:root {
  --bg:        #09090b;
  --bg-1:      #0c0c0f;
  --bg-2:      #111114;
  --bg-3:      #16161a;
  --line:      #1f1f23;
  --line-2:    #27272a;
  --fg:        #fafafa;
  --fg-1:      #e4e4e7;
  --fg-2:      #a1a1aa;
  --fg-3:      #71717a;
  --fg-4:      #52525b;
  --accent:    #a78bfa;
  --accent-2:  #8b5cf6;
  --accent-3:  #7c3aed;
  --accent-bg: rgba(167,139,250,0.10);
  --accent-line: rgba(167,139,250,0.32);
  --green:     #4ade80;
  --amber:     #fbbf24;
  --rose:      #fb7185;
  --cyan:      #22d3ee;
  --sans: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --r-sm: 4px; --r: 6px; --r-md: 8px; --r-lg: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg-1);
  font-family: var(--sans);
  font-feature-settings: "ss01","cv11";
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  position: relative;
  overflow-x: hidden;
}

/* Background treatments — toggled via body[data-bg] */
.bg-layer { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
body[data-bg="flat"] .bg-layer { display: none; }

body[data-bg="grid"] .bg-layer {
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
}

body[data-bg="noise"] .bg-layer {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.06 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

body[data-bg="gradient"] .bg-layer {
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(167,139,250,0.18), transparent 60%),
    radial-gradient(ellipse 80% 50% at 80% 30%, rgba(34,211,238,0.06), transparent 70%),
    radial-gradient(ellipse 60% 50% at 10% 70%, rgba(167,139,250,0.08), transparent 70%);
}

.page-wrap { position: relative; z-index: 1; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px;
  border-bottom: 1px solid var(--line);
  background: rgba(9,9,11,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.nav .lockup { font-family: var(--mono); font-size: 14px; color: var(--fg); display: flex; align-items: center; gap: 10px; white-space: nowrap; flex-shrink: 0; }
.nav .lockup .br { color: var(--accent); }
.nav .lockup .v { color: var(--fg-4); font-size: 11px; padding: 2px 6px; border: 1px solid var(--line-2); border-radius: 999px; }
.nav .links { display: flex; gap: 22px; font-size: 13px; }
.nav .links a { color: var(--fg-2); text-decoration: none; }
.nav .links a:hover { color: var(--fg); }
.nav .right { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }
.nav .right .btn { white-space: nowrap; }

/* Buttons */
.btn {
  font-family: var(--sans); font-size: 13px; font-weight: 500;
  height: 34px; padding: 0 14px; border-radius: var(--r);
  border: 1px solid transparent; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  transition: background .12s, border-color .12s, color .12s, transform .12s;
  text-decoration: none;
}
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-primary:hover { background: var(--fg-1); }
.btn-secondary { background: var(--bg-3); color: var(--fg); border-color: var(--line-2); }
.btn-secondary:hover { background: #1d1d22; }
.btn-ghost { background: transparent; color: var(--fg-1); }
.btn-ghost:hover { background: var(--bg-3); }
.btn-accent { background: var(--accent); color: #1a0f33; font-weight: 600; }
.btn-accent:hover { background: #b69cff; }
.btn-outline { background: transparent; color: var(--fg-1); border-color: var(--line-2); }
.btn-outline:hover { border-color: var(--fg-4); }
.btn-lg { height: 42px; padding: 0 18px; font-size: 14px; }
.btn-sm { height: 28px; padding: 0 10px; font-size: 12px; }

/* Badge */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  height: 22px; padding: 0 8px; border-radius: 999px;
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  border: 1px solid var(--line-2); background: var(--bg-3); color: var(--fg-1);
}
.badge-accent { background: var(--accent-bg); color: var(--accent); border-color: var(--accent-line); }
.badge-green  { background: rgba(74,222,128,.10); color: var(--green); border-color: rgba(74,222,128,.3); }
.badge-amber  { background: rgba(251,191,36,.10); color: var(--amber); border-color: rgba(251,191,36,.3); }
.badge-rose   { background: rgba(251,113,133,.10); color: var(--rose); border-color: rgba(251,113,133,.3); }
.badge-dot::before { content:""; width:6px; height:6px; border-radius:999px; background: currentColor; box-shadow: 0 0 8px currentColor; }

