:root {
  --paper: #f6f1e7;
  --paper-2: #fffdf8;
  --ink: #1c1c1c;
  --ink-soft: #6b6455;
  --rule: #e0d8c8;
  --rule-strong: #cdc2ad;
  --blue: #1a49c4;
  --green: #1f7a4d;
  --red: #b3401f;
  --gold: #f2c14e;
  --shadow: 0 1px 0 var(--rule-strong), 0 10px 30px rgba(60, 48, 24, 0.07);
  --nav-h: 56px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  background:
    radial-gradient(ellipse 60% 40% at 0% 0%, rgba(242, 193, 78, 0.22), transparent 55%),
    radial-gradient(ellipse 45% 30% at 100% 0%, rgba(26, 73, 196, 0.08), transparent 50%),
    var(--paper);
  min-height: 100dvh;
}

h1, h2, h3 {
  font-family: Fraunces, Georgia, serif;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0 0 0.4em;
}

p { margin: 0 0 0.75em; }
button { font: inherit; color: inherit; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: calc(var(--nav-h) + env(safe-area-inset-top));
  padding: 10px 18px;
  padding-top: max(10px, env(safe-area-inset-top));
  border-bottom: 1.5px solid var(--rule);
  background: rgba(246, 241, 231, 0.94);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-brand, .nav-logo, .nav-section {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}

.nav-logo { font-size: 13px; }
.nav-section { font-family: Fraunces, Georgia, serif; font-weight: 600; }
.nav-links { display: flex; gap: 14px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 12px;
}
.nav-links a:hover { color: var(--ink); }

.shell {
  width: min(100%, 1560px);
  max-width: none;
  margin: 0 auto;
  padding: 24px clamp(18px, 3vw, 48px) 64px;
  padding-left: max(clamp(18px, 3vw, 48px), env(safe-area-inset-left));
  padding-right: max(clamp(18px, 3vw, 48px), env(safe-area-inset-right));
}

.legal {
  max-width: 1560px;
  margin: 0 auto;
  padding: 0 18px 40px;
  color: var(--ink-soft);
  font-size: 12px;
}
.legal a { color: var(--blue); }

.modes {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}
.mode {
  appearance: none;
  border: 1.5px solid var(--ink);
  background: transparent;
  padding: 8px 14px;
  min-height: 40px;
  border-radius: 999px;
  cursor: pointer;
}
.mode.is-on { background: var(--ink); color: var(--paper); }

.walk-head {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(620px, 1.4fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: end;
  margin-bottom: 22px;
}
.story { max-width: 48rem; margin-bottom: 22px; }
.walk-head .story { margin-bottom: 0; }
.story h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.kicker {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.eyebrow {
  margin: 0 0 5px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  padding: 0;
  margin: 0;
  position: relative;
}
.step {
  border: 1.5px solid var(--rule-strong);
  background: var(--paper-2);
  padding: 8px 10px;
  border-radius: 10px;
  min-height: 58px;
  position: relative;
  z-index: 1;
}
.step-k { display: block; font-size: 11px; color: var(--ink-soft); }
.step-s { display: block; font-family: Fraunces, Georgia, serif; font-size: 14px; }
.step.is-on { border-color: var(--ink); box-shadow: var(--shadow); }
.step.is-done { background: #e8f0e4; }

.steps::before {
  content: "";
  position: absolute;
  left: 4%;
  right: 4%;
  top: 50%;
  height: 2px;
  background: var(--rule-strong);
}

.crumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  padding: 0;
  margin: 0 0 18px;
  font-size: 12px;
  color: var(--ink-soft);
}
.crumb button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  color: var(--blue);
  cursor: pointer;
  text-align: left;
  text-decoration: underline;
}
.crumb-sep { opacity: 0.45; }

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(300px, 0.85fr);
  gap: clamp(18px, 2.5vw, 36px);
  align-items: start;
}

