/* House of Cairn: the studio site.
   Layout: an editorial left-aligned page. The hero is the cairn, a stack of app-icon-shaped stones
   (Apple's continuous-corner squircle at the base, Material's cookie, pill and clover above),
   lit like glass. Below it, the apps on the trail, how we build, and the contact. */

:root {
  /* Colour: granite and lichen. Neutrals lean slightly green-blue, toward the accent. */
  --bg: #eef1ef;           /* pale granite */
  --surface: #f8faf9;      /* lit stone face */
  --surface-glass: rgb(255 255 255 / 0.58);
  --line: #cfd8d4;
  --fg: #18201d;           /* slate */
  --fg-soft: #4a5752;
  --accent: #1d6f5c;       /* lichen: the one bold colour */
  --accent-ink: #ffffff;
  --accent-soft: #d4ebe3;
  --stone-1: #3d4b52;      /* basalt */
  --stone-2: #1d6f5c;      /* lichen */
  --stone-3: #c39a72;      /* sandstone */
  --stone-4: #6d86a3;      /* slate blue */
  --stone-5: #e0d6c8;      /* quartz */
  --sheen: rgb(255 255 255 / 0.55);
  --shadow: rgb(24 32 29 / 0.16);

  /* Type: a chunky geometric display (wordmark and headings only), a humanist sans for reading,
     a mono for platform labels. */
  --font-display: "Unbounded", "Avenir Next", "Futura", system-ui, sans-serif;
  --font-body: "Instrument Sans", -apple-system, "Segoe UI", Roboto, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --step--1: clamp(0.82rem, 0.79rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.1rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.5vw, 1.45rem);
  --step-2: clamp(1.5rem, 1.3rem + 1vw, 2.1rem);
  --step-3: clamp(2.1rem, 1.6rem + 2.6vw, 3.6rem);

  /* Shape: Apple's continuous corners for surfaces; Material's full round for chips and buttons. */
  --radius-card: 28px;
  --radius-pill: 999px;
  --measure: 62ch;
}

/* Light only (owner, 2026-11-01): everyone sees the approved granite palette, whatever their device's setting. */
:root { color-scheme: light; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 var(--step-0)/1.6 var(--font-body);
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.wrap { max-width: 1120px; margin-inline: auto; }
a { color: var(--accent); text-underline-offset: 0.2em; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.1; text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; max-width: var(--measure); }
.label { font: 500 var(--step--1)/1.4 var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--fg-soft); }

/* Header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 20px; }
.wordmark { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); font: 700 1.05rem/1 var(--font-display); }
.wordmark svg { width: 34px; height: 34px; }
.top nav { display: flex; gap: 6px; flex-wrap: wrap; }
.top nav a {
  color: var(--fg); text-decoration: none; font-weight: 600; font-size: var(--step--1);
  padding: 8px 14px; border-radius: var(--radius-pill);
}
.top nav a:hover { background: var(--accent-soft); }

/* Hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: clamp(24px, 4vw, 56px); align-items: center; padding-block: clamp(24px, 6vw, 72px) clamp(32px, 6vw, 80px); }
.hero-copy { display: grid; gap: 22px; min-width: 0; }
.hero h1 { font-size: var(--step-3); }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lede { font-size: var(--step-1); color: var(--fg-soft); line-height: 1.5; }
.platforms { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: 500 var(--step--1)/1 var(--font-mono); padding: 9px 13px; border-radius: var(--radius-pill);
  background: var(--surface); border: 1px solid var(--line); color: var(--fg);
}
.cairn-stage { position: relative; display: grid; place-items: center; min-width: 0; }
.cairn-stage::before {
  content: ""; position: absolute; inset: 8% 6% 4%; border-radius: 40% 40% 32px 32px;
  background: radial-gradient(60% 55% at 50% 60%, var(--accent-soft), transparent 70%);
}
#cairn { position: relative; width: min(100%, 440px); height: auto; overflow: visible; }
#cairn .stone { cursor: pointer; transform-box: fill-box; transform-origin: 50% 100%; }
#cairn .stone:focus-visible { outline: none; }
#cairn .stone:focus-visible .face { stroke: var(--accent); stroke-width: 4; }
.cairn-note { margin-top: 6px; font-size: var(--step--1); color: var(--fg-soft); text-align: center; }

