/* Video2LoRA Project Website Stylesheet (Academic Research Style) */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    --bg-base: #FAFAFA;
    --bg-surface: #FFFFFF;
    --bg-card: #F8FAF9;
    --border-color: #E2E8F0;
    --border-hover: #CBD5E1;
    
    --primary: #1A365D;       /* Navy Blue */
    --primary-light: #EFF6FF;
    --secondary: #4C1D95;     /* Dark Purple */
    --secondary-light: #F5F3FF;
    --accent: #064E3B;        /* Dark Green */
    --accent-light: #ECFDF5;
    --warning: #78350F;       /* Dark Amber */
    --warning-light: #FEF3C7;
    
    --link-color: #3182CE;
    --text-primary: #2D3748;
    --text-secondary: #4A5568;
    --text-muted: #718096;
    
    --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    --transition-smooth: all 0.2s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.625;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: #1A202C;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

/* Hero Section */
.hero {
    padding: 5rem 0 3rem;
    text-align: center;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
}

.hero-tagline {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: var(--secondary-light);
    border: 1px solid rgba(76, 29, 149, 0.15);
    border-radius: 9999px;
    color: #5B21B6;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero h1 {
    font-size: 2.75rem;
    margin-bottom: 1.25rem;
    color: #1A202C;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 750px;
    margin: 0 auto 2.25rem;
    font-weight: 400;
    line-height: 1.5;
}

.authors {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.25rem;
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.author {
    color: var(--link-color);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.author sup {
    color: var(--text-muted);
}

.author:hover {
    text-decoration: underline;
    color: #2b6cb0;
}

.affiliations {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 2.5rem;
}

/* Button Group */
.btn-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.35rem;
    border-radius: 24px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border: 1px solid var(--primary);
}

.btn-primary:hover {
    background-color: #102A43;
    border-color: #102A43;
}

.btn-arxiv {
    background-color: #B31B1B;
    color: #ffffff;
    border: 1px solid #B31B1B;
}

.btn-arxiv:hover {
    background-color: #24292f;
    border-color: #24292f;
    color: #ffffff;
}

.btn-outline {
    background: #FFFFFF;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background-color: #F8FAFC;
    border-color: var(--border-hover);
}

.btn-github {
    background-color: #24292f;
    color: #ffffff;
    border: 1px solid #24292f;
}

.btn-github:hover {
    background-color: #1f2328;
    border-color: #1f2328;
    color: #ffffff;
}

.btn-huggingface {
    background-color: #b45309;
    color: #ffffff;
    border: 1px solid #b45309;
}

.btn-huggingface:hover {
    background-color: #92400e;
    border-color: #92400e;
    color: #ffffff;
}

/* Nav Menu */
.nav-menu {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 0.75rem 0;
}

.nav-container {
    display: flex;
    justify-content: center;
    gap: 1.75rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
    position: relative;
    padding: 0.2rem 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition-smooth);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Sections */
.section {
    padding: 4.5rem 0;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
}

.section:nth-of-type(even) {
    background-color: var(--bg-base);
}

.section-title {
    font-size: 1.85rem;
    margin-bottom: 2.5rem;
    text-align: center;
    color: #1A202C;
}

.section-title::after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    background-color: var(--primary);
    margin: 0.6rem auto 0;
    border-radius: 1.5px;
}

/* Abstract */
.abstract-container {
    max-width: 800px;
    margin: 0 auto;
}

.abstract-content {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.7;
    text-align: justify;
}

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-top: 3rem;
}

.metric-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: var(--transition-smooth);
}

.metric-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.metric-val {
    font-size: 2.25rem;
    font-weight: 800;
    font-family: var(--font-heading);
    margin-bottom: 0.35rem;
    color: var(--primary);
}

.metric-card.speedup .metric-val {
    color: var(--secondary);
}

.metric-card.generalization .metric-val {
    color: var(--warning);
}

.metric-label {
    font-size: 0.95rem;
    font-weight: 700;
    color: #1A202C;
    margin-bottom: 0.35rem;
}

.metric-desc {
    font-size: 0.825rem;
    color: var(--text-secondary);
}

/* Dual Video Architecture grid */
.videos-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: flex-start;
}

@media (max-width: 800px) {
    .videos-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

.video-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.video-card-title {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: #1A202C;
    font-family: var(--font-heading);
}

.video-card:first-child .video-card-title {
    color: var(--warning);
}

.video-card:last-child .video-card-title {
    color: var(--secondary);
}

.media-container {
    width: 100%;
    position: relative;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: #FFFFFF;
}

.media-container video {
    width: 100%;
    height: auto;
    display: block;
}