/* ---------- Hero ---------- */
.hero {
  max-width: 1200px; margin: 0 auto;
  padding: 96px 32px 80px;
  text-align: center;
}
.hero .pre {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px;
  color: var(--fg-2); padding: 6px 12px; border: 1px solid var(--line-2);
  border-radius: 999px; background: var(--bg-2);
  white-space: nowrap;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 600;
  color: var(--fg);
  margin: 28px auto 0;
  max-width: 880px;
  text-wrap: balance;
}
.hero h1 .accent { color: var(--accent); font-style: italic; font-family: 'Inter'; font-weight: 500; }
.hero .sub {
  margin: 28px auto 0;
  max-width: 600px;
  font-size: 17px;
  color: var(--fg-2);
  text-wrap: pretty;
}
.hero .cta { margin-top: 36px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.install {
  margin: 28px auto 0;
  max-width: 460px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  padding: 8px 8px 8px 16px;
  font-family: var(--mono); font-size: 13px;
}
.install .cmd { color: var(--fg-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.install .cmd .pr { color: var(--accent); margin-right: 10px; user-select: none; }
.install .copy {
  background: var(--bg-3); color: var(--fg-1); border: 1px solid var(--line-2);
  height: 30px; padding: 0 10px; border-radius: var(--r); font-size: 11px;
  cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono);
}
.install .copy:hover { background: #1d1d22; color: var(--fg); }
.install .copy.copied { color: var(--green); border-color: rgba(74,222,128,.3); }

/* ---------- Section ---------- */
.section { max-width: 1200px; margin: 0 auto; padding: 80px 32px; }
.section-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 36px; }
.section-head .num { font-family: var(--mono); font-size: 11px; color: var(--fg-4); letter-spacing: 0.16em; }
.section-head h2 { font-size: 30px; font-weight: 600; letter-spacing: -0.02em; color: var(--fg); margin: 0; }
.section-head .sub { color: var(--fg-3); font-size: 14px; margin-left: 12px; }
.section-head .rule { flex: 1; height: 1px; background: var(--line); transform: translateY(-6px); }

/* ---------- Why / Principles ---------- */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; }
.principle { background: var(--bg-1); padding: 28px 28px 32px; }
.principle .k { font-family: var(--mono); font-size: 11px; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; }
.principle h3 { font-size: 20px; font-weight: 600; color: var(--fg); margin: 12px 0 8px; letter-spacing: -0.01em; }
.principle p { color: var(--fg-2); font-size: 14px; margin: 0; }

/* ---------- Features ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 22px;
  transition: border-color .15s, transform .15s;
}
.feature:hover { border-color: var(--line-2); }
.feature .icon {
  width: 32px; height: 32px;
  border: 1px solid var(--line-2); border-radius: var(--r);
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  background: var(--bg-1);
  margin-bottom: 16px;
}
.feature h3 { font-size: 15px; font-weight: 600; color: var(--fg); margin: 0 0 6px; }
.feature p { color: var(--fg-3); font-size: 13px; margin: 0; }

/* ---------- Code tabs ---------- */
.codecard {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.codecard .tabs {
  display: flex; align-items: stretch;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
}
.codecard .tab {
  font-family: var(--mono); font-size: 12px; color: var(--fg-3);
  padding: 12px 18px; cursor: pointer;
  border: 0; background: transparent;
  border-right: 1px solid var(--line);
  border-bottom: 2px solid transparent;
  display: inline-flex; align-items: center; gap: 8px;
}
.codecard .tab .dot { width: 8px; height: 8px; border-radius: 999px; background: var(--fg-4); }
.codecard .tab.active { color: var(--fg); background: var(--bg-1); border-bottom-color: var(--accent); }
.codecard .tab.active .dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.codecard .tab.island.active .dot { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.codecard .tabspace { flex: 1; border-bottom: 0; }
.codecard .right-meta { padding: 8px 14px; font-family: var(--mono); font-size: 11px; color: var(--fg-4); align-self: center; display: flex; gap: 10px; }

