/* ============================================================
   poolboy — design system
   pure black · white · single green accent
   ============================================================ */
:root {
  --bg: #000;
  --surface: #0a0a0a;
  --surface-2: #121212;
  --border: #1a1a1a;
  --border-2: #2a2a2a;
  --fg: #fff;
  --fg-2: #a0a0a0;
  --fg-3: #666;
  --fg-4: #333;
  --accent: #ff2e92;
  --accent-dim: #cc1c74;
  --danger: #ff3355;
  --blue: #3aa0ff;
  --yellow: #ffcf3a;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', 'Menlo', 'Consolas', monospace;
  --max: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
code { font-family: var(--mono); font-size: 0.92em; color: var(--accent); background: var(--surface); padding: 0.1em 0.35em; border-radius: 3px; border: 1px solid var(--border); }
h1, h2, h3 { letter-spacing: -0.02em; }
p { color: var(--fg-2); }
.accent { color: var(--accent); }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(0, 0, 0, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
  animation: blink 2s infinite;
}
@keyframes blink {
  0%, 70%, 100% { opacity: 1; }
  85% { opacity: 0.3; }
}
.nav-links {
  display: flex;
  gap: 28px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-2);
}
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--accent); }
@media (max-width: 720px) { .nav-links { display: none; } }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding: 120px 0 140px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 75%);
}
.hero-bg::after {
  content: '';
  position: absolute;
  top: 20%; left: 50%;
  transform: translateX(-50%);
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(255,46,146,0.09), transparent 60%);
  filter: blur(40px);
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 8px 16px;
  border: 1px solid var(--border-2);
  border-radius: 100px;
  margin-bottom: 32px;
}
.pulse {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
  animation: pulse-ring 1.6s infinite;
}
@keyframes pulse-ring {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,46,146,0.6); }
  50%      { box-shadow: 0 0 0 8px rgba(255,46,146,0); }
}
.hero-title {
  font-size: clamp(80px, 14vw, 180px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.05em;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #fff 0%, #888 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-title .accent {
  -webkit-text-fill-color: var(--accent);
  background: none;
}
.hero-tagline {
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 600;
  color: var(--fg);
  max-width: 800px;
  margin: 0 auto 12px;
  min-height: 1.5em;
}
.hero-tagline::after {
  content: '▋';
  color: var(--accent);
  animation: blink 1s infinite;
  margin-left: 2px;
}
.hero-tagline.done::after { display: none; }
.hero-subline {
  font-size: 16px;
  color: var(--fg-2);
  max-width: 600px;
  margin: 0 auto 48px;
}

.terminal {
  max-width: 760px;
  margin: 0 auto 48px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: 10px;
  overflow: hidden;
  text-align: left;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,46,146,0.04);
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #050505;
  border-bottom: 1px solid var(--border);
}
.term-dot { width: 11px; height: 11px; border-radius: 50%; }
.term-dot.r { background: #ff5f56; }
.term-dot.y { background: #ffbd2e; }
.term-dot.g { background: #27c93f; }
.term-title {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-3);
}
.term-body {
  font-family: var(--mono);
  font-size: 14px;
  padding: 20px 24px;
  line-height: 1.75;
}
.term-line { color: var(--fg); }
.term-out { color: var(--fg-3); font-size: 13px; }
.prompt { color: var(--accent); margin-right: 10px; }
.cursor { color: var(--accent); animation: blink 1s infinite; }
.dim { color: var(--fg-3); }

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 80px;
  flex-wrap: wrap;
}
.btn {
  padding: 14px 28px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn.primary {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 32px rgba(255,46,146,0.3);
}
.btn.primary:hover {
  background: #fff;
  box-shadow: 0 0 48px rgba(255,255,255,0.4);
  transform: translateY(-1px);
}
.btn.ghost {
  border-color: var(--border-2);
  color: var(--fg);
}
.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: 900px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.hero-stats > div {
  padding: 28px 16px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.hero-stats > div:last-child { border-right: none; }
.stat-n {
  font-family: var(--mono);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}
.stat-l {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-3);
}
@media (max-width: 720px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stats > div:nth-child(2) { border-right: none; }
  .hero-stats > div:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
}

/* ============================================================
   SECTIONS (shared)
   ============================================================ */
.section {
  padding: 120px 0;
  border-top: 1px solid var(--border);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 24px;
}
.section h2 {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
  max-width: 900px;
}
.section .lead {
  font-size: 19px;
  color: var(--fg-2);
  max-width: 700px;
  margin-bottom: 24px;
  line-height: 1.6;
}
.section p + p { margin-top: 16px; }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: 48px; }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse, .brand-dot, .cursor, .hero-tagline::after { animation: none; }
  #pulse { display: none; }
}

