/* ==========================================================================
   u2-agent Design System & Landing Page Styles
   ========================================================================== */

:root {
  --bg-base: #06070a;
  --bg-surface: #0c0e14;
  --bg-surface-elevated: #121620;
  --bg-card: rgba(18, 22, 32, 0.7);
  --bg-card-hover: rgba(24, 30, 44, 0.85);
  
  --accent-emerald: #00ff9d;
  --accent-emerald-glow: rgba(0, 255, 157, 0.25);
  --accent-emerald-dim: rgba(0, 255, 157, 0.1);
  --accent-cyan: #00e5ff;
  --accent-cyan-dim: rgba(0, 229, 255, 0.12);
  --accent-violet: #8b5cf6;
  --accent-red: #ff3b5c;
  --accent-red-dim: rgba(255, 59, 92, 0.12);
  
  --text-main: #f0f3f8;
  --text-muted: #8b9bb4;
  --text-dim: #546279;
  
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-bright: rgba(0, 255, 157, 0.35);
  --border-card: rgba(255, 255, 255, 0.1);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base & Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

/* Background Gradients & Grid */
.bg-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  inset: 0;
  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);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 10%, #000 60%, transparent 100%);
}

.bg-glow-hero {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 550px;
  background: radial-gradient(circle at 50% 40%, rgba(0, 255, 157, 0.15) 0%, rgba(0, 229, 255, 0.08) 35%, transparent 70%);
  filter: blur(80px);
}

.bg-glow-section {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  filter: blur(100px);
  pointer-events: none;
}

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

/* Navbar */
.nav-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(6, 7, 10, 0.75);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05070a;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 0.9rem;
  box-shadow: 0 0 16px var(--accent-emerald-glow);
}

.version-badge {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(0, 255, 157, 0.3);
}

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

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

.nav-link:hover {
  color: var(--accent-emerald);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-github:hover {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 12px var(--accent-emerald-glow);
  transform: translateY(-1px);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent-emerald), #00e08b);
  color: #05070a;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 20px var(--accent-emerald-glow);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(0, 255, 157, 0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-card);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--accent-emerald-dim);
  border: 1px solid rgba(0, 255, 157, 0.3);
  border-radius: 999px;
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-bottom: 24px;
}

.hero-pill-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 157, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(0, 255, 157, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 255, 157, 0); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 24px;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title-gradient {
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-emerald) 80%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* Quick Clone Box */
.clone-bar {
  display: inline-flex;
  align-items: center;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-card);
  padding: 6px 6px 6px 16px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-emerald);
  gap: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.clone-btn {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  font-weight: 600;
  transition: background var(--transition-fast);
}

.clone-btn:hover {
  background: rgba(255, 255, 257, 0.16);
}

/* Hero Terminal Window */
.terminal-window {
  max-width: 860px;
  margin: 0 auto;
  background: #090b10;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  box-shadow: 
    0 24px 70px -10px rgba(0, 0, 0, 0.9),
    0 0 40px -10px var(--accent-emerald-glow);
  overflow: hidden;
  text-align: left;
  position: relative;
}

.terminal-header {
  background: #11141d;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

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

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-daemon-badge {
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
}

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

.terminal-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  cursor: pointer;
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}

.terminal-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.3);
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  min-height: 280px;
  max-height: 380px;
  overflow-y: auto;
  color: #cdd9e5;
}

.t-prompt {
  color: var(--accent-cyan);
  user-select: none;
}

.t-cmd {
  color: #ffffff;
  font-weight: 600;
}

.t-app-header {
  color: #a5d6ff;
  font-weight: 600;
  margin-top: 4px;
}

.t-handle {
  color: var(--accent-emerald);
  font-weight: 700;
}

.t-role {
  color: #ff7b72;
}

.t-text {
  color: #f0f6fc;
}

.t-success {
  color: var(--accent-emerald);
  font-weight: 700;
}

.t-comment {
  color: var(--text-dim);
  font-style: italic;
}

.t-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background-color: var(--accent-emerald);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

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

/* Sections General */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-emerald);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

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

/* Problem vs Solution Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: stretch;
}

.comparison-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  padding: 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color var(--transition-normal);
}

.comparison-card.card-problem {
  border-color: rgba(255, 59, 92, 0.25);
}

.comparison-card.card-problem:hover {
  border-color: rgba(255, 59, 92, 0.5);
}

.comparison-card.card-solution {
  border-color: rgba(0, 255, 157, 0.35);
  box-shadow: 0 0 40px rgba(0, 255, 157, 0.08);
}

