {
    margin: 0.55rem 0 0.35rem;
    font-size: clamp(1.75rem, 3vw, 2.45rem);
    line-height: 1;
}

.identity-affiliation,
.identity-note {
    color: rgba(247, 243, 236, 0.76);
}

.identity-note a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

.hero-note-panel {
    padding: 1.2rem;
    background: rgba(255, 255, 255, 0.62);
}

.hero-note-list {
    display: grid;
    gap: 0.9rem;
}

.hero-note-item + .hero-note-item {
    padding-top: 0.9rem;
    border-top: 1px solid var(--line);
}

.hero-note-item h3 {
    margin: 0;
    font-size: 1.08rem;
    line-height: 1.45;
}

.stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card {
    padding: 1.2rem 1.25rem;
    background: rgba(255, 251, 245, 0.76);
    position: relative;
}

.stat-card::before {
    content: "";
    position: absolute;
    top: 1rem;
    left: 1rem;
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 1.2rem 0 0 var(--accent-soft);
}

.stat-value {
    margin: 1.35rem 0 0.35rem;
    font-family: "Fraunces", "Noto Serif TC", serif;
    font-size: 1.5rem;
    font-weight: 600;
}

.stat-label {
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.content-block {
    padding: 1.8rem;
    border-radius: var(--radius-lg);
}

.content-block-accent {
    background:
        linear-gradient(135deg, rgba(169, 79, 45, 0.06), rgba(255, 251, 245, 0.92)),
        var(--paper);
}

.content-block-dark {
    background:
        radial-gradient(circle at top right, rgba(255, 255, 255, 0.08), transparent 24%),
        linear-gradient(180deg, rgba(23, 37, 52, 0.96), rgba(32, 56, 71, 0.95));
    color: #f8f4ed;
}

.content-block-dark::before {
    background: linear-gradient(90deg, #d38d68, rgba(211, 141, 104, 0.24) 40%, transparent 100%);
}

.content-block-dark .section-heading p,
.content-block-dark .detail-list,
.content-block-dark .info-card p {
    color: rgba(247, 243, 236, 0.72);
}

.content-block-dark .section-heading h2 {
    color: #fffaf2;
}

.content-block-dark .info-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
}

.content-block-dark .info-card h3 {
    color: #fffaf2;
}

.homepage-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: stretch;
}

.section-description {
    margin-bottom: 0;
}

.section-heading h1,
.section-heading h2 {
    margin: 0.45rem 0 0;
    max-width: 16ch;
    font-size: clamp(1.9rem, 4vw, 3.1rem);
    line-height: 1;
}

body.lang-en .section-heading h1,
body.lang-en .section-heading h2 {
    max-width: 18ch;
    line-height: 1.06;
}

.page-hero .section-heading h1 {
    margin-top: 0.5rem;
}

.page-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(160px, 0.28fr);
    gap: 1rem;
    align-items: start;
}

.page-hero-meta {
    padding: 1rem 1.1rem;
    border-radius: 1.2rem;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.46);
    text-align: right;
}

.page-count {
    margin: 0;
    font-family: "Fraunces", "Noto Serif TC", serif;
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1;
}

.two-column {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.95fr);
    gap: 2rem;
    margin-top: 1.35rem;
}

.card-grid,
.announcement-grid {
    margin-top: 1.35rem;
}

.card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.announcement-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.announcement-card,
.course-card,
.material-card,
.document-card,
.info-card,
.announcement-item {
    padding: 1.3rem;
    background: rgba(255, 255, 255, 0.46);
}

.announcement-card,
.course-card,
.material-card,
.info-card {
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.announcement-card:hover,
.course-card:hover,
.material-card:hover,
.info-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 36px rgba(23, 37, 52, 0.1);
    border-color: var(--line-strong);
}

.announcement-date {
    margin-bottom: 0.7rem;
}

.announcement-card h3,
.announcement-item h3,
.course-card h3,
.document-card h3,
.info-card h3 {
    margin: 0 0 0.7rem;
    font-size: 1.22rem;
    line-height: 1.35;
}

.announcement-list {
    gap: 1rem;
}

.announcement-item {
    padding-left: 1.5rem;
    position: relative;
}

.announcement-item::before {
    content: "";
    position: absolute;
    left: 0.55rem;
    top: 1.45rem;
    bottom: 1.45rem;
    width: 2px;
    background: linear-gradient(180deg, var(--accent), rgba(169, 79, 45, 0.16));
}

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

.material-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 1.35rem;
}

.course-card,
.document-card {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.course-summary,
.document-card p,
.course-description {
    margin: 0;
}

.course-card-footer,
.course-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    align-items: center;
}

.course-card-footer {
    justify-content: space-between;
    margin-top: auto;
    padding-top: 0.8rem;
    border-top: 1px solid var(--line);
}

.meta-pill-group {
    margin: 1.1rem 0 0;
}

.meta-pill {
    padding: 0.55rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.52);
}

