/* ============================================
   Use Case Arms Race - Main Stylesheet
   Evil Brain Labs Production System
   ============================================ */

:root {
    /* Colors - Light & Hopeful Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-accent: #f0f4f8;
    --border-color: #e2e8f0;
    --brain-accent: #3b82f6;
    --brain-purple: #8b5cf6;
    --brain-cyan: #06b6d4;
    --brain-green: #10b981;
    --brain-orange: #f59e0b;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    height: 96px;
    width: auto;
    max-width: 480px;
    max-height: 96px;
    object-fit: contain;
    display: block;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--brain-accent), var(--brain-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--text-primary);
}

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

.hero {
    padding: var(--space-2xl) 0;
    text-align: center;
}

.hero-badge {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.badge-evil {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-color: var(--brain-accent);
    color: var(--brain-accent);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--text-primary), var(--brain-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: 1.5;
}

.video-container {
    max-width: 800px;
    margin: 0 auto var(--space-xl);
    aspect-ratio: 16 / 9;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

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

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
    opacity: 0.5;
}

.video-placeholder p {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.video-placeholder small {
    font-size: 0.875rem;
    opacity: 0.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    padding: var(--space-xl);
    background: var(--bg-accent);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    margin-top: var(--space-xl);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--brain-accent), var(--brain-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.about {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--space-xl);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.about-card {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.about-card:hover {
    transform: translateY(-4px);
    border-color: var(--brain-accent);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.1);
}

.card-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--space-md);
}

.about-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Episodes Section
   ============================================ */

.episodes {
    padding: var(--space-2xl) 0;
}

.episodes h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.episode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
    max-height: 800px;
    overflow-y: auto;
    padding: var(--space-xs);
}

.episode-grid::-webkit-scrollbar {
    width: 8px;
}

.episode-grid::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.episode-grid::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.episode-grid::-webkit-scrollbar-thumb:hover {
    background: var(--brain-accent);
}

.episode-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.episode-card:hover {
    transform: translateY(-4px);
    border-color: var(--brain-purple);
    box-shadow: 0 10px 20px rgba(139, 92, 246, 0.1);
}

.episode-thumbnail {
    aspect-ratio: 16 / 9;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.episode-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.episode-info {
    padding: var(--space-md);
}

.episode-info h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    line-height: 1.3;
}

.episode-info p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.episode-date {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.submit {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
}

.submit h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.submit-form {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-xl);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brain-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    background: var(--brain-accent);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    background: var(--brain-purple);
    transform: translateY(-2px);
}

.btn-primary {
    width: 100%;
    justify-content: center;
}

.btn-arrow {
    font-size: 1.25rem;
}

.form-note {
    margin-top: var(--space-md);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.5;
}

.submit-success {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-xl);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--brain-green);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.success-icon {
    display: block;
    font-size: 3rem;
    margin-bottom: var(--space-md);
    color: var(--brain-green);
}

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

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: var(--space-sm);
}

.footer-brand a {
    color: var(--brain-accent);
    text-decoration: none;
}

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

.footer-links h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: var(--space-xs);
    transition: color 0.2s;
}

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

.footer-newsletter h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
}

.footer-newsletter p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
}

.newsletter-form {
    display: flex;
    gap: var(--space-xs);
}

.newsletter-form input {
    flex: 1;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.newsletter-form button {
    padding: var(--space-xs) var(--space-md);
    background: var(--brain-accent);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background 0.2s;
}

.newsletter-form button:hover {
    background: var(--brain-purple);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-bottom p {
    margin-bottom: var(--space-xs);
}

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

@media (max-width: 768px) {
    .nav {
        display: none; /* TODO: Mobile menu */
    }

    .logo-icon {
        height: 60px;
        max-width: 240px;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

/* ============================================
   Animations
   ============================================ */

@keyframes glow {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.logo-icon {
    animation: glow 3s ease-in-out infinite;
}