/* ==========================================================================
   Caribou — caribou.you
   Hand-written stylesheet. No framework, no build step.
   Design system per plan §4. Dark is default; light via prefers-color-scheme.
   All text/background token pairs target WCAG AA 4.5:1 in both themes.
   ========================================================================== */

/* ---- Fonts: self-hosted, Latin subset, variable. No third-party requests. -- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/font/inter.woff2') format('woff2');
}
@font-face {
  font-family: 'Inconsolata';
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url('/font/inconsolata.woff2') format('woff2');
}
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/font/fraunces.woff2') format('woff2');
}

/* ---- Design tokens — warm & natural. Light is default; dark via media. ---- */
:root {
  /* Color — warm light (default): bone paper, pine green, gold */
  --bg: #f7f2e8;
  --surface: #efe7d6;
  --surface-raised: #fffdf7;
  --border: #e4dac4;
  --text: #2c2721;
  --text-secondary: #6a6153;
  --accent: #1f5a44;
  --accent-strong: #1f5a44;
  --accent-contrast: #ffffff;
  --gold: #8f6410;
  --gold-soft: #ddbb6a;
  --shadow: 0 18px 44px rgb(60 45 20 / 0.12);
  --focus: #1f5a44;

  /* Type */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Fraunces', Georgia, 'Times New Roman', 'Times', serif;
  --font-mono: 'Inconsolata', ui-monospace, 'Cascadia Code', 'SF Mono', Menlo, Consolas, monospace;

  /* Scale */
  --step-display: clamp(2.5rem, 6vw, 4.25rem);
  --step-h2: clamp(1.75rem, 3.5vw, 2.5rem);
  --step-h3: 1.25rem;
  --step-body: 1.0625rem;
  --step-small: 0.875rem;

  /* Layout & shape — softer radii read warmer/friendlier than the app's 4px */
  --maxw: 1120px;
  --prose: 72ch;
  --radius-control: 6px;
  --radius-card: 16px;

  /* Spacing (4px scale) */
  --s-1: 0.25rem;  --s-2: 0.5rem;   --s-3: 0.75rem;  --s-4: 1rem;
  --s-6: 1.5rem;   --s-8: 2rem;     --s-12: 3rem;    --s-16: 4rem;
  --section-pad: clamp(4rem, 10vw, 7rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Warm charcoal dark: brown-black, sage/pine, warm gold */
    --bg: #17130d;
    --surface: #1f1a13;
    --surface-raised: #262019;
    --border: #3a3227;
    --text: #f1e9da;
    --text-secondary: #b3a890;
    --accent: #7bbf9f;
    --accent-strong: #2c7d5c;
    --accent-contrast: #ffffff;
    --gold: #d9b25e;
    --gold-soft: #e8ca86;
    --shadow: 0 20px 55px rgb(0 0 0 / 0.5);
    --focus: #7bbf9f;
  }
}

/* ---- Reset / base -------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem; /* clears the sticky header on anchor jumps */
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  font-family: var(--font-sans);
  font-size: var(--step-body);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-synthesis: none;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration: underline; }
strong, b { font-weight: 600; }
p { text-wrap: pretty; }
code, kbd, samp, pre { font-family: var(--font-mono); }

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

/* Headings — Fraunces (warm serif) for the display sizes; Inter for small UI titles.
   text-wrap: balance evens out ragged line breaks (fixes hero orphans). */
h1, h2, h3, h4 { line-height: 1.15; font-weight: 600; letter-spacing: -0.01em; text-wrap: balance; }
h1, h2 { font-family: var(--font-display); letter-spacing: -0.015em; }
h1 { font-size: var(--step-display); line-height: 1.05; }
h2 { font-size: var(--step-h2); line-height: 1.1; }
h3 { font-size: var(--step-h3); }

