:root, [data-theme="light"] {
  --paper: #EDEAE0;
  --paper-2: #E2DECE;
  --line: rgba(20,18,10,0.14);
  --ink: #16181C;
  --ink-dim: #55565A;
  --signal: #A8631E;
  --signal-2: #7C4A16;
  --card: #F5F3EA;
  --shadow: rgba(20,18,10,0.10);
  --good: #3F6B4A;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Public Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Consolas, monospace;
}

[data-theme="dark"] {
  --paper: #0C0D10;
  --paper-2: #14161B;
  --line: rgba(230,225,210,0.14);
  --ink: #E6E3D8;
  --ink-dim: #8C8E96;
  --signal: #E0A552;
  --signal-2: #B87E33;
  --card: #14161B;
  --shadow: rgba(0,0,0,0.5);
  --good: #7FBF8E;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-body); line-height: 1.6; -webkit-font-smoothing: antialiased;
}
::selection { background: var(--signal); color: var(--paper); }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; text-wrap: balance; margin: 0; }
code, .mono { font-family: var(--font-mono); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 3rem); }

.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.04em; }
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); flex: none; }
.nav-cta {
  font-family: var(--font-mono); font-size: 0.8rem; padding: 0.5rem 0.9rem;
  border: 1px solid var(--line); border-radius: 3px; text-decoration: none;
  transition: border-color .2s, color .2s;
}
.nav-cta:hover { border-color: var(--signal); color: var(--signal); }

.theme-toggle-btn {
  background: #FFFFFF !important;
  color: #16181C !important;
  border: 1.5px solid var(--line) !important;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.45rem 1.1rem;
  border-radius: 9999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transition: all 0.2s ease;
}
.theme-toggle-btn:hover {
  background: #F8F9FA !important;
  border-color: var(--signal) !important;
  transform: translateY(-1px);
}
[data-theme="dark"] .theme-toggle-btn {
  background: #1E2028 !important;
  color: #E0A552 !important;
  border-color: #E0A552 !important;
  box-shadow: 0 2px 12px rgba(224, 165, 82, 0.25);
}
[data-theme="dark"] .theme-toggle-btn:hover {
  background: #2A2D38 !important;
}

.hero { padding: clamp(3rem, 9vw, 7rem) 0 clamp(2rem, 6vw, 4rem); position: relative; }
.eyebrow {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--signal); display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1.4rem;
}
.eyebrow::before { content: ''; width: 22px; height: 1px; background: var(--signal); }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); font-optical-sizing: auto; line-height: 1.02; letter-spacing: -0.01em; }
.hero h1 em { font-style: italic; color: var(--signal); font-weight: 500; }
.hero-sub { margin-top: 1.6rem; font-size: 1.1rem; color: var(--ink-dim); max-width: 46ch; }
.hero-actions { display: flex; gap: 1rem; margin-top: 2.2rem; flex-wrap: wrap; align-items: center; }
.btn-primary {
  font-family: var(--font-mono); font-size: 0.85rem; text-decoration: none;
  background: var(--ink); color: var(--paper); padding: 0.85rem 1.4rem; border-radius: 3px;
  transition: transform .15s ease, background .2s;
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-secondary { font-family: var(--font-mono); font-size: 0.85rem; text-decoration: none; color: var(--ink-dim); border-bottom: 1px dashed var(--line); padding-bottom: 2px; }
.btn-secondary:hover { color: var(--signal); border-color: var(--signal); }

.stage {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  border: 1px solid var(--line); border-radius: 4px; overflow: hidden;
  background: var(--paper-2); box-shadow: 0 30px 60px -30px var(--shadow);
}
.stage-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.8rem 1.1rem; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-dim);
}
.stage-head .live { display: flex; align-items: center; gap: 0.4rem; }
.stage-head .live .pip { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); animation: pulse 2s ease-in-out infinite; }
canvas#resolveCanvas { display: block; width: 100%; height: 320px; }
.stage-foot { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.78rem; }
.stage-foot div { padding: 0.9rem 1.1rem; border-right: 1px solid var(--line); }
.stage-foot div:last-child { border-right: none; }
.stage-foot .num { display: block; font-size: 1.05rem; color: var(--ink); margin-top: 0.15rem; }
.stage-foot .num.hit { color: var(--signal); }

@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.25; } }

section.beat { padding: clamp(3.5rem, 9vw, 7rem) 0; border-top: 1px solid var(--line); }
.beat-label {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-dim); letter-spacing: 0.08em;
  display: grid; grid-template-columns: 2.4rem 1fr; align-items: baseline; gap: 0.6rem; margin-bottom: 1.6rem;
}
.beat-label .stage-no { color: var(--signal); font-size: 0.9rem; }
.beat h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); margin-bottom: 1.1rem; }
.beat .lede { color: var(--ink-dim); font-size: 1.05rem; max-width: 56ch; margin-bottom: 2.2rem; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

.wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 5px; max-width: 560px; margin-bottom: 1.6rem; }
.wall span { height: 20px; border-radius: 2px; background: var(--line); }
.wall span.hot { background: var(--signal); opacity: 0.55; }
.accuracy-drop { display: flex; align-items: baseline; gap: 1.4rem; font-family: var(--font-mono); }
.accuracy-drop .big { font-family: var(--font-display); font-size: 3rem; color: var(--ink); }
.accuracy-drop .big.dim { color: var(--ink-dim); text-decoration: line-through; text-decoration-color: var(--line); font-size: 2.2rem; }
.accuracy-drop .arrow { color: var(--signal); font-size: 1.4rem; }

.balance { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 2rem; }
.beam { border: 1px solid var(--line); border-radius: 4px; padding: 1.4rem; background: var(--card); }
.beam h3 { font-size: 0.95rem; font-family: var(--font-mono); font-weight: 500; margin-bottom: 0.9rem; color: var(--ink-dim); text-transform: uppercase; letter-spacing: 0.06em; }
.bar-row { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.6rem; font-family: var(--font-mono); font-size: 0.78rem; }
.bar-row .track { flex: 1; height: 10px; background: var(--line); border-radius: 2px; overflow: hidden; }
.bar-row .fill { height: 100%; background: var(--ink-dim); }
.bar-row .fill.signal { background: var(--signal); }
.beam .verdict { margin-top: 1rem; font-size: 0.85rem; }
.beam.bad .verdict { color: var(--signal); }
.beam.good .verdict { color: var(--good); }
.equation {
  font-family: var(--font-mono); text-align: center; font-size: clamp(1rem, 2.4vw, 1.35rem);
  padding: 1.6rem; border: 1px dashed var(--line); border-radius: 4px; color: var(--ink);
}
.equation .k { color: var(--signal); }

.studio { border: 1px solid var(--line); border-radius: 4px; overflow: hidden; background: var(--paper-2); }
.studio-tabs { display: flex; border-bottom: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.78rem; }
.studio-tabs button { all: unset; cursor: pointer; padding: 0.75rem 1.1rem; color: var(--ink-dim); border-right: 1px solid var(--line); }
.studio-tabs button[aria-selected="true"] { color: var(--ink); background: var(--card); }
.studio-tabs button:focus-visible { outline: 2px solid var(--signal); outline-offset: -2px; }
.studio-body { min-height: 300px; }
.panel { display: none; padding: 1.2rem; }
.panel.active { display: block; }

.mesh { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.node { font-family: var(--font-mono); font-size: 0.75rem; padding: 0.45rem 0.7rem; border: 1px solid var(--line); border-radius: 3px; color: var(--ink-dim); background: var(--card); }
.node.model { color: var(--ink); border-color: var(--signal); }

.ledger-row {
  display: grid; grid-template-columns: 5.5rem 1fr auto; gap: 0.9rem; align-items: baseline;
  font-family: var(--font-mono); font-size: 0.8rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line);
  opacity: 0; animation: rowIn .5s ease forwards;
}
.ledger-row .t { color: var(--ink-dim); }
.ledger-row .q { color: var(--ink); }
.ledger-row .k { color: var(--signal); }
@keyframes rowIn { to { opacity: 1; } }
.studio-note { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-dim); padding: 0.7rem 1.2rem; border-top: 1px solid var(--line); background: var(--paper-2); }

table.evidence { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 0.85rem; }
table.evidence th, table.evidence td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line); }
table.evidence th { color: var(--ink-dim); font-weight: 500; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; }
table.evidence td.num { font-variant-numeric: tabular-nums; }
.evidence-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 4px; }
.caveat { margin-top: 1.2rem; font-size: 0.9rem; color: var(--ink-dim); }

footer { padding: clamp(3rem, 7vw, 5rem) 0; border-top: 1px solid var(--line); }
.foot-grid { display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; flex-wrap: wrap; }
.foot-grid .install { font-family: var(--font-mono); font-size: 0.95rem; background: var(--ink); color: var(--paper); padding: 0.9rem 1.2rem; border-radius: 3px; }
.foot-links { display: flex; gap: 1.4rem; font-family: var(--font-mono); font-size: 0.82rem; }
.foot-links a { text-decoration: none; color: var(--ink-dim); }
.foot-links a:hover { color: var(--signal); }

@media (max-width: 720px) {
  .balance { grid-template-columns: 1fr; }
  .stage-foot { grid-template-columns: 1fr; }
  .stage-foot div { border-right: none; border-bottom: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .stage-head .live .pip { animation: none; }
  .ledger-row { opacity: 1; animation: none; }
  html { scroll-behavior: auto; }
}