@keyframes settle {
  0% { transform: translateY(-46px) rotate(var(--tilt-from, 0deg)); }
  62% { transform: translateY(4px) rotate(var(--tilt, 0deg)); }
  82% { transform: translateY(-2px) rotate(var(--tilt, 0deg)); }
  100% { transform: translateY(0) rotate(var(--tilt, 0deg)); }
}
@keyframes wobble {
  0%, 100% { transform: rotate(var(--tilt, 0deg)); }
  25% { transform: rotate(calc(var(--tilt, 0deg) - 5deg)); }
  60% { transform: rotate(calc(var(--tilt, 0deg) + 4deg)); }
}
#cairn .stone { transform: rotate(var(--tilt, 0deg)); animation: settle 0.9s cubic-bezier(.2,.9,.25,1) both; }
#cairn .stone.wobble { animation: wobble 0.6s ease-in-out; }

/* Sections */
section { padding-block: clamp(36px, 6vw, 72px); border-top: 1px solid var(--line); }
.section-head { display: grid; gap: 10px; margin-bottom: clamp(20px, 3vw, 32px); }
.section-head h2 { font-size: var(--step-2); }

/* Apps: each app is a stone on the trail; its tile uses the shape of its stone. */
.apps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 20px; }
.app {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 18px; align-items: start;
  padding: 24px; border-radius: var(--radius-card);
  background: var(--surface-glass); border: 1px solid var(--line);
  backdrop-filter: blur(18px) saturate(1.4); -webkit-backdrop-filter: blur(18px) saturate(1.4);
}
.app-icon { width: 64px; height: 64px; }
.app-body { display: grid; gap: 8px; min-width: 0; }
.app h3 { font-size: var(--step-1); }
.status { justify-self: start; font: 500 0.75rem/1 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; padding: 7px 10px; border-radius: var(--radius-pill); background: var(--accent-soft); color: var(--fg); }

/* How we build */
.ways { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 28px; }
.way { display: grid; gap: 10px; align-content: start; }
.way svg { width: 76px; height: 56px; }
.way h3 { font-size: var(--step-1); }
.way p { color: var(--fg-soft); }
.fold-demo .leaf-r { transform-box: fill-box; transform-origin: 0% 50%; transition: transform 0.6s cubic-bezier(.2,.9,.25,1); }
.way:hover .fold-demo .leaf-r, .way:focus-within .fold-demo .leaf-r { transform: scaleX(0.12); }

/* The trail story */
.story { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 48px); align-items: start; }
.story blockquote { margin: 0; padding: 28px; border-radius: var(--radius-card); background: var(--surface); border: 1px solid var(--line); display: grid; gap: 10px; }
.story blockquote p { font: 500 var(--step-1)/1.35 var(--font-display); }
.story blockquote footer { color: var(--fg-soft); font-size: var(--step--1); }
.story .text { display: grid; gap: 14px; color: var(--fg-soft); }

/* Contact and footer */
.contact { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; }
.address { font: 500 var(--step-1)/1 var(--font-mono); color: var(--fg); user-select: all; }
.button {
  font: 600 var(--step--1)/1 var(--font-body); border: 0; cursor: pointer;
  padding: 12px 18px; border-radius: var(--radius-pill); background: var(--accent); color: var(--accent-ink);
}
.button[data-done] { background: var(--accent-soft); color: var(--fg); }
.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-block: 28px 36px; border-top: 1px solid var(--line); color: var(--fg-soft); font-size: var(--step--1); }
.foot nav { display: flex; gap: 16px; }
.foot a { color: var(--fg-soft); }

/* Plain pages (privacy, support) */
.doc { display: grid; gap: 18px; padding-block: clamp(24px, 5vw, 56px); max-width: 72ch; }
.doc h1 { font-size: var(--step-2); }
.doc h2 { font-size: var(--step-1); margin-top: 14px; }
.doc ul { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }
.doc .updated { color: var(--fg-soft); font-size: var(--step--1); }

.wordmark { white-space: nowrap; }
@media (max-width: 560px) {
  .top { flex-wrap: wrap; gap: 8px; }
  .top nav { gap: 0; margin-left: -10px; }
  .top nav a { padding: 8px 10px; }
}

@media (max-width: 760px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .cairn-stage { order: -1; }
  #cairn { width: min(78%, 340px); }
  .story { grid-template-columns: minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  #cairn .stone, #cairn .stone.wobble { animation: none; }
  .fold-demo .leaf-r { transition: none; }
}