:root {
  color-scheme: light;
  --ink: #153c36;
  --ink-soft: #536f69;
  --paper: #f7f1df;
  --cream: #fffaf0;
  --jade: #1b6557;
  --jade-dark: #103f38;
  --mint: #dcebd7;
  --gold: #f5b82e;
  --coral: #e76f51;
  --sky: #c9e8e5;
  --danger: #b94d3a;
  --shadow: 0 22px 70px rgba(16, 63, 56, 0.16);
  font-family: "Avenir Next", "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(245, 184, 46, 0.18), transparent 28%),
    radial-gradient(circle at 88% 94%, rgba(27, 101, 87, 0.14), transparent 32%),
    var(--paper);
}

button { color: inherit; font: inherit; }

button:focus-visible,
[tabindex]:focus-visible {
  outline: 4px solid rgba(245, 184, 46, 0.78);
  outline-offset: 3px;
}

.app-shell {
  width: min(1500px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 20px clamp(16px, 3vw, 44px) 14px;
  display: flex;
  flex-direction: column;
}

.topbar {
  min-height: 72px;
  display: grid;
  grid-template-columns: minmax(240px, .9fr) minmax(260px, 1.1fr) minmax(230px, .9fr);
  align-items: center;
  gap: 28px;
  margin-bottom: 18px;
}

.brand {
  padding: 0;
  border: 0;
  display: flex;
  gap: 12px;
  align-items: center;
  text-align: left;
  cursor: pointer;
  background: transparent;
}

.brand-mark {
  width: 50px;
  height: 50px;
  border-radius: 16px 16px 16px 5px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--coral);
  box-shadow: 0 8px 20px rgba(231, 111, 81, 0.28);
  font: 900 27px Georgia, serif;
}

.brand strong, .brand small { display: block; }
.brand strong { font-size: 18px; letter-spacing: .02em; }
.brand small { margin-top: 2px; color: var(--ink-soft); font-size: 12px; }

.progress-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .06em;
}

.progress-track {
  height: 9px;
  padding: 2px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(21, 60, 54, .11);
}

#progress-bar {
  width: 0;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--gold), #ffd968);
  transition: width 420ms ease;
}

.top-actions { display: flex; justify-content: flex-end; gap: 10px; }

.icon-button {
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid rgba(21, 60, 54, .13);
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(255, 250, 240, .72);
  cursor: pointer;
}

.icon-button:hover { border-color: rgba(21, 60, 54, .3); background: #fff; }

.game-layout {
  min-height: 0;
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(330px, .72fr);
  border: 1px solid rgba(21, 60, 54, .12);
  border-radius: 32px;
  overflow: hidden;
  background: rgba(255, 250, 240, .82);
  box-shadow: var(--shadow);
}

.story-panel {
  min-height: 650px;
  padding: clamp(18px, 2.8vw, 38px);
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, rgba(255,255,255,.35), transparent 35%), var(--mint);
}

.world-chip {
  align-self: flex-start;
  margin-bottom: 16px;
  padding: 7px 12px;
  border: 1px solid rgba(21, 60, 54, .14);
  border-radius: 999px;
  color: var(--jade-dark);
  background: rgba(255,255,255,.55);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: .13em;
}

.scene {
  min-height: 500px;
  flex: 1;
  position: relative;
  overflow: hidden;
  border: 7px solid rgba(255, 250, 240, .74);
  border-radius: 26px;
  background: #b9e0dc;
  box-shadow: inset 0 0 0 1px rgba(21, 60, 54, .12);
}

.scene > svg, .scene-svg {
  width: 100%;
  height: 100%;
  min-height: 500px;
  display: block;
}

.scene-overlay {
  position: absolute;
  inset: 0;
  padding: clamp(22px, 5vw, 58px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  color: #fff;
  background: linear-gradient(90deg, rgba(9,47,42,.9), rgba(9,47,42,.18));
}

.scene-kicker {
  margin-bottom: 12px;
  color: #ffe18a;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.scene-overlay h1 {
  max-width: 570px;
  margin: 0 0 14px;
  font: 800 clamp(38px, 5.2vw, 72px)/.98 Georgia, "Microsoft YaHei", serif;
}

.scene-overlay p {
  max-width: 560px;
  margin: 0;
  color: rgba(255,255,255,.9);
  font-size: clamp(16px, 1.5vw, 21px);
  line-height: 1.65;
}

.scene-number { margin-top: 28px; display: inline-flex; align-items: center; gap: 10px; font-weight: 760; }
.scene-number span { width: 39px; height: 39px; display: grid; place-items: center; border-radius: 50%; color: var(--ink); background: var(--gold); }

.mission-panel {
  padding: clamp(28px, 3.5vw, 48px);
  display: flex;
  flex-direction: column;
  background: var(--cream);
}

.mission-panel h1 {
  margin: 8px 0 10px;
  font: 800 clamp(29px, 3vw, 42px)/1.08 Georgia, "Microsoft YaHei", serif;
}

