:root {
  color-scheme: light;
  --brand: #a32a29;
  --brand-strong: #8a2221;
  --brand-tint: #f8ece9;
  --canvas: #faf8f5;
  --surface: #ffffff;
  --surface-2: #f4f1ec;
  --ink: #201d1c;
  --ink-2: #4a4642;
  --muted: #8b8681;
  --line: #e8e3dd;
  --line-strong: #d6cfc7;
  --sidebar: #201d1c;
  --sidebar-ink: #e9e5e0;
  --sidebar-muted: #9b958f;
  --error: #b3261e;
  --error-tint: #fbeae8;
  --warning: #b7791f;
  --warning-tint: #fbf1e0;
  --success: #3f7d3f;
  --success-tint: #e9f3e9;
  --info: var(--brand);
  --info-tint: var(--brand-tint);
  --shadow-1: 0 1px 2px rgba(32, 29, 28, 0.04), 0 1px 3px rgba(32, 29, 28, 0.06);
  --shadow-2: 0 2px 4px rgba(32, 29, 28, 0.05), 0 4px 12px rgba(32, 29, 28, 0.08);
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --brand: #d9564d;
  --brand-strong: #e5675e;
  --brand-tint: #2e211f;
  --canvas: #1a1817;
  --surface: #262220;
  --surface-2: #302b28;
  --ink: #f6f4f1;
  --ink-2: #cfc9c3;
  --muted: #9b958f;
  --line: #38332f;
  --line-strong: #47413c;
  --sidebar: #161413;
  --sidebar-ink: #e9e5e0;
  --sidebar-muted: #9b958f;
  --error: #ef6a5f;
  --error-tint: #3a1f1c;
  --warning: #e0a23a;
  --warning-tint: #35291a;
  --success: #6fb36f;
  --success-tint: #1f2c1f;
  --info: var(--brand);
  --info-tint: var(--brand-tint);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0 !important;
  display: grid !important;
  grid-template-columns: 264px minmax(0, 1fr);
  min-height: 100vh;
  background: var(--canvas) !important;
  color: var(--ink) !important;
  font: 16px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif !important;
  font-feature-settings: 'cv11', 'ss01';
  -webkit-font-smoothing: antialiased;
}

nav {
  position: sticky !important;
  top: 0;
  width: auto !important;
  height: 100vh !important;
  padding: 20px 14px 28px !important;
  overflow: auto;
  background: var(--sidebar) !important;
  border-right: 1px solid rgba(255, 255, 255, 0.06) !important;
  color: var(--sidebar-ink);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding: 0 8px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
}
.brand-title { color: #fff; font-size: 13.5px; font-weight: 600; line-height: 1.25; }
.brand-subtitle {
  display: block;
  margin-top: 2px;
  color: var(--sidebar-muted);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
nav h3 {
  margin: 0 !important;
  padding: 14px 10px 5px !important;
  border: 0 !important;
  color: var(--sidebar-muted) !important;
  font-size: 9.5px !important;
  letter-spacing: 0.14em !important;
}
nav ul { margin: 0; padding: 0; list-style: none; }
nav ul li { margin: 0 !important; }
nav a {
  display: flex !important;
  align-items: baseline;
  gap: 9px;
  padding: 6px 10px !important;
  border-radius: 8px !important;
  color: #cfc9c3 !important;
  font-size: 13px !important;
  line-height: 1.35;
  text-decoration: none;
  transition: 0.12s;
}
nav a:hover { background: rgba(255, 255, 255, 0.06) !important; color: #fff !important; }
nav a.active { background: var(--brand) !important; color: #fff !important; font-weight: 600; }
nav .nav-number { min-width: 15px; font-size: 10px; font-variant-numeric: tabular-nums; opacity: 0.75; }
.nav-footer { margin-top: 18px; padding: 12px 10px 0; border-top: 1px solid rgba(255, 255, 255, 0.08); }
.theme-toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: transparent;
  color: #cfc9c3;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}
.theme-toggle:hover { background: rgba(255, 255, 255, 0.06); color: #fff; }

