/* ============================================
   Stream-Voice-Anon Demo Page Stylesheet
   Modern Academic Design
   ============================================ */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #4A90E2;
    --secondary-color: #7B68EE;
    --accent-color: #2ECC71;
    --warning-color: #F39C12;
    --danger-color: #E74C3C;
    --text-primary: #2C3E50;
    --text-secondary: #5A6C7D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-color: #E1E8ED;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Monaco', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Layout */
    --container-width: 1400px;
    --container-width-percentage: 75%; /* 75% of viewport width */
    --border-radius: 8px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 100;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-xxl) var(--spacing-lg);
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* Authors Section */
.authors {
    margin: var(--spacing-lg) auto;
    max-width: 1100px;
}

.author-names {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    line-height: 1.5;
}

.author-names sup {
    font-size: 0.75em;
    margin-left: 0.1em;
}

.author-note {
    font-size: 0.9rem;
    font-style: italic;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.affiliations {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.affiliations sup {
    font-weight: 600;
    margin-right: 0.2em;
}

.author-emails {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.author-emails a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.author-emails a:hover {
    color: white;
    border-bottom-color: white;
}

.links-row {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-link:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.abstract {
    max-width: 1300px;
    margin: 0 auto var(--spacing-xl);
    background: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.abstract h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.abstract p {
    font-size: 1.05rem;
    line-height: 1.65;
    text-align: justify;
}

.abstract em {
    font-style: italic;
    font-weight: 500;
}

.key-contributions {
    max-width: var(--container-width);
    margin: 0 auto;
}

.key-contributions h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.contributions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.contribution-card {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: transform 0.3s ease;
}

.contribution-card:hover {
    transform: translateY(-4px);
}

.contribution-card i {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.contribution-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.contribution-card p {
    font-size: 0.95rem;
    line-height: 1.5;
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
    width: var(--container-width-percentage);
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-white);
    margin-bottom: var(--spacing-lg);
}

section:nth-child(even) {
    background: var(--bg-light);
}

section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

section > .container > p {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.subsection {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.subsection h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Audio Players
   ============================================ */

.audio-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.audio-item {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

section:nth-child(even) .audio-item {
    background: var(--bg-white);
}

.audio-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.audio-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.audio-label {
    display: inline-block;
    background: var(--bg-light);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.audio-player {
    margin-top: var(--spacing-sm);
}

.audio-player audio {
    width: 100%;
    min-width: 200px; /* Prevent audio players from becoming too small */
    height: 40px;
    outline: none;
}

@media (max-width: 768px) {
    .audio-player audio {
        min-width: 180px;
        height: 36px;
    }
}

/* Custom audio player styling (Webkit browsers) */
audio::-webkit-media-controls-panel {
    background-color: var(--bg-light);
}

audio::-webkit-media-controls-play-button,
audio::-webkit-media-controls-mute-button {
    background-color: var(--primary-color);
    border-radius: 50%;
}

/* ============================================
   Examples with Strategies
   ============================================ */

.example-wrapper {
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

section:nth-child(even) .example-wrapper {
    background: #FAFBFC;
}

.example-wrapper h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.emotion-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-left: var(--spacing-sm);
}

.emotion-tag.happy {
    background: #2ECC71;
}

.emotion-tag.fearful {
    background: #E74C3C;
}

.emotion-tag.angry {
    background: #E67E22;
}

.strategies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* ============================================
   Strategy & Delay Cards
   ============================================ */

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.card {
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: all 0.3s ease;
}

section:nth-child(even) .card {
    background: var(--bg-white);
}

.card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.card code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--primary-color);
}

/* ============================================
   Tables
   ============================================ */

.table-responsive {
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    position: relative;
    scroll-behavior: smooth;
}

/* Custom scrollbar styling */
.table-responsive::-webkit-scrollbar {
    height: 10px;
}

.table-responsive::-webkit-scrollbar-track {
    background: var(--bg-light);
    border-radius: 5px;
}

.table-responsive::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

.table-responsive::-webkit-scrollbar-thumb:hover {
    background: #3A7BC8;
}

/* Scroll hint for mobile */
.table-responsive::before {
    content: '← Swipe to see more →';
    display: none;
    position: sticky;
    left: 0;
    top: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.95) 0%, rgba(118, 75, 162, 0.95) 100%);
    color: white;
    text-align: center;
    padding: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 10;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    animation: fadeInOut 3s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