.codecard pre {
  margin: 0; padding: 22px 26px;
  font-family: var(--mono); font-size: 13px;
  line-height: 1.75; color: var(--fg-1);
  overflow-x: auto;
}
.codecard pre .c { color: var(--fg-4); }
.codecard pre .k { color: var(--accent); }
.codecard pre .s { color: var(--green); }
.codecard pre .t { color: var(--cyan); }
.codecard pre .p { color: var(--amber); }
.codecard pre .n { color: var(--fg-3); }
.codecard pre .ln { display: inline-block; width: 28px; color: var(--fg-4); user-select: none; text-align: right; padding-right: 14px; }

.code-island-flag {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(34,211,238,0.08);
  color: var(--cyan);
  border: 1px solid rgba(34,211,238,0.3);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10.5px;
  margin-left: 6px;
}

/* ---------- Diagram ---------- */
.diagram-frame {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  align-items: stretch;
  position: relative;
  min-height: 320px;
}

.dnode {
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  padding: 16px;
  position: relative;
}
.dnode .lbl {
  font-family: var(--mono); font-size: 10.5px;
  color: var(--fg-3); letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 10px;
}
.dnode.active .lbl { color: var(--accent); }
.dnode .body { font-family: var(--mono); font-size: 12px; color: var(--fg-2); line-height: 1.7; min-height: 180px; }
.dnode .body .tag { color: var(--accent); }
.dnode .body .str { color: var(--green); }
.dnode .body .com { color: var(--fg-4); }
.dnode .body .island-mark {
  display: inline-block;
  border: 1px dashed rgba(34,211,238,0.45);
  background: rgba(34,211,238,0.06);
  color: var(--cyan);
  border-radius: 4px;
  padding: 1px 6px;
  margin: 2px 0;
}
.dnode.flash {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg);
}
.dnode.flash-cyan {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.15);
}

.diagram-controls {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px;
  font-family: var(--mono); font-size: 11px; color: var(--fg-3);
}
.diagram-controls .steps { display: flex; gap: 6px; }
.diagram-controls .step {
  height: 4px; width: 32px; background: var(--line-2); border-radius: 2px; cursor: pointer;
}
.diagram-controls .step.active { background: var(--accent); }
.diagram-controls .play {
  background: var(--bg-3); border: 1px solid var(--line-2);
  color: var(--fg-1); height: 28px; padding: 0 12px;
  border-radius: var(--r); font-family: var(--mono); font-size: 11px; cursor: pointer;
}

.flow-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 20px; height: 1px; background: var(--line-2);
}
.flow-arrow::after {
  content: ""; position: absolute; right: 0; top: -3px;
  border: 4px solid transparent; border-left-color: var(--line-2);
}
.flow-arrow.lit { background: var(--accent); }
.flow-arrow.lit::after { border-left-color: var(--accent); }
.flow-arrow.cyan { background: var(--cyan); }
.flow-arrow.cyan::after { border-left-color: var(--cyan); }

/* ---------- Live island demo ---------- */
.island-demo {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}
.island-demo .preview {
  padding: 32px;
  border-right: 1px solid var(--line);
  background:
    repeating-linear-gradient(45deg, transparent 0 12px, rgba(255,255,255,0.012) 12px 13px);
  position: relative;
}
.island-demo .label-strip {
  font-family: var(--mono); font-size: 10.5px;
  color: var(--fg-3); letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 16px;
  display: flex; justify-content: space-between;
}
.faux-html {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 16px 18px;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.7;
  color: var(--fg-2);
}
.faux-html .static { color: var(--fg-2); }
.faux-html .island-zone {
  display: block;
  margin: 10px 0;
  padding: 12px 14px;
  border: 1px dashed rgba(34,211,238,0.45);
  background: rgba(34,211,238,0.05);
  border-radius: var(--r);
  color: var(--fg-1);
}
.faux-html .island-zone.hydrated { border-style: solid; }
.faux-html .island-tag { color: var(--cyan); font-size: 10.5px; display: block; margin-bottom: 6px; }

