/* ==========================================================================
   WASM Gaming Landing Page - Design System & Modern CSS
   ========================================================================== */

:root {
  --bg-dark: #080911;
  --bg-card: rgba(18, 20, 36, 0.7);
  --bg-card-hover: rgba(28, 32, 58, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(139, 92, 246, 0.4);
  
  --primary: #8b5cf6;
  --primary-glow: rgba(139, 92, 246, 0.35);
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.3);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.3);
  --pink: #ec4899;
  --pink-glow: rgba(236, 72, 153, 0.3);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 25px var(--primary-glow);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

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

/* Background Canvas & Grid Glow */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

.bg-radial-gradient {
  position: fixed;
  top: -20vh;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(139, 92, 246, 0.18) 0%, rgba(6, 182, 212, 0.08) 40%, rgba(8, 9, 17, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Navigation Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(8, 9, 17, 0.8);
  border-bottom: 1px solid var(--border-glass);
  padding: 1rem 0;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--primary-glow);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}

.brand-text span {
  color: var(--cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: #fff;
}

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.btn-github:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-pill);
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #c4b5fd;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 10px var(--emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.2); }
  100% { opacity: 1; transform: scale(1); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #ffffff 30%, #a78bfa 70%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  max-width: 760px;
  margin: 0 auto 2.5rem;
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  box-shadow: 0 4px 20px var(--primary-glow);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(139, 92, 246, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Stats Counter Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-mono);
  margin-bottom: 0.25rem;
  background: linear-gradient(135deg, #fff, var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Featured Section */
.section-title-wrap {
  text-align: center;
  margin-bottom: 3rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
  margin-bottom: 5rem;
}

.featured-card {
  position: relative;
  background: linear-gradient(145deg, rgba(20, 23, 42, 0.9), rgba(12, 14, 28, 0.9));
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.featured-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: 0 15px 40px var(--primary-glow);
}

.featured-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

.featured-badge {
  background: rgba(139, 92, 246, 0.2);
  border: 1px solid var(--primary);
  color: #ddd6fe;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.featured-card h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.featured-card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #d1d5db;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

.card-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
}

.btn-card-launch {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--primary);
  color: #fff;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-card-launch:hover {
  background: #7c3aed;
  box-shadow: 0 0 15px var(--primary-glow);
}

.btn-card-repo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-card-repo:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Catalog Filter Bar */
.catalog-controls {
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.search-box {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-pill);
  padding: 0.9rem 1.5rem 0.9rem 3.25rem;
  color: #fff;
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
  backdrop-filter: blur(12px);
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 20px var(--primary-glow);
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
  width: 20px;
  height: 20px;
}

.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}

/* Projects Catalog Grid */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.system-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--cyan);
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.version-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Architecture Features */
.features-section {
  padding: 4rem 0;
  border-top: 1px solid var(--border-glass);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
  margin-bottom: 4rem;
}

.feature-item {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
}

.feature-item h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.feature-item p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Code Preview Section */
.code-section {
  background: rgba(12, 14, 28, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 5rem;
  backdrop-filter: blur(16px);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.code-tabs {
  display: flex;
  gap: 0.5rem;
}

.code-tab {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-tab:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.code-tab.active {
  background: rgba(139, 92, 246, 0.2);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.btn-copy {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-muted);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.btn-copy:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.code-block {
  background: #05060b;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #e5e7eb;
  line-height: 1.6;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: 3rem 0;
  background: rgba(4, 5, 10, 0.8);
  backdrop-filter: blur(12px);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #fff;
}

.disclaimer {
  width: 100%;
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.5rem;
}

/* Responsiveness */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.4rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .featured-grid {
    grid-template-columns: 1fr;
  }
  .catalog-grid {
    grid-template-columns: 1fr;
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}