/* base.css — reset, typography, layout primitives. Tokens only, no literals. */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: var(--fw-body);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}
body.is-locked { overflow: hidden; }

h1, h2, h3, h4 {
  margin: 0 0 var(--sp-4);
  font-family: var(--font-display);
  font-weight: var(--fw-display);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-display);
  color: var(--c-ink);
}
h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }
p { margin: 0 0 var(--sp-4); }
p:last-child { margin-bottom: 0; }

a { color: var(--c-accent-text); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--c-accent-hover); }

img, svg, video { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0 0 var(--sp-4); padding-left: 1.25em; }
li { margin-bottom: var(--sp-2); }
hr { border: 0; border-top: var(--border-w) solid var(--c-line); margin: var(--sp-6) 0; }
small { font-size: var(--fs-micro); }
strong, b { font-weight: var(--fw-bold); }

button, input, select, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 3px solid var(--c-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection { background: var(--c-accent); color: var(--c-accent-ink); }

.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: -100px;
  z-index: var(--z-modal);
  background: var(--c-accent);
  color: var(--c-accent-ink);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius);
  font-weight: var(--fw-bold);
}
.skip-link:focus { top: var(--sp-4); }

/* --- Layout ------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); }
.section--alt { background: var(--c-bg-alt); }

.section-head { margin-bottom: var(--sp-6); }
.section-head p { color: var(--c-ink-soft); max-width: 60ch; }

.eyebrow {
  display: inline-block;
  font-size: var(--fs-micro);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-caps);
  text-transform: uppercase;
  color: var(--c-gold-ink);
  margin-bottom: var(--sp-2);
}

.grid { display: grid; gap: var(--sp-5); }
.grid--cards { grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); }
.grid--mooncakes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 960px) {
  .grid--mooncakes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.grid--wide  { grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.grid--2     { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }

@media (max-width: 639px) {
  .grid { gap: var(--sp-3); }
  .grid--cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-2);
  }
}

.stack > * + * { margin-top: var(--sp-4); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--sp-3); align-items: center; }

.muted { color: var(--c-ink-soft); }
.faint { color: var(--c-ink-faint); font-size: var(--fs-micro); }
.center { text-align: center; }
.mt-6 { margin-top: var(--sp-6); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
}
[hidden] { display: none !important; }

/* Pages are generated once per language (/zh/, /en/), so nothing here toggles
   language. `.bilingual` is the exception: notices that §3.5 and §4.2 require
   to appear in BOTH languages at once, whichever page they are on. */
.bilingual { display: grid; gap: var(--sp-1); }
.bilingual > [lang="en"] { color: var(--c-ink-faint); font-size: var(--fs-micro); }