/* =====================================================
   H Heuristics Research Initiative
   Academic/Scholarly Design System
   ===================================================== */

:root {
    /* Color Palette - Library/Scholarly Aesthetic */
    --color-ink: #1a1a1a;
    --color-ink-soft: #2d2d2d;
    --color-parchment: #f7f4ed;
    --color-parchment-dark: #ebe6d9;
    --color-forest: #1e3a2f;
    --color-forest-light: #2a4f40;
    --color-forest-muted: #3d6b58;
    --color-gold: #b8860b;
    --color-gold-light: #d4a84b;
    --color-sage: #7d8c7a;
    --color-burgundy: #722f37;
    --color-cream: #fffef9;
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-parchment);
    color: var(--color-ink);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Subtle paper grain texture overlay */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 1000;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Selection */
::selection {
    background: var(--color-forest);
    color: var(--color-cream);
}

/* Links */
a {
    color: var(--color-forest);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-gold);
}

/* =====================================================
   Header
   ===================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: linear-gradient(to bottom, var(--color-parchment) 0%, rgba(247, 244, 237, 0.95) 100%);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(30, 58, 47, 0.08);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-mark {
    width: 48px;
    height: 48px;
    background: var(--color-forest);
    color: var(--color-gold-light);
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    letter-spacing: -0.02em;
}

.logo-mark.small {
    width: 32px;
    height: 32px;
    font-size: 1.25rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.02em;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--color-sage);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 500;
}

.main-nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-ink-soft);
    letter-spacing: 0.02em;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-gold);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-forest);
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--space-2xl) + 80px) var(--space-lg) var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
    animation: fadeInUp 0.8s ease forwards;
}

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

.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-gold);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.hero-eyebrow::before,
.hero-eyebrow::after {
    content: '';
    width: 40px;
    height: 1px;
    background: var(--color-gold);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 500;
    line-height: 1.1;
    color: var(--color-forest);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-ink-soft);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(30, 58, 47, 0.1);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-number {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-forest);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-sage);
    font-weight: 500;
}

/* Hero Decoration */
.hero-decoration {
    position: absolute;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    width: 400px;
    height: 400px;
    opacity: 0.4;
    pointer-events: none;
}

.decoration-grid {
    width: 100%;
    height: 100%;
    position: relative;
}

.grid-line {
    position: absolute;
    background: var(--color-forest);
}

.grid-line.horizontal {
    height: 1px;
    width: 100%;
    left: 0;
}

.grid-line.horizontal:nth-child(1) { top: 20%; }
.grid-line.horizontal:nth-child(2) { top: 50%; }
.grid-line.horizontal:nth-child(3) { top: 80%; }

.grid-line.vertical {
    width: 1px;
    height: 100%;
    top: 0;
}

.grid-line.vertical:nth-child(4) { left: 30%; }
.grid-line.vertical:nth-child(5) { left: 70%; }

/* =====================================================
   Publications Section
   ===================================================== */

.publications-section {
    padding: var(--space-2xl) var(--space-lg);
    background: linear-gradient(180deg, var(--color-parchment) 0%, var(--color-cream) 100%);
}

.section-header {
    max-width: 1400px;
    margin: 0 auto var(--space-xl);
    position: relative;
}

.section-number {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gold);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    color: var(--color-forest);
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: 1.0625rem;
    color: var(--color-ink-soft);
    max-width: 600px;
}

/* Publications Grid */
.publications-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-lg);
}

/* Publication Card */
.publication-card {
    background: var(--color-cream);
    border: 1px solid rgba(30, 58, 47, 0.08);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.publication-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(30, 58, 47, 0.12);
}

.card-accent {
    height: 4px;
    background: linear-gradient(90deg, var(--color-forest) 0%, var(--color-forest-light) 50%, var(--color-gold) 100%);
}

.card-content {
    padding: var(--space-lg);
}

.publication-type {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-sage);
    display: inline-block;
    margin-bottom: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-parchment-dark);
    border-radius: 3px;
}

.publication-title {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: var(--space-md);
    line-height: 1.35;
    letter-spacing: -0.01em;
}

.publication-excerpt {
    font-size: 0.9375rem;
    color: var(--color-ink-soft);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.publication-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(30, 58, 47, 0.06);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8125rem;
    color: var(--color-sage);
}

.meta-item svg {
    opacity: 0.7;
}

/* Buttons */
.publication-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: 6px;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-forest);
    color: var(--color-cream);
}