/* ============================================================
   2 — CHART
   ============================================================ */
.chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.chart { width: 100%; height: auto; display: block; }
.chart .axis { fill: var(--fg-3); font: 11px var(--mono); }
.chart .tick { fill: var(--fg-3); font: 10px var(--mono); }
.chart .tick.danger { fill: var(--danger); }
.chart .label { font: 11px var(--mono); font-weight: 600; }
.chart .label.danger { fill: var(--danger); }
.chart .label.accent { fill: var(--accent); }
.chart .label.sm { font-size: 10px; }

/* ============================================================
   3 — PIPELINE
   ============================================================ */
.pipeline {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 16px;
  overflow-x: auto;
}
.pipe-svg { width: 100%; min-width: 900px; height: auto; }
.node-box {
  fill: #0f0f0f;
  stroke: var(--border-2);
  stroke-width: 1;
}
.node-box.hot {
  stroke: var(--accent);
  stroke-opacity: 0.5;
  fill: #1a0615;
}
.node-title { fill: var(--fg); font: 600 13px var(--font); text-anchor: middle; }
.node-title.sm { font-size: 12px; }
.node-sub   { fill: var(--fg-3); font: 11px var(--mono); text-anchor: middle; }
.cap-label  { fill: var(--fg-2); font: 11px var(--mono); }
.cap-label.dim { fill: var(--fg-3); }

/* ============================================================
   4 — CHUNKING
   ============================================================ */
.cdc-compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 48px;
}
.cdc-row {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.cdc-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.cdc-chunks {
  display: flex;
  gap: 3px;
  height: 44px;
  border-radius: 4px;
  overflow: hidden;
}
.chunk {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg);
  background: #2a2a2a;
  border-radius: 3px;
  transition: background 0.4s, color 0.4s;
}
.chunk.c1 { background: #3a3a3a; }
.chunk.c2 { background: #2f3a2f; }
.chunk.c3 { background: #3a2f3a; }
.chunk.c4 { background: #3a3a2f; }
.chunk.c5 { background: #2f3a3a; }
.chunk.c6 { background: #3a2f2f; }
.chunk.c7 { background: #2a3a2a; }
.chunk.c8 { background: #32323a; }
.chunk.ok { background: #3a0a24; color: var(--accent); border: 1px solid rgba(255,46,146,0.3); }
.chunk.danger { background: #3a0f15; color: var(--danger); border: 1px solid rgba(255,51,85,0.4); }
.cdc-after {
  margin-top: 16px;
  position: relative;
}
.insert-marker {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 4px;
}
.cdc-tag {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.cdc-tag.danger { color: var(--danger); }
.cdc-tag.accent { color: var(--accent); }

/* ============================================================
   5 — WIRE FORMAT
   ============================================================ */
.wire {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  margin-top: 24px;
  font-family: var(--mono);
}
.wire-row {
  display: grid;
  grid-template-columns: 80px 80px 1fr 1fr 1.5fr;
  gap: 4px;
  margin-bottom: 8px;
}
@media (max-width: 720px) { .wire-row { grid-template-columns: 1fr 1fr; } }
.wire-cell {
  background: #0f0f0f;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  padding: 12px;
  min-height: 78px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.wire-cell.magic {
  border-color: var(--accent);
  background: rgba(255,46,146,0.06);
}
.wire-cell.magic .wire-val { color: var(--accent); }
.wire-cell.big { grid-column: span 1; }
.wire-val {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.02em;
  word-break: break-all;
}
.wire-meta {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-3);
  margin-top: 8px;
}
.wire-caption {
  font-size: 11px;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  text-align: center;
  margin: 12px 0 24px;
}
.wire-ops {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 16px;
}
.op {
  display: grid;
  grid-template-columns: 60px 90px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 14px 16px;
  background: #0f0f0f;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  font-size: 13px;
}
@media (max-width: 720px) { .op { grid-template-columns: 1fr; gap: 4px; } }
.op-tag {
  color: var(--accent);
  font-weight: 700;
}
.op-name {
  color: var(--fg);
  font-weight: 600;
}
.op-args {
  color: var(--fg-2);
}
.op-note {
  color: var(--fg-3);
  font-size: 12px;
}

