/* 沉默拍卖行 — night velvet, candle gold, hush */

:root {
  --bg: #120e0c;
  --bg-elevated: #1a1410;
  --bg-card: #1f1814;
  --velvet: #2a1818;
  --ink: #f2e8d8;
  --ink-soft: #c4b5a0;
  --ink-faint: #8a7d6e;
  --gold: #c9a87c;
  --gold-bright: #e4c9a0;
  --gold-dim: rgba(201, 168, 124, 0.22);
  --rose: #8a5a5a;
  --line: rgba(201, 168, 124, 0.14);
  --line-strong: rgba(201, 168, 124, 0.28);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
  --radius: 2px;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-en: "Cormorant Garamond", "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 4.25rem;
  --max: 1120px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  font-family: var(--font-display);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  overflow-x: hidden;
}

body.panel-open {
  overflow: hidden;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* Atmosphere */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9000;
  opacity: 0.055;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.velvet-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 70% 45% at 15% 0%, rgba(138, 90, 90, 0.14), transparent 55%),
    radial-gradient(ellipse 55% 40% at 90% 20%, rgba(201, 168, 124, 0.08), transparent 50%),
    radial-gradient(ellipse 80% 50% at 50% 100%, rgba(42, 24, 24, 0.5), transparent 60%);
}

.dust {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.dust-speck {
  position: absolute;
  border-radius: 50%;
  background: rgba(228, 201, 160, 0.65);
  animation: drift linear infinite;
}

@keyframes drift {
  0% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(12px, -40px);
  }
  100% {
    transform: translate(-8px, -80px);
    opacity: 0;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  background: rgba(18, 14, 12, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line-strong);
  color: var(--gold);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand-text strong {
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
}

.brand-text em {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav a {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  transition: color 0.2s var(--ease);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--gold-bright);
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  flex-direction: column;
  gap: 6px;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1px;
  background: var(--gold);
}

/* Hero */
.hero {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 10vw, 6.5rem) clamp(1.25rem, 4vw, 2.5rem) 3rem;
}

.hero-badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

.badge {
  color: var(--gold);
  border: 1px solid var(--line-strong);
  padding: 0.35rem 0.65rem;
}

.meta-dot {
  opacity: 0.4;
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
}

.title-en {
  font-family: var(--font-en);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(1.1rem, 2.5vw, 1.45rem);
  color: var(--gold);
  letter-spacing: 0.06em;
}

.title-zh {
  font-weight: 500;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  letter-spacing: 0.18em;
  line-height: 1.15;
  color: var(--ink);
}

.hero-lead {
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 400;
  color: var(--gold-bright);
  letter-spacing: 0.08em;
  margin-bottom: 0.85rem;
  max-width: 28em;
}

.hero-sub {
  max-width: 38em;
  color: var(--ink-soft);
  font-weight: 300;
  font-size: 0.98rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}

.btn-primary {
  background: var(--gold);
  color: #1a120c;
  border-color: var(--gold);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--gold-bright);
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--ink-soft);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--gold);
  color: var(--gold-bright);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 2rem;
  max-width: 40rem;
}

.stat {
  background: var(--bg-elevated);
  padding: 1rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-num {
  font-family: var(--font-en);
  font-size: 1.65rem;
  font-weight: 500;
  color: var(--gold-bright);
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.ticker {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  max-width: 40rem;
}

.ticker-label {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--rose);
  text-transform: uppercase;
}

.ticker p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-weight: 300;
  transition: opacity 0.4s var(--ease);
}

/* Sections */
.section {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5rem) clamp(1.25rem, 4vw, 2.5rem);
}

.section-head {
  margin-bottom: 2rem;
  max-width: 36em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 0.75rem;
}

.section-head h2 {
  font-weight: 500;
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  letter-spacing: 0.14em;
  margin-bottom: 0.65rem;
}

.section-sub {
  color: var(--ink-faint);
  font-weight: 300;
  font-size: 0.95rem;
}

/* Howto */
.howto-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.howto-card {
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(31, 24, 20, 0.9), rgba(18, 14, 12, 0.6));
  padding: 1.5rem 1.35rem 1.65rem;
  min-height: 100%;
}

