/* ============================================
   Blade Project Website - Academic Page Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Color Palette - Light elegant theme with teal accents */
    --color-bg-dark: #f8f9fa;
    --color-bg-main: #ffffff;
    --color-bg-alt: #f1f5f9;
    --color-bg-card: #ffffff;
    
    --color-accent-primary: #0d7377;
    --color-accent-secondary: #14919b;
    --color-accent-tertiary: #32a5aa;
    
    --color-text-primary: #1a202c;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    
    --color-border: rgba(13, 115, 119, 0.15);
    --color-border-hover: rgba(13, 115, 119, 0.35);
    
    /* Typography - Nunito Sans (Avenir alternative) */
    --font-display: 'Nunito Sans', 'Avenir', -apple-system, sans-serif;
    --font-body: 'Nunito Sans', 'Avenir', -apple-system, sans-serif;
    --font-serif: 'Nunito Sans', 'Avenir', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 3.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(13, 115, 119, 0.1);
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-bg-main);
    overflow-x: hidden;
}

/* Container */
.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(13, 115, 119, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(20, 145, 155, 0.06), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(50, 165, 170, 0.05), transparent),
        linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg-main) 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 100px,
            rgba(13, 115, 119, 0.03) 100px,
            rgba(13, 115, 119, 0.03) 101px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(13, 115, 119, 0.03) 100px,
            rgba(13, 115, 119, 0.03) 101px
        );
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-xs);
    animation: fadeInUp 0.8s ease-out;
}

.title-accent {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sep {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-family: var(--font-body);
    font-size: clamp(1.2rem, 3.5vw, 1.6rem);
    font-weight: 500;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    animation: fadeInUp 0.8s ease-out 0.1s backwards;
}

/* Authors & Affiliations */
.authors {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.author {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.author sup {
    color: var(--color-accent-primary);
    font-size: 0.7em;
    margin-left: 2px;
}

.author a {
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px dotted var(--color-border);
    transition: all var(--transition-fast);
}

.author a:hover {
    color: var(--color-accent-primary);
    border-bottom-color: var(--color-accent-primary);
    border-bottom-style: solid;
}

.affiliations {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xs) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out 0.3s backwards;
}

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

.affiliation sup {
    color: var(--color-accent-primary);
    font-size: 0.75em;
    margin-right: 3px;
}

/* Buttons */
.links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.65rem 1.5rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.btn i {
    font-size: 1.1rem;
}

.btn-paper {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    color: #ffffff;
    box-shadow: var(--shadow-sm), 0 0 20px rgba(13, 115, 119, 0.15);
}

.btn-paper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 30px rgba(13, 115, 119, 0.25);
}

.btn-code {
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    border-color: #e2e8f0;
}

.btn-code:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.btn-arxiv {
    background: var(--color-bg-card);
    color: var(--color-accent-primary);
    border-color: rgba(13, 115, 119, 0.2);
}

.btn-arxiv:hover {
    background: var(--color-bg-alt);
    border-color: rgba(13, 115, 119, 0.4);
    transform: translateY(-2px);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-md) 0 var(--spacing-lg);
}

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

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
    margin: var(--spacing-xs) auto 0;
    border-radius: 2px;
}

/* Teaser */
.teaser-container {
    max-width: 560px;
    margin: 0 auto var(--spacing-md);
}

.teaser-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* TL;DR */
.tldr {
    max-width: 850px;
    margin: 0 auto var(--spacing-md);
    text-align: center;
    font-family: var(--font-serif);
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--color-text-primary);
}

.tldr strong {
    font-weight: 700;
}

.tldr em {
    color: var(--color-accent-primary);
    font-style: italic;
    font-weight: 500;
}

/* Abstract */
.abstract-block {
    max-width: 900px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(13, 115, 119, 0.06) 0%, rgba(20, 145, 155, 0.03) 50%, rgba(200, 150, 100, 0.04) 100%);
    border: 1px solid rgba(13, 115, 119, 0.12);
    border-radius: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
}

.abstract-label {
    font-weight: 700;
    color: var(--color-text-primary);
}

.abstract-text {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text-secondary);
    text-align: justify;
    margin: 0;
}

.abstract-text strong:not(.abstract-label) {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* Method */
.method-content {
    text-align: center;
}

.diagram-container {
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border: 1px solid #e2e8f0;
}

.method-diagram {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.method-description {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.method-description-block {
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
}

.method-goal,
.method-summary,
.method-interplay,
.method-result,
.method-theory {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.method-goal strong,
.method-summary strong,
.method-interplay strong,
.method-result strong,
.method-theory strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.method-steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.method-step {
    background: var(--color-bg-card);
    border-radius: 12px;
    padding: var(--spacing-md);
    border: 1px solid #e2e8f0;
    box-shadow: var(--shadow-sm);
}

.method-step h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.step-color {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.step-color.blue {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.4);
}

.step-color.red {
    background: linear-gradient(135deg, #f87171, #fca5a5);
    box-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
}

.method-step p {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--color-text-secondary);
    margin: 0;
}

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

.step-likelihood {
    border-top: 3px solid #3b82f6;
}

.step-prior {
    border-top: 3px solid #f87171;
}

@media (max-width: 768px) {
    .method-steps {
        grid-template-columns: 1fr;
    }
    
