/* Flint pro web — mirrors ui/style.py dark palette + design tokens
   Signature type voices:
   Geist (display)  — human guidance: headings & UI copy
   JetBrains Mono   — machine/evidence: readouts, hashes, eyebrows, status */
@font-face { font-family: "Geist"; src: url("fonts/geist-sans-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Geist"; src: url("fonts/geist-sans-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "Geist"; src: url("fonts/geist-sans-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url("fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url("fonts/jetbrains-mono-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url("fonts/jetbrains-mono-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }

:root {
  /* Palette — identical to the app's dark palette (ui/style.py, _PALETTES["dark"]).
     Alphatints below are derived from app colors, not new hues. */
  --bg: #0a0a0a;
  --card: #0e0e0e;
  --border: #1f1f1f;
  --track: #1a1a1a;
  --menu-hover: #262626;
  --text: #ffffff;
  --muted: #a8a8a8;   /* body + secondary text (>= 4.5:1 on all surfaces) */
  --faded: #6f6f6f;   /* disabled / truly optional text (app palette value) */
  --primary: #ffffff;
  --on-primary: #000000;
  --error: #ff4444;
  --success: #2ecc71;
  --warning: #ffb300;
  /* Derived tokens (from the palette values above) */
  --primary-hover: #f0f0f0;           /* pressed state of the white button */
  --bg-alpha: rgba(10, 10, 10, 0.94); /* sticky header glass */
  --warning-tint: rgba(255, 179, 0, 0.05); /* safety panel wash */
  --warning-soft: rgba(255, 179, 0, 0.22); /* safety panel border */

  /* Type scale — tiers mirror ui/style.py DESIGN_TOKENS (font_xs…font_xl);
     the web base sits one tier up (14px = font_md) for screen reading distance. */
  --fs-xs: 10px;   /* machine caps: eyebrows, table headers, toolbar labels */
  --fs-sm: 11px;   /* chips, meta, status, footer strip, inline mono */
  --fs-base: 13px; /* nav links, buttons, card copy, tables */
  --fs-md: 14px;   /* body base */
  --fs-lg: 16px;   /* card-level h3 */
  --fs-h3: 17px;   /* in-document h3 */
  --fs-xl: 22px;   /* in-document h2 */
  --fs-display: clamp(36px, 6vw, 62px);
  --fs-display-page: clamp(26px, 4vw, 36px);
  --fs-section: clamp(22px, 3.4vw, 30px);
  --fs-lead: clamp(15px, 2.2vw, 17px);

  --lh-tight: 1.12;   /* hero display */
  --lh-head: 1.15;    /* page-head display */
  --lh-snug: 1.25;    /* section h2, in-document h2 */
  --lh-base: 1.4;     /* h3/h4 */
  --lh-relaxed: 1.5;  /* lead */
  --lh-body: 1.6;     /* body */
  --lh-code: 1.7;     /* code blocks */

  --tracking-hero: -1.25px;
  --tracking-head: -0.3px;
  --tracking-eyebrow: 1.5px; /* all mono caps share one tracking */
  --tracking-mono: 0.5px;    /* footer strip */

  /* Space scale — same tiers as ui/style.py DESIGN_TOKENS (space_xs…space_xl),
     extended for the web's longer sections */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-3xl: 32px;
  --space-4xl: 40px;
  --space-5xl: 56px;
  --space-6xl: 80px;

  --nav-h: 60px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-btn: 7px;
  --accent-w: 2px;       /* accent left-bar width (web + app callouts) */

  --maxw: 1080px;
  --font: "Geist", "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Mono", "Cascadia Code", Consolas, ui-monospace, "SF Mono", Menlo, monospace;
  --t-fast: 120ms ease-out;
  --t-standard: 150ms ease-out;
  --shadow-inner-subtle: inset 0 1px 0 rgba(255, 255, 255, 0.03);
  --shadow-glow: 0 32px 64px -28px rgba(255, 255, 255, 0.07);
  /* Breakpoint tokens. Documentation only: CSS custom properties are not
     valid inside @media queries, so queries below keep literal px and
     reference the matching token in a comment. */
  --bp-mobile: 480px;
  --bp-tablet: 780px;
  --bp-desktop: 900px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--primary); color: var(--on-primary); }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--radius-sm); }
::-webkit-scrollbar-thumb:hover { background: var(--faded); }
html { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }

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

:focus-visible {
  outline: 2px solid var(--muted);
  outline-offset: 2px;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-2xl); }

/* Visually hidden: screen-reader-only content (skip link, live regions) */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link: first tab stop, slides in on focus */
.skip-link {
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 100;
  padding: var(--space-sm) var(--space-lg);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--text);
  font-size: var(--fs-base);
  transform: translateY(-200%);
  transition: transform var(--t-standard);
}
.skip-link:focus-visible { transform: none; }

/* ---------- Utilities ---------- */
.mt-20 { margin-top: var(--space-xl); }
.mt-22 { margin-top: var(--space-xl); }
.mt-24 { margin-top: var(--space-2xl); }
.mt-26 { margin-top: var(--space-2xl); }
.cta-left { justify-content: flex-start; }
.cta-gap { margin: 18px 0 26px; }

/* ---------- Header ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-alpha);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  height: var(--nav-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: var(--fs-md);
  font-weight: 500;
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.brand .sub { color: var(--muted); font-weight: 400; font-size: var(--fs-sm); }

.nav-links {
  display: flex;
  gap: var(--space-xs);
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  color: var(--muted);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  transition: color var(--t-standard), background var(--t-standard);
}
.nav-links a:hover { color: var(--text); background: var(--track); }
.nav-links a:active { background: var(--menu-hover); }
.nav-links a.active { color: var(--text); background: var(--track); }

/* White pill CTA in the nav = btn-primary, compact variant */
.btn-nav { padding: 7px 16px; margin-left: var(--space-sm); }

.nav-toggle {
  display: flex;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-btn);
  width: 40px;
  height: 40px;
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle:hover { background: var(--track); color: var(--text); }
.nav-toggle:active { background: var(--menu-hover); }
/* = var(--bp-tablet) + 1px (toggle hidden above tablet width) */
@media (min-width: 781px) { .nav-toggle { display: none; } }

/* ---------- Hero ---------- */
/* Blueprint grid + LED glow: precision-equipment backdrop, fades toward fold */
.hero { position: relative; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(640px 420px at 50% 62%, rgba(255, 255, 255, 0.07), transparent 70%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 72px);
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent);
  mask-image: linear-gradient(to bottom, #000 55%, transparent);
  pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }

/* Heading scale hierarchy:
   .hero h1     var(--fs-display)      — index hero display type (largest)
   .page-head h1 var(--fs-display-page) — subpage hero titles
   .block h2    var(--fs-section)      — section titles on index
   .page-body h2 var(--fs-xl) / h3 var(--fs-h3) / h4 var(--fs-lg) — in-document headings */
.hero {
  padding: var(--space-6xl) 0 var(--space-5xl);
  text-align: center;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.hero > .container > * {
  animation: rise 160ms ease-out backwards;
}
.hero h1 { animation-delay: 80ms; }
.hero .lead { animation-delay: 120ms; }
.hero .cta-row { animation-delay: 160ms; }
.hero .meta { animation-delay: 200ms; }
.hero .mockup { animation-delay: 240ms; }
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
}

.logo-badge, .hero .meta span, .chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--muted);
  font-size: var(--fs-sm);
}
.logo-badge { gap: 10px; padding: 6px 16px; margin-bottom: var(--space-2xl); }
.logo-badge b { color: var(--text); font-weight: 600; }
.hero .meta span { gap: 8px; padding: 5px 12px; }
.hero h1 {
  font-size: var(--fs-display);
  font-weight: 500;
  letter-spacing: var(--tracking-hero);
  line-height: var(--lh-tight);
  max-width: 900px;
  margin: 0 auto var(--space-lg);
}
.hero h1 .accent { color: var(--muted); font-weight: 400; }
.hero .lead {
  color: var(--muted);
  font-size: var(--fs-lead);
  line-height: var(--lh-relaxed);
  max-width: 700px;
  margin: 0 auto 34px;
}
.cta-row { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px var(--space-2xl);
  border-radius: var(--radius-btn);
  font-size: var(--fs-base);
  font-weight: 500;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--t-standard), color var(--t-standard), border-color var(--t-standard);
}
.btn:focus-visible { outline: 2px solid var(--muted); outline-offset: 2px; }
.btn:active { background: var(--track); }
.btn-primary { background: var(--primary); border: 1px solid transparent; color: var(--on-primary); }
.btn-primary:hover { background: var(--primary); color: var(--on-primary); }
.btn-primary:active { background: var(--primary-hover); color: var(--on-primary); }
.btn-ghost { border-color: var(--border); color: var(--muted); }
.btn-ghost:hover { background: var(--track); color: var(--text); }
.btn-sm { padding: 7px var(--space-lg); font-size: var(--fs-sm); }

