/* Trailbaker — shared tokens, layout and components. */

:root {
  color-scheme: light dark;

  --dirt-900: #2a2118;
  --dirt-700: #4a3826;
  --dirt-500: #8b5e3c;
  --clay-500: #d97a34;
  --clay-600: #bd6224;
  --moss-600: #2e5e3a;
  --moss-400: #4f8b5c;

  --bg:        #f7f3ea;
  --bg-raised: #ffffff;
  --bg-sunken: #efe8db;
  --ink:       #2a2521;
  --ink-soft:  #61574c;
  --ink-faint: #8b8175;
  --rule:      #ddd2bf;
  --accent:    var(--clay-500);
  --accent-ink:#ffffff;

  --green: #2e9e4f;
  --blue:  #2b6cb0;
  --black: #22272e;
  --dblack:#7b1d1d;
  --warn:  #c9761f;
  --bad:   #c0392b;

  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgba(42,33,24,.07), 0 6px 20px rgba(42,33,24,.07);
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --measure: 68ch;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #17140f;
    --bg-raised: #211c16;
    --bg-sunken: #100e0a;
    --ink:       #f0e8dc;
    --ink-soft:  #b8ac9c;
    --ink-faint: #8a7f70;
    --rule:      #3a3128;
    --accent:    #e88b45;
    --accent-ink:#241a12;
    --green: #4cc06d; --blue: #5b9ae0; --black: #cdd3dc; --dblack: #e0736c;
    --warn: #e8a33d; --bad: #e8695c;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"] {
  --bg:        #17140f;
  --bg-raised: #211c16;
  --bg-sunken: #100e0a;
  --ink:       #f0e8dc;
  --ink-soft:  #b8ac9c;
  --ink-faint: #8a7f70;
  --rule:      #3a3128;
  --accent:    #e88b45;
  --accent-ink:#241a12;
  --green: #4cc06d; --blue: #5b9ae0; --black: #cdd3dc; --dblack: #e0736c;
  --warn: #e8a33d; --bad: #e8695c;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.35);
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, h4 { line-height: 1.18; margin: 0 0 .5em; font-weight: 700; letter-spacing: -.015em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1em; }
a  { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--clay-600); }
img, svg, canvas { max-width: 100%; }
code { font-family: var(--mono); font-size: .92em; background: var(--bg-sunken);
       padding: .1em .35em; border-radius: 4px; }

.wrap { width: min(1120px, 100% - 2.5rem); margin-inline: auto; }
.prose { max-width: var(--measure); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* --- contour motif, used behind hero sections --- */
.contours {
  position: absolute; inset: 0; pointer-events: none;
  opacity: .5; z-index: 0;
}

/* --- site header --- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-head .wrap { display: flex; align-items: center; gap: 1rem; height: 60px; }
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 800; letter-spacing: -.02em; font-size: 1.08rem;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand:hover { color: var(--ink); }
.brand-mark { width: 26px; height: 26px; flex: none; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: .25rem; }
.site-nav a {
  color: var(--ink-soft); text-decoration: none; font-weight: 600; font-size: .93rem;
  padding: .45rem .7rem; border-radius: 8px;
}
.site-nav a:hover { color: var(--ink); background: var(--bg-sunken); }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--bg-sunken); }

/* --- buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  font: inherit; font-weight: 650; font-size: .92rem;
  padding: .58rem 1rem; border-radius: var(--radius);
  border: 1px solid var(--rule); background: var(--bg-raised); color: var(--ink);
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background .12s, border-color .12s, transform .06s;
}
.btn:hover { background: var(--bg-sunken); color: var(--ink); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary {
  background: var(--accent); border-color: transparent; color: var(--accent-ink);
}
.btn-primary:hover { background: var(--clay-600); color: var(--accent-ink); }
.btn-lg { font-size: 1rem; padding: .8rem 1.4rem; }
.btn[aria-pressed="true"] {
  background: var(--accent); border-color: transparent; color: var(--accent-ink);
}
:where(.btn, a, button, input, select, summary):focus-visible {
  outline: 2.5px solid var(--accent); outline-offset: 2px; border-radius: var(--radius);
}

/* --- difficulty badges --- */
.badge {
  display: inline-flex; align-items: center; gap: .4rem;
  font-weight: 700; font-size: .8rem; letter-spacing: .02em;
  padding: .22rem .6rem; border-radius: 999px;
  background: var(--bg-sunken); color: var(--ink-soft);
}
.badge::before { content: ""; width: .62em; height: .62em; background: currentColor; }
.badge-green  { color: var(--green); }
.badge-green::before  { border-radius: 50%; }
.badge-blue   { color: var(--blue); }
.badge-black  { color: var(--black); transform: none; }
.badge-black::before  { rotate: 45deg; }
.badge-dblack { color: var(--dblack); }
.badge-dblack::before { rotate: 45deg; }

/* --- cards --- */
.card {
  background: var(--bg-raised); border: 1px solid var(--rule);
  border-radius: var(--radius-lg); padding: 1.25rem;
}
.card h3 { margin-top: 0; }
.grid { display: grid; gap: 1rem; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* --- callouts --- */
.note {
  border-left: 3px solid var(--accent); background: var(--bg-sunken);
  padding: .85rem 1rem; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.25rem 0;
}
.note strong { color: var(--ink); }
.note p:last-child { margin-bottom: 0; }