.howto-num {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: 1.35rem;
  color: var(--gold);
  margin-bottom: 0.85rem;
}

.howto-card h3 {
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.65rem;
}

.howto-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-weight: 300;
}

/* Catalog */
.catalog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.filter-chip {
  padding: 0.45rem 0.9rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  border: 1px solid var(--line);
  color: var(--ink-faint);
  background: transparent;
  transition: all 0.2s var(--ease);
}

.filter-chip:hover,
.filter-chip:focus-visible {
  border-color: var(--lot-hue, var(--gold));
  color: var(--ink);
}

.filter-chip.is-active {
  border-color: var(--chip-hue, var(--gold));
  color: var(--bg);
  background: var(--chip-hue, var(--gold));
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.lot-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.35rem 1.25rem 1.25rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(201, 168, 124, 0.04), transparent 40%),
    var(--bg-card);
  cursor: pointer;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.lot-card:hover,
.lot-card:focus-within {
  border-color: color-mix(in srgb, var(--lot-hue, var(--gold)) 55%, transparent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.lot-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.lot-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--lot-hue, var(--gold));
}

.lot-cat {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.lot-title {
  font-weight: 500;
  font-size: 1.12rem;
  letter-spacing: 0.06em;
  line-height: 1.4;
}

.lot-title-en {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-faint);
  margin-bottom: 0.35rem;
}

.lot-blurb {
  font-size: 0.86rem;
  color: var(--ink-soft);
  font-weight: 300;
  flex: 1;
}

.lot-card-foot {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.lot-open {
  margin-top: 0.85rem;
  align-self: flex-start;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease);
}

.lot-card:hover .lot-open,
.lot-open:focus-visible {
  border-bottom-color: var(--gold);
}

.empty-hint {
  grid-column: 1 / -1;
  color: var(--ink-faint);
  padding: 2rem 0;
}

/* Rules */
.rules-list {
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.rule-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.25rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.rule-item h3 {
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.rule-item p {
  font-weight: 300;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Ledger */
.ledger-list {
  display: grid;
  gap: 0.85rem;
}

.ledger-empty {
  border: 1px dashed var(--line-strong);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--ink-soft);
}

.ledger-empty .muted {
  color: var(--ink-faint);
  font-size: 0.9rem;
  margin-top: 0.4rem;
}

.ledger-card {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1.25rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.ledger-paddle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, rgba(201, 168, 124, 0.12), transparent);
  min-height: 5rem;
}

.paddle-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}

.paddle-num {
  font-family: var(--font-en);
  font-size: 1.6rem;
  color: var(--gold-bright);
  line-height: 1.1;
}

.ledger-lot {
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}

.ledger-cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
}

.ledger-story {
  font-weight: 300;
  color: var(--ink-soft);
  font-size: 0.9rem;
  margin-bottom: 0.45rem;
}

.ledger-time {
  font-size: 0.78rem;
  color: var(--ink-faint);
}

/* Closing */
.closing-section {
  padding-bottom: 4rem;
}

.closing-quote {
  max-width: 32em;
  margin: 0 auto;
  text-align: center;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.closing-quote p {
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--ink-soft);
  line-height: 2;
  margin-bottom: 1rem;
}

.closing-quote footer {
  font-family: var(--font-en);
  font-style: italic;
  color: var(--ink-faint);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--line);
  padding: 2rem clamp(1.25rem, 4vw, 2.5rem) 3rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer-brand {
  letter-spacing: 0.1em;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

/* Panel */
.lot-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(8, 6, 5, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.28s var(--ease);
}

.lot-backdrop.is-open {
  opacity: 1;
}

.lot-panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 210;
  width: min(520px, 100%);
  height: 100%;
  background: var(--bg-elevated);
  border-left: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateX(100%);
  transition: transform 0.32s var(--ease);
  display: flex;
  flex-direction: column;
}

.lot-panel.is-open {
  transform: translateX(0);
}

.lot-close {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  z-index: 2;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  transition: color 0.2s, border-color 0.2s;
}