/* ============================================================
   6 — ARCHITECTURE
   ============================================================ */
.arch-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  margin-top: 32px;
  align-items: center;
}
@media (max-width: 900px) {
  .arch-grid { grid-template-columns: 1fr; }
}
.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}
.arch-diagram svg { width: 100%; height: auto; }
.arch-node rect { transition: all 0.4s; }
.arch-node.active rect { stroke: var(--accent); stroke-width: 2; filter: drop-shadow(0 0 10px rgba(255,46,146,0.5)); }
#leader.elected rect { fill: rgba(255,46,146,0.1); stroke: var(--accent); stroke-width: 2; filter: drop-shadow(0 0 16px rgba(255,46,146,0.5)); }
.net-label { fill: var(--fg-3); font: 11px var(--mono); }

.arch-steps ol {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.arch-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all 0.3s;
}
.arch-steps li.active {
  background: rgba(255,46,146,0.05);
  border-color: rgba(255,46,146,0.2);
}
.arch-steps li.active .step-n { color: var(--accent); border-color: var(--accent); }
.step-n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: 1px solid var(--border-2);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-3);
  transition: all 0.3s;
}
.arch-steps b { display: block; font-size: 15px; margin-bottom: 2px; }
.arch-steps p { font-size: 13px; color: var(--fg-3); }

/* ============================================================
   7 — SEQUENCE DIAGRAM
   ============================================================ */
.seq {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 16px;
  overflow-x: auto;
  margin-top: 24px;
}
.seq-svg { width: 100%; min-width: 960px; height: auto; }
.lane { fill: var(--fg); font: 600 12px var(--mono); text-anchor: start; }
.msg-label { font: 11px var(--mono); }
.msg-label.blue   { fill: var(--blue); }
.msg-label.yellow { fill: var(--yellow); }
.msg-label.green  { fill: var(--accent); }
.msg-label.white  { fill: var(--fg); }
.tstamp { fill: var(--fg-3); font: 10px var(--mono); }

/* ============================================================
   8 — FEATURE GRID
   ============================================================ */
.grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
@media (max-width: 900px) { .grid-6 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-6 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.3s;
}
.card:hover {
  border-color: rgba(255,46,146,0.3);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(255,46,146,0.08);
}
.card-n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.15em;
  margin-bottom: 16px;
}
.card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}
.card p {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.55;
}

/* ============================================================
   9 — USE CASES
   ============================================================ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }
.case {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.case-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.case h3 { font-size: 20px; font-weight: 700; }
.case p { color: var(--fg-2); font-size: 14px; line-height: 1.6; }
.case-stat {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

/* ============================================================
   10 — CODE TABS
   ============================================================ */
.tabs {
  margin-top: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab {
  background: none;
  color: var(--fg-3);
  border: none;
  padding: 14px 20px;
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all 0.2s;
}
.tab:hover { color: var(--fg-2); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: rgba(255,46,146,0.04);
}
.tab-panel {
  display: none;
  padding: 24px 28px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  overflow-x: auto;
}
.tab-panel.active { display: block; }
.tab-panel code {
  background: none;
  padding: 0;
  border: none;
  color: var(--fg);
}
/* rust-ish syntax tokens */
.kw  { color: #ff79c6; }
.fn  { color: #50fa7b; }
.ty  { color: #8be9fd; }
.num { color: #ffb86c; }
.str { color: #f1fa8c; }
.c1  { color: #6272a4; font-style: italic; }
.amp { color: #ff79c6; }

/* ============================================================
   11 — STACK STRIP
   ============================================================ */
.stack-section { padding: 64px 0; border-top: 1px solid var(--border); }
.stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-2);
}
.stack span:not(.sep) {
  padding: 8px 14px;
  border: 1px solid var(--border-2);
  border-radius: 100px;
  transition: all 0.2s;
  cursor: default;
}
.stack span:not(.sep):hover {
  border-color: var(--accent);
  color: var(--accent);
}
.stack .sep { color: var(--fg-4); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.4fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr; } }
.footer .brand.big { font-size: 20px; margin-bottom: 12px; }
.footer-head {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 14px;
}
.footer-list { list-style: none; display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--fg-2); }
.footer-list code { background: none; border: none; padding: 0; color: var(--fg); font-weight: 500; }
.footer .muted { color: var(--fg-3); font-size: 13px; }
.footer .muted.mono { font-family: var(--mono); font-size: 11px; }
.footer-bot {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}