.counter {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--sans);
}
.counter .val { font-family: var(--mono); font-size: 28px; font-weight: 600; color: var(--fg); min-width: 2ch; text-align: center; letter-spacing: -0.02em; }
.counter button {
  width: 34px; height: 34px;
  background: var(--bg-3); color: var(--fg);
  border: 1px solid var(--line-2); border-radius: var(--r);
  font-family: var(--mono); font-size: 16px; cursor: pointer;
}
.counter button:hover { background: #1d1d22; border-color: var(--fg-4); }
.counter button:active { transform: translateY(1px); }
.counter .reset {
  margin-left: auto;
  background: transparent; color: var(--fg-3);
  font-family: var(--mono); font-size: 11px;
  border: 1px solid var(--line-2); height: 26px; padding: 0 10px; border-radius: var(--r);
  cursor: pointer;
}

.island-demo .panel {
  padding: 24px;
  display: flex; flex-direction: column; gap: 14px;
}
.metric {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 12px 14px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.metric .k { font-family: var(--mono); font-size: 11px; color: var(--fg-3); letter-spacing: 0.08em; }
.metric .v { font-family: var(--mono); font-size: 14px; color: var(--fg); white-space: nowrap; }
.metric .v.green { color: var(--green); }
.metric .v.amber { color: var(--amber); }
.metric .v.cyan  { color: var(--cyan); }

.registry-block {
  margin-top: 4px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 14px;
  font-family: var(--mono); font-size: 12px; line-height: 1.7;
}
.registry-block .lbl { color: var(--fg-4); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 8px; }
.registry-block .item { display: flex; justify-content: space-between; color: var(--fg-2); }
.registry-block .item .name { color: var(--fg-1); }
.registry-block .item .ok { color: var(--green); }
.registry-block .item .pending { color: var(--fg-4); }

/* ---------- Comparison ---------- */
.compare {
  width: 100%;
  border-collapse: separate; border-spacing: 0;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  font-family: var(--sans);
  font-size: 13.5px;
}
.compare th, .compare td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.compare thead th {
  font-family: var(--mono); font-size: 11px;
  color: var(--fg-3); letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 500;
  background: var(--bg-2);
}
.compare tr:last-child td { border-bottom: 0; }
.compare th.us { color: var(--accent); }
.compare td.row-label { color: var(--fg); font-weight: 500; }
.compare td.row-label small { display: block; color: var(--fg-3); font-weight: 400; font-size: 12px; margin-top: 2px; }
.compare td .v {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 12px;
  white-space: nowrap;
}
.compare td .v.yes { color: var(--green); }
.compare td .v.no  { color: var(--fg-4); }
.compare td .v.opt { color: var(--amber); }
.compare td.col-us { background: rgba(167,139,250,0.04); }

/* ---------- Footer ---------- */
.foot {
  margin-top: 64px;
  border-top: 1px solid var(--line);
  background: var(--bg-1);
}
.foot .inner {
  max-width: 1200px; margin: 0 auto;
  padding: 56px 32px 40px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.foot .lockup { font-family: var(--mono); font-size: 14px; color: var(--fg); }
.foot .lockup .br { color: var(--accent); }
.foot .blurb { color: var(--fg-3); font-size: 13px; margin-top: 12px; max-width: 280px; }
.foot h4 { font-family: var(--mono); font-size: 11px; color: var(--fg-3); letter-spacing: 0.14em; text-transform: uppercase; margin: 0 0 14px; font-weight: 500; }
.foot ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.foot a { color: var(--fg-1); text-decoration: none; font-size: 13px; }
.foot a:hover { color: var(--accent); }
.foot .meta-row {
  max-width: 1200px; margin: 0 auto;
  padding: 18px 32px;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 11px; color: var(--fg-4);
}

/* responsive */
@media (max-width: 900px) {
  .principles, .features, .island-demo, .diagram-frame { grid-template-columns: 1fr !important; }
  .foot .inner { grid-template-columns: 1fr 1fr; }
  .nav .links { display: none; }
}