.hero .meta {
  margin-top: 26px;
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}
.whats-new {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: var(--fs-sm);
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--faded);
  transition: color var(--t-standard), text-decoration-color var(--t-standard);
}
.whats-new:hover { color: var(--text); text-decoration-color: var(--text); }

/* ---------- Sections ---------- */
section.block { padding: var(--space-5xl) 0; border-bottom: 1px solid var(--border); }
section.block:last-child { border-bottom: none; }
/* Scanline: one sweep along the section border when it scrolls into view */
section.block { position: relative; }
section.block::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text) 50%, transparent);
  opacity: 0;
  transform: scaleX(0);
  pointer-events: none;
}
section.block.scanned::after { animation: scan 800ms var(--t-standard) forwards; }
@keyframes scan {
  0% { opacity: 1; transform: scaleX(0); }
  100% { opacity: 0; transform: scaleX(1); }
}
.eyebrow {
  color: var(--muted);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  font-size: var(--fs-xs);
  font-weight: 600;
  margin-bottom: 10px;
}
.block h2 {
  font-size: var(--fs-section);
  font-weight: 500;
  letter-spacing: var(--tracking-head);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-md);
}
.block .intro { color: var(--muted); font-size: var(--fs-md); max-width: 720px; margin-bottom: var(--space-3xl); }

/* ---------- Card surfaces ---------- */
/* Shared "surface" recipe — the app's QFrame#driveCard pattern
   (card bg + 1px border + radius-lg + inner highlight) */
.card, .step, .faq details, .note, .docs-toc, .mockup, .safety {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-inner-subtle);
}

/* Feature grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-lg); }
.card {
  padding: var(--space-xl) 22px;
  position: relative;
  transition: border-color var(--t-standard), transform var(--t-standard), background var(--t-standard);
}
.card:hover { border-color: var(--muted); transform: translateY(-1px); }
.icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--track);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--text);
}
.card h3 { font-size: var(--fs-lg); font-weight: 600; margin-bottom: var(--space-sm); }
.card p { color: var(--muted); font-size: var(--fs-base); }

/* Bento: wide hero cells carry a live-feel mono visual */
.bento { grid-template-columns: repeat(3, 1fr); }
.card--wide { grid-column: span 2; padding: var(--space-xl) var(--space-2xl); }
.card--wide p { max-width: 560px; }
.drop-mock {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-md);
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  color: var(--muted);
}
.mock-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  color: var(--text);
  font-size: var(--fs-sm);
  white-space: nowrap;
}
.mock-chip.ok { color: var(--success); }
.mock-arrow { color: var(--muted); flex: none; }
.readout {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  color: var(--muted);
}
.readout-cap {
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  font-weight: 600;
  color: var(--muted);
}
.readout-line { color: var(--text); }
.ro-ok { color: var(--success); font-weight: 600; }

/* Spotlight hover: soft cursor-follow glow (JS writes --mx/--my) */
.card::after, .step::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgba(255, 255, 255, 0.05), transparent 65%);
  opacity: 0;
  transition: opacity var(--t-standard);
  pointer-events: none;
}
.card:hover::after, .step:hover::after { opacity: 1; }
@media (hover: none) {
  .card::after, .step::after { opacity: 0; }
}

/* Safety banner — the brand's moral center gets the warning wash */
.safety {
  background: var(--warning-tint);
  border-color: var(--warning-soft);
  border-left: var(--accent-w) solid var(--warning);
  padding: var(--space-xl) 22px;
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}
.safety .icon {
  flex: none;
  margin: 2px 0 0 0;
  color: var(--warning);
  background: rgba(255, 179, 0, 0.08);
  border-color: var(--warning-soft);
}
.safety h3 { font-size: var(--fs-lg); font-weight: 600; margin-bottom: var(--space-xs); }
.safety p, .safety ul { color: var(--muted); font-size: var(--fs-base); }
.safety ul { margin: 10px 0 0 18px; }
.safety li { margin-bottom: var(--space-xs); }

