/* img2cad site — Liquid Glass, matching the local viewer (scripts/viewer.html). */
:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Segoe UI", "Noto Sans TC", "PingFang TC", system-ui, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --ink: #1c1c1e; --ink-2: rgba(60, 60, 67, .74); --ink-3: rgba(60, 60, 67, .5);
  --accent: #0a84ff; --accent-ink: #fff; --accent-soft: rgba(10, 132, 255, .14);
  --good: #248a3d; --bad: #d70015;
  --bg: #eef2f8;
  --blob-1: rgba(120, 170, 255, .55); --blob-2: rgba(255, 180, 140, .45); --blob-3: rgba(170, 230, 210, .45);
  --glass-tint: rgba(255, 255, 255, .42); --glass-tint-2: rgba(255, 255, 255, .18);
  --glass-rim: rgba(255, 255, 255, .85); --glass-rim-2: rgba(255, 255, 255, .22);
  --glass-shadow: 0 20px 50px rgba(30, 40, 70, .14), 0 2px 8px rgba(30, 40, 70, .06);
  --glass-blur: blur(28px) saturate(190%);
  --field: rgba(118, 118, 128, .12); --field-hover: rgba(118, 118, 128, .2);
  --separator: rgba(60, 60, 67, .14);
  --code-bg: rgba(28, 28, 32, .82); --code-text: #f2f2f7;
  --stage: rgba(255, 255, 255, .35);
  --radius: 26px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f5f5f7; --ink-2: rgba(235, 235, 245, .72); --ink-3: rgba(235, 235, 245, .45);
    --accent-soft: rgba(10, 132, 255, .26); --good: #30d158; --bad: #ff453a;
    --bg: #0b0e14;
    --blob-1: rgba(40, 90, 200, .45); --blob-2: rgba(150, 60, 120, .32); --blob-3: rgba(20, 120, 110, .3);
    --glass-tint: rgba(50, 52, 64, .48); --glass-tint-2: rgba(28, 30, 40, .26);
    --glass-rim: rgba(255, 255, 255, .3); --glass-rim-2: rgba(255, 255, 255, .06);
    --glass-shadow: 0 20px 50px rgba(0, 0, 0, .5), 0 2px 8px rgba(0, 0, 0, .3);
    --glass-blur: blur(28px) saturate(170%) brightness(.92);
    --field: rgba(118, 118, 128, .24); --field-hover: rgba(118, 118, 128, .34);
    --separator: rgba(235, 235, 245, .12);
    --stage: rgba(255, 255, 255, .06);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
main section[id] { scroll-margin-top: 88px; }
body {
  margin: 0; position: relative; overflow-x: hidden;
  font: 16px/1.6 var(--font); color: var(--ink); background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
/* coloured light behind the glass, so the panels have something to refract */
body::before {
  content: ""; position: fixed; inset: -20vmax; z-index: -1; pointer-events: none;
  background:
    radial-gradient(38vmax 30vmax at 12% 10%, var(--blob-1), transparent 70%),
    radial-gradient(34vmax 28vmax at 90% 30%, var(--blob-2), transparent 70%),
    radial-gradient(40vmax 30vmax at 40% 95%, var(--blob-3), transparent 70%);
  filter: blur(30px);
  animation: drift 40s ease-in-out infinite alternate;
}
@keyframes drift { to { transform: translate3d(3vmax, -2vmax, 0) rotate(8deg); } }
@media (prefers-reduced-motion: reduce) { body::before { animation: none; } html { scroll-behavior: auto; } }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: .86em; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 600; letter-spacing: -.01em; }

