/* ============================================
   OPENCLAW — Design System & Global Styles
   ============================================ */

/* ── Tokens ── */
:root {
  /* Colors */
  --bg-base: #0a0b0f;
  --bg-surface: #0f1117;
  --bg-elevated: #14161d;
  --bg-card: #181b24;
  --bg-card-hover: #1e2230;

  --border-subtle: rgba(255,255,255,0.06);
  --border-default: rgba(255,255,255,0.10);
  --border-strong: rgba(255,255,255,0.18);

  --text-primary: #f0f2f8;
  --text-secondary: #8b929e;
  --text-muted: #565d6e;
  --text-accent: #7c8fff;

  --accent-primary: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-cyan: #22d3ee;
  --accent-green: #34d399;
  --accent-yellow: #fbbf24;
  --accent-red: #f87171;

  --gradient-hero: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --gradient-text: linear-gradient(90deg, #818cf8 0%, #22d3ee 50%, #34d399 100%);
  --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(34,211,238,0.04) 100%);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 68px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ── Typography ── */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: var(--text-6xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
p { color: var(--text-secondary); line-height: 1.75; }
code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(99,102,241,0.12);
  color: var(--accent-hover);
  padding: 0.15em 0.45em;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(99,102,241,0.2);
}

/* ── Utilities ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section { padding: var(--space-24) 0; }
.section-dark {
  background: var(--bg-surface);
  position: relative;
}
.section-dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(99,102,241,0.03) 0%, transparent 50%);
  pointer-events: none;
}
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-16);
}
.section-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.25);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.section-title {
  font-size: var(--text-4xl);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}
.section-sub {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-primary);
  color: #fff;
  padding: 0.7rem 1.5rem;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 36px rgba(99,102,241,0.4);
  transform: translateY(-1px);
}
.btn-ghost {
  color: var(--text-secondary);
  padding: 0.7rem 1.5rem;
  border: 1px solid var(--border-default);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.04);
}
.btn-outline {
  color: var(--accent-primary);
  padding: 0.7rem 1.5rem;
  border: 1px solid rgba(99,102,241,0.4);
  border-radius: var(--radius-md);
}
.btn-outline:hover {
  background: rgba(99,102,241,0.1);
  border-color: var(--accent-primary);
}
.btn-lg { padding: 0.875rem 2rem; font-size: var(--text-base); border-radius: var(--radius-lg); }
.btn-sm { padding: 0.45rem 1rem; font-size: var(--text-sm); border-radius: var(--radius-md); }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: all var(--transition-base);
}
.nav.scrolled {
  background: rgba(10, 11, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-xl);
}
.logo-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 8px rgba(99,102,241,0.6));
}
.logo-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}
.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  inset-inline: 0;
  background: rgba(10,11,15,0.98);
  backdrop-filter: blur(20px);
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
  flex-direction: column;
  gap: var(--space-2);
  z-index: 999;
}
.mobile-menu.open { display: flex; }
.mobile-link {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: color var(--transition-fast);
}
.mobile-link:hover { color: var(--text-primary); }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.12;
}
.hero-orb-1 {
  width: 700px; height: 700px;
  background: var(--accent-primary);
  top: -200px; left: -200px;
  animation: float-orb 12s ease-in-out infinite;
}
.hero-orb-2 {
  width: 500px; height: 500px;
  background: var(--accent-cyan);
  bottom: -100px; right: -100px;
  animation: float-orb 15s ease-in-out infinite reverse;
}
@keyframes float-orb {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -30px); }
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(99,102,241,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 30%, transparent 100%);
}
.hero-content {
  position: relative;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  padding: var(--space-16) 0 var(--space-8);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-accent);
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.2);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-8);
  opacity: 0;
  animation: fade-up 0.6s 0.1s ease forwards;
}
.badge-dot {
  width: 6px; height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-headline {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: var(--space-6);
  opacity: 0;
  animation: fade-up 0.7s 0.2s ease forwards;
}
.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto var(--space-8);
  line-height: 1.75;
  opacity: 0;
  animation: fade-up 0.7s 0.35s ease forwards;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 0.7s 0.5s ease forwards;
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Hero Terminal */
.hero-terminal {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 700px;
  margin: 0 auto var(--space-12);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  text-align: left;
  opacity: 0;
  animation: fade-up 0.8s 0.65s ease forwards;
}
.terminal-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.85rem 1.25rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}
.terminal-dots { display: flex; gap: var(--space-2); }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }
.terminal-title {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-left: auto;
  margin-right: auto;
  letter-spacing: 0.05em;
}
.terminal-body { padding: 1.5rem; }
.terminal-line {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.term-prompt {
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
}
.term-cmd {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
}
.term-cursor {
  width: 2px;
  height: 16px;
  background: var(--accent-primary);
  display: inline-block;
  animation: blink 1s infinite;
  margin-left: 2px;
  border-radius: 1px;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.terminal-output { display: flex; flex-direction: column; gap: 0.5rem; }
.term-out {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-left: var(--space-5);
}
.term-accent { color: var(--accent-yellow); }
.term-select { color: var(--accent-cyan); font-weight: 600; }
.term-success { color: var(--accent-green); font-weight: 600; margin-top: var(--space-2); }

