/* layout.css — page chrome, category page, cards, sheets */

/* ── breakpoint wrapper ────────────────────────────────── */
.app-shell {
  background: var(--bg);
  color: var(--fg-1);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* ── constellation bar ─────────────────────────────────── */
.constellation {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 6px 24px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-sunk);
}
.constellation-grid {
  display: grid;
  grid-template-columns: repeat(17, minmax(0, 1fr));
  gap: 6px;
  flex: 0 1 auto;
  max-width: 340px;
}
.constellation-dot {
  position: relative;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--hairline-strong);
  cursor: default;
  transition: transform var(--d-1) var(--ease);
}
.constellation-dot:hover {
  transform: scale(1.4);
  background: var(--bg-raised);
}
.constellation-dot--current {
  background: var(--steep);
  border-color: var(--steep);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--steep) 22%, transparent);
}
.constellation-dot-label {
  position: absolute;
  inset: auto 50% calc(100% + 6px) auto;
  transform: translateX(50%);
  font-size: 9px;
  color: var(--fg-2);
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  padding: 2px 5px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--d-1) var(--ease);
  pointer-events: none;
}
.constellation-dot:hover .constellation-dot-label,
.constellation-dot--current .constellation-dot-label { opacity: 1; }

.constellation--collapsed {
  padding: 8px 16px;
  gap: 8px;
}

/* ── site header ───────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.site-header-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  color: var(--fg-1);
}
.brand-mark { display: inline-flex; color: var(--steep); }
.brand-wordmark { font-size: 14px; letter-spacing: 0.01em; }
.primary-nav {
  display: flex;
  gap: 22px;
  margin-left: 6px;
}
.primary-nav a {
  font-size: var(--t-body);
  color: var(--fg-2);
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--d-1) var(--ease), border-color var(--d-1) var(--ease);
}
.primary-nav a:hover { color: var(--fg-1); }
.primary-nav a[data-active="true"] {
  color: var(--fg-1);
  border-bottom-color: var(--steep);
}
.primary-nav--mobile {
  overflow-x: auto;
  padding: 0 16px 8px;
  gap: 18px;
  scrollbar-width: none;
}
.primary-nav--mobile::-webkit-scrollbar { display: none; }
.header-actions {
  margin-left: auto;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

/* ── main + page ───────────────────────────────────────── */
.page {
  flex: 1;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 64px;
}
.bp-1280 .page { max-width: 1280px; }
.bp-768  .page { max-width: 768px;  padding: 0 20px 48px; }
.bp-390  .page { max-width: 390px;  padding: 0 16px 40px; }

/* ── category header ──────────────────────────────────── */
.cat-header {
  padding: 40px 0 28px;
  border-bottom: 1px solid var(--hairline);
}
.bp-390 .cat-header { padding: 24px 0 20px; }
.cat-header-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.cat-header-crumbs {
  font-size: 11px;
  color: var(--fg-2);
}
.cat-header-title { max-width: 720px; }
.cat-h1 {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.05;
  margin: 0 0 16px;
  color: var(--fg-1);
  text-wrap: balance;
}
.cat-h1-hanzi {
  display: inline-block;
  margin-left: 18px;
  color: var(--fg-3);
  font-weight: 400;
  font-size: 0.6em;
  vertical-align: 0.18em;
}
.bp-390 .cat-h1 { font-size: 32px; }
.bp-390 .cat-h1-hanzi { display: block; margin-left: 0; margin-top: 2px; font-size: 22px; vertical-align: 0; }
.cat-lede {
  font-size: var(--t-headline);
  line-height: 1.6;
  color: var(--fg-2);
  margin: 0;
  text-wrap: pretty;
  max-width: 60ch;
}

.cat-header-facets {
  display: grid;
  grid-template-columns: repeat(4, 1fr) 1.4fr;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  margin-top: 28px;
  border-radius: var(--r-md);
  overflow: hidden;
}
.bp-768 .cat-header-facets { grid-template-columns: repeat(2, 1fr); }
.bp-390 .cat-header-facets { grid-template-columns: 1fr 1fr; }
.cat-facet {
  background: var(--bg-raised);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background var(--d-1) var(--ease);
}
.cat-facet:hover { background: var(--bg-sunk); }
.cat-facet-num {
  font-size: 28px;
  font-weight: 400;
  color: var(--fg-1);
  letter-spacing: -0.02em;
  line-height: 1;
}
.cat-facet-label {
  font-size: var(--t-footnote);
  color: var(--fg-2);
}
.cat-facet--guide {
  background: var(--bg-sunk);
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  color: var(--fg-1);
}
.cat-facet--guide .cat-facet-label { font-size: var(--t-body); color: var(--fg-1); }
.bp-768 .cat-facet--guide, .bp-390 .cat-facet--guide {
  grid-column: 1 / -1;
}