/* Steps — numbered mono chips; index uses a 3-up grammar like the app's Flash screen */
.steps { counter-reset: step; display: grid; gap: var(--space-md); }
.step {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-xl) 22px;
  position: relative;
  transition: border-color var(--t-standard), transform var(--t-standard);
}
.step:hover { border-color: var(--muted); transform: translateY(-1px); }
.step .num {
  counter-increment: step;
  flex: 0 0 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--track);
  border: 1px solid var(--border);
  color: var(--muted);
  display: flex; align-items: center; justify-content: center;
}
.step .num::before { content: counter(step); font-family: var(--mono); font-size: var(--fs-base); }
.step h3 { font-size: var(--fs-lg); font-weight: 600; margin-bottom: var(--space-xs); }
.step p { color: var(--muted); font-size: var(--fs-base); }
section.block .steps { grid-template-columns: repeat(3, 1fr); }
.docs-content .steps { grid-template-columns: 1fr; }

/* ---------- Code ---------- */
.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--card);
  margin: var(--space-xl) 0;
}
.code-block .code-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: var(--space-sm) var(--space-md);
}
.code-toolbar .label {
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  font-weight: 600;
}
.code-block pre.code {
  background: var(--bg);
  border: none;
  border-radius: 0;
  margin: 0;
  padding: var(--space-lg) var(--space-xl);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: var(--fs-base);
  line-height: var(--lh-code);
  color: var(--text);
}
.copy-btn {
  background: var(--track);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius-btn);
  padding: 5px var(--space-md);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: color var(--t-standard), border-color var(--t-standard), background var(--t-standard);
}
.copy-btn:hover { color: var(--text); border-color: var(--muted); background: var(--track); }
.copy-btn:active { background: var(--track); }

/* ---------- Docs: command reference cards ---------- */
.cmd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.cmd {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-inner-subtle);
  transition: border-color var(--t-standard);
}
.cmd:hover { border-color: var(--muted); }
.cmd .cmd-name { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.cmd .cmd-name code {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
}
.cmd .cmd-badge {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--faded);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 7px;
}
.cmd p { color: var(--muted); font-size: 13px; line-height: 1.6; margin: 0 0 12px; }
.cmd pre {
  margin: 0;
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--faded);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- Tables ---------- */
.table-scroll { overflow-x: auto; }
table.docs { width: 100%; border-collapse: collapse; margin: var(--space-xl) 0; font-size: 13.5px; }
table.docs th, table.docs td { text-align: left; padding: 13px var(--space-lg); border-bottom: 1px solid var(--border); }
table.docs th {
  color: var(--muted);
  font-family: var(--mono);
  font-weight: 600;
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
}
table.docs td { color: var(--text); }
table.docs th[scope="row"] { font-family: var(--mono); font-size: var(--fs-sm); letter-spacing: 0; text-transform: none; color: var(--text); }

/* Shared inline-code chip (app: QLineEdit#shaInput, mono at font_sm) */
table.docs code, .faq details code, .page-body code, .note code {
  background: var(--track);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--mono);
  font-size: var(--fs-sm);
}

/* ---------- FAQ ---------- */
.faq details {
  margin-bottom: var(--space-md);
  padding: var(--space-lg) 22px;
  scroll-margin-top: calc(var(--nav-h) + var(--space-2xl));
  transition: border-color var(--t-standard);
}
.faq details:hover { border-color: var(--muted); }
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--fs-lg);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  width: 7px; height: 7px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--t-standard);
}
.faq details[open] summary::after { transform: rotate(-135deg) translate(-2px, -2px); }
.faq details p, .faq details ul { margin-top: var(--space-md); color: var(--muted); font-size: var(--fs-base); }

