/* ===== STEB Demo — Refined Academic Editorial ===== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #fdfcfa;
    --color-bg-alt: #f5f3ef;
    --color-bg-card: #ffffff;
    --color-text: #2c2a28;
    --color-text-secondary: #6b6560;
    --color-text-dim: #9b9590;
    --color-accent: #c45d3e;
    --color-accent-soft: #f8ebe6;
    --color-accent-deep: #8b3a24;
    --color-border: #e8e4df;
    --color-border-light: #f0ede8;
    --color-score-high: #2e7d4f;
    --color-score-mid: #b8860b;
    --color-score-low: #c0392b;
    --font-display: 'Source Serif 4', 'Palatino Linotype', Palatino, Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --max-width: 960px;
    --radius: 6px;
    --shadow-sm: 0 1px 3px rgba(44, 42, 40, 0.04);
    --shadow-md: 0 4px 16px rgba(44, 42, 40, 0.06);
    --shadow-lg: 0 8px 32px rgba(44, 42, 40, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Layout ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 4.5rem 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--color-text);
}

h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.75rem;
    text-align: center;
    letter-spacing: -0.02em;
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--color-accent);
    margin: 0.6rem auto 0;
    border-radius: 2px;
}

h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

h4 {
    font-size: 0.95rem;
    font-weight: 600;
}

.sc {
    font-variant: small-caps;
    font-size: 1.05em;
    letter-spacing: 0.04em;
    font-weight: 600;
}

/* ===== Hero / Header ===== */
.hero {
    padding: 5.5rem 0 4rem;
    text-align: center;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(196, 93, 62, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(196, 93, 62, 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.title {
    font-family: var(--font-display);
    font-size: 2.1rem;
    font-weight: 700;
    line-height: 1.35;
    max-width: 720px;
    margin: 0 auto 1.25rem;
    letter-spacing: -0.015em;
    position: relative;
}

.authors {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-dim);
    margin-bottom: 1.75rem;
    font-style: italic;
    letter-spacing: 0.02em;
}

.badges {
    display: flex;
    gap: 0.6rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
    letter-spacing: 0.01em;
}

.badge-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.badge-emoji {
    font-size: 0.95rem;
    line-height: 1;
    flex-shrink: 0;
}

.badge:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.badge-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.badge-primary:hover {
    background: var(--color-accent-deep);
    border-color: var(--color-accent-deep);
    color: #fff;
    box-shadow: 0 2px 8px rgba(196, 93, 62, 0.25);
}

/* ===== Abstract ===== */
.abstract-text {
    font-family: var(--font-display);
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--color-text);
    text-align: justify;
    hyphens: auto;
    max-width: 800px;
    margin: 0 auto;
}

/* ===== Figures ===== */
.figure-full {
    text-align: center;
    margin: 1.5rem 0;
}

.figure-full img {
    width: 100%;
    max-width: 100%;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
}

.figure-full figcaption {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
    text-align: left;
    padding: 0 0.25rem;
}

/* ===== Highlights Grid ===== */
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.highlight-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.highlight-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.highlight-icon {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    font-family: var(--font-body);
}

.highlight-card h3 {
    font-size: 0.92rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: var(--font-body);
    letter-spacing: -0.01em;
}

.highlight-card p {
    font-size: 0.84rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Contributions ===== */
.contribution-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 760px;
    margin: 0 auto;
}

.contribution-list li {
    position: relative;
    padding-left: 1.75rem;
    font-size: 0.93rem;
    line-height: 1.75;
    color: var(--color-text);
}

.contribution-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6rem;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: var(--color-accent);
    transform: rotate(45deg);
}

/* ===== Audio Demos ===== */
.demo-description {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-size: 0.92rem;
}

.demo-block {
    margin-top: 3rem;
}

.demo-block > h3 {
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.demo-subsection {
    margin-top: 2.5rem;
}

.demo-subsection > h3 {
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-dim);
    padding-bottom: 0.5rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.source-demo-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.source-demo-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.source-demo-card h4 {
    margin-bottom: 0.75rem;
    font-size: 0.88rem;
    color: var(--color-accent-deep);
    font-family: var(--font-body);
    font-weight: 600;
}

.source-table th {
    width: 130px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-dim);
    vertical-align: top;
    padding-top: 0.65rem;
}

/* ===== Comparison Section ===== */
.comparison-demo-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.comparison-demo-card > h3 {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.source-context {
    margin-bottom: 1.25rem;
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--color-accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    background: var(--color-bg-alt);
}

.source-context p {
    margin-top: 0.5rem;
    font-size: 0.84rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.demo-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
    border: 1px solid var(--color-border-light);
}

.comparison-table {
    min-width: 680px;
}

/* ===== Demo Table ===== */
.demo-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.86rem;
}

.demo-table th,
.demo-table td {
    padding: 0.65rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

.demo-table thead th {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-dim);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 0.7rem 0.85rem;
    white-space: nowrap;
}

.demo-table tbody tr {
    transition: background 0.15s ease;
}

.demo-table tbody tr:hover {
    background: rgba(196, 93, 62, 0.02);
}

.demo-table tbody tr:last-child td {
    border-bottom: none;
}

.demo-table td:first-child {
    font-weight: 600;
    font-size: 0.82rem;
    white-space: nowrap;
    color: var(--color-text);
}

/* Score cells */
.demo-table td:nth-last-child(1),
.demo-table td:nth-last-child(2) {
    text-align: center;
    font-weight: 700;
    font-size: 0.82rem;
    font-family: var(--font-mono);
    min-width: 44px;
}

/* Audio players */
.demo-table audio {
    height: 32px;
    width: 200px;
    border-radius: 100px;
}

.source-context audio {
    margin-bottom: 0.25rem;
}

.transcript {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    line-height: 1.55;
    max-width: 320px;
}

/* Caption details */
.demo-details summary {
    cursor: pointer;
    color: var(--color-accent);
    font-weight: 500;
    font-size: 0.82rem;
    transition: color 0.15s ease;
}

.demo-details summary:hover {
    color: var(--color-accent-deep);
}

.demo-details p {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* ===== Footer ===== */
.footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-dim);
    font-size: 0.82rem;
    letter-spacing: 0.02em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 1.25rem;
    }

    .title {
        font-size: 1.5rem;
    }

    .highlights-grid {
        grid-template-columns: 1fr;
    }

    h2 {
        font-size: 1.4rem;
    }

    .demo-table audio {
        width: 160px;
    }

    .source-demo-card {
        padding: 1rem;
    }

    .comparison-demo-card {
        padding: 1rem;
    }

    .source-table th,
    .source-table td {
        display: block;
        width: 100%;
    }

    .source-table th {
        border-bottom: 0;
        padding-bottom: 0.15rem;
    }

    .source-table td {
        padding-top: 0.15rem;
    }

    .comparison-table {
        min-width: 580px;
    }
}