/* Hero Stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 0.8s 0.8s ease forwards;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 var(--space-8);
}
.stat-num {
  font-size: var(--text-3xl);
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--space-1);
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border-default);
}

/* Compat Strip */
.compat-strip {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}
.compat-label {
  text-align: center;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}
.compat-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.compat-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.compat-item:hover {
  color: var(--text-primary);
  border-color: var(--border-default);
  transform: translateY(-2px);
}
.compat-icon { font-size: 1rem; }

/* Why Section — Problem vs */
.problem-vs {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-16);
  align-items: start;
}
.problem-col {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.problem-header {
  padding: var(--space-4) var(--space-6);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}
.problem-header.bad {
  background: rgba(248, 113, 113, 0.08);
  color: var(--accent-red);
  border-bottom: 1px solid rgba(248,113,113,0.15);
}
.problem-header.good {
  background: rgba(52, 211, 153, 0.08);
  color: var(--accent-green);
  border-bottom: 1px solid rgba(52,211,153,0.15);
}
.problem-list {
  padding: var(--space-4) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.problem-list li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
}
.bad-list li {
  background: rgba(248,113,113,0.05);
  border-left: 2px solid rgba(248,113,113,0.3);
}
.good-list li {
  background: rgba(52,211,153,0.05);
  border-left: 2px solid rgba(52,211,153,0.3);
}
.vs-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-12);
}
.vs-line {
  width: 1px;
  flex: 1;
  background: var(--border-subtle);
}
.vs-badge {
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-default);
  border-radius: 50%;
}

/* Value Props */
.value-props {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.value-card {
  padding: var(--space-6);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.value-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.value-card:hover {
  border-color: var(--border-default);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.value-card:hover::before { opacity: 1; }
.value-icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-4);
  display: block;
}
.value-card h3 {
  font-size: var(--text-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  position: relative;
}
.value-card p {
  font-size: var(--text-sm);
  line-height: 1.65;
  position: relative;
}

/* Architecture Flow */
.arch-flow {
  max-width: 760px;
  margin: 0 auto;
}
.arch-step {
  display: flex;
  gap: var(--space-6);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
}
.arch-step:hover {
  border-color: rgba(99,102,241,0.3);
  box-shadow: var(--shadow-glow);
}
.arch-step-final {
  background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(34,211,238,0.04));
  border-color: rgba(99,102,241,0.25);
}
.arch-num {
  font-size: var(--text-3xl);
  font-weight: 900;
  color: var(--text-muted);
  font-family: var(--font-mono);
  min-width: 48px;
  line-height: 1;
  padding-top: 4px;
}
.num-accent {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.arch-body h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.arch-body p {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}
.arch-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
}
.connector-line {
  width: 1px;
  height: 20px;
  background: linear-gradient(to bottom, var(--border-default), transparent);
}
.connector-arrow {
  color: var(--text-muted);
  font-size: var(--text-lg);
}

.code-block {
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-green);
  overflow-x: auto;
}
.provider-chips { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.chip {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  color: var(--accent-hover);
}
.chip-dim {
  background: rgba(255,255,255,0.04);
  border-color: var(--border-subtle);
  color: var(--text-muted);
}
.channel-row { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.channel-badge {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(34,211,238,0.08);
  border: 1px solid rgba(34,211,238,0.2);
  color: var(--accent-cyan);
}

/* File Tree */
.file-tree {
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.file-line { padding: 0.2rem 0; }
.file-line.indent { padding-left: 1.25rem; }
.file-line.indent2 { padding-left: 2.5rem; }
.file-dir { color: var(--accent-cyan); font-weight: 600; }
.file-md { color: var(--accent-hover); }
.file-comment { color: var(--text-muted); font-size: var(--text-xs); }