/* ---------- Callout ---------- */
.note {
  border-left: var(--accent-w) solid var(--primary);
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--fs-base);
  color: var(--muted);
margin: var(--space-xl) 0;
  transition: border-color var(--t-standard);
}
.note:hover { border-color: var(--muted); }
.note strong { color: var(--text); font-weight: 600; }
.note.warn { border-left-color: var(--warning); }
.note.error { border-left-color: var(--error); }
.note.ok { border-left-color: var(--success); }

/* ---------- Links in prose ---------- */
.page-body a, .note a, .faq details a, .footer-col a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--faded);
  transition: color var(--t-standard);
}
.page-body a:hover, .note a:hover, .faq details a:hover, .footer-col a:hover {
  color: var(--text);
  text-decoration-color: var(--text);
}

/* ---------- Page hero (subpages) ---------- */
.page-head, .docs-head { padding: var(--space-5xl) 0 36px; border-bottom: 1px solid var(--border); }
.docs-head { grid-area: head; }
.page-head h1, .docs-head h1 {
  font-size: var(--fs-display-page);
  font-weight: 500;
  letter-spacing: var(--tracking-head);
  line-height: var(--lh-head);
  margin-bottom: 10px;
}
.page-head p, .docs-head p { color: var(--muted); font-size: var(--fs-md); max-width: 720px; }
.page-body { padding: var(--space-4xl) 0 var(--space-6xl); }
.page-body h2 {
  font-size: var(--fs-xl);
  font-weight: 500;
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-head);
  margin: 48px 0 var(--space-md);
  scroll-margin-top: calc(var(--nav-h) + var(--space-2xl));
}
.page-body h3 {
  font-size: var(--fs-h3);
  font-weight: 500;
  line-height: var(--lh-base);
  margin: var(--space-3xl) 0 10px;
  scroll-margin-top: calc(var(--nav-h) + var(--space-2xl));
}
.page-body h4 {
  font-size: var(--fs-lg);
  font-weight: 500;
  line-height: var(--lh-base);
  margin: var(--space-2xl) 0 var(--space-sm);
  color: var(--text);
}
.page-body p, .page-body li { color: var(--muted); font-size: var(--fs-md); }
.page-body p { margin-bottom: var(--space-md); max-width: 760px; }
.page-body p strong { color: var(--text); font-weight: 600; }
.page-body ul, .page-body ol { margin: 0 0 var(--space-md) 22px; }
.page-body li { margin-bottom: var(--space-xs); }

/* ---------- kbd & chips ---------- */
kbd {
  background: var(--track);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  padding: 1px 7px;
  font-family: var(--mono);
  font-size: var(--fs-sm);
  color: var(--text);
}
.chip {
  padding: 2px 12px;
  gap: 8px;
  font-size: var(--fs-sm);
}
.chip.on { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.chip.ok { color: var(--success); border-color: var(--border); }