.lot-close:hover,
.lot-close:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.lot-panel-scroll {
  overflow-y: auto;
  padding: 2rem 1.5rem 3rem;
  flex: 1;
}

.panel-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-bottom: 0.75rem;
  padding-right: 2.5rem;
}

.panel-eyebrow .dot {
  opacity: 0.4;
}

.lot-panel h2 {
  font-weight: 500;
  font-size: 1.45rem;
  letter-spacing: 0.08em;
  line-height: 1.35;
  margin-bottom: 0.25rem;
  padding-right: 2rem;
}

.panel-en {
  font-family: var(--font-en);
  font-style: italic;
  color: var(--gold);
  margin-bottom: 1.5rem;
}

.lot-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1rem;
  padding: 1rem 0;
  margin-bottom: 1rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.lot-facts .full {
  grid-column: 1 / -1;
}

.lot-facts dt {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  margin-bottom: 0.15rem;
}

.lot-facts dd {
  font-size: 0.88rem;
  color: var(--ink-soft);
  font-weight: 300;
}

.panel-desc {
  font-weight: 300;
  color: var(--ink-soft);
  margin-bottom: 1.75rem;
  font-size: 0.95rem;
}

.panel-bids {
  margin-bottom: 2rem;
}

.panel-bids-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.panel-bids-head h3 {
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
}

.lead-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.lead-badge.muted {
  color: var(--ink-faint);
}

.bid-list {
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.bid-item {
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
  background: rgba(0, 0, 0, 0.2);
}

.bid-item.is-mine {
  border-color: var(--line-strong);
  background: rgba(201, 168, 124, 0.06);
}

.bid-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.85rem;
  margin-bottom: 0.45rem;
  font-size: 0.78rem;
}

.bid-alias {
  color: var(--gold-bright);
  letter-spacing: 0.04em;
}

.bid-weight {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
}

.bid-time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--ink-faint);
}

.bid-story {
  font-weight: 300;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}

.bid-seal {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.bid-empty {
  padding: 1.25rem;
  border: 1px dashed var(--line);
  color: var(--ink-faint);
  font-size: 0.9rem;
  text-align: center;
}

/* Bid form */
.bid-form {
  border: 1px solid var(--line-strong);
  padding: 1.25rem;
  background: linear-gradient(180deg, rgba(201, 168, 124, 0.05), transparent);
}

.bid-form h3 {
  font-weight: 500;
  letter-spacing: 0.12em;
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.form-hint {
  font-size: 0.84rem;
  color: var(--ink-faint);
  font-weight: 300;
  margin-bottom: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.field span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: var(--radius);
  resize: vertical;
  transition: border-color 0.2s;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--gold);
}

.field textarea {
  min-height: 7rem;
  line-height: 1.65;
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.char-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
}

.form-status {
  margin-top: 0.85rem;
  font-size: 0.85rem;
  color: var(--gold);
  min-height: 1.3em;
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.delay-1 {
  transition-delay: 0.08s;
}
.delay-2 {
  transition-delay: 0.16s;
}
.delay-3 {
  transition-delay: 0.24s;
}
.delay-4 {
  transition-delay: 0.32s;
}

/* Responsive */
@media (max-width: 900px) {
  .catalog-grid,
  .howto-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rule-item {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: grid;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 0;
    background: rgba(18, 14, 12, 0.96);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s var(--ease), opacity 0.28s var(--ease);
  }

  .nav.is-open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 0.9rem 1.5rem;
    border-top: 1px solid var(--line);
  }

  .catalog-grid,
  .howto-grid {
    grid-template-columns: 1fr;
  }

  .ledger-card {
    grid-template-columns: 1fr;
  }

  .ledger-paddle {
    flex-direction: row;
    gap: 0.75rem;
    min-height: auto;
    padding: 0.65rem;
  }

  .lot-panel {
    width: 100%;
  }

  .title-zh {
    letter-spacing: 0.1em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .dust-speck {
    animation: none;
  }

  .lot-panel,
  .lot-backdrop {
    transition: none;
  }
}