    .method-description-block {
        padding: 0 var(--spacing-xs);
    }
}

/* Results */
.results-content {
    max-width: 900px;
    margin: 0 auto;
}

/* Results Figure */
.results-figure {
    margin: 0 0 var(--spacing-lg);
}

.results-figure-container {
    background: var(--color-bg-card);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border: 1px solid #e2e8f0;
    margin-bottom: var(--spacing-md);
}

.results-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.results-caption {
    background: linear-gradient(135deg, rgba(13, 115, 119, 0.06) 0%, rgba(20, 145, 155, 0.03) 50%, rgba(200, 150, 100, 0.04) 100%);
    border: 1px solid rgba(13, 115, 119, 0.12);
    border-radius: 12px;
    padding: var(--spacing-md) var(--spacing-lg);
}

.results-caption .caption-intro {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
    border-left: 3px solid var(--color-accent-primary);
    padding-left: var(--spacing-sm);
}

.results-caption .caption-detail {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin: 0;
    text-align: justify;
}

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

.results-caption .method-name {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-accent-primary);
    font-weight: 500;
}

@media (max-width: 768px) {
    .results-caption {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .results-caption .caption-intro,
    .results-caption .caption-detail {
        font-size: 0.9rem;
    }
}

.results-placeholder {
    background: var(--color-bg-alt);
    border-radius: 12px;
    padding: var(--spacing-xl);
    text-align: center;
    border: 2px dashed #cbd5e1;
}

.placeholder-text {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.placeholder-text i {
    display: block;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-secondary);
    opacity: 0.5;
}

/* Results Table */
.table-container {
    overflow-x: auto;
    margin: 0 auto;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    background: var(--color-bg-card);
    border: 1px solid #e2e8f0;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    min-width: 900px;
}

.results-table caption {
    padding: var(--spacing-md);
    text-align: left;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    background: var(--color-bg-alt);
    border-bottom: 1px solid #e2e8f0;
}

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

.results-table thead {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    color: #ffffff;
}

.results-table th {
    padding: 0.75rem 0.5rem;
    font-weight: 600;
    text-align: center;
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    white-space: nowrap;
}

.results-table th:last-child {
    border-right: none;
}

.results-table .header-group th:first-child {
    text-align: left;
    padding-left: 1rem;
}

.results-table .header-metrics th {
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(0, 0, 0, 0.1);
}

.results-table td {
    padding: 0.6rem 0.5rem;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
    border-right: 1px solid #f1f5f9;
}

.results-table td:first-child {
    text-align: left;
    padding-left: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.results-table td:last-child {
    border-right: none;
}

.results-table tbody tr:hover {
    background-color: rgba(13, 115, 119, 0.04);
}

.results-table .section-header {
    background: #f8fafc;
}

.results-table .section-header td {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    border-bottom: 2px solid #e2e8f0;
}

.results-table .section-header:hover {
    background: #f8fafc;
}

/* Highlight row for Blade results */
.results-table .highlight-row {
    background-color: #f0f0f0;
}

.results-table .highlight-row:hover {
    background-color: #e8e8e8;
}

.results-table .highlight-row td:first-child {
    font-weight: 600;
    color: var(--color-accent-primary);
}

.results-table td strong {
    color: var(--color-accent-primary);
    font-weight: 700;
}

/* Citation */
.citation-content {
    max-width: 800px;
    margin: 0 auto;
}

.citation-intro {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.bibtex-container {
    position: relative;
    background: #1e293b;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #334155;
}

.copy-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: #334155;
    color: #94a3b8;
    border: 1px solid #475569;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.copy-btn:hover {
    background: #475569;
    color: #e2e8f0;
    border-color: #64748b;
}

.copy-btn.copied {
    background: rgba(46, 160, 67, 0.2);
    color: #2ea043;
    border-color: #2ea043;
}

.bibtex {
    margin: 0;
    padding: var(--spacing-md);
    padding-right: 120px;
    overflow-x: auto;
}

.bibtex code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    color: #cbd5e1;
    white-space: pre;
}

/* Acknowledgments */
.acknowledgments-text {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.acknowledgments-text a {
    color: var(--color-accent-secondary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.acknowledgments-text a:hover {
    border-bottom-color: var(--color-accent-secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: #f1f5f9;
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid #e2e8f0;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
}

.footer a {
    color: var(--color-accent-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer i {
    margin-right: 0.3rem;
    opacity: 0.7;
}

.footer-copyright {
    font-size: 0.85rem;
    opacity: 0.7;
}

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .authors, .affiliations {
        gap: var(--spacing-xs) var(--spacing-sm);
    }
    
    .author {
        font-size: 1rem;
    }
    
    .links {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .bibtex {
        padding-right: var(--spacing-md);
        padding-top: 60px;
    }
    
    .copy-btn {
        right: 50%;
        transform: translateX(50%);
    }
    
    .table-container {
        margin: 0 calc(-1 * var(--spacing-sm));
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    
    .results-table {
        font-size: 0.8rem;
    }
    
    .results-table caption {
        font-size: 0.8rem;
        padding: var(--spacing-sm);
    }
    
    .results-table th,
    .results-table td {
        padding: 0.5rem 0.35rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    .bibtex code {
        font-size: 0.75rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .hero-bg,
    .btn,
    .copy-btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .section-alt {
        background: #f5f5f5;
    }
}