/* =====================================================================
   Flow × Zen Lab — Site shell & editorial-print design system
   Shared across Home / Work / About / Contact / Privacy / Rights.
   The Now experience keeps its own styles.css; this is the site chrome.
   ===================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --paper: #f4f1ea;
  --ink: #16140f;
  --ink-soft: #2a2820;
  --ink-mute: #6b6557;
  --ink-faint: #9a9382;
  --rule: #c9c3b5;
  --rule-strong: #16140f;

  --serif: 'Cormorant Garamond', Georgia, serif;
  --serif-zh: 'Noto Serif SC', 'Songti SC', serif;
  --sans: 'Inter', 'Noto Sans SC', -apple-system, system-ui, sans-serif;
  --sans-zh: 'Noto Sans SC', -apple-system, system-ui, sans-serif;
  --mono: 'Space Mono', ui-monospace, monospace;

  --maxw: 1180px;
  --gut: 6vw;
}

html, body { height: 100%; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }

/* ---- shared fonts are loaded per-page via <link>; this file assumes them ---- */

/* =====================================================================
   Site chrome — masthead, nav, colophon
   ===================================================================== */
.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 5vh var(--gut);
  max-width: var(--maxw);
  margin: 0 auto;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 2vh;
}
.masthead .mark {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 500;
  letter-spacing: 0.01em;
}
.masthead .meta {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--ink-mute);
}

/* language toggle — top right, small, unobtrusive */
.langtoggle {
  display: inline-flex;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: 999px;
  overflow: hidden;
}
.langtoggle button {
  background: none;
  border: none;
  color: var(--ink-mute);
  cursor: pointer;
  padding: 4px 12px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}
.langtoggle button.active {
  background: var(--ink);
  color: var(--paper);
}

/* primary nav */
.nav {
  display: flex;
  gap: 2.5rem;
  padding: 2.5vh 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.nav a { padding-bottom: 2px; border-bottom: 1px solid transparent; }
.nav a:hover { border-bottom-color: var(--ink-mute); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }

/* the page body lives between nav and colophon */
.page-body { flex: 1; }

/* colophon — 3-column footer */
.colophon {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  border-top: 1px solid var(--rule-strong);
  padding-top: 2.5vh;
  margin-top: 6vh;
  font-size: 0.8rem;
  color: var(--ink-mute);
}
.colophon .cell span {
  font-family: var(--mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.65rem;
  display: block;
  margin-bottom: 0.4vh;
  color: var(--ink-faint);
}
.colophon .cell a { border-bottom: 1px solid var(--rule); }
.colophon .cell a:hover { border-bottom-color: var(--ink-mute); }

/* =====================================================================
   Home — editorial-print layout (variant C)
   ===================================================================== */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--gut);
  padding: 4vh 0;
  align-items: start;
}
.lede {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--ink-soft);
  position: sticky;
  top: 4vh;
}
.lede em { font-style: italic; }

.work-list {
  display: flex;
  flex-direction: column;
  gap: 7vh;
}
.work-entry {
  border-top: 1px solid var(--rule);
  padding-top: 2.5vh;
}
.work-entry .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.5vh;
}
.work-entry .label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.work-entry .when {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
}
.work-entry .title {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 400;
  line-height: 1;
  margin-bottom: 1.5vh;
}
.work-entry .desc {
  font-size: 1rem;
  font-weight: 300;
  color: #4a4639;
  max-width: 38ch;
  line-height: 1.6;
  margin-bottom: 3vh;
}
.work-entry .enter {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}
.entry-links {
  display: flex;
  gap: 2rem;
  align-items: baseline;
}
.entry-links .enter.subtle {
  border-bottom-color: var(--rule);
  color: var(--ink-mute);
}
.entry-links .enter.subtle:hover {
  border-bottom-color: var(--ink-mute);
  color: var(--ink);
}

/* =====================================================================
   Work page — case study record (the experience is a separate standalone page)
   ===================================================================== */
.work-case {
  max-width: 60ch;
  padding: 8vh 0 4vh;
}
.work-case .section {
  border-top: 1px solid var(--rule);
  padding-top: 3vh;
  margin-bottom: 5vh;
}
.work-case .section:first-child { border-top: none; }
.work-case .section h2 {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 2vh;
  font-weight: 400;
}
.work-case .section h3 {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 1vh;
}
.work-case .decision {
  margin-bottom: 3vh;
}
.work-case .decision .why {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--ink-mute);
  line-height: 1.6;
}
.work-case .section p {
  font-size: 1rem;
  font-weight: 300;
  color: var(--ink-soft);
  margin-bottom: 1.5vh;
}
.work-case .section ul {
  margin: 1vh 0 1vh 1.2em;
}
.work-case .section li {
  font-weight: 300;
  color: var(--ink-soft);
  margin-bottom: 0.5vh;
}
.work-case .credit-form {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--rule);
  padding-left: 1.2rem;
  margin: 1vh 0;
}

/* =====================================================================
   Generic content page (About / Contact / Privacy / Rights)
   ===================================================================== */
.prose {
  max-width: 60ch;
  padding: 4vh 0;
}
.prose h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 4vh;
}
.prose h2 {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2.2vw, 1.8rem);
  font-weight: 500;
  margin-top: 4vh;
  margin-bottom: 1.5vh;
}
.prose p {
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--ink-soft);
  margin-bottom: 1.8vh;
}
.prose p.lede-line {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 4vh;
}
.prose ul { margin: 1vh 0 2vh 1.2em; }
.prose li { font-weight: 300; color: var(--ink-soft); margin-bottom: 0.6vh; }
.prose code, .prose .mono {
  font-family: var(--mono);
  font-size: 0.9em;
  background: rgba(0,0,0,0.04);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}
.prose .credit-form {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--rule);
  padding-left: 1.2rem;
  margin: 1vh 0;
}

/* =====================================================================
   CJK parallel system — applied when <html lang="zh"> or .lang-zh
   ===================================================================== */
[lang="zh"] .masthead .mark,
[lang="zh"] .lede,
[lang="zh"] .work-entry .title,
[lang="zh"] .prose h1,
[lang="zh"] .prose h2,
[lang="zh"] .prose p.lede-line,
[lang="zh"] .work-case .section h3,
[lang="zh"] .work-case .credit-form {
  font-family: var(--serif-zh);
  letter-spacing: 0;   /* CJK needs less tracking than Latin — reduce to zero */
}
[lang="zh"] .lede em,
[lang="zh"] .prose p.lede-line em { font-style: normal; }
[lang="zh"] .work-entry .title { font-weight: 500; line-height: 1.15; }
[lang="zh"] .work-case .credit-form { font-style: normal; }
[lang="zh"] body { font-family: var(--sans-zh); }
/* mono system marks stay Space Mono in both languages */

/* =====================================================================
   Responsive — collapse the home grid on narrow screens
   ===================================================================== */
@media (max-width: 760px) {
  .home-grid { grid-template-columns: 1fr; gap: 4vh; }
  .lede { position: static; }
  .colophon { grid-template-columns: 1fr; gap: 1.2rem; }
  .nav { gap: 1.5rem; flex-wrap: wrap; }
}