/* Chat Demo */
.chat-demo {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.chat-bubble {
  padding: 0.75rem 1rem;
  border-radius: 14px;
  font-size: var(--text-sm);
  max-width: 90%;
  line-height: 1.55;
}
.user-bubble {
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.25);
  color: var(--text-primary);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.agent-bubble {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.agent-indicator {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--accent-primary);
  display: block;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
}
.skill-card:hover {
  border-color: rgba(99,102,241,0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.skill-icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-3);
  display: block;
}
.skill-card h3 {
  font-size: var(--text-base);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.skill-card p {
  font-size: var(--text-sm);
  line-height: 1.6;
}
.skill-tag {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: rgba(99,102,241,0.1);
  color: var(--accent-hover);
  border: 1px solid rgba(99,102,241,0.2);
}
.skills-create-cta {
  background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(34,211,238,0.04));
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}
.skills-create-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.skills-create-inner h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.skills-create-inner p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* Use Cases Tabs */
.usecase-tabs {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-8);
}
.tab-buttons {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
}
.tab-btn {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  background: rgba(99,102,241,0.05);
}
.tab-panels { padding: var(--space-8); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.usecase-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: start;
}
.usecase-text h3 {
  font-size: var(--text-2xl);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}
.usecase-text p {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}
.usecase-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}
.usecase-list li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding-left: var(--space-5);
  position: relative;
}
.usecase-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: 700;
}
.usecase-visual {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.message-flow {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.msg-item {
  padding: 0.65rem 0.9rem;
  border-radius: 10px;
  font-size: var(--text-xs);
  line-height: 1.55;
  max-width: 92%;
}
.msg-user {
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.2);
  color: var(--text-primary);
  align-self: flex-end;
  border-bottom-right-radius: 3px;
}
.msg-agent {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  align-self: flex-start;
  border-bottom-left-radius: 3px;
}
.usecase-all-cta { text-align: center; }

/* Pitfalls */
.pitfalls-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.pitfall-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}
.pitfall-card:hover {
  border-color: rgba(251,191,36,0.3);
  transform: translateY(-3px);
}
.pitfall-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.pitfall-icon { font-size: 1.25rem; }
.pitfall-header h3 {
  font-size: var(--text-base);
  color: var(--text-primary);
}
.pitfall-card p {
  font-size: var(--text-sm);
  line-height: 1.65;
  margin-bottom: var(--space-4);
}
.pitfall-fix {
  background: rgba(52,211,153,0.06);
  border: 1px solid rgba(52,211,153,0.15);
  border-radius: var(--radius-md);
  padding: 0.65rem var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.fix-label {
  color: var(--accent-green);
  font-weight: 700;
  flex-shrink: 0;
}

/* Quick Setup CTA */
.setup-cta-block {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.setup-cta-text { margin-bottom: var(--space-10); }
.setup-steps-quick {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  text-align: left;
}
.qstep {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}
.qstep-num {
  width: 28px;
  height: 28px;
  background: var(--accent-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 3px;
  box-shadow: 0 0 12px var(--accent-glow);
}
.qstep strong {
  font-size: var(--text-sm);
  color: var(--text-primary);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}
.qstep p {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.5;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-16) 0 var(--space-8);
  background: var(--bg-surface);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}
.footer-tagline {
  font-size: var(--text-sm);
  color: var(--text-muted);
  max-width: 260px;
  margin-top: var(--space-3);
  margin-bottom: var(--space-5);
}
.footer-social {
  display: flex;
  gap: var(--space-4);
}
.social-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.social-link:hover { color: var(--accent-primary); }
.footer-col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.footer-links a:hover { color: var(--text-primary); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
}
.footer-bottom p, .footer-disclaimer {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* =====================
   SETUP PAGE
   ===================== */
.page-hero {
  padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,0.12) 0%, transparent 70%);
  top: -200px; left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}
.page-hero-tag { margin-bottom: var(--space-4); }
.page-hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}
.page-hero-sub {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* Setup Content */
.setup-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-10);
  align-items: start;
  padding-bottom: var(--space-24);
}
.setup-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-8));
}
.sidebar-nav {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.sidebar-nav-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0.5rem var(--space-3);
  margin-bottom: var(--space-2);
}
.sidebar-link {
  display: block;
  padding: 0.5rem var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}
.sidebar-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.04);
}
.sidebar-link.active {
  color: var(--accent-primary);
  background: rgba(99,102,241,0.08);
  border-left-color: var(--accent-primary);
}
.setup-content { min-width: 0; }
.setup-step-section {
  margin-bottom: var(--space-16);
  scroll-margin-top: calc(var(--nav-height) + var(--space-5));
}
.step-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.step-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent-primary);
  color: #fff;
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 800;
  flex-shrink: 0;
  box-shadow: 0 0 16px var(--accent-glow);
}
.step-header h2 {
  font-size: var(--text-2xl);
  color: var(--text-primary);
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-5);
}
.step-card h3 {
  font-size: var(--text-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}
.step-card p { font-size: var(--text-sm); line-height: 1.7; margin-bottom: var(--space-4); }
.step-card p:last-child { margin-bottom: 0; }
.terminal-window {
  background: #0d0d12;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-4) 0;
}
.terminal-window .terminal-header { padding: 0.7rem 1rem; }
.terminal-window .terminal-body {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.term-line {
  padding: 0.15rem 0;
  color: var(--text-secondary);
}
.term-line code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }
.term-line .cmd { color: var(--text-primary); }
.term-line .comment { color: var(--text-muted); }
.term-line .success { color: var(--accent-green); }
.term-line .warning { color: var(--accent-yellow); }
.term-line .prompt-sym { color: var(--accent-green); margin-right: 8px; }