/* ---------- Liquid glass surface ---------- */
.top, .hero-stage, .steps li, .example, .card, .registered, .tabs, .tab-panels pre, .links li, footer,
.split > div:first-child {
  position: relative; isolation: isolate;
  background: linear-gradient(160deg, var(--glass-tint), var(--glass-tint-2));
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow), inset 0 1px 0 0 var(--glass-rim), inset 0 -1px 0 0 var(--glass-rim-2), inset 0 0 0 .5px rgba(255, 255, 255, .25);
  border-radius: var(--radius);
}
/* specular sheen */
.top::before, .hero-stage::before, .steps li::before, .example::before, .card::before, .registered::before, .links li::before,
.split > div:first-child::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; z-index: -1;
  background: radial-gradient(120% 60% at 20% -10%, rgba(255, 255, 255, .6), transparent 55%),
              radial-gradient(80% 50% at 110% 120%, rgba(255, 255, 255, .18), transparent 60%);
  mix-blend-mode: soft-light;
}
/* refracting rim */
.top::after, .hero-stage::after, .steps li::after, .example::after, .card::after, .registered::after, .links li::after,
.split > div:first-child::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; padding: 1px;
  background: linear-gradient(150deg, rgba(255, 255, 255, .9), rgba(255, 255, 255, .08) 35%, rgba(255, 255, 255, .02) 60%, rgba(255, 255, 255, .5));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: .75;
}
@media (prefers-color-scheme: dark) {
  .top::after, .hero-stage::after, .steps li::after, .example::after, .card::after, .registered::after, .links li::after, .split > div:first-child::after { opacity: .35; }
  .top::before, .hero-stage::before, .steps li::before, .example::before, .card::before, .registered::before, .links li::before, .split > div:first-child::before { opacity: .45; }
}
@media (prefers-reduced-transparency: reduce) {
  .top, .hero-stage, .steps li, .example, .card, .registered, .tabs, .links li, footer, .split > div:first-child { backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--bg); }
}

/* ---------- Floating header ---------- */
.top {
  position: sticky; top: 12px; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  width: min(1160px, calc(100% - 24px)); margin: 12px auto 0; padding: 8px 10px 8px 18px; border-radius: 999px;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; color: var(--ink); font-size: 1.05rem; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand svg { width: 24px; height: 24px; fill: var(--accent); }
.brand .cut { stroke: rgba(255, 255, 255, .9); stroke-width: 2; fill: none; }
nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
nav a { color: var(--ink-2); font-size: .92rem; font-weight: 500; padding: 7px 12px; border-radius: 999px; transition: background .2s, color .2s; }
nav a:hover { background: var(--field); color: var(--ink); text-decoration: none; }
#lang { border: 0; background: var(--field); color: var(--ink); border-radius: 999px; padding: 7px 14px; cursor: pointer; font: 600 .85rem var(--font); margin-left: 4px; transition: background .2s; }
#lang:hover { background: var(--field-hover); }

/* ---------- Sections ---------- */
main section { padding: 76px max(16px, calc((100vw - 1160px) / 2)); }
.band { background: transparent; }
.section-lede { color: var(--ink-2); max-width: 70ch; margin: 0 0 32px; font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 48px; align-items: center; padding-top: 64px; }
.hero-text, .hero-stage { min-width: 0; }
.eyebrow { display: inline-block; color: var(--accent); background: var(--accent-soft); font-weight: 600; font-size: .85rem; margin: 0 0 16px; padding: 5px 12px; border-radius: 999px; }
.hero h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); font-weight: 800; letter-spacing: -.035em; }
.lede { font-size: 1.12rem; color: var(--ink-2); max-width: 56ch; }
.cta { display: flex; gap: 12px; margin: 28px 0; flex-wrap: wrap; }
.button {
  display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600; color: var(--ink);
  background: linear-gradient(160deg, var(--glass-tint), var(--glass-tint-2)); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow), inset 0 1px 0 var(--glass-rim); transition: transform .15s, filter .2s;
}
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button:active { transform: scale(.97); }
.button.primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 10px 26px rgba(10, 132, 255, .38), inset 0 1px 0 rgba(255, 255, 255, .4); }
.button.primary:hover { filter: brightness(1.08); }
.facts { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; color: var(--ink-2); }
.facts b { color: var(--ink); font-family: var(--mono); font-size: .84rem; margin-right: 8px; background: var(--field); padding: 2px 8px; border-radius: 7px; }

.hero-stage { margin: 0; padding: 18px; }
.pair { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1.3fr); align-items: center; gap: 12px; }
.pair img { border-radius: 18px; box-shadow: 0 8px 22px rgba(0, 0, 0, .12); }
.arrow { font-size: 1.6rem; color: var(--accent); }
.hero-stage figcaption { color: var(--ink-2); font-size: .9rem; margin: 14px 4px 2px; }
.viewer { position: relative; aspect-ratio: 4 / 3; border-radius: 18px; background: var(--stage); box-shadow: inset 0 0 0 .5px rgba(255, 255, 255, .4), inset 0 1px 0 rgba(255, 255, 255, .5); overflow: hidden; touch-action: none; }
.viewer canvas { display: block; width: 100% !important; height: 100% !important; cursor: grab; }
.viewer canvas:active { cursor: grabbing; }
.viewer .loading { position: absolute; inset: 0; display: grid; place-items: center; color: var(--ink-3); font-size: .85rem; }

