/* ========================================
   CLAP Project Page Styles
   A sophisticated academic aesthetic
   Supports light/dark mode based on system preference
   ======================================== */

:root {
    /* Typography */
    --font-display: 'Outfit', sans-serif;
    --font-body: 'Crimson Pro', Georgia, serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --section-gap: 6rem;
    --content-width: 900px;
    --wide-width: 1100px;
    
    /* Default: Dark Theme - Deep ocean meets warm amber */
    --bg-primary: #0a0e14;
    --bg-secondary: #12171f;
    --bg-tertiary: #1a2029;
    --bg-card: #161b24;
    
    --text-primary: #e6edf3;
    --text-secondary: #9ba4b0;
    --text-muted: #6b7685;
    
    --accent-primary: #d4a03a;
    --accent-secondary: #c4902a;
    --accent-glow: rgba(212, 160, 58, 0.15);
    
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(212, 160, 58, 0.3);
    
    --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(212, 160, 58, 0.08), transparent),
                     radial-gradient(ellipse 60% 40% at 80% 60%, rgba(99, 102, 241, 0.04), transparent);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --grain-opacity: 0.03;
}

/* Light Theme */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #faf9f7;
        --bg-secondary: #f0eeea;
        --bg-tertiary: #e8e5e0;
        --bg-card: #ffffff;
        
        --text-primary: #1a1a1a;
        --text-secondary: #4a4a4a;
        --text-muted: #7a7a7a;
        
        --accent-primary: #b8860b;
        --accent-secondary: #9a7209;
        --accent-glow: rgba(184, 134, 11, 0.12);
        
        --border-subtle: rgba(0, 0, 0, 0.08);
        --border-accent: rgba(184, 134, 11, 0.35);
        
        --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(184, 134, 11, 0.06), transparent),
                         radial-gradient(ellipse 60% 40% at 80% 60%, rgba(99, 102, 241, 0.03), transparent);
        --shadow-color: rgba(0, 0, 0, 0.08);
        --grain-opacity: 0.015;
    }
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Grain Overlay for texture */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: var(--grain-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 100vh;
    background: var(--gradient-hero);
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: var(--wide-width);
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* ========================================
   Hero / Title Section
   ======================================== */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out;
}

.title-wrapper {
    margin-bottom: 1.5rem;
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--text-primary);
}

.title-accent {
    color: var(--accent-primary);
    text-shadow: 0 0 40px var(--accent-glow);
}

.title-separator {
    color: var(--text-muted);
    margin: 0 0.1em;
}

.subtitle {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    letter-spacing: 0.02em;
}

.title-line {
    width: 120px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    margin: 0 auto;
    border-radius: 2px;
}

/* ========================================
   Authors Section
   ======================================== */
.authors {
    text-align: center;
    margin-bottom: var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.1s backwards;
}

.author-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 1.5rem;
    margin-bottom: 1rem;
}

.author {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.author:hover {
    color: var(--accent-primary);
}

.author sup {
    color: var(--accent-primary);
    font-size: 0.7em;
    margin-left: 0.1em;
}

.author.corresponding {
    position: relative;
}

.author.corresponding::after {
    content: '✉';
    font-size: 0.75em;
    margin-left: 0.3em;
    opacity: 0.7;
}

.affiliations {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem 2rem;
    margin-bottom: 0.75rem;
}

.affiliation {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.affiliation sup {
    color: var(--accent-primary);
    font-size: 0.75em;
}

.author-notes {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.8;
}

.author-note {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.author-note sup {
    color: var(--accent-primary);
    font-size: 0.9em;
}

.links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.link-btn svg {
    width: 18px;
    height: 18px;
}

.link-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-accent);
    color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--shadow-color);
}

/* ========================================
   Video Section
   ======================================== */
.video-section {
    margin-bottom: var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.video-container {
    max-width: var(--content-width);
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.video-container iframe {
    width: 100%;
    height: 100%;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    color: var(--text-muted);
}

.video-placeholder svg {
    width: 64px;
    height: 64px;
    opacity: 0.5;
}

.video-fallback {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.video-fallback a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.video-fallback a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

/* ========================================
   TL;DR Section
   ======================================== */
.tldr-section {
    max-width: var(--content-width);
    margin: 0 auto var(--section-gap);
    padding: 2rem 2.5rem;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-tertiary));
    border: 1px solid var(--border-accent);
    border-radius: 12px;
    position: relative;
    animation: fadeInUp 0.8s ease-out 0.3s backwards;
}

.tldr-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px 12px 0 0;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.tldr-content {
    font-size: 1.15rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.tldr-content strong {
    color: var(--accent-primary);
}

/* ========================================
   Section Titles
   ======================================== */
.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent-primary);
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* ========================================
   Abstract Section
   ======================================== */
.abstract-section {
    max-width: var(--content-width);
    margin: 0 auto var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.abstract-content {
    text-align: justify;
    hyphens: auto;
}

.abstract-content p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

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

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

.abstract-content em {
    font-style: italic;
    color: var(--accent-primary);
}

/* ========================================
   Method Section
   ======================================== */
.method-section {
    margin-bottom: var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

.method-content {
    max-width: var(--wide-width);
    margin: 0 auto;
}

.method-diagram {
    margin-bottom: 3rem;
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
}