.callout {
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
  display: flex;
  gap: var(--space-3);
}
.callout-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.callout-content { font-size: var(--text-sm); line-height: 1.65; }
.callout-content strong { display: block; margin-bottom: 4px; }
.callout-info {
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.2);
  color: var(--text-secondary);
}
.callout-info .callout-content strong { color: var(--accent-hover); }
.callout-warning {
  background: rgba(251,191,36,0.06);
  border: 1px solid rgba(251,191,36,0.2);
  color: var(--text-secondary);
}
.callout-warning .callout-content strong { color: var(--accent-yellow); }
.callout-danger {
  background: rgba(248,113,113,0.06);
  border: 1px solid rgba(248,113,113,0.2);
  color: var(--text-secondary);
}
.callout-danger .callout-content strong { color: var(--accent-red); }
.callout-success {
  background: rgba(52,211,153,0.06);
  border: 1px solid rgba(52,211,153,0.2);
  color: var(--text-secondary);
}
.callout-success .callout-content strong { color: var(--accent-green); }

.os-tabs { display: flex; gap: var(--space-2); margin-bottom: var(--space-3); }
.os-tab {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.os-tab.active {
  background: rgba(99,102,241,0.12);
  border-color: rgba(99,102,241,0.3);
  color: var(--accent-hover);
}
.os-content { display: none; }
.os-content.active { display: block; }

/* Docs Page */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-10);
  padding-bottom: var(--space-24);
}
.docs-content h2 {
  font-size: var(--text-3xl);
  color: var(--text-primary);
  margin: var(--space-10) 0 var(--space-4);
  scroll-margin-top: calc(var(--nav-height) + var(--space-5));
}
.docs-content h2:first-child { margin-top: 0; }
.docs-content h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin: var(--space-6) 0 var(--space-3);
}
.docs-content p {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  line-height: 1.75;
}
.docs-content ul {
  list-style: disc;
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}
.docs-content ul li {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: var(--space-1) 0;
  line-height: 1.65;
}

/* FAQ */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border-subtle);
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--space-5) 0;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  cursor: pointer;
  transition: color var(--transition-fast);
}
.faq-question:hover { color: var(--accent-primary); }
.faq-chevron {
  font-size: var(--text-xl);
  color: var(--text-muted);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer-inner {
  padding: 0 0 var(--space-5);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.75;
}

/* Use Cases Page */
.usecase-hero-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}
.usecase-full-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: all var(--transition-base);
  scroll-margin-top: calc(var(--nav-height) + var(--space-5));
}
.usecase-full-card:hover {
  border-color: rgba(99,102,241,0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.uc-card-icon { font-size: 2.5rem; }
.uc-card-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
}
.uc-card-title {
  font-size: var(--text-xl);
  color: var(--text-primary);
}
.uc-card-desc {
  font-size: var(--text-sm);
  line-height: 1.7;
}
.uc-card-tasks {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.uc-task-item {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.uc-task-item::before {
  content: '✓';
  color: var(--accent-green);
  font-weight: 800;
  font-size: 0.7rem;
}

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .setup-layout { grid-template-columns: 1fr; }
  .setup-sidebar { position: static; }
  .docs-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  .hero-terminal { max-width: 100%; }
  .hero-stats { gap: var(--space-4); }
  .stat-divider { display: none; }
  .problem-vs { grid-template-columns: 1fr; }
  .vs-divider { flex-direction: row; padding: 0; padding-block: var(--space-2); }
  .vs-line { height: 1px; width: auto; flex: 1; }
  .value-props { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .pitfalls-grid { grid-template-columns: 1fr; }
  .setup-steps-quick { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .usecase-content { grid-template-columns: 1fr; }
  .usecase-hero-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .section { padding: var(--space-16) 0; }
  .section-title { font-size: var(--text-3xl); }
  .hero-headline { font-size: var(--text-4xl); }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .skills-grid { grid-template-columns: 1fr; }
  .setup-steps-quick { grid-template-columns: 1fr; }
  .tab-buttons { flex-direction: column; }
  .footer-bottom { flex-direction: column; gap: var(--space-2); }
}

/* Scroll animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Progress bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
  z-index: 9999;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--accent-glow);
}