.mission-panel > p { margin: 0; color: var(--ink-soft); line-height: 1.68; }
.mission-kicker { color: var(--coral); font-size: 11px; font-weight: 900; letter-spacing: .16em; }
.task-area { margin: 28px 0 20px; }

.prompt-card {
  padding: 18px;
  border: 1px solid rgba(21,60,54,.1);
  border-radius: 18px;
  background: #fff;
}

.prompt-label, .eyebrow {
  display: block;
  margin-bottom: 6px;
  color: var(--coral);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.prompt-english { margin: 0; font: 780 27px/1.2 Georgia, serif; }
.prompt-subtle { margin: 7px 0 0; color: var(--ink-soft); font-size: 13px; }

.listen-button {
  width: 100%;
  margin-top: 12px;
  padding: 11px 14px;
  border: 0;
  border-radius: 13px;
  color: var(--jade-dark);
  background: var(--sky);
  font-weight: 800;
  cursor: pointer;
}

.hint-card {
  margin-top: auto;
  padding: 16px 17px;
  border: 1px dashed rgba(21,60,54,.25);
  border-radius: 16px;
  background: rgba(220,235,215,.48);
}

.hint-card p { min-height: 38px; margin: 7px 0 10px; color: var(--ink-soft); font-size: 13px; line-height: 1.55; }
.hint-heading { font-size: 12px; font-weight: 850; }
.text-button { padding: 0; border: 0; color: var(--jade); background: transparent; font-size: 12px; font-weight: 850; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.mission-footer { margin-top: 18px; display: flex; gap: 10px; }

.primary-button, .secondary-button, .danger-button {
  min-height: 52px;
  padding: 12px 20px;
  border-radius: 15px;
  font-weight: 850;
  cursor: pointer;
}

.primary-button { flex: 1; border: 0; color: #fff; background: var(--jade); box-shadow: 0 11px 20px rgba(27,101,87,.2); }
.primary-button:hover:not(:disabled) { transform: translateY(-1px); background: var(--jade-dark); }
.primary-button:disabled { opacity: .42; cursor: not-allowed; box-shadow: none; }
.secondary-button { border: 1px solid rgba(21,60,54,.16); background: transparent; }
.danger-button { border: 1px solid rgba(185,77,58,.24); color: var(--danger); background: #fff3ee; }
.compact { min-height: 44px; flex: 0 0 auto; }

.feedback {
  position: absolute;
  z-index: 20;
  left: 50%;
  bottom: 52px;
  padding: 12px 19px;
  border-radius: 999px;
  color: #fff;
  background: var(--jade-dark);
  box-shadow: 0 12px 30px rgba(9,47,42,.28);
  font-weight: 760;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition: 180ms ease;
}

.feedback.show { opacity: 1; transform: translate(-50%, 0); }
.feedback.error { background: #7f4337; }

.hotspot {
  cursor: pointer;
  transition: filter 160ms ease, transform 160ms ease;
  transform-box: fill-box;
  transform-origin: center;
}

.hotspot:hover, .hotspot:focus-visible { filter: brightness(1.1) drop-shadow(0 0 8px rgba(255,222,114,.9)); transform: scale(1.035); }
.hotspot.found { filter: saturate(.78) brightness(1.08); }
.hotspot.hint-pulse { animation: pulse 800ms ease-in-out infinite alternate; }
@keyframes pulse { from { filter: drop-shadow(0 0 3px rgba(255,214,80,.4)); } to { filter: drop-shadow(0 0 15px rgba(255,214,80,1)); } }

.object-label {
  pointer-events: none;
  font-size: 17px;
  font-weight: 900;
  paint-order: stroke;
  stroke: rgba(255,255,255,.9);
  stroke-width: 4px;
  opacity: 0;
  transition: opacity 160ms ease;
}
.object-label.visible { opacity: 1; }

.choice-grid, .move-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; }

.choice-button, .move-button, .scene-action-button {
  min-height: 68px;
  padding: 12px;
  border: 1px solid rgba(21,60,54,.12);
  border-radius: 15px;
  background: #fff;
  cursor: pointer;
  font-weight: 830;
}

.choice-button:hover, .move-button:hover, .scene-action-button:hover { border-color: #ca8217; background: #fff9e8; }
.choice-button.done, .move-button.done { border-color: rgba(27,101,87,.25); color: var(--jade); background: #e9f5e6; }
.button-icon { display: block; margin-bottom: 3px; font-size: 24px; }
.waterfall-controls { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; }
.waterfall-controls .scene-action-button { color: var(--jade-dark); background: var(--sky); }
.waterfall-controls .completed { color: #fff; background: var(--jade); }