.card, .memo, .translations, .quiz-card, .map-node, .map-out article, .flow-panel {
  background: var(--paper-2);
  border: 1.5px solid var(--rule-strong);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.card { padding: clamp(22px, 3vw, 38px); }
.card h2 { font-size: clamp(1.65rem, 2.7vw, 2.4rem); max-width: 27ch; }
.plain { color: var(--ink); max-width: 46rem; }

.cite-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0 4px;
  color: var(--ink-soft);
  font-size: 11px;
}
.cites { display: flex; flex-wrap: wrap; gap: 6px; }
.cite {
  appearance: none;
  border: 1px solid var(--rule-strong);
  background: #f4ead0;
  color: var(--ink);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 11px;
  cursor: help;
  min-height: 28px;
}
.cite:hover, .cite[aria-expanded="true"] {
  border-color: var(--ink);
  background: var(--gold);
}

.choices { display: grid; gap: 10px; margin-top: 16px; }
.choice {
  appearance: none;
  text-align: left;
  border: 1.5px solid var(--rule-strong);
  background: #fff;
  border-radius: 12px;
  padding: 15px 16px;
  cursor: pointer;
  min-height: 58px;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}
.choice:hover { border-color: var(--blue); transform: translateY(-1px); }
.choice.is-on { border-color: var(--blue); box-shadow: inset 0 0 0 1px var(--blue); }
.choice-key {
  width: 28px;
  height: 28px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 12px;
}
.choice-label { display: block; font-weight: 500; }
.choice .cite-row { grid-column: 2; margin-top: 0; }

.question-card { position: relative; overflow: hidden; }
.question-number {
  position: absolute;
  right: 20px;
  top: 18px;
  border-radius: 999px;
  background: var(--gold);
  padding: 5px 9px;
  font-size: 11px;
}
.plain-help {
  margin: 18px 0 10px;
  padding: 15px 17px;
  max-width: 62rem;
  border-left: 4px solid var(--gold);
  border-radius: 0 10px 10px 0;
  background: #fbf4e4;
}
.plain-help strong {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
}
.plain-help p { margin: 0; color: #4e493f; }

.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.btn {
  appearance: none;
  border: 1.5px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  padding: 8px 14px;
  min-height: 40px;
  cursor: pointer;
}
.btn.ghost { background: transparent; color: var(--ink); }

.guide {
  display: grid;
  gap: 16px;
  position: sticky;
  top: calc(var(--nav-h) + 12px);
}
.memo, .translations { padding: 18px 20px; }
.memo h2 { font-size: 1.1rem; }
.memo ol { margin: 0; padding-left: 1.1rem; }
.memo li { margin-bottom: 12px; }
.memo-recent li::marker { color: var(--blue); font-weight: 500; }
.memo-all {
  margin-top: 14px;
  border-top: 1px solid var(--rule);
  padding-top: 12px;
}
.memo-all summary { color: var(--blue); cursor: pointer; }
.memo-all ol { margin-top: 14px; }
.translations h2 { font-size: 1.1rem; }
.translations dl { margin: 0; display: grid; gap: 10px; }
.translations dl div {
  border-top: 1px solid var(--rule);
  padding-top: 9px;
}
.translations dt { font-weight: 500; font-size: 12px; }
.translations dd { margin: 3px 0 0; color: var(--ink-soft); font-size: 12px; }
.quiet { color: var(--ink-soft); }

.outcome.is-ok { border-color: var(--green); }
.outcome.is-wait { border-color: var(--gold); }
.outcome.is-out { border-color: var(--red); }
.ok-line { color: var(--green); }