/* Methodology Steps */
.arch-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 2.5rem;
    align-items: center;
}

@media (max-width: 900px) {
    .arch-grid {
        grid-template-columns: 1fr;
    }
}

.arch-steps {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.arch-step {
    display: flex;
    gap: 1rem;
    padding: 0.85rem;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.arch-step:hover {
    background: #F8FAFC;
    border-color: var(--border-color);
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-light);
    border: 1px solid var(--primary);
    color: var(--primary);
    font-weight: bold;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1rem;
    margin-bottom: 0.15rem;
    color: #1A202C;
}

.step-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Academic Tables Tabs section */
.tabs-container {
    margin-top: 1.5rem;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 1.75rem;
}

.tab-btn {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.45rem 1.1rem;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-size: 0.85rem;
}

.tab-btn:hover {
    background: #F8FAFC;
    color: var(--primary);
    border-color: var(--border-hover);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.25s ease-in-out;
}

/* Academic Booktabs Table Style */
.table-wrapper {
    overflow-x: auto;
    margin: 1rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
    color: var(--text-primary);
    border-top: 2px solid #1A202C;
    border-bottom: 2px solid #1A202C;
}

th {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid #1A202C;
    color: #1A202C;
    font-weight: 700;
    font-size: 0.875rem;
    background: transparent;
}

td {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.badge {
    display: inline-block;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-base {
    background: var(--warning-light);
    color: var(--warning);
    border: 1px solid rgba(120, 53, 15, 0.2);
}

.badge-lora {
    background: var(--accent-light);
    color: var(--accent);
    border: 1px solid rgba(6, 78, 59, 0.2);
}

.equivalence-pass {
    color: #047857;
    font-weight: 600;
}

/* Qualitative Explorer Widget */
.explorer-widget {
    background: #FFFFFF;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.explorer-header {
    background: #F1F5F9;
    padding: 0.85rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.explorer-title {
    font-weight: 700;
    font-size: 0.95rem;
    color: #1A202C;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.explorer-nav {
    display: flex;
    gap: 0.4rem;
}

.nav-btn {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-size: 0.8rem;
}

.nav-btn:hover {
    background: #F8FAFC;
    border-color: var(--border-hover);
}

.glass-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.025);
    margin-bottom: 2rem;
    transition: var(--transition-smooth);
}

.claims-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3.5rem;
}

.explorer-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

@media (max-width: 768px) {
    .explorer-body {
        grid-template-columns: 1fr;
    }
    .claims-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.explorer-video-placeholder {
    background: #FAFAFA;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 240px;
    color: var(--text-secondary);
    position: relative;
    overflow: hidden;
}

.explorer-video-placeholder span {
    font-size: 0.8rem;
    margin-top: 0.4rem;
}

.explorer-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-bubble {
    padding: 0.85rem;
    border-radius: 6px;
    position: relative;
    font-size: 0.9rem;
}

.bubble-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.2rem;
}

.bubble-question {
    background: var(--primary-light);
    border-left: 3px solid var(--primary);
    color: var(--text-primary);
}

.bubble-question .bubble-label {
    color: var(--primary);
}

.bubble-reference {
    background: var(--warning-light);
    border-left: 3px solid var(--warning);
    color: var(--text-primary);
}

.bubble-reference .bubble-label {
    color: var(--warning);
}

.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.comp-column {
    background: #F8FAFC;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
}

.comp-column.base {
    border-top: 3px solid var(--warning);
}

.comp-column.lora {
    border-top: 3px solid var(--accent);
    background: var(--accent-light);
}

.comp-name {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.35rem;
}

.comp-column.base .comp-name {
    color: var(--warning);
}

.comp-column.lora .comp-name {
    color: var(--accent);
}

.comp-response {
    font-size: 0.875rem;
    font-weight: 600;
}

.comp-stat {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* BibTeX Section */
.bibtex-box {
    background: #F8FAFC;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    position: relative;
    overflow-x: auto;
}

.bibtex-code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    color: #1A365D;
    white-space: pre;
    display: block;
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.copy-btn:hover {
    background: #F1F5F9;
    border-color: var(--border-hover);
    color: var(--primary);
}

/* Footer */
footer {
    padding: 2.5rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    background-color: #FFFFFF;
    border-top: 1px solid var(--border-color);
}

/* Keyframes */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Nav Fixes */
@media (max-width: 600px) {
    .nav-container {
        gap: 1rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        padding: 0 1rem;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .nav-container::-webkit-scrollbar {
        display: none;
    }
    .nav-link {
        white-space: nowrap;
    }
}