.method-diagram img {
    width: 100%;
    height: auto;
    display: block;
}

.diagram-placeholder {
    padding: 4rem;
    text-align: center;
    color: var(--text-muted);
    font-family: var(--font-display);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    background: var(--bg-tertiary);
}

.method-description {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.method-block {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.method-block:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--shadow-color);
}

.method-block h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.method-block p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

.method-block strong {
    color: var(--text-primary);
}

/* ========================================
   Experiments Carousel
   ======================================== */
.experiments-section {
    margin-bottom: var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.carousel-container {
    max-width: var(--content-width);
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.carousel-viewport {
    flex: 1;
    overflow: hidden;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-slide {
    flex: 0 0 100%;
    opacity: 0.5;
    transition: opacity 0.5s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.slide-content {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.slide-content img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slide-content img.placeholder {
    background: var(--bg-tertiary);
    object-fit: none;
}

.slide-caption {
    padding: 1.25rem 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-subtle);
    min-height: 100px;
}

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

/* Model Tags for Experiment Videos */
.model-tag {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    margin-right: 0.75rem;
    vertical-align: middle;
}

.model-tag.ntp {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.4);
}

.model-tag.rf {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(52, 211, 153, 0.2));
    color: #34d399;
    border: 1px solid rgba(52, 211, 153, 0.4);
}

.speedup-tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    margin-left: 0.5rem;
}

/* Light theme adjustments for model tags */
@media (prefers-color-scheme: light) {
    .model-tag.ntp {
        background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
        color: #7c3aed;
        border: 1px solid rgba(139, 92, 246, 0.3);
    }
    
    .model-tag.rf {
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(52, 211, 153, 0.15));
        color: #059669;
        border: 1px solid rgba(52, 211, 153, 0.3);
    }
}

/* Video styling in slides */
.slide-content video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    background: var(--bg-secondary);
}

/* Custom video controls styling */
.slide-content video::-webkit-media-controls-panel {
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
}

.slide-content video::-webkit-media-controls-current-time-display,
.slide-content video::-webkit-media-controls-time-remaining-display {
    color: #fff;
}

.carousel-btn {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-btn svg {
    width: 24px;
    height: 24px;
}

.carousel-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-accent);
    color: var(--accent-primary);
    transform: scale(1.1);
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.dot {
    width: 10px;
    height: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot:hover {
    background: var(--text-muted);
}

.dot.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.2);
}

/* ========================================
   Results Section
   ======================================== */
.results-section {
    margin-bottom: var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.7s backwards;
}

.results-grid {
    max-width: var(--content-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.result-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.result-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--shadow-color);
}

.result-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.result-label {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.result-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ========================================
   Citation Section
   ======================================== */
.citation-section {
    max-width: var(--content-width);
    margin: 0 auto var(--section-gap);
    animation: fadeInUp 0.8s ease-out 0.8s backwards;
}

.citation-block {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    overflow: hidden;
}

.citation-block pre {
    padding: 1.5rem;
    overflow-x: auto;
}

.citation-block code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.copy-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.copy-btn svg {
    width: 14px;
    height: 14px;
}

.copy-btn:hover {
    color: var(--accent-primary);
    border-color: var(--border-accent);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    text-align: center;
    padding-top: 3rem;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.template-credit {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.6;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    :root {
        --section-gap: 4rem;
    }
    
    .container {
        padding: 2rem 1rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .author-list {
        gap: 0.25rem 1rem;
    }
    
    .author {
        font-size: 0.95rem;
    }
    
    .links {
        flex-direction: column;
        align-items: center;
    }
    
    .link-btn {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
    
    .tldr-section {
        padding: 1.5rem;
    }
    
    .carousel-container {
        gap: 0.5rem;
    }
    
    .carousel-btn {
        width: 40px;
        height: 40px;
    }
    
    .carousel-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .slide-caption {
        padding: 1rem 1.25rem;
        font-size: 0.9rem;
    }
    
    .result-number {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .carousel-container {
        position: relative;
    }
    
    .carousel-btn.prev,
    .carousel-btn.next {
        position: absolute;
        top: 35%;
        transform: translateY(-50%);
        z-index: 10;
        width: 36px;
        height: 36px;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .carousel-btn.prev:hover,
    .carousel-btn.next:hover {
        background: rgba(0, 0, 0, 0.7);
    }
    
    .carousel-btn svg {
        width: 18px;
        height: 18px;
    }
    
    .carousel-btn.prev {
        left: 0.5rem;
    }
    
    .carousel-btn.next {
        right: 0.5rem;
    }
    
    .slide-caption {
        padding: 1rem;
        font-size: 0.85rem;
        line-height: 1.5;
        min-height: auto;
    }
    
    .model-tag {
        display: block;
        width: fit-content;
        margin-bottom: 0.5rem;
        margin-right: 0;
    }
    
    .speedup-tag {
        display: inline-block;
        margin-left: 0;
        margin-top: 0.5rem;
    }
}

/* Selection styling */
::selection {
    background: var(--accent-primary);
    color: #ffffff;
}

/* Smooth theme transition */
body,
.container,
.link-btn,
.video-container,
.tldr-section,
.method-block,
.carousel-viewport,
.slide-caption,
.carousel-btn,
.dot,
.result-card,
.citation-block,
.copy-btn {
    transition: background-color 0.3s ease, 
                border-color 0.3s ease, 
                color 0.3s ease,
                box-shadow 0.3s ease;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Color scheme meta */
:root {
    color-scheme: dark light;
}