:root {
    --bg: #f8fafb;
    --card: #ffffff;
    --border: #e5e7eb;
    --text: #1f2937;
    --muted: #6b7280;
    --accent: #3b82f6;
    --accent-dark: #1d4ed8;
    --accent-light: #eff6ff;
    --best: #dbeafe;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    scroll-behavior: smooth;
}

header {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    padding: 45px 20px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

header>* {
    position: relative;
    z-index: 1;
}

header h1 {
    margin: 0 0 8px 0;
    font-size: 2.3em;
    font-weight: 800;
    letter-spacing: -1px;
}

header .subtitle {
    margin: 0;
    font-size: 1em;
    opacity: 0.95;
    font-weight: 400;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.abstract-card {
    background: var(--card);
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.abstract-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.abstract-card h2 {
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--accent);
    font-size: 1.3em;
}

.abstract-card p {
    margin-bottom: 10px;
    line-height: 1.7;
    color: var(--text);
    font-size: 0.95em;
}

.abstract-card p:last-child {
    margin-bottom: 0;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

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

.toc {
    max-width: 1100px;
    margin: 0 auto 40px auto;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.toc a {
    text-decoration: none;
    font-size: 0.9em;
    color: var(--accent);
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.toc a:hover {
    background: var(--best);
}

.group {
    max-width: 1100px;
    margin: 20px auto;
    padding: 0 20px;
}

.group h2 {
    font-size: 1.7em;
    margin-bottom: 8px;
    margin-top: 0;
    color: var(--text);
}

.group h3 {
    margin-top: 16px;
    font-size: 1.15em;
    color: var(--text);
}

.group-desc {
    color: var(--muted);
    font-size: 0.9em;
    margin-bottom: 12px;
    line-height: 1.6;
}

.sample-card {
    background: var(--card);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.sample-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
    border-color: var(--accent);
}

.sample-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 14px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
    transition: border-color var(--transition);
}

.sample-card:hover .sample-header {
    border-color: var(--accent);
}

.sample-header h4 {
    margin: 0;
    font-size: 1.05em;
    color: var(--text);
}

.sample-header span {
    color: var(--muted);
    font-size: 0.8em;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 16px;
}

th {
    padding: 10px 8px;
    font-weight: 600;
    border-bottom: 2px solid var(--accent);
    text-align: center;
    background: var(--bg);
    color: var(--text);
    font-size: 0.85em;
}

td {
    padding: 10px 8px;
    border-bottom: 1px solid var(--border);
    text-align: center;
    vertical-align: middle;
    font-size: 0.85em;
}

tbody tr {
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background: var(--accent-light);
    box-shadow: inset 0 0 10px rgba(59, 130, 246, 0.1);
}

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

tbody tr:nth-child(2n) {
    background: rgba(59, 130, 246, 0.02);
}

audio {
    width: 160px;
    height: 28px;
    outline: none;
    accent-color: var(--accent);
    cursor: pointer;
    border-radius: 4px;
    background: var(--bg);
    padding: 2px;
    transition: var(--transition);
}

audio:hover {
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.3);
}

audio::-webkit-media-controls-panel {
    background: var(--bg);
}

audio::-webkit-media-controls-play-button {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

video {
    width: 220px;
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    background: var(--bg);
    outline: 1px solid var(--border);
    transition: var(--transition);
}

video:hover {
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
    outline-color: var(--accent);
}

.media-grid {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    align-items: flex-start;
}

.media-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.media-item label {
    font-weight: 600;
    color: var(--text);
    font-size: 0.9em;
}

.asr-cell {
    text-align: left;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.85em;
    color: var(--muted);
    max-width: 400px;
    word-break: break-word;
}

tr.best {
    background: var(--best) !important;
    font-weight: 600;
}

tr.best:hover {
    background: var(--best) !important;
}

@media (max-width: 800px) {
    header h1 {
        font-size: 2em;
    }

    .group {
        padding: 0 16px;
    }

    .sample-card {
        padding: 16px;
    }

    audio {
        width: 140px;
    }

    table {
        font-size: 0.85em;
    }

    th,
    td {
        padding: 10px 8px;
    }

    .tabs {
        padding: 20px 16px;
        flex-wrap: wrap;
    }

    .tab {
        padding: 8px 16px;
        font-size: 0.9em;
    }
}

h5 {
    margin: 10px 0 4px 0;
    font-size: 0.9em;
    color: var(--text);
    font-weight: 600;
}

.mixture {
    margin-bottom: 20px;
}

/* ---------- Tab Navigation (multi-page) ---------- */

.tabs {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    gap: 8px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.tab {
    padding: 7px 14px;
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    text-decoration: none;
    font-size: 0.88em;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    position: relative;
}

.tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: var(--transition);
}

.tab:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tab:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.tab.active {
    background: var(--accent);
    color: white;
    font-weight: 600;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}