:root {
  --hue: 42;
  --bg: oklch(0.93 0.028 var(--hue));
  --bg-deep: oklch(0.88 0.04 var(--hue));
  --silk: oklch(0.965 0.018 88);
  --ink: oklch(0.28 0.04 48);
  --ink-soft: oklch(0.42 0.035 48);
  --cinnabar: oklch(0.5 0.17 32);
  --cinnabar-soft: oklch(0.72 0.1 32);
  --jade: oklch(0.52 0.08 158);
  --gold: oklch(0.72 0.12 78);
  --line: oklch(0.72 0.04 50 / 0.55);
  --surface: oklch(0.975 0.014 85);
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --font-display: "ZCOOL QingKe HuangYou", "Noto Serif TC", serif;
  --font-ui: "Huninn", "Noto Serif TC", sans-serif;
  --font-story: "Noto Serif TC", serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100dvh;
  color: var(--ink);
  font-family: var(--font-ui);
  background:
    radial-gradient(1200px 480px at 50% -8%, oklch(0.97 0.03 85) 0%, transparent 70%),
    repeating-linear-gradient(
      90deg,
      oklch(0.91 0.03 var(--hue) / 0.35) 0 1px,
      transparent 1px 72px
    ),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
}

button,
a {
  font-family: inherit;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--silk);
}

.skip-link:focus {
  top: 12px;
}

.screen {
  min-height: 100dvh;
}

.screen[hidden] {
  display: none !important;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--cinnabar);
}

h1,
h2,
.brand,
.btn-primary,
.topbar-title strong {
  font-family: var(--font-display);
}

/* Intro */
.screen-intro,
.screen-finale {
  display: grid;
  place-items: center;
  padding: var(--space-xl) var(--space-md);
}

.intro-frame,
.finale-card {
  width: min(100%, 42rem);
  padding: var(--space-2xl) var(--space-xl);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: 0 28px 60px oklch(0.4 0.05 48 / 0.12);
}

.intro-frame h1,
.finale-card h2 {
  margin: 8px 0 16px;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 400;
  line-height: 1.1;
}

.intro-lead,
.finale-card p {
  max-width: 38ch;
  margin: 0 0 12px;
  font-family: var(--font-story);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.intro-realms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
  padding: 0;
  list-style: none;
}

.intro-realms li {
  display: grid;
  gap: 6px;
  padding: var(--space-sm);
  font-size: 0.9rem;
}

.intro-realms li:nth-child(1) {
  background: oklch(0.9 0.07 250);
}

.intro-realms li:nth-child(2) {
  background: oklch(0.9 0.08 32);
}

.intro-realms li:nth-child(3) {
  background: oklch(0.88 0.07 155);
}

.intro-realms span {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.intro-realms li:nth-child(1) span {
  color: oklch(0.32 0.08 250);
}

.intro-realms li:nth-child(2) span {
  color: oklch(0.36 0.12 32);
}

.intro-realms li:nth-child(3) span {
  color: oklch(0.32 0.08 155);
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.intro-note {
  margin: var(--space-lg) 0 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.btn-primary,
.btn-secondary,
.btn-ghost,
.icon-btn,
.quiz-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  transition: transform 140ms var(--ease-out), background-color 200ms var(--ease-out);
}

.btn-primary,
.btn-secondary,
.btn-ghost {
  min-height: 44px;
  padding: 10px 18px;
  font-size: 1rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: var(--cinnabar);
  color: oklch(0.98 0.01 80);
}

.btn-secondary {
  background: oklch(0.9 0.04 80);
  color: var(--ink);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}

.btn-primary:hover,
.btn-secondary:hover,
.btn-ghost:hover,
.icon-btn:hover {
  transform: translateY(-1px);
}

.btn-primary:active,
.btn-secondary:active,
.quiz-btn:active {
  transform: translateY(1px);
}

/* Game chrome */
.screen-game {
  display: grid;
  grid-template-rows: auto 1fr;
  height: 100dvh;
}

.topbar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: oklch(0.96 0.02 80 / 0.92);
}

.brand {
  color: var(--cinnabar);
  text-decoration: none;
  font-size: 1.05rem;
}

.topbar-title {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar-title strong {
  font-size: 1.15rem;
  font-weight: 400;
}

.topbar-title span {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.topbar-tools {
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
}

.game-shell {
  display: grid;
  grid-template-columns: 72px 1fr minmax(340px, 440px);
  min-height: 0;
}

.stamp-rail {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 8px;
  border-right: 1px solid var(--line);
  overflow: auto;
  background: oklch(0.91 0.035 48);
}

.rail-label {
  margin: 0 0 4px;
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  color: oklch(0.96 0.02 80 / 0.8);
  writing-mode: horizontal-tb;
}

.stamp-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  justify-items: center;
}

.stamp {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1.5px solid oklch(0.78 0.05 48 / 0.5);
  color: oklch(0.78 0.04 48 / 0.55);
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-align: center;
  line-height: 1.1;
  transform: rotate(-8deg);
}

.stamp.is-found {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  background: oklch(0.96 0.03 50);
  transform: rotate(6deg);
}

.viewport {
  min-height: 0;
  overflow: auto;
  padding: 28px 16px 80px;
  outline: none;
}

.silk-mount {
  width: min(100%, calc(420px * var(--zoom, 1)));
  margin: 0 auto;
  transform-origin: top center;
}

.rod,
.rod-bottom {
  height: 10px;
  margin: 0 -8px;
  background: linear-gradient(90deg, oklch(0.45 0.06 55), oklch(0.62 0.08 70), oklch(0.45 0.06 55));
  box-shadow: 0 4px 10px oklch(0.35 0.04 50 / 0.25);
}