/* ---- Utilities ----------------------------------------------------------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--s-6); }
.section { padding-block: var(--section-pad); scroll-margin-top: 5rem; }
.section--alt { background: var(--surface); }
.section__head { max-width: 60ch; margin-bottom: var(--s-8); }
.section__head p { color: var(--text-secondary); margin-top: var(--s-3); }
.muted { color: var(--text-secondary); }
.small { font-size: var(--step-small); }
.lead { font-size: 1.1875rem; color: var(--text-secondary); }
.center { text-align: center; }

/* Spacing utilities (avoid inline style attributes — strict CSP has no
   'unsafe-inline' for style-src). */
.mt-4 { margin-top: var(--s-4); }
.mt-6 { margin-top: var(--s-6); }
.mt-8 { margin-top: var(--s-8); }
.mt-12 { margin-top: var(--s-12); }
.ml-auto { margin-left: auto; }

.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 {
  position: absolute; left: var(--s-4); top: -3rem;
  background: var(--accent-strong); color: var(--accent-contrast);
  padding: var(--s-2) var(--s-4); border-radius: var(--radius-control);
  z-index: 100; transition: top 150ms ease-out;
}
.skip-link:focus { top: var(--s-4); }

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font: inherit; font-weight: 600; line-height: 1;
  padding: 0.75rem 1.25rem; border-radius: var(--radius-control);
  border: 1px solid transparent; cursor: pointer;
  text-decoration: none; white-space: nowrap;
  transition: background 150ms ease-out, border-color 150ms ease-out, transform 150ms ease-out;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--accent { background: var(--accent-strong); color: var(--accent-contrast); }
/* Darken on hover and keep white text — readable contrast in both themes. */
.btn--accent:hover { background: color-mix(in srgb, var(--accent-strong) 86%, #000); color: var(--accent-contrast); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--sm { padding: 0.5rem 0.85rem; font-size: var(--step-small); }

/* ---- Header / nav -------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  /* Opaque on purpose. A translucent background + backdrop-filter: blur() on a
     sticky header re-rasterizes everything behind the bar on every scroll
     frame — it pegs CPU/GPU and makes scrolling and anchor smooth-scroll janky.
     A solid background composites for free. */
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: var(--s-6); height: 4rem; }
.brand { display: inline-flex; align-items: center; gap: var(--s-3); font-weight: 600; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; }
.brand span { font-size: 1.125rem; }
.nav__links { display: flex; gap: var(--s-6); margin-left: auto; }
.nav__links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9375rem; }
.nav__links a:hover { color: var(--text); }
.nav__actions { display: flex; align-items: center; gap: var(--s-3); margin-left: var(--s-6); }
.nav__icon { display: inline-flex; color: var(--text-secondary); }
.nav__icon:hover { color: var(--text); }
.nav__icon svg { width: 22px; height: 22px; }

/* On narrow screens the anchor links collapse away (pure CSS, no hamburger). */
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__actions { margin-left: auto; }
}

/* ---- Hero ---------------------------------------------------------------- */
.hero { padding-block: clamp(3rem, 8vw, 6rem); }
.hero__grid { display: grid; gap: clamp(2rem, 5vw, 4rem); align-items: center; grid-template-columns: 1fr; }
@media (min-width: 900px) { .hero__grid { grid-template-columns: 1.05fr 1fr; } }
.hero__title { max-width: 14ch; }
.hero__subhead { margin-top: var(--s-6); max-width: 46ch; font-size: 1.1875rem; color: var(--text-secondary); }
.hero__ctas { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-8); }
.hero__meta { margin-top: var(--s-6); font-size: var(--step-small); color: var(--text-secondary); }

/* ---- Screenshot frame & honest placeholder ------------------------------- */
.frame {
  border: 1px solid var(--border); border-radius: var(--radius-card);
  background: var(--surface-raised); box-shadow: var(--shadow);
  overflow: hidden;
}
.frame__bar { display: flex; gap: 6px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: var(--surface); }
.frame__bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.frame img { width: 100%; height: auto; display: block; }

