/* PlasmaLean Exposition & Onboarding Suite Stylesheet */
:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #1e293b;
  --bg-card-hover: #263449;
  --bg-code: #090d16;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;
  --accent-violet: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --border-color: #334155;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  font-size: 16px;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: #38bdf8;
  text-decoration: underline;
}

/* Top Navigation Bar matching PlasmaLean */
.site-nav {
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.site-brand .lambda-badge {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
}

.nav-links a:hover, .nav-links a.active {
  background: var(--bg-card);
  color: var(--accent-cyan);
}

.nav-links a.upstream-link {
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* Container & Layout */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.hero {
  background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.16), transparent 60%),
              radial-gradient(circle at bottom left, rgba(6, 182, 212, 0.12), transparent 55%),
              var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  margin-bottom: 2.5rem;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.pill {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pill-cyan { background: rgba(6, 182, 212, 0.15); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.35); }
.pill-indigo { background: rgba(99, 102, 241, 0.15); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.35); }
.pill-emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.35); }
.pill-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.35); }
.pill-violet { background: rgba(139, 92, 246, 0.15); color: #c084fc; border: 1px solid rgba(139, 92, 246, 0.35); }
.pill-rose { background: rgba(244, 63, 94, 0.15); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.35); }

h1 {
  font-size: 2.25rem;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h2 {
  font-size: 1.55rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.2rem;
  margin: 1.25rem 0 0.6rem;
  color: var(--accent-cyan);
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* Grid & Cards */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  border-color: var(--accent-cyan);
}

/* Code blocks */
pre {
  background: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.15rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
  color: #e2e8f0;
  margin: 1rem 0;
}

code {
  font-family: var(--font-mono);
  background: rgba(15, 23, 42, 0.7);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
  color: #38bdf8;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Filter Bar & Search */
.controls-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  align-items: center;
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.search-input {
  flex: 1;
  min-width: 240px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

.btn {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.15s ease;
}

.btn:hover, .btn.active {
  background: var(--accent-cyan);
  color: #0b0f19;
  border-color: var(--accent-cyan);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-secondary);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th {
  background: rgba(30, 41, 59, 0.9);
  color: var(--text-primary);
  padding: 1rem;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 1rem;
  border-bottom: 1px solid rgba(51, 65, 85, 0.6);
  vertical-align: top;
  font-size: 0.93rem;
}

tr:hover td {
  background: rgba(30, 41, 59, 0.45);
}

/* Split Pane for Kernel Audit & Certificate Walkthrough */
.split-pane {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 960px) {
  .split-pane {
    grid-template-columns: 1fr;
  }
}

.sticky-panel {
  position: sticky;
  top: 85px;
}

/* Stepper */
.step-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.step-tab {
  flex: 1;
  min-width: 160px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.step-tab.active {
  background: rgba(6, 182, 212, 0.14);
  border-color: var(--accent-cyan);
  color: var(--text-primary);
}

.step-tab .step-num {
  display: block;
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-weight: 700;
  text-transform: uppercase;
}

.footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4rem;
}