/* ---------- Steps ---------- */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.steps li { padding: 22px; display: flex; flex-direction: column; border-radius: 22px; transition: transform .25s cubic-bezier(.2, .9, .25, 1.2); }
.steps li:hover { transform: translateY(-3px); }
.steps p { color: var(--ink-2); font-size: .93rem; margin: 0 0 14px; flex: 1; }
.steps li > code { align-self: flex-start; color: var(--accent); background: var(--accent-soft); padding: 3px 9px; border-radius: 8px; }
.onboarding .prompt { position: relative; margin: 0 0 14px; padding: 62px 16px 16px; border-radius: 14px; background: var(--code-bg); color: var(--code-text); font-size: .88rem; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; }
.onboarding .prompt code { font-size: inherit; }
.onboarding .step-link { flex: 0; margin-top: auto; margin-bottom: 0; }
.onboarding .step-link a { font-weight: 600; }
.n { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; font-size: .88rem; margin-bottom: 12px; box-shadow: 0 6px 14px rgba(10, 132, 255, .35), inset 0 1px 0 rgba(255, 255, 255, .4); }

/* ---------- Gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 22px; }
.example { overflow: hidden; display: flex; flex-direction: column; transition: transform .3s cubic-bezier(.2, .9, .25, 1.15); }
.example:hover { transform: translateY(-4px); }
.example .views { display: flex; gap: 2px; margin: 12px 12px 0; padding: 3px; background: var(--field); border-radius: 12px; flex-wrap: wrap; }
.example .views button { flex: 1; border: 0; background: none; color: var(--ink); padding: 6px 8px; border-radius: 9px; cursor: pointer; font: 500 .8rem var(--font); white-space: nowrap; transition: background .2s, box-shadow .2s; }
.example .views button[aria-pressed="true"] { background: rgba(255, 255, 255, .92); box-shadow: 0 3px 8px rgba(0, 0, 0, .12), 0 0 0 .5px rgba(0, 0, 0, .04); }
@media (prefers-color-scheme: dark) { .example .views button[aria-pressed="true"] { background: rgba(99, 99, 102, .9); } }
.example .media { position: relative; margin: 12px; border-radius: 18px; overflow: hidden; background: var(--stage); }
.example .media img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; background: #fff; }
.example .media .viewer { border-radius: 0; box-shadow: none; }
.example .body { padding: 4px 20px 22px; display: grid; gap: 10px; }
.example h3 { margin: 0; font-size: 1.18rem; }
.example .sub { color: var(--ink-2); font-size: .88rem; margin: -4px 0 0; }
.tag { display: inline-block; font-size: .74rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; background: var(--field); color: var(--ink-2); margin-right: 6px; }
.tag.dim { color: var(--accent); background: var(--accent-soft); }
.metrics { display: flex; gap: 6px 16px; flex-wrap: wrap; font-size: .85rem; color: var(--ink-2); }
.metrics b { color: var(--ink); font-variant-numeric: tabular-nums; }
.techniques { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: .86rem; }
.checks { font-size: .82rem; border-collapse: collapse; width: 100%; }
.checks td { padding: 5px 6px; border-top: .5px solid var(--separator); font-variant-numeric: tabular-nums; }
.ok { color: var(--good); font-weight: 700; }
.no { color: var(--bad); font-weight: 700; }
.revisions { font-size: .82rem; color: var(--ink-2); }
.example .more { font-size: .88rem; font-weight: 600; }

/* ---------- Precision ---------- */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.split > div:first-child { padding: 26px; }
.tools { list-style: none; padding: 0; display: grid; gap: 10px; }
.tools code { background: var(--field); padding: 3px 9px; border-radius: 8px; margin-right: 8px; color: var(--ink); }
.tools span { color: var(--ink-2); }
.note { color: var(--ink-2); font-size: .93rem; border-left: 3px solid var(--accent); padding-left: 12px; margin-bottom: 0; }
.registered { margin: 0; padding: 14px; }
.registered img { border-radius: 16px; }
.registered figcaption { margin: 12px 4px 2px; font-size: .88rem; color: var(--ink-2); }
.swatches { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 8px; }
.swatch { display: inline-flex; align-items: center; gap: 6px; font-variant-numeric: tabular-nums; }
.swatch i { width: 14px; height: 14px; border-radius: 4px; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .18), inset 0 1px 1px rgba(255, 255, 255, .4); display: inline-block; }

