:root {
  --shelf: #2f5042;
  --leather: #c4a574;
  --copper: #b87333;
  --paper: #efe6d4;
  --ink: #1c1812;
  --mute: #6e6456;
  --ok: #3d6b4a;
  --dead: #7a6a5a;
  --display: "EB Garamond", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "PT Mono", ui-monospace, Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 76px;
}

body {
  margin: 0;
  color: var(--paper);
  background:
    radial-gradient(900px 400px at 0 0, rgba(184, 115, 51, 0.12), transparent 50%),
    var(--shelf);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
}

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

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

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

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

.shelf-veil {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1;
  opacity: 0.22;
  background-image: url("images/texture.webp");
  background-size: 240px auto;
  mix-blend-mode: overlay;
}

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

.skip:focus {
  left: 12px;
  top: 8px;
  z-index: 40;
  background: var(--copper);
  color: #fff;
  padding: 6px 10px;
}

.vault-rail {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 22px;
  background: rgba(47, 80, 66, 0.94);
  border-bottom: 3px solid var(--leather);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 30px;
}

.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--leather);
  letter-spacing: 0.14em;
}

.copper-lock {
  width: 16px;
  height: 20px;
  border: 2px solid var(--copper);
  border-radius: 3px 3px 2px 2px;
  background: transparent;
  box-shadow: inset 0 8px 0 var(--copper);
}

.slip-nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 14px;
}

.slip-nav a.is-active {
  color: var(--leather);
  box-shadow: inset 0 -2px 0 var(--leather);
}

.slip-nav .live {
  background: var(--leather);
  color: var(--shelf);
  padding: 4px 10px;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--copper);
  color: #fff;
  border: 0;
  width: 42px;
  height: 42px;
  font-family: var(--display);
  font-size: 20px;
}

.hero,
.aisle {
  position: relative;
  z-index: 2;
  padding: 36px 40px 28px;
  max-width: 1040px;
  margin: 0 auto;
}

.compact-shelf {
  background:
    repeating-linear-gradient(90deg, rgba(196, 165, 116, 0.08) 0 14px, transparent 14px 28px);
}

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--leather);
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 700;
  line-height: 1.14;
  color: var(--paper);
}

h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.3rem);
  margin: 0 0 16px;
}

h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  margin: 0 0 8px;
}

h3 {
  font-size: 1.08rem;
  margin: 0 0 8px;
  color: var(--leather);
}

.lead {
  max-width: 68ch;
  color: #e6dcc8;
}

.spine-row {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 0;
  margin: 0 0 18px;
}

.hide-spine {
  background: linear-gradient(180deg, #d8bc8a, var(--leather));
  color: var(--ink);
  writing-mode: horizontal-tb;
  padding: 12px 10px;
  font-family: var(--mono);
  font-size: 12px;
  border-left: 6px solid #6b4a28;
  min-height: 88px;
}

.hide-spine small {
  display: block;
  margin-top: 6px;
}

.hide-spine.loan {
  border-left-color: var(--copper);
}

.hide-spine.lock {
  background: linear-gradient(180deg, #3a2a18, #1a120c);
  color: var(--leather);
  border-left-color: var(--copper);
}

.hide-spine.dead {
  opacity: 0.55;
  text-decoration: line-through;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.chip {
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid rgba(196, 165, 116, 0.45);
  padding: 3px 10px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 22px;
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
}

.btn-fill {
  background: var(--leather);
  color: var(--shelf);
}

.btn-ghost {
  border: 1px solid var(--leather);
}

figure {
  margin: 0;
}

figcaption {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--leather);
  margin-top: 8px;
}

.aisle-head {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  margin-bottom: 22px;
}

.aisle-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--leather);
  margin: 0;
}

.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.box-card {
  background: var(--paper);
  color: var(--ink);
  padding: 16px 18px;
  box-shadow: 8px 0 0 var(--leather);
}

.box-card h3 {
  color: var(--shelf);
}

.box-card ul {
  margin: 0;
  padding-left: 18px;
}

.box-card p {
  margin: 0;
}

.gate-list {
  margin: 0;
  padding-left: 20px;
}

.gate-list li {
  margin-bottom: 10px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 140px;
  gap: 24px;
  align-items: start;
}

.sim-label {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--leather);
  margin-bottom: 8px;
}

.sim-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

#sim {
  flex: 1;
  accent-color: var(--copper);
}

#sim-val {
  font-family: var(--mono);
  font-size: 28px;
  min-width: 3.6ch;
}

.tri-state {
  font-family: var(--mono);
  font-size: 14px;
}

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

.tri-state.ok {
  color: #8fd4a4;
}

.hint {
  color: var(--leather);
  font-size: 14px;
  opacity: 0.85;
}

.lamp-bay {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--leather);
}

.draft-lamp {
  width: 48px;
  height: 200px;
  border-radius: 4px 4px 20px 20px;
  background: #1a241c;
  box-shadow: 0 0 0 2px var(--leather);
}

.draft-lamp.dim {
  box-shadow: 0 0 0 2px var(--dead);
}

.draft-lamp.lit {
  background: radial-gradient(circle at 50% 20%, #f4e2b0, #b87333 60%, #2f5042);
  box-shadow: 0 0 24px rgba(244, 226, 176, 0.55);
}

.topic-rope {
  list-style: none;
  padding: 0;
  margin: 0;
}

.topic-rope li {
  padding: 10px 0 10px 16px;
  border-left: 4px solid var(--leather);
  margin-bottom: 8px;
  background: rgba(196, 165, 116, 0.08);
}

.call-slip {
  font-family: var(--mono);
}

.secret-seal {
  color: var(--copper);
}

.bound-list {
  columns: 2;
  margin: 0;
  padding-left: 18px;
}

.roll {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.roll th,
.roll td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid rgba(196, 165, 116, 0.25);
}

.roll th {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--leather);
}

.foot {
  position: relative;
  z-index: 2;
  padding: 28px 40px 48px;
  max-width: 1040px;
  margin: 0 auto;
  color: var(--leather);
  font-size: 14px;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }

  .slip-nav {
    display: none;
    position: absolute;
    top: 58px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #2f5042;
    padding: 12px 18px 18px;
    gap: 10px;
    border-bottom: 3px solid var(--leather);
  }

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

  .spine-row,
  .three,
  .aisle-head,
  .split,
  .bound-list {
    grid-template-columns: 1fr;
    columns: 1;
  }

  .hero,
  .aisle,
  .foot {
    padding-left: 18px;
    padding-right: 18px;
  }
}