/* ── body two-column ──────────────────────────────────── */
.cat-body {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  padding-top: 28px;
}
.bp-768 .cat-body, .bp-390 .cat-body { grid-template-columns: 1fr; gap: 18px; padding-top: 18px; }

/* ── filters sidebar ──────────────────────────────────── */
.filters {
  position: sticky;
  top: 88px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.filters-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.filter-block { display: flex; flex-direction: column; gap: 8px; }
.filter-label { color: var(--fg-2); }
.filter-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
  cursor: default;
  font-family: var(--font-sans);
}
.chip:hover { border-color: var(--hairline-strong); }

.link-btn {
  font-size: var(--t-footnote);
  color: var(--fg-2);
  background: none;
  border: 0;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: default;
}
.link-btn:hover { color: var(--fg-1); }

.filters-summary {
  font-size: var(--t-footnote);
}
.filters-summary strong { color: var(--fg-1); font-weight: 500; }

/* ── results toolbar ──────────────────────────────────── */
.results-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  flex-wrap: wrap;
}
.results-toolbar-left, .results-toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.seg {
  display: inline-flex;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
  padding: 2px;
  background: var(--bg-raised);
}
.seg button {
  width: 28px;
  height: 26px;
  border-radius: var(--r-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-2);
  cursor: default;
}
.seg button[data-active="true"] {
  background: var(--fg-1);
  color: var(--bg);
}
.sort {
  display: inline-flex;
  align-items: center;
  font-size: var(--t-footnote);
  color: var(--fg-2);
}
.sort select {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  font-size: var(--t-body);
  color: var(--fg-1);
  background: var(--bg-raised);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
  padding: 6px 28px 6px 12px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='%235a554a' d='M0 0h10L5 6z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: default;
}

/* ── results grid ─────────────────────────────────────── */
.results-grid {
  display: grid;
  gap: 24px;
}
.layout-grid.bp-1280 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.layout-grid.bp-768  { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.layout-grid.bp-390  { grid-template-columns: 1fr; }
.layout-grid.density-dense.bp-1280 { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.layout-grid.density-editorial.bp-1280 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px; }

.layout-row { grid-template-columns: 1fr; gap: 14px; }

/* ── equipment card ───────────────────────────────────── */
.eq-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: transparent;
  border: 0;
  padding: 0;
}
.eq-card-photo-wrap { position: relative; }
.eq-card-save {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: color-mix(in oklch, var(--bg-raised) 85%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--hairline);
  color: var(--fg-1);
  cursor: default;
  transition: background var(--d-1) var(--ease);
}
.eq-card-save:hover { background: var(--bg-raised); }
.eq-card-body { display: flex; flex-direction: column; gap: 8px; }
.eq-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.eq-card-name {
  font-size: var(--t-title3);
  letter-spacing: -0.005em;
  color: var(--fg-1);
  line-height: 1.2;
}
.eq-card-hanzi {
  margin-left: 8px;
  color: var(--fg-3);
  font-weight: 400;
}
.eq-card-hanzi[data-prom="loud"] { font-size: 20px; color: var(--fg-2); }
.eq-card-hanzi[data-prom="balanced"] { font-size: 15px; }
.eq-card-hanzi[data-prom="quiet"] { font-size: 12px; opacity: 0.55; }
.eq-card-meta {
  font-size: var(--t-footnote);
  color: var(--fg-2);
  margin-top: 2px;
}
.eq-card-note {
  font-size: var(--t-footnote);
  color: var(--fg-2);
  line-height: 1.5;
  margin: 0;
  text-wrap: pretty;
}
.eq-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
  margin-top: 4px;
}
.eq-card-foot > div { display: flex; flex-direction: column; gap: 2px; }
.eq-card-artisan { font-size: 11px; color: var(--fg-3); }
.eq-card-price {
  font-size: var(--t-headline);
  color: var(--fg-1);
  letter-spacing: 0;
}
.eq-card-stock {
  font-size: var(--t-caption);
  color: var(--steep);
  letter-spacing: 0.04em;
}
.eq-card-stock--out { color: var(--fg-3); }

/* dense variant — tighter */
.density-dense .eq-card-name { font-size: var(--t-headline); }
.density-dense .eq-card-note { display: none; }
.density-dense .eq-card { gap: 10px; }
.density-dense .eq-card-foot { padding-top: 6px; }

/* editorial variant — generous */
.density-editorial .eq-card-name { font-size: var(--t-title2); }
.density-editorial .eq-card { gap: 18px; }
.density-editorial .eq-card-note { font-size: var(--t-body); }

/* row layout */
.eq-card--row {
  flex-direction: row;
  gap: 18px;
  padding: 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: var(--bg-raised);
}
.eq-card--row .ph { width: 140px; flex-shrink: 0; }
.eq-card--row .eq-card-body { flex: 1; }

/* ── material badge ───────────────────────────────────── */
.mat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px 3px 6px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
  font-size: var(--t-caption);
  align-self: flex-start;
}
.mat-badge-swatch {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── empty state ──────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  max-width: 480px;
  margin: 24px auto;
}
.empty-state p { color: var(--fg-2); margin: 0; }

