:root {
  --paper: #f3ece0;
  --paper-2: #e7dccb;
  --foam: #faf6ee;
  --zitan: #4a2a1c;
  --zitan-deep: #2a1610;
  --daiqing: #3a5c5a;
  --daiqing-2: #c5d4d1;
  --cinnabar: #9c2b1d;
  --ghost: #b7b09f;
  --ink: #241812;
  --mute: #6b5c50;
  --line: rgba(74, 42, 28, 0.18);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 120px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  padding-left: 52px;
}

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

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

.app-link {
  color: var(--cinnabar);
  text-decoration: underline;
  text-underline-offset: 3px;
}

button {
  font-family: inherit;
  cursor: pointer;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(74, 42, 28, 0.08);
  padding: 0.05em 0.4em;
}

.fiber {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 4;
  opacity: 0.14;
  background-image: url("images/texture.webp");
  background-size: 420px auto;
  mix-blend-mode: multiply;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 64px;
  top: 12px;
  z-index: 70;
  background: var(--zitan);
  color: var(--paper);
  padding: 8px 12px;
}

.spine {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 52px;
  z-index: 45;
  background: var(--zitan-deep);
  color: var(--paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0;
  writing-mode: vertical-rl;
  letter-spacing: 0.28em;
  font-family: var(--serif);
  font-size: 15px;
  border-right: 1px solid rgba(243, 236, 224, 0.12);
}

.spine span:last-child {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  opacity: 0.7;
}

.folio-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 28px;
  background: rgba(243, 236, 224, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 4px solid var(--zitan);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 700;
}

.brand small {
  display: block;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.cell-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 2px solid var(--zitan);
  color: var(--zitan);
  font-family: var(--serif);
  background: var(--foam);
}

.nav-toggle {
  display: none;
  background: var(--foam);
  border: 1px solid var(--zitan);
  color: var(--zitan);
  padding: 6px 12px;
}

.folio-nav {
  display: flex;
  gap: 16px;
  font-size: 14px;
  align-items: center;
}

.folio-nav a {
  color: var(--mute);
}

.folio-nav a.is-active,
.folio-nav a:hover {
  color: var(--zitan);
}

.folio-nav .live {
  color: var(--paper);
  background: var(--zitan);
  padding: 6px 12px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(280px, 42%) 1fr;
  gap: 0;
  min-height: 92vh;
  border-bottom: 4px solid var(--zitan);
}

.catalog-slip {
  padding: 8vh 6vw 8vh 4vw;
  background:
    linear-gradient(90deg, transparent 0, transparent 12px, rgba(74, 42, 28, 0.08) 12px, rgba(74, 42, 28, 0.08) 13px, transparent 13px),
    var(--foam);
}

.kicker,
.vlabel {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 12px;
  color: var(--daiqing);
  margin: 0 0 12px;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.08;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(36px, 5.4vw, 72px);
}

h2 {
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.2;
}

h3 {
  font-size: 20px;
  line-height: 1.3;
}

.lead {
  font-size: 16.5px;
  max-width: 42em;
  color: var(--mute);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0;
}

.chip {
  border: 1px solid var(--line);
  padding: 4px 10px;
  font-size: 12px;
  font-family: var(--mono);
  background: var(--paper);
}

.chip.in {
  border-color: var(--daiqing);
  color: var(--daiqing);
}

.chip.ghost {
  color: var(--ghost);
  border-style: dashed;
}

.chip.late {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid currentColor;
  font-size: 14px;
}

.btn-fill {
  background: var(--zitan);
  color: var(--paper);
  border-color: var(--zitan);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.rosewood-frame {
  margin: 0;
  background: var(--zitan-deep);
  padding: 14px 14px 0;
  display: flex;
  flex-direction: column;
}

.rosewood-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 72vh;
  filter: saturate(0.92);
}

.rosewood-frame figcaption {
  color: var(--paper-2);
  font-size: 12px;
  padding: 10px 4px 14px;
  font-family: var(--mono);
}

.folio {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 96px 0 80px;
}

.folio-head {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  margin-bottom: 36px;
}

.folio-head p:last-child {
  color: var(--mute);
  margin: 0;
}

.duobao {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  grid-template-areas:
    "wide obj pain"
    "wide photo photo";
  gap: 10px;
  background: var(--zitan);
  padding: 10px;
}