.comparison-card.card-solution:hover {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 50px rgba(0, 255, 157, 0.16);
}

.comp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.comp-title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.comp-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.badge-red {
  background: var(--accent-red-dim);
  color: var(--accent-red);
  border: 1px solid rgba(255, 59, 92, 0.3);
}

.badge-green {
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  border: 1px solid rgba(0, 255, 157, 0.35);
}

.comp-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.metric-box {
  background: rgba(0, 0, 0, 0.3);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
}

.metric-val.val-bad { color: var(--accent-red); }
.metric-val.val-good { color: var(--accent-emerald); }

.code-preview-box {
  background: #08090d;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  height: 220px;
  overflow: hidden;
  position: relative;
  flex: 1;
}

.code-preview-box::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: linear-gradient(to top, #08090d, transparent);
  pointer-events: none;
}

.comp-footer {
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Interactive Token Savings Calculator */
.calc-container {
  margin-top: 50px;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: center;
}

.calc-info h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.calc-slider-wrapper {
  margin-top: 24px;
}

.calc-slider-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.slider-val {
  color: var(--accent-emerald);
  font-weight: 700;
  font-size: 1.1rem;
}

.custom-range {
  width: 100%;
  -webkit-appearance: none;
  height: 8px;
  background: var(--bg-surface-elevated);
  border-radius: 4px;
  outline: none;
  border: 1px solid var(--border-subtle);
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-emerald);
  cursor: pointer;
  box-shadow: 0 0 14px var(--accent-emerald-glow);
  transition: transform var(--transition-fast);
}

.custom-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.calc-results {
  background: #090b10;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 12px;
}

.calc-result-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.calc-res-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.calc-res-val {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.3rem;
}

/* How It Works Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  transition: all var(--transition-normal);
}

.step-card:hover {
  border-color: rgba(0, 255, 157, 0.4);
  transform: translateY(-4px);
}

.step-num {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.1);
  margin-bottom: 12px;
  line-height: 1;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.step-code-snip {
  background: #08090e;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-emerald);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: rgba(0, 229, 255, 0.35);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.feature-icon-wrapper {
  width: 44px;
  height: 44px;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 18px;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Interactive Playground / Simulator */
.simulator-wrapper {
  background: #080a0f;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.sim-nav {
  background: #0f131c;
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.sim-tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  padding: 14px 22px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.sim-tab.active {
  color: var(--accent-emerald);
  border-bottom-color: var(--accent-emerald);
  background: rgba(0, 255, 157, 0.04);
}

.sim-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 380px;
}

.sim-panel-left {
  padding: 28px;
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sim-panel-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.sim-panel-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.sim-cmd-box {
  background: #040508;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.sim-run-btn {
  background: var(--accent-emerald);
  color: #05070a;
  border: none;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
  box-shadow: 0 0 16px var(--accent-emerald-glow);
}

.sim-run-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 24px rgba(0, 255, 157, 0.4);
}

.sim-panel-right {
  background: #050608;
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  overflow-y: auto;
}

/* Quickstart Section */
.quickstart-steps {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.qs-step {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
}

.qs-step-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.qs-step-badge {
  font-family: var(--font-mono);
  background: var(--accent-emerald-dim);
  color: var(--accent-emerald);
  font-size: 0.78rem;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qs-step-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  padding-left: 36px;
}

.code-box {
  background: #08090e;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-left: 36px;
}

.code-box code {
  color: #fff;
}

.copy-icon-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
}

.copy-icon-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Architecture Section */
.arch-diagram {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.7);
}

.arch-node {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  transition: border-color var(--transition-fast);
}

.arch-node:hover {
  border-color: var(--accent-emerald);
}

.arch-node-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.arch-node-icon {
  font-size: 1.6rem;
}

.arch-node-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.arch-node-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.arch-connector {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.arch-line {
  width: 2px;
  height: 24px;
  background: linear-gradient(to bottom, var(--accent-emerald), var(--accent-cyan));
  margin: 0 auto;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: #040508;
  padding: 70px 0 40px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 36px;
}

.footer-desc {
  max-width: 320px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-nav {
  display: flex;
  gap: 48px;
}

.footer-col h4 {
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

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

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

.footer-col a:hover {
  color: var(--accent-emerald);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Responsive adjustments */
@media (max-width: 960px) {
  .hero-title { font-size: 2.6rem; }
  .comparison-grid { grid-template-columns: 1fr; }
  .calc-container { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .sim-content { grid-template-columns: 1fr; }
  .sim-panel-left { border-right: none; border-bottom: 1px solid var(--border-subtle); }
  .nav-links { display: none; }
}