/* 
 * OpenUTV — Landing Page Stylesheet
 * High-performance VFX dark theme with modern CSS tokens
 */

:root {
  --bg-main: #0b0e14;
  --bg-card: #121721;
  --bg-card-hover: #171e2b;
  --bg-elevated: #1a2232;
  --border: #222d3d;
  --border-focus: #38bdf8;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #38bdf8;
  --accent-blue: #6366f1;
  --accent-violet: #818cf8;
  --accent-emerald: #10b981;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #7dd3fc;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 14, 20, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  border: 1px solid var(--border);
  color: var(--text-main) !important;
  transition: all 0.2s ease;
}

.btn-github:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
  transform: translateY(-1px);
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.75rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem 1.75rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  color: #0b0e14;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.45);
  color: #000;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--border-focus);
  color: #fff;
}

/* Mockup UI */
.player-mockup {
  max-width: 980px;
  margin: 0 auto;
  background: #0d1117;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 40px rgba(56, 189, 248, 0.1);
  overflow: hidden;
  text-align: left;
}

.mockup-header {
  background: #161b22;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.window-buttons {
  display: flex;
  gap: 6px;
}

.win-btn {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.win-close { background: #ff5f56; }
.win-min { background: #ffbd2e; }
.win-max { background: #27c93f; }

.mockup-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.mockup-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.mockup-viewport {
  position: relative;
  background: #000;
}

.mockup-screen {
  aspect-ratio: 16 / 9;
  background: radial-gradient(circle at center, #1b2735 0%, #090a0f 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.color-scope-overlay {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  gap: 0.5rem;
}

.scope-tag {
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #38bdf8;
}

.crosshair {
  width: 40px;
  height: 40px;
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: inline-block;
}

.timeline-bar {
  background: #111620;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
}

.timeline-progress {
  height: 6px;
  background: #1e293b;
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.timeline-progress::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 65%;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
}

.timeline-info {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.timecode {
  color: var(--text-muted);
}

/* Sections General */
.section {
  padding: 5rem 0;
}

.section-dark {
  background: #07090e;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

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

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.2s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #fff;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Install Card & Tabs */
.install-card {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.tabs-header {
  display: flex;
  background: #111620;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 1rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.05);
}

.tabs-content {
  padding: 2rem;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.code-box {
  background: #080a0f;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
  background: #111620;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.btn-copy {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

pre {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  overflow-x: auto;
  color: #e2e8f0;
  line-height: 1.5;
}

.install-hint {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Direct Releases Grid */
.direct-download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.download-link-card {
  background: #0d121c;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-align: center;
  transition: all 0.2s ease;
}

.download-link-card:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.dl-os {
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.25rem;
}

.dl-file {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Pipeline Split */
.pipeline-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.pipeline-text h2 {
  text-align: left;
}

.pipeline-text p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.pipeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.pipeline-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.pipeline-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: 700;
}

.pipeline-list strong {
  color: #fff;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  background: #080a0f;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.footer-copy {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

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

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 1rem 0;
    gap: 1rem;
  }
  .pipeline-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}