main {
  width: 100% !important;
  max-width: 1080px !important;
  min-width: 0;
  min-height: 100vh;
  margin: 0 !important;
  padding: 28px 34px 80px !important;
  background: transparent !important;
  box-shadow: none !important;
}
.hero {
  margin-bottom: 22px;
  padding: 36px 34px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}
.kicker { margin: 0; color: var(--brand); font-size: 10.5px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
h1 { margin: 12px 0 10px !important; color: var(--ink) !important; font-size: clamp(28px, 3.2vw, 38px) !important; line-height: 1.12; letter-spacing: -0.015em !important; }
.subtitle { max-width: 70ch; margin: 0 !important; color: var(--ink-2) !important; font-size: 17px !important; line-height: 1.5; }
.chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 20px; }
.chip { padding: 4px 11px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface-2); color: var(--ink-2); font-size: 11.5px; font-weight: 600; }
.chip.brand-chip { border-color: color-mix(in srgb, var(--brand) 25%, transparent); background: var(--brand-tint); color: var(--brand); }

.flow-figure {
  margin: 18px 0 !important;
  padding: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}
.flow-figure img { display: block; width: 100%; max-width: 100%; height: auto; border-radius: 8px; background: #fff; }
.flow-figure figcaption { margin-top: 12px !important; color: var(--muted) !important; font-size: 12px !important; font-style: normal !important; text-align: left; }

section {
  margin: 18px 0 !important;
  padding: 26px 28px;
  scroll-margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-1);
}
section h2 {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 0 0 12px !important;
  padding: 0 0 12px !important;
  border-bottom: 1px solid var(--line) !important;
  color: var(--ink) !important;
  font-size: 22px !important;
  line-height: 1.25;
  letter-spacing: -0.015em !important;
}
p { color: var(--ink-2) !important; }
strong, b { color: var(--ink); }
ul, ol { color: var(--ink-2); }
li { margin: 6px 0; }
li::marker { color: var(--muted); }
ol li ul li::before { color: var(--brand) !important; }
code { padding: 2px 6px !important; border-radius: 5px !important; background: var(--surface-2) !important; color: var(--ink) !important; font: 12.5px 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace !important; }

table { width: 100%; margin: 16px 0 !important; overflow: hidden; border: 1px solid var(--line); border-radius: 12px !important; border-collapse: separate !important; border-spacing: 0; box-shadow: none !important; font-size: 14px; }
th, td { padding: 10px 13px !important; border-bottom: 1px solid var(--line) !important; color: var(--ink-2); }
th { background: var(--surface-2) !important; color: var(--muted) !important; font-size: 10.5px !important; letter-spacing: 0.07em !important; }
tr:last-child td { border-bottom: 0 !important; }
tr:hover td { background: var(--surface-2) !important; }

.note { margin: 16px 0 !important; padding: 13px 16px !important; border: 0 !important; border-left: 3px solid var(--info) !important; border-radius: 0 12px 12px 0 !important; background: var(--info-tint) !important; color: var(--ink-2); font-size: 14.5px !important; }
.note b { color: var(--ink) !important; }
.phase { margin: 14px 0 8px !important; padding: 3px 9px !important; border-radius: 999px !important; font-size: 10px !important; letter-spacing: 0.06em !important; }
.phase--happy { border-color: color-mix(in srgb, var(--success) 35%, transparent) !important; background: var(--success-tint) !important; color: var(--success) !important; }
.phase--unhappy { border-color: color-mix(in srgb, var(--error) 35%, transparent) !important; background: var(--error-tint) !important; color: var(--error) !important; }
.phase--info { border-color: color-mix(in srgb, var(--info) 35%, transparent) !important; background: var(--info-tint) !important; color: var(--info) !important; }

@media (max-width: 900px) {
  body { display: block !important; }
  nav { position: relative !important; width: 100% !important; height: auto !important; }
  nav ul { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
  main { padding: 20px 18px 60px !important; }
  .hero { padding: 28px 22px; }
  section { padding: 20px; }
}

@media print {
  nav { display: none !important; }
  body { display: block !important; }
  main { max-width: none !important; }
  section, .hero, .flow-figure { box-shadow: none; break-inside: avoid; }
}