/* --- footer --- */
.site-foot {
  margin-top: 4rem; border-top: 1px solid var(--rule);
  padding: 2rem 0 3rem; color: var(--ink-faint); font-size: .88rem;
}
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: baseline; }
.site-foot a { color: var(--ink-soft); }

@media (max-width: 640px) {
  .site-head .wrap { gap: .5rem; }
  .site-nav a { padding: .4rem .5rem; font-size: .88rem; }
}

/* --- home hero --- */

.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--rule); }
.hero .wrap {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1.08fr; gap: 3rem; align-items: center;
  padding: 3.5rem 0 4rem;
}
.hero h1 { margin-bottom: .5rem; }
.hero .lede { font-size: 1.14rem; color: var(--ink-soft); max-width: 46ch; margin-bottom: 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .7rem; }

.hero-demo {
  position: relative; aspect-ratio: 4 / 3; border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid var(--rule); box-shadow: var(--shadow);
  background: var(--bg-sunken);
}
.hero-demo canvas, .hero-demo svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-demo figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 1.4rem .9rem .6rem; font-size: .78rem; color: #f4ece0;
  background: linear-gradient(transparent, rgba(20,15,10,.78));
}

.eyebrow {
  display: inline-block; font-size: .76rem; font-weight: 700;
  letter-spacing: .09em; text-transform: uppercase; color: var(--accent);
  margin-bottom: .7rem;
}

.section { padding: 3.5rem 0; }
.section-head { max-width: var(--measure); margin-bottom: 1.8rem; }

.steps { counter-reset: step; display: grid; gap: 1rem; }
.steps > li { list-style: none; position: relative; padding-left: 3rem; }
.steps > li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: -.1rem;
  width: 2rem; height: 2rem; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: .9rem;
}
.steps-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem 2.5rem; }
.steps h3 { margin-bottom: .2rem; font-size: 1rem; }
.steps p { margin: 0; color: var(--ink-soft); font-size: .92rem; }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 2rem; padding: 2.5rem 0 3rem; }
  .hero-demo { order: -1; }
  .steps-grid { grid-template-columns: 1fr; }
}

/* --- learn page --- */

.learn-layout {
  display: grid; grid-template-columns: 210px minmax(0, 1fr);
  gap: 3rem; padding: 2.5rem 0 1rem; align-items: start;
}
.learn-toc { position: sticky; top: 76px; font-size: .88rem; }
.learn-toc h2 {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-faint); margin-bottom: .6rem;
}
.learn-toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: .1rem; }
.learn-toc a {
  display: block; padding: .3rem .5rem; border-radius: 6px;
  color: var(--ink-soft); text-decoration: none; border-left: 2px solid transparent;
}
.learn-toc a:hover { background: var(--bg-sunken); color: var(--ink); }
.learn-toc a.is-current { color: var(--ink); border-left-color: var(--accent); font-weight: 600; }

.lesson { scroll-margin-top: 76px; padding-bottom: 2.6rem; }
.lesson + .lesson { border-top: 1px solid var(--rule); padding-top: 2.6rem; }
.lesson > * { max-width: var(--measure); }
.lesson figure { margin: 1.4rem 0; max-width: 100%; }
.lesson figure svg {
  width: 100%; height: auto; display: block;
  background: var(--bg-raised); border: 1px solid var(--rule); border-radius: var(--radius);
}
.lesson figcaption { font-size: .84rem; color: var(--ink-faint); margin-top: .5rem; }
.lesson ul { padding-left: 1.15rem; }
.lesson li { margin-bottom: .4rem; }

.diagram-label { font: 600 11px var(--font); fill: var(--ink-soft); }
.diagram-strong { font: 700 12px var(--font); fill: var(--ink); }

.glossary { display: grid; gap: .1rem; margin: 0; max-width: var(--measure); }
.glossary > div { padding: .6rem 0; border-bottom: 1px dotted var(--rule); }
.glossary dt { font-weight: 700; font-size: .93rem; }
.glossary dd { margin: .15rem 0 0; color: var(--ink-soft); font-size: .9rem; }

@media (max-width: 860px) {
  .learn-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .learn-toc { position: static; border-bottom: 1px solid var(--rule); padding-bottom: 1rem; }
  .learn-toc ol { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); display: grid; }
}

/* --- small shared pieces ---
   These exist so no page needs a style attribute: the Content-Security-Policy
   the site ships with disallows inline styles outright. */

.lede { font-size: 1.12rem; color: var(--ink-soft); max-width: var(--measure); }
.statement { font-size: 1.05rem; }
.muted { color: var(--ink-soft); }
.section--tight { padding-top: 0; }
.cta-row { margin-top: 1.8rem; }
.push { margin-left: auto; }

.stack { display: grid; gap: .6rem; }
.stack > * { margin: 0; }

.small-print { font-size: .86rem; color: var(--ink-soft); margin: 0; }
.small-print + .small-print { margin-top: .6rem; }

.swatch--fall  { background: var(--bad); }
.swatch--half  { background: var(--warn); }
.swatch--steep { background: #8b5cf6; }
.swatch--water { background: #3aa0d8; }