/* Placeholder that must never be mistaken for a real screenshot (honesty §3). */
.shot-placeholder {
  aspect-ratio: 16 / 10; display: grid; place-content: center; gap: var(--s-2);
  text-align: center; padding: var(--s-8);
  background:
    repeating-linear-gradient(45deg, transparent 0 10px, color-mix(in srgb, var(--border) 30%, transparent) 10px 11px);
  color: var(--text-secondary);
}
.shot-placeholder strong { color: var(--text); font-weight: 600; }
.shot-placeholder .small { max-width: 34ch; }

/* ---- Trust strip --------------------------------------------------------- */
.trust { border-block: 1px solid var(--border); background: var(--surface); }
.trust__row {
  display: flex; flex-wrap: wrap; gap: var(--s-4) var(--s-8);
  padding-block: var(--s-6); align-items: center; justify-content: center;
  font-size: var(--step-small);
}
.trust__row a, .trust__row span { display: inline-flex; align-items: center; gap: var(--s-2); color: var(--text-secondary); text-decoration: none; }
.trust__row a:hover { color: var(--text); }
.trust__row svg { width: 16px; height: 16px; color: var(--accent); flex: none; }

/* ---- Card grids ---------------------------------------------------------- */
.grid { display: grid; gap: var(--s-6); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
@media (min-width: 700px) { .grid--2 { grid-template-columns: 1fr 1fr; } .grid--3 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 980px) { .grid--3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--surface-raised); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: var(--s-8);
  box-shadow: 0 1px 2px rgb(60 45 20 / 0.04), 0 12px 28px rgb(60 45 20 / 0.05);
}
.section--alt .card { background: var(--surface-raised); }
.card h3 { margin-bottom: var(--s-3); }
.card p { color: var(--text-secondary); }
.card__icon { color: var(--accent); margin-bottom: var(--s-4); }
.card__icon svg { width: 28px; height: 28px; }

.badge {
  display: inline-block; font-size: 0.75rem; font-weight: 600; line-height: 1;
  padding: 0.3em 0.6em; border-radius: 999px; letter-spacing: 0.01em;
  color: var(--accent); border: 1px solid var(--accent);
  vertical-align: middle; margin-left: var(--s-2);
}
.note {
  margin-top: var(--s-4); padding: var(--s-4) var(--s-6);
  border-left: 3px solid var(--accent); background: var(--surface-raised);
  border-radius: 0 var(--radius-control) var(--radius-control) 0;
  color: var(--text-secondary); font-size: var(--step-small);
}
.principle-close { margin-top: var(--s-8); max-width: 60ch; color: var(--text-secondary); }

/* ---- Supported assets ---------------------------------------------------- */
.asset-group { margin-top: var(--s-8); }
.asset-group h3 { font-size: 1rem; color: var(--text-secondary); font-weight: 600; margin-bottom: var(--s-4); }
.coins { display: flex; flex-wrap: wrap; gap: var(--s-6); }
.coin { display: flex; align-items: center; gap: var(--s-3); }
/* Coin logos render as-shipped: never clipped, masked, or border-radiused (§4.3). */
.coin img { width: 40px; height: 40px; object-fit: contain; border-radius: 0; }
.coin span { font-weight: 500; }
.coin small { display: block; color: var(--text-secondary); font-size: 0.8125rem; font-weight: 400; }
.chips { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-4); }
.chip {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-size: var(--step-small); padding: 0.35rem 0.7rem;
  border: 1px solid var(--border); border-radius: 999px; color: var(--text-secondary);
}
.chip img { width: 18px; height: 18px; object-fit: contain; }
/* Curated cards carry a chip row at the top instead of an icon. */
.card > .chips:first-child { margin-top: 0; margin-bottom: var(--s-4); }

