:root {
  --bg-primary: #07090E;
  --bg-secondary: #0D111A;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 34, 52, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(99, 102, 241, 0.3);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --primary: #6366F1;
  --primary-glow: rgba(99, 102, 241, 0.25);
  --primary-hover: #4F46E5;
  --secondary: #06B6D4;
  --accent: #8B5CF6;
  --success: #10B981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --danger: #EF4444;
  --danger-glow: rgba(239, 68, 68, 0.2);
  --warning: #F59E0B;
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, #A5B4FC 0%, #818CF8 50%, #38BDF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: #A5B4FC;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}

.pill-dot {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--success);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.04);
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 14, 0.75);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-shield {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  box-shadow: 0 0 16px var(--primary-glow);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand-badge {
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--text-muted);
  margin-left: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-btn {
  padding: 8px 16px;
  font-size: 0.88rem;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 90px 0 60px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.05) 50%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 60px;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  width: 100%;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  padding: 24px 20px;
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
}

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

.metric-value {
  font-size: 2.2rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-dark {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* Simulator UI */
.simulator-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.scenario-tabs {
  display: flex;
  background: rgba(13, 17, 26, 0.85);
  border-bottom: 1px solid var(--border-subtle);
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px;
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-subtle);
  color: var(--text-muted);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.tab-btn:last-child {
  border-right: none;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

.tab-btn.active {
  background: rgba(99, 102, 241, 0.08);
  color: var(--text-primary);
  border-bottom: 2px solid var(--primary);
}

.tab-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
}

.tab-info strong {
  display: block;
  font-size: 0.95rem;
}

.tab-info small {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.sim-display {
  padding: 32px;
}

/* Sim Stage View */
.sim-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.sim-card {
  background: rgba(7, 9, 14, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.sim-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.sim-card-title {
  font-size: 0.92rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-block {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 16px;
  border-radius: var(--radius-sm);
  color: #E2E8F0;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
}

.gate-result-banner {
  margin-top: 24px;
  padding: 18px 24px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gate-blocked {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #FCA5A5;
}

.gate-passed {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #6EE7B7;
}

/* 9 Stages */
.stages-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.stage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}

.stage-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
}

.stage-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.stage-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(99, 102, 241, 0.15);
  color: #A5B4FC;
}

.stage-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.stage-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.stage-mech {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--secondary);
}

/* Scorecard Table */
.scorecard-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.scorecard-header {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(13, 17, 26, 0.9);
  border-bottom: 1px solid var(--border-subtle);
}

.scorecard-badge {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.scorecard-status {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--success);
}

.scorecard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.scorecard-table th {
  padding: 16px 24px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

.scorecard-table td {
  padding: 16px 24px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-subtle);
}

.scorecard-table code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #A5B4FC;
}

.status-pill {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.status-pass {
  background: rgba(16, 185, 129, 0.15);
  color: #34D399;
}

.status-manual {
  background: rgba(245, 158, 11, 0.15);
  color: #FBBF24;
}

.highlight-row {
  background: rgba(245, 158, 11, 0.04);
}

/* Research */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
}

.research-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--secondary);
  margin-bottom: 10px;
}

.research-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.research-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 16px;
  border-left: 2px solid var(--primary);
  padding-left: 14px;
}

.research-impl {
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  padding: 50px 0;
  border-top: 1px solid var(--border-subtle);
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 420px;
  margin-top: 8px;
}

.footer-right {
  display: flex;
  gap: 24px;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
}

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

/* Responsive */
@media (max-width: 900px) {
  .hero-title { font-size: 2.5rem; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .stages-track { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
  .sim-grid { grid-template-columns: 1fr; }
  .playground-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}

/* Interactive Playground */
.playground-wrapper {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.playground-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
}

.pg-nav-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-secondary);
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.pg-nav-btn:hover {
  background: rgba(99, 102, 241, 0.14);
  border-color: rgba(99, 102, 241, 0.4);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.pg-nav-btn.active {
  background: var(--primary) !important;
  color: #ffffff !important;
  border-color: var(--primary) !important;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.playground-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  background: #060911;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  transition: var(--transition);
  resize: vertical;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.sample-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 18px 0;
}

.chip-btn {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: #A5B4FC;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.chip-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary);
  color: #fff;
}

.pg-action-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 16px;
}

.result-card {
  background: #05070d;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  min-height: 380px;
  display: flex;
  flex-direction: column;
}

.result-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.result-card-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-content {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #E2E8F0;
  white-space: pre-wrap;
  word-break: break-word;
  background: rgba(0, 0, 0, 0.4);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
  max-height: 400px;
  overflow-y: auto;
}

/* Video Showcase Styles */
.btn-video {
  background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 20px rgba(239, 68, 68, 0.35);
}

.btn-video:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(239, 68, 68, 0.55);
  background: linear-gradient(135deg, #F87171 0%, #EF4444 100%);
}

.video-showcase-wrapper {
  background: #0D111A;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(99, 102, 241, 0.12);
  margin-top: 8px;
}

.video-player-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
  border-radius: 14px;
  overflow: hidden;
  background: #000000;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.7);
}

.video-player-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.video-meta-tags {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: #94A3B8;
  background: rgba(255, 255, 255, 0.04);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.video-yt-link {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.video-chapters-container {
  margin-top: 28px;
}

.video-chapters-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #F8FAFC;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.video-chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
}

.video-chapter-card {
  background: rgba(18, 24, 38, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 12px;
  padding: 14px 16px;
  transition: all 0.2s ease;
}

.video-chapter-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  background: rgba(26, 34, 52, 0.85);
}

.chapter-time {
  font-size: 0.78rem;
  font-weight: 700;
  color: #38BDF8;
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.chapter-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #F8FAFC;
  margin-bottom: 6px;
  line-height: 1.3;
}

.chapter-desc {
  font-size: 0.8rem;
  color: #94A3B8;
  line-height: 1.4;
}