:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #21262d;
  --fg: #e6edf3;
  --fg-muted: #7d8590;
  --accent: #00c9a7;
  --accent-dim: rgba(0,201,167,0.12);
  --accent-glow: rgba(0,201,167,0.25);
  --danger: #ff6b6b;
  --danger-dim: rgba(255,107,107,0.15);
  --success: #56d364;
  --success-dim: rgba(86,211,100,0.15);
  --radius: 10px;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Dot grid atmosphere */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.04) 1px, transparent 0);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* Nav */
.nav {
  position: relative;
  z-index: 10;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}
.nav-tagline {
  color: var(--fg-muted);
  font-size: 0.875rem;
}

/* Sections */
section { position: relative; z-index: 1; }

/* Hero */
.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 2rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}
.hero-lede {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 480px;
}

/* Monitor card */
.monitor-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,201,167,0.08) inset;
}
.monitor-header {
  background: var(--surface-2);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.monitor-dot { width: 10px; height: 10px; border-radius: 50%; }
.monitor-dot.red { background: #ff5f57; }
.monitor-dot.yellow { background: #febc2e; }
.monitor-dot.green { background: #28c840; }
.monitor-url { font-family: monospace; font-size: 0.75rem; color: var(--fg-muted); margin-left: 0.5rem; flex: 1; }
.monitor-badge {
  background: var(--danger-dim);
  color: var(--danger);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}
.diff-block { padding: 1.25rem 1rem; border-bottom: 1px solid rgba(255,255,255,0.05); }
.diff-line { font-family: monospace; font-size: 0.9rem; padding: 0.2rem 0; }
.diff-line.removed { color: var(--danger); text-decoration: line-through; opacity: 0.7; }
.diff-line.added { color: var(--accent); }
.monitor-meta {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.alert-icon::before {
  content: '⚡';
  color: var(--accent);
  font-size: 0.9rem;
}

/* How */
.how {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 3.5rem;
  letter-spacing: -0.02em;
  max-width: 600px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}
.step-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: rgba(0,201,167,0.15);
  display: block;
  margin-bottom: 1rem;
  line-height: 1;
}
.step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.6rem;
}
.step p { font-size: 0.9rem; color: var(--fg-muted); line-height: 1.65; }

/* Features */
.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.2s;
}
.feature:hover { border-color: rgba(0,201,167,0.3); }
.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--accent);
}
.feature h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; }
.feature p { font-size: 0.85rem; color: var(--fg-muted); line-height: 1.6; }

/* Diff demo */
.diff-demo {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.diff-demo-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  align-items: stretch;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.5rem;
}
.diff-left, .diff-right { padding: 1.5rem; flex: 1; }
.diff-left { border-right: 1px solid rgba(255,255,255,0.06); }
.diff-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 1rem;
}
.diff-label-old { background: var(--danger-dim); color: var(--danger); }
.diff-label-new { background: var(--success-dim); color: var(--success); }
.diff-code { font-family: 'Courier New', monospace; font-size: 0.8rem; line-height: 1.8; }
.diff-line-plain { color: var(--fg-muted); }
.diff-line-highlight-red { color: var(--danger); background: rgba(255,107,107,0.06); padding: 0 0.3rem; border-radius: 3px; }
.diff-line-highlight-green { color: var(--accent); background: rgba(0,201,167,0.06); padding: 0 0.3rem; border-radius: 3px; }
.diff-divider {
  display: flex;
  align-items: center;
  padding: 0 1rem;
  color: var(--fg-muted);
}
.diff-arrow { font-size: 1.2rem; }
.diff-caption { text-align: center; font-size: 0.82rem; color: var(--fg-muted); font-style: italic; }

/* Closing */
.closing {
  max-width: 1100px;
  margin: 0 auto;
  padding: 6rem 2rem 5rem;
  text-align: center;
}
.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.closing-sub {
  font-size: 1.05rem;
  color: var(--fg-muted);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Footer */
.footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 2rem 3rem;
  border-top: 1px solid rgba(255,255,255,0.05);
  text-align: center;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 0.5rem;
}
.footer-copy { font-size: 0.85rem; color: var(--fg-muted); }

/* Responsive */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; padding: 4rem 1.5rem 3rem; }
  .hero-visual { order: -1; }
  .steps { grid-template-columns: 1fr; gap: 2rem; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .diff-demo-inner { grid-template-columns: 1fr; }
  .diff-left { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .diff-divider { display: none; }
  .how, .features, .diff-demo, .closing { padding: 4rem 1.5rem; }
  .nav-tagline { display: none; }
}
@media (max-width: 480px) {
  .feature-grid { grid-template-columns: 1fr; }
}