@media (max-width: 768px) {
    .table-responsive::before {
        display: block;
    }
}

table {
    width: 100%;
    min-width: 900px; /* Prevent table from collapsing on mobile */
    border-collapse: collapse;
    background: var(--bg-white);
    font-size: 0.95rem;
}

/* Audio comparison tables need more width */
.audio-comparison-table table {
    min-width: 1200px;
}

thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}


thead th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tbody td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    min-width: 150px; /* Prevent cells from becoming too narrow */
    white-space: normal; /* Allow text to wrap */
}

/* Audio player cells need more space */
.audio-comparison-table tbody td {
    min-width: 220px;
}

/* Speaker/Source column can be narrower */
tbody td:first-child {
    min-width: 120px;
}

tbody tr:hover {
    background: var(--bg-light);
}

.highlight-row {
    background: #FFF9E6;
    font-weight: 600;
}

.highlight-row:hover {
    background: #FFF3D0;
}

.highlight-column {
    background: #FFF9E6 !important;
}

thead .highlight-column {
    background: #E6B800 !important;
}

tbody tr:hover .highlight-column {
    background: #FFF3D0 !important;
}

.offline-row {
    background: #F0F0F0;
    border-top: 2px solid #999;
    border-bottom: 2px solid #999;
}

.offline-row td {
    color: #666;
    font-style: italic;
}

.offline-row:hover {
    background: #E8E8E8;
}

.improvement {
    color: var(--accent-color);
    font-weight: 600;
}

/* Subscript styling for percentage changes */
td sub {
    font-size: 0.7em;
    color: #666;
    margin-left: 0.2em;
}

.highlight-row td sub {
    color: #555;
    font-weight: normal;
}

/* Color coding for improvements/degradations in percentages */
td sub.positive {
    color: #27AE60;
    font-weight: 600;
}

td sub.negative {
    color: #E74C3C;
    font-weight: 600;
}

td sub.neutral {
    color: #999;
}

/* Arrow indicators */
.arrow-down {
    color: var(--accent-color);
}

.arrow-up {
    color: var(--danger-color);
}

/* Responsive table on mobile - Use horizontal scroll instead of card layout */
@media (max-width: 768px) {
    /* Keep tables scrollable horizontally instead of converting to cards */
    .table-responsive {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Metrics table can be smaller */
    .metrics-table {
        min-width: 700px;
        font-size: 0.85rem;
    }

    /* Audio comparison tables maintain their width */
    .audio-comparison-table table {
        min-width: 1000px;
    }

    /* Adjust padding for mobile */
    thead th,
    tbody td {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
    }
}

/* ============================================
   Badges & Labels
   ============================================ */

.badge {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

.badge-success {
    background: #D4EDDA;
    color: #155724;
    border: 1px solid #C3E6CB;
}

.badge-warning {
    background: #FFF3CD;
    color: #856404;
    border: 1px solid #FFEEBA;
}

.badge-info {
    background: #D1ECF1;
    color: #0C5460;
    border: 1px solid #BEE5EB;
}

.status-good {
    color: var(--accent-color);
}

.status-acceptable {
    color: var(--warning-color);
}

.status-excellent {
    color: #27AE60;
}

/* ============================================
   Graph Container
   ============================================ */

.latency-graph-container {
    margin: var(--spacing-xl) 0;
    width: 100%;
}

.latency-graph {
    width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    background: white;
    padding: var(--spacing-md);
}

.latency-graph-pdf {
    width: 100%;
    height: 600px;
    min-height: 500px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    background: white;
    display: block;
}

.latency-graph-pdf p {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
}

.latency-graph-pdf a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.latency-graph-pdf a:hover {
    text-decoration: underline;
}

.graph-caption {
    margin-top: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    text-align: left;
    padding: 0 var(--spacing-md);
}

.graph-caption strong {
    color: var(--text-primary);
}

/* ============================================
   Details/Summary (Collapsible)
   ============================================ */

details {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    user-select: none;
    padding: var(--spacing-sm);
    margin: calc(-1 * var(--spacing-sm));
    border-radius: var(--border-radius);
    transition: background 0.2s ease;
}

summary:hover {
    background: rgba(74, 144, 226, 0.1);
}

summary::-webkit-details-marker {
    color: var(--primary-color);
}

details[open] summary {
    margin-bottom: var(--spacing-md);
}

details ul {
    margin-left: var(--spacing-lg);
    margin-top: var(--spacing-sm);
}

details li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

details strong {
    color: var(--text-primary);
}

/* ============================================
   Resources Section
   ============================================ */

