/* ── Variables ─────────────────────────────────────────── */
:root {
  --bg: #050816;
  --surface: #111827;
  --border: #1f2937;
  --text: #e5e7eb;
  --text-dim: #9ca3af;
  --text-bright: #f9fafb;
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.15);
  --warm: #f59e0b;
  --green: #10b981;
  --purple: #8b5cf6;
  --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', ui-monospace, 'Cascadia Code', 'Source Code Pro', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 15px;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Navbar ───────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.75rem 2rem;
  background: rgba(5, 8, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.05em;
}

.navbar nav { display: flex; gap: 1.5rem; margin-left: auto; }
.navbar nav a { color: var(--text-dim); font-size: 0.85rem; }
.navbar nav a:hover { color: var(--cyan); text-decoration: none; }

/* ── Hero ─────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 6rem 2rem 4rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.8rem;
  color: var(--text-bright);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero .tagline {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.hero .sub-tagline {
  font-size: 0.95rem;
  color: var(--cyan);
  margin-bottom: 2rem;
  font-weight: 600;
}

/* ── Sections ─────────────────────────────────────────── */
.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

h2 {
  font-size: 1.5rem;
  color: var(--text-bright);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.15rem;
  color: var(--cyan);
  margin: 1.5rem 0 0.75rem;
}

p { margin-bottom: 1rem; }

/* ── Cards ────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: box-shadow 0.3s, border-color 0.3s;
}

.card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 20px var(--cyan-dim);
}

.card h3 { margin-top: 0; }

/* ── Grids ────────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

/* ── Stat cards ───────────────────────────────────────── */
.stats { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; margin: 2rem 0; }

.stat {
  text-align: center;
  padding: 1.5rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-width: 160px;
}

.stat .number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--cyan);
  display: block;
}

.stat .label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* ── Quote ────────────────────────────────────────────── */
.quote {
  border-left: 3px solid var(--cyan);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  color: var(--text-dim);
  font-style: italic;
  background: var(--surface);
  border-radius: 0 8px 8px 0;
}

/* ── Pipeline diagram ─────────────────────────────────── */
.pipeline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.pipeline .node {
  background: var(--bg);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  white-space: nowrap;
}

.pipeline .arrow {
  color: var(--text-dim);
  font-size: 1.2rem;
}

/* ── Tables ───────────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.85rem;
}

th {
  text-align: left;
  padding: 0.75rem 1rem;
  background: var(--surface);
  color: var(--cyan);
  border-bottom: 2px solid var(--border);
}

td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
}

tr:hover td { background: rgba(34, 211, 238, 0.03); }

/* ── Tooltips ─────────────────────────────────────────── */
.tip {
  position: relative;
  border-bottom: 1px dotted var(--cyan);
  cursor: help;
  color: var(--text-bright);
}

.tip .tip-text {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 280px;
  background: var(--surface);
  border: 1px solid var(--cyan);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  padding-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--text);
  z-index: 50;
  pointer-events: none;
  transition: opacity 0.2s, visibility 0.2s;
  line-height: 1.5;
  /* Invisible bridge below the tooltip so mouse can travel from text to tooltip */
  margin-bottom: 0;
}

.tip .tip-text::before {
  /* Hover bridge: invisible hit area connecting trigger text to tooltip */
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  height: 12px;
}

.tip .tip-text::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--cyan);
}

.tip:hover .tip-text,
.tip .tip-text:hover {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.tip-link {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--cyan);
}

.tip-link:hover { text-decoration: underline; }

/* ── Code blocks ──────────────────────────────────────── */
.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 1rem 0;
  white-space: pre;
  font-family: var(--font-mono);
}

.comment { color: #6b7280; }
.keyword { color: var(--purple); }
.string { color: var(--green); }
.number { color: var(--warm); }

/* ── Signal bars ──────────────────────────────────────── */
.signal-bars {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.signal-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.signal-row .label {
  width: 120px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: right;
  flex-shrink: 0;
}

.signal-row .bar-track {
  flex: 1;
  height: 20px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
}

.signal-row .bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s;
}

.signal-row .bar-fill.cyan { background: var(--cyan); }
.signal-row .bar-fill.warm { background: var(--warm); }
.signal-row .bar-fill.green { background: var(--green); }

.signal-row .value {
  width: 50px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ── CTA buttons ──────────────────────────────────────── */
.cta-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin: 1.5rem 0; }

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--cyan);
  color: var(--bg);
}

.btn-primary:hover {
  background: #06b6d4;
  text-decoration: none;
  box-shadow: 0 0 20px var(--cyan-dim);
}

.btn-secondary {
  background: transparent;
  color: var(--cyan);
  border: 1px solid var(--cyan);
}

.btn-secondary:hover {
  background: var(--cyan-dim);
  text-decoration: none;
}

/* ── Deep dive pages ──────────────────────────────────── */
.deep-dive {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.deep-dive h1 {
  font-size: 2rem;
  color: var(--text-bright);
  margin-bottom: 0.5rem;
}

.deep-dive .subtitle {
  font-size: 1rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.back-link:hover { color: var(--cyan); }

/* ── Footer ───────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.8rem;
}

.footer a { color: var(--cyan); }

/* ── Mobile ───────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .stats { flex-direction: column; align-items: center; }
  .navbar { padding: 0.5rem 1rem; gap: 1rem; }
  .navbar nav { gap: 0.75rem; }
  .navbar nav a { font-size: 0.75rem; }
  .pipeline { flex-direction: column; }
  .section { padding: 2rem 1rem; }
  .tip .tip-text { width: 220px; }
  .signal-row .label { width: 80px; font-size: 0.75rem; }
}