.flow-panel {
  margin: 0 0 22px;
  padding: 16px 18px 18px;
  overflow: hidden;
}
.flow-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 12px;
}
.flow-head h2 { margin: 0; font-size: 1.2rem; }
.flow-head > p {
  max-width: 30rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
  text-align: right;
}
.flow-viewport {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-color: var(--rule-strong) transparent;
  padding: 2px 2px 10px;
}
.flow-track {
  display: flex;
  align-items: stretch;
  min-width: max-content;
}
.flow-node {
  appearance: none;
  width: 230px;
  min-height: 106px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: none;
  padding: 12px 14px;
  text-align: left;
  border: 1.5px solid var(--rule-strong);
  border-radius: 12px;
  background: #fff;
}
button.flow-node { cursor: pointer; }
button.flow-node:hover { border-color: var(--blue); }
.flow-node.is-current {
  border-color: var(--blue);
  box-shadow: inset 0 0 0 1px var(--blue);
  background: #eef3ff;
}
.flow-state {
  color: var(--blue);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.flow-node.is-done .flow-state { color: var(--green); }
.flow-step { color: var(--ink-soft); font-size: 10px; }
.flow-node strong {
  font-family: Fraunces, Georgia, serif;
  font-size: 14px;
  line-height: 1.25;
}
.flow-connector {
  width: 190px;
  flex: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 26px;
  align-items: center;
  padding: 0 8px;
  color: var(--ink-soft);
}
.flow-connector span {
  padding: 7px 9px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: var(--paper);
  font-size: 10px;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.flow-connector b {
  font-size: 24px;
  color: var(--blue);
  text-align: center;
}

.quiz-grid, .map-out-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}
.quiz-card {
  appearance: none;
  text-align: left;
  padding: 16px;
  cursor: pointer;
  display: grid;
  gap: 8px;
}
.quiz-card:hover { border-color: var(--ink); }
.quiz-card span:last-child {
  color: var(--ink-soft);
  font-size: 13px;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.map {
  display: grid;
  grid-template-columns: repeat(6, minmax(185px, 1fr));
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 8px;
}
.map-col h2 {
  font-size: 1rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.map-col h2 span { font-family: 'DM Mono', monospace; font-size: 12px; color: var(--ink-soft); font-weight: 400; }
.map-node {
  appearance: none;
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px;
  margin-bottom: 8px;
  cursor: default;
}
.map-node strong { display: block; font-size: 13px; font-family: Fraunces, Georgia, serif; margin-bottom: 6px; }
.map-out { margin-top: 28px; }
.map-out article { padding: 14px; }
.map-out h3 { font-size: 1.05rem; }

.cite-pop {
  position: fixed;
  z-index: 40;
  width: min(420px, calc(100vw - 24px));
  max-height: min(60vh, 420px);
  overflow: auto;
  background: #1c1c1c;
  color: #f6f1e7;
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  pointer-events: auto;
}
.cite-id { font-size: 12px; color: var(--gold); margin-bottom: 6px; }
.cite-text { font-size: 13px; line-height: 1.45; }
.cite-src { font-size: 11px; color: #c9c2b2; margin: 0; }

@media (max-width: 900px) {
  .walk-head, .workbench { grid-template-columns: 1fr; }
  .guide { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .steps::before { display: none; }
  .map { grid-template-columns: repeat(2, minmax(160px, 1fr)); }
}

@media (max-width: 640px) {
  .nav { flex-wrap: wrap; }
  .nav-links { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 2px; }
  .shell { padding-top: 16px; }
  .modes { overflow-x: auto; }
  .mode { white-space: nowrap; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .choice, .mode, .btn, .quiz-card { min-height: 44px; }
  .cite { min-height: 32px; font-size: 12px; }
  .guide { grid-template-columns: 1fr; }
  .flow-head { display: block; }
  .flow-head > p { text-align: left; margin-top: 6px; }
  .flow-viewport {
    max-height: 390px;
    overflow-x: hidden;
    overflow-y: auto;
  }
  .flow-track {
    min-width: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }
  .flow-node { width: 100%; min-height: 88px; }
  .flow-connector {
    width: 100%;
    min-height: 66px;
    grid-template-columns: minmax(0, 1fr) 34px;
    padding: 7px 14px;
    border-left: 2px solid var(--blue);
    margin-left: 18px;
  }
  .flow-connector span { white-space: normal; }
  .flow-connector b { transform: rotate(90deg); }
  .question-number { position: static; display: inline-block; margin-bottom: 12px; }
  .card h2 { font-size: 1.65rem; }
}