.course-hero {
    gap: 1rem;
}

.course-description {
    margin-top: 0.2rem;
}

.course-description p:last-child,
.announcement-content p:last-child {
    margin-bottom: 0;
}

.document-list {
    margin-top: 1.35rem;
}

.document-card {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.document-card > div {
    display: grid;
    gap: 0.35rem;
}

.material-card {
    display: grid;
    gap: 0.65rem;
}

.material-card h3 {
    margin: 0;
}

.material-card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.75;
}

.document-filename {
    margin-top: 0.2rem;
}

.strip-panel {
    margin-top: 1.25rem;
    padding: 1.2rem 1.3rem;
    background: rgba(255, 255, 255, 0.48);
}

.detail-list {
    margin: 0;
    padding-left: 1.2rem;
}

.detail-list li + li {
    margin-top: 0.65rem;
}

.section-link-row {
    margin-top: 1rem;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    font-weight: 700;
}

.text-link::after {
    content: "→";
    transition: transform 180ms ease;
}

.text-link:hover::after,
.text-link:focus-visible::after {
    transform: translateX(3px);
}

.empty-state {
    margin: 0;
}

.material-article {
    display: grid;
    gap: 1.2rem;
}

.material-article .section-heading h1 {
    max-width: 20ch;
}

.material-markdown {
    color: var(--ink);
    line-height: 1.85;
}

.material-markdown > :first-child {
    margin-top: 0;
}

.material-markdown > :last-child {
    margin-bottom: 0;
}

.material-markdown h1,
.material-markdown h2,
.material-markdown h3,
.material-markdown h4 {
    font-family: "Noto Serif TC", serif;
    line-height: 1.2;
    margin: 1.5rem 0 0.75rem;
}

body.lang-en .material-markdown h1,
body.lang-en .material-markdown h2,
body.lang-en .material-markdown h3,
body.lang-en .material-markdown h4 {
    font-family: "Fraunces", "Noto Serif TC", serif;
}

.material-markdown p,
.material-markdown ul,
.material-markdown ol,
.material-markdown blockquote,
.material-markdown pre,
.material-markdown table {
    margin: 0 0 1rem;
}

.material-markdown ul,
.material-markdown ol {
    padding-left: 1.35rem;
}

.material-markdown li + li {
    margin-top: 0.35rem;
}

.material-markdown a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 0.16em;
}

.material-markdown code {
    padding: 0.12rem 0.35rem;
    border-radius: 0.4rem;
    background: rgba(23, 37, 52, 0.08);
    font-family: "SFMono-Regular", "Menlo", monospace;
    font-size: 0.92em;
}

.material-markdown pre {
    padding: 1rem;
    overflow-x: auto;
    border-radius: 1rem;
    background: #1d2f3a;
    color: #f8f4ed;
}

.material-markdown pre code {
    padding: 0;
    background: transparent;
    color: inherit;
}

.material-markdown blockquote {
    padding: 0.2rem 0 0.2rem 1rem;
    border-left: 3px solid var(--accent);
    color: var(--muted);
}

.material-markdown table {
    width: 100%;
    border-collapse: collapse;
}

.material-markdown th,
.material-markdown td {
    padding: 0.75rem;
    border: 1px solid var(--line);
    text-align: left;
}

.hero-card,
.content-block,
.site-navbar,
.stats-grid .stat-card {
    animation: rise-in 700ms ease both;
}

.hero-card {
    animation-delay: 80ms;
}

.stats-grid .stat-card:nth-child(1) {
    animation-delay: 140ms;
}

.stats-grid .stat-card:nth-child(2) {
    animation-delay: 220ms;
}

.stats-grid .stat-card:nth-child(3) {
    animation-delay: 300ms;
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(18px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 980px) {
    .site-navbar,
    .hero-card,
    .homepage-grid,
    .two-column,
    .page-hero-grid,
    .card-grid,
    .announcement-grid,
    .material-grid,
    .course-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .site-nav-stack {
        justify-items: start;
    }

    .site-menu {
        justify-content: flex-start;
    }

    .page-hero-meta {
        text-align: left;
    }

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

@media (max-width: 720px) {
    body {
        background-size: 48px 48px, 48px 48px, auto, auto, auto;
    }

    .page-shell {
        width: min(100% - 1rem, 1180px);
    }

    .site-navbar,
    .hero-card,
    .content-block {
        padding: 1.2rem;
        border-radius: 1.45rem;
    }

    .site-title {
        font-size: clamp(1.75rem, 8vw, 2.65rem);
    }

    .hero-title {
        max-width: 16ch;
        font-size: clamp(1.85rem, 8vw, 2.7rem);
        line-height: 1.08;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions a,
    .download-link {
        width: 100%;
    }

    .card-grid,
    .announcement-grid,
    .material-grid {
        grid-template-columns: 1fr;
    }

    .document-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .language-switcher {
        flex-wrap: wrap;
        border-radius: 1.2rem;
    }

    .language-switcher-label {
        width: 100%;
        padding: 0.3rem 0.4rem 0;
    }
}