.btn-primary:hover {
    background: var(--color-forest-light);
    color: var(--color-cream);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-forest);
    border: 1px solid rgba(30, 58, 47, 0.2);
}

.btn-secondary:hover {
    background: var(--color-forest);
    color: var(--color-cream);
    border-color: var(--color-forest);
}

.btn-accent {
    background: var(--color-gold);
    color: var(--color-ink);
}

.btn-accent:hover {
    background: var(--color-gold-light);
    color: var(--color-ink);
    transform: translateY(-1px);
}

/* =====================================================
   Infographics Section
   ===================================================== */

.infographics-section {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--color-cream);
}

.infographics-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-lg);
}

/* Infographic Card - matches publication card style */
.infographic-card {
    background: var(--color-cream);
    border: 1px solid rgba(30, 58, 47, 0.08);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.infographic-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(30, 58, 47, 0.12);
}

.infographic-preview {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--color-parchment-dark);
}

.infographic-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.infographic-card:hover .infographic-preview img {
    transform: scale(1.05);
}

.infographic-card .card-content {
    padding: var(--space-md) var(--space-lg) var(--space-lg);
}

.infographic-card .publication-meta {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(30, 58, 47, 0.06);
}

/* =====================================================
   About Section
   ===================================================== */

.about-section {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--color-forest);
    color: var(--color-cream);
    position: relative;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(184, 134, 11, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.about-section .section-header {
    position: relative;
    z-index: 2;
}

.about-section .section-number {
    color: var(--color-gold-light);
}

.about-section .section-title {
    color: var(--color-cream);
}

.about-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    position: relative;
    z-index: 2;
}

.about-text {
    max-width: 700px;
}

.about-lead {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.5;
    margin-bottom: var(--space-lg);
    color: var(--color-parchment);
}

.about-lead strong {
    color: var(--color-gold-light);
    font-weight: 500;
}

.about-text p {
    font-size: 1rem;
    line-height: 1.8;
    color: rgba(247, 244, 237, 0.85);
    margin-bottom: var(--space-md);
}

.about-principles h3 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
    color: var(--color-gold-light);
    letter-spacing: 0.05em;
}

.principles-list {
    list-style: none;
}

.principles-list li {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid rgba(247, 244, 237, 0.1);
    font-size: 0.9375rem;
    color: rgba(247, 244, 237, 0.9);
}

.principle-marker {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gold);
    width: 24px;
    flex-shrink: 0;
}

/* =====================================================
   Submit Section
   ===================================================== */

.submit-section {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--color-parchment);
}

.submit-card {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-cream);
    border: 1px solid rgba(30, 58, 47, 0.1);
    border-radius: 12px;
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-lg);
    align-items: center;
}

.submit-content h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 500;
    color: var(--color-forest);
    margin-bottom: var(--space-md);
}

.submit-content p {
    color: var(--color-ink-soft);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
    max-width: 500px;
}

.submit-decoration {
    display: flex;
    gap: var(--space-md);
    opacity: 0.15;
}

.deco-circle {
    width: 80px;
    height: 80px;
    border: 2px solid var(--color-forest);
    border-radius: 50%;
}

.deco-circle:nth-child(2) {
    width: 60px;
    height: 60px;
    margin-top: 40px;
}

.deco-circle:nth-child(3) {
    width: 40px;
    height: 40px;
    margin-top: 20px;
}

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

.site-footer {
    background: var(--color-ink);
    color: var(--color-parchment);
    padding: var(--space-xl) var(--space-lg);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-serif);
    font-size: 1rem;
}

.footer-links {
    display: flex;
    gap: var(--space-md);
    font-size: 0.875rem;
}

.footer-links a {
    color: rgba(247, 244, 237, 0.7);
}

.footer-links a:hover {
    color: var(--color-gold-light);
}

.footer-links .divider {
    color: rgba(247, 244, 237, 0.3);
}

.footer-copy {
    font-size: 0.75rem;
    color: rgba(247, 244, 237, 0.4);
}

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

@media (max-width: 1024px) {
    .hero-decoration {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .main-nav {
        gap: var(--space-md);
    }
    
    .hero {
        padding-top: calc(var(--space-2xl) + 120px);
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: var(--space-lg);
    }
    
    .publications-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .publication-actions {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
}

/* =====================================================
   Print Styles
   ===================================================== */

@media print {
    .site-header,
    .hero-decoration,
    .submit-section,
    .site-footer,
    .grain-overlay {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .publication-card {
        break-inside: avoid;
        border: 1px solid #ccc;
    }
}