.cell {
  background: var(--foam);
  padding: 22px;
  min-height: 180px;
}

.cell-wide {
  grid-area: wide;
}

.cell:nth-child(2) {
  grid-area: obj;
}

.cell:nth-child(3) {
  grid-area: pain;
}

.cell-photo {
  grid-area: photo;
  padding: 0;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
}

.cell-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 220px;
}

.cell-photo p {
  margin: 0;
  padding: 18px;
  color: var(--mute);
  font-size: 14px;
}

.stamp {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  padding: 2px 8px;
  margin-bottom: 10px;
  font-family: var(--mono);
}

.cell ul,
.io-pair ul,
.rule-list {
  margin: 0;
  padding-left: 1.1em;
}

.cell li,
.io-pair li,
.rule-list li {
  margin: 0.35em 0;
}

.paper-band {
  background: var(--paper-2);
  border-block: 1px solid var(--line);
}

.fold {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 3px solid var(--zitan);
}

.fold-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 56px;
}

.year-tick {
  position: absolute;
  left: -46px;
  top: 0;
  width: 36px;
  height: 36px;
  background: var(--zitan);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  display: grid;
  place-items: center;
}

.fold-item figure {
  margin: 0;
  border: 8px solid var(--zitan);
  background: var(--zitan);
}

.fold-item figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.fold-item figcaption {
  color: var(--paper-2);
  font-size: 12px;
  padding: 8px 6px 10px;
}

.loan-dial,
.ba-stage {
  margin-top: 18px;
  padding: 14px;
  border: 1px dashed var(--zitan);
  background: rgba(74, 42, 28, 0.04);
}

.dial-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
  font-family: var(--mono);
}

.slider {
  display: grid;
  grid-template-columns: 48px 1fr 72px;
  gap: 10px;
  align-items: center;
  font-size: 13px;
  color: var(--mute);
}

.slider input,
.ba-ctrl input {
  width: 100%;
  accent-color: var(--cinnabar);
}

.tri-state {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 13px;
}

.tri-state.ok {
  color: var(--daiqing);
}

.tri-state.warn {
  color: #8a5a20;
}

.tri-state.late {
  color: var(--cinnabar);
}

.ba-stage {
  position: relative;
  padding-bottom: 48px;
}

.ba-stage img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.ba-before-clip {
  position: absolute;
  left: 14px;
  top: 14px;
  width: 52%;
  overflow: hidden;
  border-right: 2px solid var(--cinnabar);
}

.ba-ctrl {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 10px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  font-family: var(--mono);
  color: var(--mute);
}

.bench-cabinet {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  background: var(--zitan);
  padding: 8px;
}

.bench-cabinet article {
  background: var(--foam);
  min-height: 140px;
  padding: 20px;
}

.bench-cabinet h3 {
  color: var(--daiqing);
}

.value-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.slip {
  background: var(--foam);
  padding: 20px;
  box-shadow: 3px 3px 0 var(--zitan);
  border: 1px solid var(--line);
}

.rule-list {
  max-width: 46em;
}

.io-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--zitan);
  padding: 8px;
}

.io-pair > div {
  background: var(--foam);
  padding: 22px;
}

footer {
  padding: 28px 28px 40px 28px;
  font-size: 13px;
  color: var(--mute);
  border-top: 4px solid var(--zitan);
}

@media (max-width: 980px) {
  body {
    padding-left: 0;
  }

  .spine {
    display: none;
  }

  .hero,
  .folio-head,
  .fold-item,
  .value-row,
  .io-pair,
  .cell-photo,
  .duobao {
    grid-template-columns: 1fr;
    grid-template-areas: none;
  }

  .duobao {
    display: flex;
    flex-direction: column;
  }

  .cell-wide,
  .cell:nth-child(2),
  .cell:nth-child(3),
  .cell-photo {
    grid-area: auto;
  }

  .rosewood-frame img {
    min-height: 42vh;
  }

  .bench-cabinet {
    grid-template-columns: 1fr 1fr;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .folio-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    background: var(--foam);
    border-bottom: 4px solid var(--zitan);
    padding: 12px 20px 20px;
    gap: 10px;
  }

  .folio-nav.open {
    display: flex;
  }

  .folio-bar {
    position: sticky;
  }
}