/* ============================================
   CORTICAL - Anthropic-Inspired Design System
   ============================================ */

/* Import Clash Display font */
@import url('https://api.fontshare.com/v2/css?f[]=clash-display@400,500,600,700&display=swap');

/* CSS Variables */
:root {
    --color-bg: #f5f1eb;
    --color-bg-alt: #ebe7e0;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-accent: #c4785a;
    --color-accent-dark: #a65d42;
    --color-card-beige: #e8e4dc;
    --color-card-lavender: #dcd8e8;
    --color-card-gray: #e0e0e0;
    --color-footer-bg: #2a2520;
    --color-white: #ffffff;
    --color-border: #d4d0c8;
    --color-selection: #e8a87c;

    --font-primary: Georgia, 'Times New Roman', serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --spacing-3xl: 8rem;

    --max-width: 1200px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Text selection styling */
::selection {
    background-color: var(--color-selection);
    color: var(--color-text);
}

::-moz-selection {
    background-color: var(--color-selection);
    color: var(--color-text);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--color-text);
}

.logo svg {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-accent);
}

.nav-dropdown {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-arrow {
    font-size: 0.75rem;
    transition: var(--transition);
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    padding: 0.625rem 1.25rem;
    background-color: var(--color-text);
    color: var(--color-white);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-1px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 0.625rem 1.25rem;
    background-color: transparent;
    color: var(--color-text);
    font-size: 0.9375rem;
    font-weight: 500;
    border: 1px solid var(--color-text);
    border-radius: 6px;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: var(--color-text);
    color: var(--color-white);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-lg);
}

.hero-content .underline {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text);
    line-height: 1.7;
    max-width: 540px;
}

.hero-illustration {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-illustration svg {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Featured Product Section
   ============================================ */
.featured-product {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
}

.product-card {
    background-color: var(--color-card-beige);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.product-info h2 {
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.product-info p {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.product-links {
    display: flex;
    flex-direction: column;
}

.links-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.link-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-top: 1px solid rgba(0,0,0,0.1);
    font-weight: 500;
    transition: var(--transition);
}

.link-item:last-child {
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.link-item:hover {
    color: var(--color-accent);
}

.link-item .arrow {
    font-size: 1.25rem;
    transition: var(--transition);
}

.link-item:hover .arrow {
    transform: translateX(4px);
}

/* ============================================
   Quote Section
   ============================================ */
.quote-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.video-placeholder {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: linear-gradient(135deg, #8b7355 0%, #a08060 50%, #c4a070 100%);
    aspect-ratio: 16/10;
}

.video-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
}

.video-overlay h3 {
    color: var(--color-white);
    font-size: 2.5rem;
    font-weight: 400;
    text-align: center;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.play-button {
    width: 60px;
    height: 60px;
    background-color: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.play-button:hover {
    background-color: rgba(255,255,255,0.3);
    transform: scale(1.1);
}

.quote-content {
    padding: var(--spacing-lg);
}

.quote-mark {
    font-size: 4rem;
    line-height: 1;
    color: var(--color-text);
    font-family: Georgia, serif;
}

.quote-text {
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.4;
    color: var(--color-text);
}

/* ============================================
   Mission Section
   ============================================ */
.mission-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.mission-intro {
    position: relative;
}

.section-line {
    width: 60px;
    height: 4px;
    background-color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.mission-intro h2 {
    font-size: 1.75rem;
    font-weight: 500;
    line-height: 1.4;
}

.mission-content p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
}

/* ============================================
   Feature Cards
   ============================================ */
.feature-cards {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.card {
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

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

.card-beige {
    background-color: var(--color-card-beige);
}

.card-lavender {
    background-color: var(--color-card-lavender);
}

.card-gray {
    background-color: var(--color-card-gray);
}

.card-illustration {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
}

/* ============================================
   Featured Articles
   ============================================ */
.featured-articles {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
}

.featured-articles h2 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
}

.articles-list {
    display: flex;
    flex-direction: column;
}

.article-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--spacing-xl);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    align-items: center;
    transition: var(--transition);
}

.article-item:last-child {
    border-bottom: 1px solid var(--color-border);
}

.article-item:hover {
    color: var(--color-accent);
}

.article-title {
    font-weight: 500;
}

.article-category {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.article-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-3xl);
}

.footer-logo svg {
    opacity: 0.9;
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.footer-column a {
    display: block;
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--spacing-xs);
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: var(--spacing-3xl) auto 0;
    padding: var(--spacing-lg) var(--spacing-lg) 0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
}

.footer-bottom .entity-branding {
    font-family: 'Clash Display', -apple-system, sans-serif;
    font-weight: 600;
    color: rgba(255,255,255,0.7);
    transition: color 0.3s ease;
}

.footer-bottom .entity-branding:hover {
    color: #ffffff;
}

/* ============================================
   Page Headers (for subpages)
   ============================================ */
.page-header {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-2xl);
}

.page-header h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.page-header p {
    font-size: 1.25rem;
    color: var(--color-text);
    max-width: 700px;
}

/* ============================================
   Content Sections
   ============================================ */
.content-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-3xl);
}

.content-section h2 {
    font-size: 1.75rem;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.content-card {
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    transition: var(--transition);
}

.content-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.content-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.content-card p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Team Grid */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.team-member {
    text-align: center;
}

.team-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-card-beige), var(--color-card-lavender));
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--color-text);
}

.team-member h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.team-member p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Product Features */
.product-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.feature h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Research Papers */
.papers-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.paper-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.paper-item:hover {
    background-color: var(--color-card-beige);
}

.paper-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.paper-info p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.paper-meta {
    text-align: right;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-illustration {
        order: -1;
    }

    .hero-subtitle {
        margin: 0 auto;
    }

    .product-card {
        grid-template-columns: 1fr;
    }

    .quote-section {
        grid-template-columns: 1fr;
    }

    .mission-section {
        grid-template-columns: 1fr;
    }

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

    .footer-columns {
        grid-template-columns: repeat(3, 1fr);
    }

    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-features {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    .article-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .footer-container {
        grid-template-columns: 1fr;
    }

    .footer-columns {
        grid-template-columns: repeat(2, 1fr);
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

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

@media (max-width: 480px) {
    .footer-columns {
        grid-template-columns: 1fr;
    }

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

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