.silk {
  position: relative;
  margin: 0;
  background: var(--silk);
  box-shadow: 0 18px 40px oklch(0.35 0.04 50 / 0.16);
}

.silk img {
  display: block;
  width: 100%;
  height: auto;
  user-select: none;
  -webkit-user-drag: none;
}

.hotspot-layer {
  position: absolute;
  inset: 0;
}

.hotspot {
  position: absolute;
  width: max(44px, 8.5%);
  height: max(44px, 4.6%);
  transform: translate(-50%, -50%);
  border: 2px solid oklch(0.5 0.17 32 / 0.0);
  border-radius: 50%;
  background: oklch(0.5 0.17 32 / 0.0);
  cursor: pointer;
  padding: 0;
}

.hotspot:focus-visible {
  outline: 3px solid var(--cinnabar);
  outline-offset: 3px;
}

.hotspot::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 2px solid oklch(0.5 0.17 32 / 0.55);
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out);
}

.hotspot.is-target::after,
.hotspot.is-hint::after,
.mode-teacher .hotspot::after,
.mode-free .hotspot:not(.is-found)::after {
  opacity: 1;
  transform: scale(1);
}

.hotspot.is-target::after,
.hotspot.is-hint::after {
  animation: pulse-ring 1.8s var(--ease-out) infinite;
}

.hotspot.is-found::after {
  opacity: 1;
  border-color: var(--jade);
  background: oklch(0.52 0.08 158 / 0.18);
  animation: none;
}

.hotspot-label {
  position: absolute;
  left: 50%;
  top: calc(100% + 4px);
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 2px 6px;
  background: oklch(0.98 0.01 80 / 0.92);
  color: var(--ink);
  font-size: 0.7rem;
  pointer-events: none;
}

@keyframes pulse-ring {
  0%,
  100% { opacity: 0.35; transform: scale(0.92); }
  50% { opacity: 1; transform: scale(1.08); }
}

.dock {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 24px;
  border-left: 1px solid var(--line);
  background: var(--surface);
  overflow: auto;
}

.dock.is-reading {
  max-height: none;
}

.realm-chip {
  margin: 0;
  width: fit-content;
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.2;
  color: var(--ink);
  background: oklch(0.92 0.04 80);
}

.realm-chip[data-realm="天上"] {
  color: oklch(0.32 0.08 250);
  background: oklch(0.9 0.07 250);
}

.realm-chip[data-realm="人間"] {
  color: oklch(0.36 0.12 32);
  background: oklch(0.9 0.08 32);
}

.realm-chip[data-realm="地下"] {
  color: oklch(0.32 0.08 155);
  background: oklch(0.88 0.07 155);
}

#mission-title {
  margin: 0;
  font-size: 3.2rem;
  font-weight: 400;
  line-height: 1.2;
}

.mission-text,
.lore p,
.lore-meaning {
  margin: 0;
  font-family: var(--font-story);
  font-size: 2rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.dock-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.dock-actions .btn-secondary,
.dock-actions .btn-ghost {
  font-size: 1.25rem;
}

.lore-facts {
  margin: 0;
  padding-left: 1.2em;
  display: grid;
  gap: 10px;
  font-family: var(--font-story);
  font-size: 2rem;
  line-height: 1.65;
  color: var(--ink);
}

.catalog-group {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.catalog-btn {
  min-height: 52px;
  padding: 10px 14px;
  text-align: left;
  font-size: 1.6rem;
  font-family: var(--font-ui);
  color: var(--ink);
  background: oklch(0.97 0.01 80);
  border: 1px solid var(--line);
  cursor: pointer;
}

.catalog-btn:hover,
.catalog-btn:focus-visible {
  background: oklch(0.94 0.03 80);
}

.lore[hidden] {
  display: none !important;
}

.kind-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 1.6rem;
  color: var(--ink-soft);
}

.kind-row b {
  color: var(--cinnabar);
  font-weight: 400;
  font-family: var(--font-display);
}

.lore-meaning {
  padding: 12px;
  background: oklch(0.95 0.025 80);
}

.quiz {
  display: grid;
  gap: 8px;
}

.quiz h3 {
  margin: 8px 0 0;
  font-size: 2rem;
  font-family: var(--font-story);
}

.quiz-btn {
  min-height: 64px;
  padding: 12px 16px;
  text-align: left;
  font-size: 2rem;
  background: oklch(0.97 0.01 80);
  border: 1px solid var(--line);
  color: var(--ink);
}

.quiz-btn.is-correct {
  background: oklch(0.93 0.05 155);
  border-color: var(--jade);
}

.quiz-btn.is-wrong {
  background: oklch(0.93 0.04 32);
  border-color: var(--cinnabar-soft);
}

.feedback {
  min-height: 1.4em;
  font-size: 1.84rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 8;
  transform: translateX(-50%) translateY(12px);
  padding: 10px 16px;
  background: var(--ink);
  color: var(--silk);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out);
}

.toast.is-on {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.screen-finale {
  background:
    radial-gradient(circle at 50% 20%, oklch(0.72 0.12 78 / 0.28), transparent 42%),
    var(--bg);
}

@media (max-width: 900px) {
  .game-shell {
    grid-template-columns: 56px 1fr;
    grid-template-rows: 1fr auto;
  }

  .stamp-rail {
    grid-row: 1 / span 2;
  }

  .dock {
    border-left: 0;
    border-top: 1px solid var(--line);
    max-height: 38dvh;
  }

  .dock.is-reading {
    max-height: 52dvh;
  }
}

@media (max-width: 560px) {
  .intro-realms {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .intro-frame,
  .finale-card {
    padding: 28px 18px;
  }

  .topbar-title strong {
    font-size: 1rem;
  }

  .silk-mount {
    width: min(100%, calc(360px * var(--zoom, 1)));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}