/* ---------- Footer ---------- */
footer.site { border-top: 1px solid var(--border); padding: var(--space-4xl) 0 var(--space-3xl); }
.footer-grid { display: flex; gap: var(--space-4xl); justify-content: space-between; flex-wrap: wrap; }
.footer-col h4 {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  font-weight: 600;
  color: var(--muted);
  margin-bottom: var(--space-md);
}
.footer-col a { display: block; font-size: var(--fs-base); padding: 3px 0; }
.footer-brand { max-width: 260px; }
.footer-brand .name { display: flex; align-items: center; gap: var(--space-sm); color: var(--text); font-size: var(--fs-md); font-weight: 500; margin-bottom: var(--space-sm); }
.footer-brand .name svg { display: block; }
.footer-brand p { color: var(--muted); font-size: var(--fs-sm); line-height: 1.5; }
.footer-gh {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: var(--fs-sm);
  color: var(--muted);
  transition: color var(--t-standard);
}
.footer-gh:hover { color: var(--text); }
.footer-bottom {
  margin-top: 34px;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-mono);
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ---------- Docs layout: sticky TOC + content ---------- */
.docs-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  grid-template-areas: "toc head" "toc content";
  gap: var(--space-5xl);
  align-items: start;
}
.docs-toc {
  grid-area: toc;
  position: sticky;
  top: calc(var(--nav-h) + var(--space-2xl));
  padding: var(--space-2xl) 18px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}
.docs-toc h4 {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  font-weight: 600;
  color: var(--muted);
  margin-bottom: var(--space-lg);
}
.docs-toc .toc-part {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--muted);
  margin: 18px 10px 4px;
}
.docs-toc .toc-part:first-of-type { margin-top: 0; }
.docs-toc a {
  display: block;
  color: var(--muted);
  font-size: var(--fs-base);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  border-left: 2px solid transparent;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}
.docs-toc a:hover { color: var(--text); background: var(--track); }
.docs-toc a.sub { padding-left: 26px; color: var(--muted); font-size: 12px; }
.docs-toc a.active { color: var(--text); border-left-color: var(--primary); background: var(--track); }
.docs-toc-inner { display: contents; }
.docs-content { min-width: 0; grid-area: content; }
.docs-content h2 { scroll-margin-top: calc(var(--nav-h) + var(--space-2xl)); margin-top: var(--space-4xl); }
.docs-content h3 { margin-top: var(--space-4xl); }
.docs-content p { line-height: 1.75; }
.docs-content li { line-height: 1.7; margin-bottom: var(--space-sm); }
.docs-part {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-top: 72px;
  padding: 18px var(--space-xl);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.docs-part span {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--muted);
}
.docs-part strong { font-size: 18px; font-weight: 600; letter-spacing: -0.2px; }
.docs-part + h2 { margin-top: var(--space-3xl); }
#docsTop { scroll-margin-top: calc(var(--nav-h) + var(--space-2xl)); }
/* = var(--bp-desktop) */
@media (max-width: 900px) {
  .docs-layout {
    grid-template-columns: 1fr;
    grid-template-areas: "head" "toc" "content";
    gap: var(--space-2xl);
  }
  .docs-toc {
    position: static;
    max-height: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 2px;
  }
  .docs-toc h4 { grid-column: 1 / -1; }
  .docs-toc .toc-part { grid-column: 1 / -1; margin: 10px 6px 2px; }
  .docs-toc a { border-left: none; padding: 6px 10px; }
}

/* ---------- App screenshot (hero) ---------- */
.mockup {
  position: relative;
  max-width: 640px;
  margin: 48px auto 0;
  background: var(--bg);
  overflow: hidden;
  box-shadow: var(--shadow-inner-subtle), var(--shadow-glow);
}
.mockup::before {
  content: "";
  position: absolute;
  inset: -7px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  z-index: -1;
}
.mockup-shot { display: block; width: 100%; height: auto; }
/* Firmware readout strip: mono, machine voice, success "recording" dot */
.status-strip {
  margin: 26px auto 0;
  max-width: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  color: var(--muted);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.status-strip .rec { width: 7px; height: 7px; border-radius: 50%; background: var(--success); flex: none; }
.status-strip .rec::after {
  content: "";
  display: block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.8); }
}

/* ---------- Back to top (docs) ---------- */
.to-top {
  position: fixed;
  right: var(--space-2xl);
  bottom: var(--space-2xl);
  z-index: 40;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--track);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--t-standard), transform var(--t-standard),
              background var(--t-standard), border-color var(--t-standard),
              visibility 0s linear var(--t-standard);
}
.to-top.show { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
.to-top:hover { color: var(--text); border-color: var(--muted); background: var(--menu-hover); }
.to-top:active { background: var(--border); }

/* ---------- 404 ---------- */
.nf {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 18px;
  padding: var(--space-5xl) var(--space-2xl);
}
.nf .code {
  font-size: clamp(48px, 12vw, 64px);
  font-weight: 500;
  color: var(--text);
  letter-spacing: -1px;
}
.nf .msg { color: var(--muted); max-width: 420px; font-size: var(--fs-md); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero > .container > *,
  section.block.scanned::after,
  .status-strip .rec::after { animation: none; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- Responsive ---------- */
/* = var(--bp-desktop): bento collapses to 2-up, docs TOC to a rail */
@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
}
/* = var(--bp-tablet) */
@media (max-width: 780px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md);
    gap: var(--space-xs);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity var(--t-standard), transform var(--t-standard),
                visibility 0s linear var(--t-standard);
  }
  .nav-links.open {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    transition-delay: 0s;
  }
  .nav-links a { width: 100%; }
  .nav-links .btn-nav { margin-left: 0; text-align: center; }
  .hero { padding: var(--space-5xl) 0 48px; }
  section.block { padding: var(--space-4xl) 0; }
  section.block .steps { grid-template-columns: 1fr; }
}
/* = var(--bp-mobile) */
@media (max-width: 480px) {
  .bento { grid-template-columns: 1fr; }
  .card--wide { grid-column: span 1; padding: var(--space-xl) 22px; }
  .mockup { margin-top: 36px; }
  .mockup::before { inset: -4px; }
  .status-strip {
    letter-spacing: 0.5px;
    white-space: normal;
    text-align: center;
  }
  .hero { padding: var(--space-4xl) 0 var(--space-3xl); }
  .footer-grid { gap: var(--space-3xl); }
  .footer-brand { max-width: none; }
}

