:root {
  --bg-black: #06080B;
  --bg-primary: #0A0D14;
  --bg-surface: #101520;
  --bg-surface-elevated: #161D2B;
  --bg-terminal: #07090E;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-glow: rgba(0, 245, 160, 0.35);
  
  --text-pure: #FFFFFF;
  --text-primary: #ECEFF4;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --phosphor-green: #00F5A0;
  --phosphor-green-glow: rgba(0, 245, 160, 0.2);
  --electric-cyan: #00E5FF;
  --electric-cyan-glow: rgba(0, 229, 255, 0.2);
  --thermal-orange: #FF5C00;
  --hazard-yellow: #FFB800;
  --neon-purple: #8B5CF6;

  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;

  --ease-snappy: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 245, 160, 0.07), transparent),
    radial-gradient(circle 1000px at 80% 60%, rgba(0, 229, 255, 0.03), transparent);
}

/* Subtle architectural grid pattern */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  pointer-events: none;
  z-index: 0;
}

/* Base Container */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-pure);
}

.mono {
  font-family: var(--font-mono);
}

.accent-text-green {
  color: var(--phosphor-green);
}

.accent-text-cyan {
  color: var(--electric-cyan);
}

/* Header & Nav */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 8, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-pure);
}

.brand-logo {
  width: 32px;
  height: 32px;
  background: #0E1520;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0, 245, 160, 0.15);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.68rem;
  padding: 2px 6px;
  background: rgba(0, 245, 160, 0.12);
  color: var(--phosphor-green);
  border: 1px solid rgba(0, 245, 160, 0.3);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

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

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

/* Sound Button */
.sound-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  border-radius: 6px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.sound-toggle-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.sound-toggle-btn.active {
  border-color: var(--phosphor-green);
  color: var(--phosphor-green);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s var(--ease-snappy);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--phosphor-green);
  color: #05140D;
  box-shadow: 0 0 20px rgba(0, 245, 160, 0.25);
}

.btn-primary:hover {
  background: #26ffb2;
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(0, 245, 160, 0.4);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-primary);
  transform: translateY(-1px);
}

/* Telemetry Ribbon */
.telemetry-ribbon {
  background: #080B10;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  padding: 6px 0;
  font-family: var(--font-mono);
}

.telemetry-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.telemetry-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--phosphor-green);
  box-shadow: 0 0 8px var(--phosphor-green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  position: relative;
}

.hero-header {
  max-width: 860px;
  margin: 0 auto 48px;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.25);
  font-size: 0.78rem;
  color: var(--electric-cyan);
  font-family: var(--font-mono);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
}

.hero-title span {
  background: linear-gradient(135deg, #FFFFFF 30%, #94A3B8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Interactive Playground / Terminal in Hero */
.terminal-container {
  max-width: 1040px;
  margin: 0 auto;
  background: var(--bg-terminal);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 
    0 24px 64px -12px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: #0E121B;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.model-select {
  background: #141A26;
  border: 1px solid var(--border-subtle);
  color: var(--phosphor-green);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  outline: none;
}

.terminal-body {
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.preset-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.preset-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-pill:hover, .preset-pill.active {
  border-color: var(--phosphor-green);
  color: var(--phosphor-green);
  background: rgba(0, 245, 160, 0.06);
}

.prompt-input-row {
  display: flex;
  gap: 10px;
}

.prompt-input {
  flex: 1;
  background: #0C0F16;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.prompt-input:focus {
  border-color: var(--phosphor-green);
  box-shadow: 0 0 12px rgba(0, 245, 160, 0.15);
}

.terminal-output {
  min-height: 180px;
  max-height: 340px;
  overflow-y: auto;
  background: #080A0F;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #D1D5DB;
  white-space: pre-wrap;
  position: relative;
}

.cursor-blink {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--phosphor-green);
  vertical-align: middle;
  animation: blink 0.8s infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.terminal-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 5px;
}

.stat-chip strong {
  color: var(--phosphor-green);
  font-weight: 600;
}

/* Sections */
.section {
  padding: 90px 0;
  border-top: 1px solid var(--border-subtle);
  position: relative;
}

.section-header {
  margin-bottom: 48px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--phosphor-green);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.6;
}

/* Architecture Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.arch-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 28px;
  position: relative;
}

.arch-card.highlight {
  border-color: var(--border-glow);
  background: linear-gradient(180deg, #101622 0%, #0D121B 100%);
  box-shadow: 0 0 32px rgba(0, 245, 160, 0.05);
}

.arch-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 4px;
}

.arch-badge.bad {
  background: rgba(255, 92, 0, 0.12);
  color: var(--thermal-orange);
  border: 1px solid rgba(255, 92, 0, 0.3);
}

.arch-badge.good {
  background: rgba(0, 245, 160, 0.12);
  color: var(--phosphor-green);
  border: 1px solid rgba(0, 245, 160, 0.3);
}

.arch-title {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.arch-list {
  list-style: none;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.arch-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.arch-list li span.metric {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-pure);
}

/* Global Latency Matrix */
.matrix-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  overflow: hidden;
}

.matrix-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.matrix-row {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1.5fr 1fr;
  padding: 14px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.matrix-row:last-child {
  border-bottom: none;
}

.matrix-row.header {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  background: #0B0E14;
}

.latency-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 4px;
}

.latency-bar-fill {
  height: 100%;
  border-radius: 3px;
}

.latency-bar-fill.red {
  background: var(--thermal-orange);
}

.latency-bar-fill.green {
  background: var(--phosphor-green);
}

/* Calculator Section */
.calc-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

@media (max-width: 860px) {
  .calc-card {
    grid-template-columns: 1fr;
  }
}

.calc-slider-group {
  margin-bottom: 28px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.slider-input {
  width: 100%;
  height: 6px;
  background: #1B2232;
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--phosphor-green);
  box-shadow: 0 0 10px var(--phosphor-green);
  cursor: pointer;
}

.calc-results-box {
  background: #0A0D14;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-stat-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.9rem;
}

.calc-stat-row:last-child {
  border-bottom: none;
}

.calc-big-number {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-display);
  color: var(--phosphor-green);
}

/* Code Reference Tabs */
.code-box {
  background: var(--bg-terminal);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  overflow: hidden;
}

.code-tabs {
  display: flex;
  background: #0D1118;
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 8px;
}

.code-tab {
  padding: 12px 18px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.code-tab.active {
  color: var(--phosphor-green);
  border-bottom-color: var(--phosphor-green);
}

.code-content {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  color: #D1D5DB;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: #0E131E;
  border: 1px solid var(--border-glow);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9), 0 0 30px rgba(0, 245, 160, 0.15);
  border-radius: 12px;
  max-width: 520px;
  width: 100%;
  padding: 32px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text-pure);
}

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

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  background: #07090F;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  padding: 10px 14px;
  color: var(--text-pure);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  outline: none;
}

.form-control:focus {
  border-color: var(--phosphor-green);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  background: #05070A;
  padding: 60px 0 40px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--phosphor-green);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}