:root {
  --bg-deep: #040814;
  --bg-surface: #091226;
  --bg-elevated: #0e1b38;
  --bg-glass: rgba(9, 18, 38, 0.78);
  --border-subtle: rgba(148, 163, 184, 0.14);
  --border-blue: rgba(59, 130, 246, 0.42);
  --border-red: rgba(239, 68, 68, 0.38);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --bla-blue: #3b82f6;
  --bla-blue-bright: #60a5fa;
  --bla-blue-deep: #2563eb;
  --bla-sky: #38bdf8;
  --bla-blue-soft: rgba(59, 130, 246, 0.12);
  --rea-red: #ef4444;
  --rea-red-soft: rgba(239, 68, 68, 0.11);
  --amber: #f59e0b;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-color: var(--bg-deep);
  background-image:
    radial-gradient(circle at 18% 8%, rgba(37, 99, 235, 0.14), transparent 40%),
    radial-gradient(circle at 82% 14%, rgba(56, 189, 248, 0.09), transparent 36%);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* Header & Navigation — clean and airy */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(4, 8, 20, 0.84);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.45));
}

.hero-logo {
  width: 84px;
  height: 84px;
  object-fit: contain;
  display: block;
  margin: 0 auto 20px;
  filter: drop-shadow(0 0 24px rgba(59, 130, 246, 0.55));
}

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-blue);
  border-radius: 9px;
  padding: 7px 12px;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.lang-select:hover,
.lang-select:focus {
  border-color: var(--bla-sky);
  background: var(--bg-elevated);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--bla-blue-bright), var(--bla-blue-deep));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.9rem;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.35);
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bla-blue-soft);
  color: var(--bla-blue-bright);
  border: 1px solid var(--border-blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.1);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 9px;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--bla-blue-deep);
  color: #ffffff;
  border: 1px solid var(--bla-blue-bright);
}

.nav-cta:hover {
  background: var(--bla-blue);
}

.star-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: #fde68a;
}

.btn-star {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 20px;
  border-radius: 11px;
  background: rgba(245, 158, 11, 0.1);
  color: #fde68a;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid rgba(245, 158, 11, 0.42);
}

.btn-star:hover {
  background: rgba(245, 158, 11, 0.18);
  border-color: #fbbf24;
}

.star-welcome {
  margin-top: 22px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.star-welcome a {
  color: var(--bla-blue-bright);
  border-bottom: 1px dashed rgba(96, 165, 250, 0.45);
  padding-bottom: 2px;
}

.star-welcome a:hover {
  color: #fde68a;
  border-bottom-color: #fde68a;
}

/* Generous Vertical Spacing so pages feel calm and uncrowded */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  max-width: 680px;
  margin-bottom: 48px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bla-blue-bright);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 14px;
}

.section-lead {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Hero Section */
.hero {
  padding: 104px 0 88px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--bla-blue-soft);
  border: 1px solid var(--border-blue);
  color: var(--bla-blue-bright);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 28px;
}

.hero-pill .dot-red {
  color: var(--rea-red);
}

.hero-title {
  font-size: clamp(2.5rem, 5.2vw, 4.1rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.12;
  max-width: 860px;
  margin: 0 auto 22px;
}

.hero-title .text-blue {
  background: linear-gradient(95deg, #60a5fa, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .text-red {
  color: var(--rea-red);
}

.hero-subtitle {
  font-size: clamp(1.08rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* Clean Command Switcher in Hero */
.command-box {
  max-width: 640px;
  margin: 0 auto 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.16);
}

.command-code {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  color: var(--bla-blue-bright);
  overflow-x: auto;
  white-space: nowrap;
}

.copy-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border-blue);
  background: var(--bla-blue-soft);
  color: var(--bla-blue-bright);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  background: var(--bla-blue-deep);
  color: #ffffff;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 11px;
  background: var(--bla-blue-deep);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid var(--bla-blue-bright);
}

.btn-primary:hover {
  background: var(--bla-blue);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 11px;
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--border-blue);
}

/* Spacious Cards & Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--border-blue);
  transform: translateY(-2px);
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bla-blue-soft);
  color: var(--bla-blue-bright);
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.65;
}

/* Red vs. Blue Interactive Simulator */
.sim-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.sim-tab {
  padding: 9px 16px;
  border-radius: 9px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
}

.sim-tab.active,
.sim-tab:hover {
  border-color: var(--bla-blue-bright);
  background: var(--bla-blue-soft);
  color: var(--text-primary);
}

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

.duel-panel {
  border-radius: var(--radius-md);
  padding: 28px;
  background: var(--bg-surface);
}

.duel-panel.red {
  border: 1px solid var(--border-red);
  background: linear-gradient(180deg, rgba(239, 68, 68, 0.06), var(--bg-surface) 45%);
}

.duel-panel.blue {
  border: 1px solid var(--border-blue);
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.1), var(--bg-surface) 45%);
}

.duel-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.duel-badge.red {
  background: var(--rea-red-soft);
  color: #fca5a5;
  border: 1px solid var(--border-red);
}

.duel-badge.blue {
  background: var(--bla-blue-soft);
  color: #93c5fd;
  border: 1px solid var(--border-blue);
}

.metric-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.93rem;
}

.metric-row:last-of-type {
  border-bottom: none;
}

.metric-label {
  color: var(--text-secondary);
}

.metric-val {
  font-family: var(--font-mono);
  font-weight: 700;
}

.metric-val.red {
  color: #f87171;
}

.metric-val.blue {
  color: var(--bla-blue-bright);
}

/* Collapsible Details Drawer (keeps pages clean like rea.tools) */
details.evidence-drawer {
  margin-top: 20px;
  background: var(--bg-deep);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

details.evidence-drawer summary {
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--bla-blue-bright);
  cursor: pointer;
  user-select: none;
}

details.evidence-drawer summary:hover {
  background: rgba(59, 130, 246, 0.06);
}

.drawer-body {
  padding: 16px 18px;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: #cbd5e1;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.55;
}

pre.code-block {
  background: var(--bg-deep);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: #dbeafe;
  overflow-x: auto;
  line-height: 1.6;
  margin-top: 14px;
}

/* Footer */
.site-footer {
  padding: 56px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

@media (max-width: 860px) {
  .grid-3,
  .grid-2,
  .duel-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 64px 0;
  }
  .hero {
    padding: 72px 0 56px;
  }
}