/* ── primer (Yixing field notes) ──────────────────────── */
.primer {
  margin-top: 80px;
  padding-top: 56px;
  border-top: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 56px;
  align-items: start;
}
.bp-768 .primer, .bp-390 .primer { grid-template-columns: 1fr; gap: 24px; margin-top: 56px; padding-top: 32px; }
.primer-rail .primer-h {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 400;
  margin: 16px 0 12px;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--fg-1);
  text-wrap: balance;
}
.primer-h-hanzi {
  display: inline-block;
  margin-right: 8px;
  font-size: 1.1em;
  color: var(--fg-3);
}
.primer-lede {
  color: var(--fg-2);
  line-height: 1.65;
  text-wrap: pretty;
}
.primer-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
.bp-390 .primer-grid { grid-template-columns: 1fr; }
.primer-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: var(--bg-raised);
}
.primer-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.primer-card-hanzi {
  font-size: 24px;
  color: var(--fg-2);
}
.primer-card-name {
  font-size: var(--t-footnote);
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.primer-card-note {
  font-size: var(--t-footnote);
  color: var(--fg-2);
  margin: 0;
  line-height: 1.5;
}

/* ── filters sheet (mobile/tablet) ────────────────────── */
.sheet {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: flex-end; justify-content: center;
}
.sheet-backdrop {
  position: absolute; inset: 0;
  background: color-mix(in oklch, var(--fg-1) 30%, transparent);
  animation: fade-in var(--d-2) var(--ease);
}
.sheet-panel {
  position: relative;
  width: 100%;
  max-width: 540px;
  max-height: 80vh;
  background: var(--bg);
  border-top-left-radius: var(--r-xl);
  border-top-right-radius: var(--r-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slide-up var(--d-3) var(--ease);
}
.sheet-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--hairline);
}
.sheet-panel .filters {
  position: static;
  overflow-y: auto;
  padding: 18px 20px;
  flex: 1;
}
.sheet-foot {
  display: flex; gap: 10px; justify-content: space-between;
  padding: 14px 20px;
  border-top: 1px solid var(--hairline);
  background: var(--bg-raised);
}
.sheet-foot .btn--primary { flex: 1; justify-content: center; }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes slide-up { from { transform: translateY(16px); opacity: 0; } to { transform: none; opacity: 1; } }

/* ── footer ───────────────────────────────────────────── */
.site-footer {
  margin-top: auto;
  padding: 56px 24px 32px;
  background: var(--bg-sunk);
  border-top: 1px solid var(--hairline);
}
.bp-390 .site-footer { padding: 36px 16px 24px; }
.site-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  max-width: 1280px;
  margin: 0 auto 28px;
}
.bp-768 .site-footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
.bp-390 .site-footer-grid { grid-template-columns: 1fr; gap: 24px; }
.ftcol { display: flex; flex-direction: column; gap: 8px; }
.ftcol a {
  font-size: var(--t-body);
  color: var(--fg-2);
  transition: color var(--d-1) var(--ease);
}
.ftcol a:hover { color: var(--fg-1); }
.ftcol .eyebrow { margin-bottom: 4px; }
.site-footer-meta {
  display: flex;
  gap: 18px;
  justify-content: space-between;
  max-width: 1280px;
  margin: 20px auto 0;
  font-size: var(--t-caption);
  color: var(--fg-3);
  flex-wrap: wrap;
}

/* ── frame chrome (breakpoint preview) ────────────────── */
.frame-host {
  background:
    radial-gradient(circle at 50% -20%, color-mix(in oklch, var(--steep) 6%, transparent), transparent 60%),
    #e6dfcd;
  min-height: 100vh;
  padding: 40px 0 80px;
}
[data-theme="dark"] .frame-host {
  background:
    radial-gradient(circle at 50% -20%, color-mix(in oklch, var(--steep) 14%, transparent), transparent 60%),
    #0e0d0a;
}
.frame-host-toolbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.frame-host-toolbar .seg button {
  width: auto;
  padding: 0 14px;
  height: 30px;
  gap: 6px;
  font-size: var(--t-footnote);
  color: var(--fg-2);
}
.frame-host-toolbar .seg button[data-active="true"] { color: var(--bg); }
.frame-host-toolbar .seg-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--t-caption);
  color: var(--fg-3);
  margin-right: 4px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.frame {
  margin: 0 auto;
  background: var(--bg);
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.4),
              0 8px 24px -16px rgba(0, 0, 0, 0.18);
  transition: max-width var(--d-3) var(--ease);
}
.frame.bp-1280 { max-width: 1280px; }
.frame.bp-768  { max-width: 768px;  }
.frame.bp-390  { max-width: 390px;  }
.frame-stage {
  height: min(880px, 90vh);
  overflow-y: auto;
}
.frame-meta {
  text-align: center;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.06em;
}