/* ---------- Docs extras: permalinks, TOC search, progress bar, pager, chips ---------- */
.docs-content h3 { scroll-margin-top: calc(var(--nav-h) + var(--space-2xl)); }
.anchor {
  opacity: 0;
  margin-left: var(--space-sm);
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: opacity var(--t-standard), color var(--t-standard);
}
.docs-content h2:hover .anchor,
.docs-content h3:hover .anchor,
.docs-content h2:focus-within .anchor,
.docs-content h3:focus-within .anchor { opacity: 1; }
.anchor:hover { color: var(--primary); }

.toc-search {
  width: 100%;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--mono);
  font-size: var(--fs-base);
}
.toc-search::placeholder { color: var(--faded); }
.toc-search:focus { outline: none; border-color: var(--muted); }
.toc-search.no-hit { border-color: var(--error); }
.docs-toc .toc-links { display: block; }
.docs-toc .toc-links a.hidden, .docs-toc .toc-part.hidden { display: none; }

.progress-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  height: 2px;
  width: 0;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.35);
  z-index: 90;
  pointer-events: none;
}

.part-nav {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-5xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--border);
}
.part-nav a {
  padding: var(--space-sm) var(--space-md);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.part-nav a:hover { color: var(--text); border-color: var(--muted); background: var(--track); }
.part-nav .next { margin-left: auto; }

.part-chips { display: none; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-2xl); }
.part-chips a {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.part-chips a:hover { color: var(--text); border-color: var(--muted); }

@media (max-width: 900px) {
  .part-chips { display: flex; }
  .toc-search { grid-column: 1 / -1; }
  .toc-links { display: contents; }
}

/* ---------- Syntax tinting (pre blocks) ---------- */
.tok-flag { color: var(--primary); font-weight: 600; }
.tok-ph { color: var(--warning); }
.tok-path { color: var(--success); }
.tok-env, .tok-var { color: var(--muted); }

/* ---------- Print: dark palette inverts, furniture hides ---------- */
@media print {
  :root {
    --bg: #ffffff;
    --text: #111111;
    --muted: #444444;
    --faded: #6f6f6f;
    --card: #ffffff;
    --border: #cccccc;
    --track: #f0f0f0;
    --menu-hover: #e8e8e8;
    --primary: #000000;
  }
  .site, .skip-link, .to-top, .progress-bar, .part-chips,
  .docs-toc, .toc-search, .part-nav { display: none !important; }
  .docs-layout { display: block; }
  section.page-head, .docs-head { padding-bottom: var(--space-2xl); }
  .docs-content h2 { break-before: page; }
  .docs-content h2:first-of-type { break-before: auto; }
  .code-block, .cmd, .note, .safety, table.docs { break-inside: avoid; }
  pre { white-space: pre-wrap; }
  .table-scroll { overflow: visible; }
  .anchor { display: none; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 9px; }
}

/* ---------- Docs: wide floating layout on large screens ---------- */
@media (min-width: 1280px) {
  .container.docs-layout {
    max-width: 1440px;
    padding-inline: var(--space-3xl);
  }
  .docs-layout {
    grid-template-columns: 280px minmax(0, 1fr);
    grid-template-areas: "toc head" "toc content";
    gap: var(--space-6xl);
    align-items: start;
  }
  .docs-content {
    --fs-sm: 12px;
    --fs-base: 14px;
    --fs-md: 15px;
    --fs-lg: 17px;
    --fs-h3: 18px;
    --fs-xl: 23px;
  }
  .docs-content .table-scroll table.docs { font-size: 14px; }
}