/* ---------- Output cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { padding: 22px; border-radius: 22px; transition: transform .25s cubic-bezier(.2, .9, .25, 1.2); }
.card:hover { transform: translateY(-3px); }
.card h3 { font-family: var(--mono); font-size: .98rem; }
.card p { color: var(--ink-2); font-size: .93rem; margin: 0 0 10px; }
.card code { color: var(--accent); background: var(--accent-soft); padding: 3px 9px; border-radius: 8px; }

/* ---------- Install: segmented tabs + glass code ---------- */
.tabs { display: inline-flex; gap: 2px; padding: 4px; margin-bottom: 14px; border-radius: 14px; flex-wrap: wrap; }
.tabs button { border: 0; background: none; color: var(--ink); padding: 8px 16px; border-radius: 10px; cursor: pointer; font: 500 .9rem var(--font); transition: background .2s, box-shadow .2s; }
.tabs button:hover { background: var(--field); }
.tabs button[aria-selected="true"] { background: rgba(255, 255, 255, .92); box-shadow: 0 3px 8px rgba(0, 0, 0, .12), 0 0 0 .5px rgba(0, 0, 0, .04); }
@media (prefers-color-scheme: dark) { .tabs button[aria-selected="true"] { background: rgba(99, 99, 102, .9); } }
.tab-panels pre { --glass-tint: rgba(24, 24, 30, .78); --glass-tint-2: rgba(24, 24, 30, .66); --glass-rim: rgba(255, 255, 255, .22); color: var(--code-text); padding: 64px 22px 20px; border-radius: 20px; overflow-x: auto; margin: 0 0 24px; font-size: .9rem; line-height: 1.6; }
pre code { font-size: inherit; }
.copy-button {
  position: absolute; top: 12px; right: 12px; min-height: 40px; min-width: 76px;
  border: 1px solid rgba(255, 255, 255, .3); border-radius: 10px;
  background: rgba(255, 255, 255, .14); color: #fff;
  padding: 7px 12px; font: 600 .82rem var(--font); line-height: 1.2;
  cursor: pointer; white-space: nowrap; transition: background .15s, border-color .15s;
}
.copy-button:hover { background: rgba(255, 255, 255, .24); }
.copy-button:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.copy-button[data-state="copied"] { border-color: #7ee2a0; color: #a7f0ba; }

/* ---------- Agent links ---------- */
.links { list-style: none; padding: 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.links li { padding: 16px 20px; border-radius: 18px; }
.links a { font-family: var(--mono); font-weight: 600; margin-right: 10px; }
.links span { color: var(--ink-2); }

footer {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  width: min(1160px, calc(100% - 24px)); margin: 24px auto 28px; padding: 16px 24px; border-radius: 999px;
  color: var(--ink-2); font-size: .85rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-top: 40px; }
  .hero-text { max-width: 760px; }
  .hero-stage { width: min(100%, 800px); }
  nav a:not([href="#get-started"]):not([href^="http"]) { display: none; }
}
@media (max-width: 960px) {
  .onboarding { grid-template-columns: minmax(0, 1fr); max-width: 760px; }
  .onboarding .prompt { font-size: .92rem; }
  .steps:not(.onboarding) { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .split { grid-template-columns: minmax(0, 1fr); }
  main section { padding-top: 52px; padding-bottom: 52px; }
  footer { border-radius: 24px; }
}
@media (max-width: 640px) {
  main section { padding-top: 44px; padding-bottom: 44px; }
  .hero { gap: 28px; }
  .hero h1 { font-size: clamp(2.15rem, 8.5vw, 3rem); }
  .lede { font-size: 1rem; }
  .steps:not(.onboarding) { grid-template-columns: minmax(0, 1fr); }
  .onboarding .prompt { font-size: .85rem; }
  .section-lede { font-size: 1rem; }
  nav a[href="https://github.com/YUI-TIEN/img2cad"] { display: none; }
  footer { padding: 18px; }
}
@media (max-width: 600px) {
  .pair { grid-template-columns: minmax(0, 1fr); }
  .arrow { transform: rotate(90deg); justify-self: center; }
}
@media (max-width: 420px) {
  .top { padding-left: 14px; }
  .cta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .cta .button { text-align: center; padding-inline: 10px; }
}
@media (max-width: 340px) {
  nav a[href="#get-started"] { display: none; }
}