/* Studio tools and lab pages: the marketing site's world (landing.css), in its
   working register. Warm off-white ground, ink type, Inter Tight + Chiron Hei HK,
   burnt-orange accent, gradient pill for the one primary action. */
:root {
  --bg: #F7F4EF;
  --panel: #FFFFFF;
  --panel-2: #F2EEE7;
  --ink: #101012;
  --plum: #101012;       /* legacy name: headings */
  --plum-deep: #101012;  /* legacy name: dark wells */
  --muted: #6B6760;
  --line: #E7E1D8;
  --white: #FFFFFF;
  --warm: #FBF1E7;
  --warm-line: #F1DCC6;
  --brand: #C2410C;
  --brand-deep: #A8380F;
  --brand-soft: rgba(194, 65, 12, 0.12);
  --peach: #FFB27A;
  --grad: linear-gradient(95deg, #BE185D 0%, #C2410C 100%);
  --radius: 20px;
  --maxw: 1180px;
  --disp: 'Inter Tight', 'Chiron Hei HK', 'PingFang HK', 'Noto Sans TC', sans-serif;
  --body: 'Inter', 'PingFang HK', 'Noto Sans TC', -apple-system, system-ui, sans-serif;
  --cjk: 'Chiron Hei HK', 'PingFang HK', 'Noto Sans TC', sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { overflow-x: clip; }

body {
  margin: 0;
  font: 16px/1.6 var(--body);
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}
::selection { background: rgba(194, 65, 12, 0.18); color: var(--ink); }
body { caret-color: var(--brand); accent-color: var(--brand); }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }

a { color: var(--brand-deep); text-underline-offset: 3px; }

/* nav: the marketing site's sticky bar (landing .lnav) */
nav.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: env(safe-area-inset-top, 0px);
  background: rgba(247, 244, 239, 0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid rgba(16, 16, 18, 0.07);
}
.nav-inner { max-width: 1240px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 26px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { height: 26px; width: auto; display: block; flex-shrink: 0; }
.brand .sub { font: 600 1rem var(--disp); color: var(--ink); padding-left: 10px; border-left: 1px solid var(--line); line-height: 1.2; }
.tabs { display: flex; gap: 6px; margin-left: auto; }
.tabs a {
  font: 500 0.93rem var(--disp);
  color: var(--ink);
  opacity: 0.66;
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 100px;
  white-space: nowrap;
  transition: opacity .15s ease, background .15s ease;
}
.tabs a:hover { opacity: 1; }
.tabs a.active { opacity: 1; background: var(--ink); color: #fff; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px 80px; }

h1, h2, h3 { font-family: var(--disp); font-weight: 600; line-height: 1.15; letter-spacing: -0.02em; margin: 0; color: var(--ink); }
h1 { font-size: clamp(2.3rem, 5.5vw, 3.6rem); letter-spacing: -0.03em; margin-bottom: 14px; text-wrap: balance; }
h2 { font-size: 1.35rem; margin-bottom: 12px; }

.eyebrow {
  display: inline-block;
  font: 500 0.82rem var(--disp);
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 6px 14px;
  margin-bottom: 18px;
}

.lede { color: #3D3A36; font-size: 1.06rem; max-width: 660px; margin: 0; }

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-top: 22px;
}

.dark {
  background: #101012;
  color: #fff;
  border-radius: var(--radius);
  padding: 28px;
  margin-top: 22px;
}
.label {
  display: block;
  font: 600 0.76rem var(--disp);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand-deep);
  margin-bottom: 10px;
}
.dark .label { color: var(--peach); }

.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

/* buttons: outline pill, black "on", gradient primary (the marketing site's pills) */
button, .btn {
  font: 500 0.9rem var(--disp);
  color: var(--ink);
  background: var(--white);
  border: 1px solid rgba(16, 16, 18, 0.18);
  border-radius: 100px;
  padding: 7px 16px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
button:hover, .btn:hover { border-color: var(--ink); }
button.primary, .btn.primary { background: var(--grad); border-color: transparent; color: #fff; padding: 8px 20px; box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.32); }
button.primary:hover, .btn.primary:hover { transform: translateY(-1px); border-color: transparent; }
button.on { background: var(--ink); border-color: var(--ink); color: #fff; }
button:disabled { opacity: 0.4; cursor: default; transform: none; }

@media (max-width: 640px) {
  .nav-inner { gap: 12px; padding: 10px 16px; }
  .brand img { height: 22px; }
  .brand .sub { font-size: 0.92rem; padding-left: 8px; }
  .tabs { gap: 2px; }
  .tabs a { padding: 6px 9px; font-size: 0.82rem; }
  .wrap { padding: 0 16px 60px; }
  .card, .dark { padding: 20px 18px; }
}
@media (max-width: 400px) {
  .brand .sub { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  button, .btn, .tabs a { transition: none; }
}