/* Demoted full asset list — native <details>, zero JS. */
.asset-all { margin-top: var(--s-12); border-top: 1px solid var(--border); }
.asset-all > summary {
  cursor: pointer; list-style: none; padding-top: var(--s-8);
  font-weight: 600; color: var(--accent);
  display: inline-flex; align-items: center; gap: var(--s-2);
}
.asset-all > summary::-webkit-details-marker { display: none; }
.asset-all > summary::after { content: "\203A"; font-size: 1.25em; line-height: 1; transition: transform 200ms ease-out; }
.asset-all[open] > summary::after { transform: rotate(90deg); }
.asset-all > summary:hover { text-decoration: underline; }
.asset-all__inner > .asset-group:first-child { margin-top: var(--s-6); }

/* ---- Screenshot gallery (CSS scroll-snap, zero JS) ----------------------- */
.gallery {
  display: grid; grid-auto-flow: column; grid-auto-columns: min(80%, 460px);
  gap: var(--s-6); overflow-x: auto; scroll-snap-type: x mandatory;
  padding-bottom: var(--s-4); scroll-padding-inline: var(--s-6);
}
.gallery:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }
.gallery > figure { scroll-snap-align: start; }
.gallery figcaption { margin-top: var(--s-3); font-size: var(--step-small); color: var(--text-secondary); }

/* ---- Privacy-of-site strip ----------------------------------------------- */
.privacy-strip { display: grid; gap: var(--s-6); }
@media (min-width: 780px) { .privacy-strip { grid-template-columns: repeat(3, 1fr); } }
.privacy-strip .card__icon { margin-bottom: var(--s-3); }

/* ---- FAQ (native details/summary) --------------------------------------- */
.faq { max-width: var(--prose); }
.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  cursor: pointer; list-style: none; padding: var(--s-6) 0;
  font-weight: 600; font-size: 1.0625rem; display: flex; justify-content: space-between; gap: var(--s-4);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; color: var(--accent); font-weight: 400; font-size: 1.5rem; line-height: 1;
  transition: transform 200ms ease-out;
}
.faq details[open] summary::after { content: "\2212"; } /* minus */
.faq details > *:not(summary) { padding-bottom: var(--s-6); color: var(--text-secondary); max-width: 68ch; }

/* ---- Footer -------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding-block: var(--section-pad) var(--s-12); }
.footer-grid { display: grid; gap: var(--s-8); grid-template-columns: 1fr 1fr; }
@media (min-width: 820px) { .footer-grid { grid-template-columns: 1.4fr repeat(4, 1fr); } }
.footer-brand p { color: var(--text-secondary); font-size: var(--step-small); margin-top: var(--s-4); max-width: 34ch; }
.footer-col h4 { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-secondary); margin-bottom: var(--s-4); font-weight: 600; }
.footer-col ul { list-style: none; padding: 0; display: grid; gap: var(--s-3); }
.footer-col a { color: var(--text); text-decoration: none; font-size: 0.9375rem; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  margin-top: var(--s-12); padding-top: var(--s-6); border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: var(--s-3) var(--s-6); align-items: center;
  color: var(--text-secondary); font-size: var(--step-small);
}
.footer-bottom .priv-line { margin-left: auto; }