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.resource-box {
    background: var(--bg-white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
}

.resource-box i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.resource-box h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.resource-box p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.btn-primary {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #3A7BC8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Citation Box */
.citation-box {
    background: #F8F9FA;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) auto;
    max-width: 900px;
    position: relative;
}

.citation-box h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.citation-box pre {
    background: #1E1E1E;
    color: #D4D4D4;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

.copy-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #3A7BC8;
    transform: translateY(-2px);
}

.copy-btn i {
    margin-right: 0.3rem;
}

/* Links & Contact Container */
.links-contact-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.resource-links {
    margin-bottom: var(--spacing-xl);
}

.resource-list {
    list-style: none;
    padding: 0;
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 800px;
}

.resource-list li {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.05rem;
    padding: var(--spacing-sm) var(--spacing-md);
    transition: transform 0.2s ease;
}

.resource-list li:hover {
    transform: translateY(-2px);
}

.resource-list i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.resource-list a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.resource-list a:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.contact-info {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
    margin-top: var(--spacing-xl);
    text-align: center;
}

.contact-info p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.6;
}

.contact-info i {
    color: var(--primary-color);
    margin-right: var(--spacing-sm);
}

.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid var(--primary-color);
    transition: all 0.3s ease;
}

.contact-info a:hover {
    color: #3A7BC8;
    border-bottom-color: #3A7BC8;
}

/* ============================================
   Architecture Section
   ============================================ */

.architecture-section {
    background: var(--bg-white);
}

.architecture-diagrams {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) auto;
    justify-content: center;
    align-items: flex-start;
    flex-wrap: nowrap;
}

.diagram-container {
    flex: 1;
    max-width: 50%;
    min-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.architecture-img {
    width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    background: white;
    padding: var(--spacing-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.architecture-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
}

.diagram-caption {
    margin-top: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.6;
    max-width: 800px;
}

.diagram-caption strong {
    color: var(--text-primary);
    font-weight: 600;
}

.architecture-note {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    line-height: 1.6;
    text-align: left;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.architecture-note strong {
    color: var(--text-primary);
}

.architecture-note em {
    font-style: italic;
}

@media (max-width: 900px) {
    .architecture-diagrams {
        flex-direction: column;
        gap: var(--spacing-xl);
        flex-wrap: wrap;
    }

    .diagram-container {
        max-width: 100%;
        min-width: unset;
    }

    .architecture-img {
        max-width: 800px;
    }
}

@media (max-width: 768px) {
    .architecture-diagrams {
        gap: var(--spacing-lg);
    }

    .architecture-img {
        padding: var(--spacing-xs);
    }

    .diagram-caption {
        font-size: 0.85rem;
    }
}

/* ============================================
   Footer
   ============================================ */

footer {
    background: #2C3E50;
    color: white;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
}

footer p {
    margin-bottom: var(--spacing-sm);
}

footer a {
    color: #3498DB;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        font-size: 15px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .contributions-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        font-size: 14px;
        --spacing-xl: 2rem;
        --spacing-xxl: 2.5rem;
    }

    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .authors {
        max-width: 100%;
    }

    .author-names {
        font-size: 1.05rem;
    }

    .affiliations,
    .author-emails {
        font-size: 0.85rem;
    }

    .links-row {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-link {
        width: 100%;
        justify-content: center;
    }

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

    .audio-comparison {
        grid-template-columns: 1fr;
    }

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

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

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

    section h2 {
        font-size: 1.5rem;
    }

    .subsection h3 {
        font-size: 1.2rem;
    }

    .latency-graph-pdf {
        height: 400px;
        min-height: 350px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero h1 {
        font-size: 1.3rem;
    }

    .latency-graph-pdf {
        height: 300px;
        min-height: 250px;
    }

    .abstract p {
        font-size: 1rem;
    }
}

/* Print Styles */
@media print {
    .hero {
        background: white;
        color: black;
    }

    audio {
        display: none;
    }

    .btn-link,
    .btn-primary {
        border: 1px solid black;
        color: black;
    }
}