/* ---- Legal pages: prose + sticky TOC ------------------------------------- */
.legal { padding-block: var(--s-16) var(--section-pad); }
.legal__layout { display: grid; gap: var(--s-12); grid-template-columns: 1fr; }
@media (min-width: 940px) { .legal__layout { grid-template-columns: 220px minmax(0, var(--prose)); justify-content: center; gap: var(--s-16); } }
.legal__header { margin-bottom: var(--s-12); }
.legal__header h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
.legal__meta { margin-top: var(--s-4); color: var(--text-secondary); font-size: var(--step-small); display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-6); }
.toc { position: sticky; top: 5rem; align-self: start; font-size: var(--step-small); }
@media (max-width: 939px) { .toc { position: static; border: 1px solid var(--border); border-radius: var(--radius-card); padding: var(--s-6); } }
.toc h2 { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-secondary); margin-bottom: var(--s-4); }
.toc ol { list-style: none; padding: 0; display: grid; gap: var(--s-2); counter-reset: toc; }
.toc a { color: var(--text-secondary); text-decoration: none; }
.toc a:hover { color: var(--accent); }
.prose { max-width: var(--prose); }
.prose h2 { font-size: 1.5rem; margin-top: var(--s-12); margin-bottom: var(--s-4); scroll-margin-top: 5rem; }
.prose h3 { font-size: 1.15rem; margin-top: var(--s-8); margin-bottom: var(--s-3); }
.prose p, .prose li { color: var(--text); }
.prose p + p { margin-top: var(--s-4); }
.prose ul, .prose ol { margin-top: var(--s-4); padding-left: 1.5rem; display: grid; gap: var(--s-2); }
.prose a { color: var(--accent); }
.draft-banner {
  background: color-mix(in srgb, var(--accent) 14%, var(--bg));
  border: 1px solid var(--accent); border-radius: var(--radius-card);
  padding: var(--s-4) var(--s-6); margin-bottom: var(--s-12); font-size: var(--step-small);
}
.draft-banner strong { color: var(--text); }
/* Conspicuous all-caps legal blocks: kept verbatim, loosened for legibility. */
.prose .legal-caps { letter-spacing: 0.015em; line-height: 1.75; }

/* ---- Download page ------------------------------------------------------- */
.os-cards { display: grid; gap: var(--s-6); grid-template-columns: 1fr; }
@media (min-width: 760px) { .os-cards { grid-template-columns: 1fr 1fr; } }
.os-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-card); padding: var(--s-8); }
.os-card header { display: flex; align-items: center; gap: var(--s-3); margin-bottom: var(--s-6); }
.os-card header svg { width: 26px; height: 26px; color: var(--accent); }
.os-card h3 { font-size: 1.125rem; }
.arch { display: grid; gap: var(--s-2); }
.arch a { display: flex; justify-content: space-between; gap: var(--s-4); align-items: baseline;
  padding: var(--s-3) var(--s-4); border: 1px solid var(--border); border-radius: var(--radius-control);
  text-decoration: none; color: var(--text); background: var(--surface-raised); }
.arch a:hover { border-color: var(--accent); }
.arch .arch__name { font-weight: 600; }
.arch .arch__size { color: var(--text-secondary); font-size: var(--step-small); font-family: var(--font-mono); }

.verify { margin-top: var(--s-12); }
.code {
  background: var(--surface-raised); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: var(--s-6);
  overflow-x: auto; font-family: var(--font-mono); font-size: 0.9375rem;
  line-height: 1.6; color: var(--text);
}
.code .c { color: var(--text-secondary); } /* comment */
.kv { display: grid; gap: var(--s-1); }

/* ---- 404 ----------------------------------------------------------------- */
.error-page { min-height: 62vh; display: grid; place-content: center; text-align: center; gap: var(--s-4); padding-block: var(--section-pad); }
.error-page img { width: 72px; height: 72px; margin: 0 auto var(--s-4); }
.error-page .btn { margin-top: var(--s-4); }

/* ---- Hero illustration (brand art, not a fake screenshot) ---------------- */
.hero__art {
  border: 1px solid var(--border); border-radius: var(--radius-card);
  overflow: hidden; box-shadow: var(--shadow); background: var(--surface-raised);
  aspect-ratio: 5 / 4;
}
.hero__art svg { width: 100%; height: 100%; }

/* ---- Promises: editorial columns, not boxed cards ----------------------- */
.promises { display: grid; gap: var(--s-12); }
@media (min-width: 820px) { .promises { grid-template-columns: 1fr 1fr; gap: var(--s-16); } }
.promise { border-top: 2px solid var(--gold); padding-top: var(--s-6); }
.promise__num { font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; color: var(--gold); line-height: 1; }
.promise h3 { font-family: var(--font-display); font-size: clamp(1.4rem, 2.4vw, 1.75rem); margin: var(--s-3) 0 var(--s-4); }
.promise > p { color: var(--text-secondary); }

/* ---- Motion -------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}