.chip-bank, .answer-zone { min-height: 58px; padding: 10px; border-radius: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.chip-bank { border: 1px solid rgba(21,60,54,.12); background: rgba(255,255,255,.7); }
.answer-zone { margin-bottom: 10px; border: 2px dashed rgba(21,60,54,.2); background: rgba(220,235,215,.45); }

.word-chip {
  padding: 9px 11px;
  border: 1px solid rgba(21,60,54,.14);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 4px 10px rgba(21,60,54,.06);
  cursor: pointer;
  font: 720 15px Georgia, serif;
}
.answer-zone .word-chip { color: #fff; background: var(--jade); }
.sentence-tabs { margin-bottom: 10px; display: flex; gap: 6px; }
.sentence-tab { padding: 6px 10px; border: 0; border-radius: 99px; color: var(--ink-soft); background: #eee7d8; cursor: pointer; font-size: 12px; font-weight: 800; }
.sentence-tab.active { color: #fff; background: var(--coral); }

.sequence-list { display: grid; gap: 8px; }
.sequence-card {
  padding: 11px 12px;
  border: 1px solid rgba(21,60,54,.12);
  border-radius: 13px;
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 8px;
  text-align: left;
  background: #fff;
  cursor: pointer;
}
.sequence-card.selected { border-color: #ca8217; background: #fff7d8; }
.order-number { width: 29px; height: 29px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--jade); font-weight: 900; }
.retell-steps { margin: 0; padding-left: 20px; color: var(--ink-soft); line-height: 1.7; }
.record-controls { margin-top: 13px; display: flex; flex-wrap: wrap; gap: 8px; }
.record-button, .playback-button { padding: 10px 12px; border: 1px solid rgba(21,60,54,.14); border-radius: 12px; background: #fff; cursor: pointer; font-weight: 800; }
.record-button.recording { color: #fff; background: var(--coral); animation: recording 900ms ease infinite alternate; }
@keyframes recording { to { box-shadow: 0 0 0 8px rgba(231,111,81,.13); } }

.privacy-note { padding: 12px 0 0; color: var(--ink-soft); text-align: center; font-size: 11px; }
.report-dialog { width: min(760px, calc(100% - 28px)); max-height: calc(100vh - 32px); padding: 0; border: 0; border-radius: 24px; color: var(--ink); background: var(--cream); box-shadow: 0 30px 90px rgba(9,47,42,.3); }
.report-dialog::backdrop { background: rgba(9,47,42,.58); backdrop-filter: blur(5px); }
.dialog-shell { padding: clamp(22px,4vw,38px); }
.dialog-shell h2 { margin: 3px 0 0; font: 800 32px Georgia, "Microsoft YaHei", serif; }
.dialog-heading { display: flex; justify-content: space-between; align-items: flex-start; }
.dialog-close { width: 38px; height: 38px; border: 0; border-radius: 50%; color: var(--ink-soft); background: rgba(21,60,54,.08); cursor: pointer; font-size: 25px; }
.report-grid { margin: 24px 0; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; }
.report-stat { padding: 16px; border-radius: 16px; background: var(--mint); }
.report-stat strong, .report-stat span { display: block; }
.report-stat strong { font: 800 28px Georgia, serif; }
.report-stat span { margin-top: 3px; color: var(--ink-soft); font-size: 11px; }
.report-section { margin-top: 18px; padding-top: 17px; border-top: 1px solid rgba(21,60,54,.12); }
.report-section h3 { margin: 0 0 8px; font-size: 15px; }
.report-section p, .report-section li { color: var(--ink-soft); font-size: 13px; line-height: 1.65; }
.mastery-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.mastery-tag { padding: 6px 9px; border-radius: 99px; color: var(--jade-dark); background: #e8f3e4; font-size: 12px; font-weight: 800; }
.dialog-actions { margin-top: 26px; display: flex; justify-content: space-between; gap: 12px; }
.celebration { animation: celebrate 650ms cubic-bezier(.2,.8,.2,1); }
@keyframes celebrate { 0% { transform: scale(.96); filter: saturate(.6); } 55% { transform: scale(1.02); filter: saturate(1.25); } 100% { transform: scale(1); filter: saturate(1); } }

@media (max-width: 980px) {
  .topbar { grid-template-columns: 1fr auto; }
  .progress-wrap { grid-column: 1 / -1; grid-row: 2; }
  .top-actions { grid-column: 2; grid-row: 1; }
  .game-layout { grid-template-columns: 1fr; }
  .story-panel { min-height: auto; }
  .scene, .scene > svg, .scene-svg { min-height: 430px; }
  .mission-panel { min-height: 520px; }
}

@media (max-width: 600px) {
  .app-shell { padding: 12px 10px 10px; }
  .topbar { gap: 12px; }
  .brand strong { font-size: 15px; }
  .brand small, .desktop-label { display: none; }
  .icon-button { width: 43px; padding: 8px; justify-content: center; }
  .game-layout { border-radius: 22px; }
  .story-panel { padding: 12px; }
  .world-chip { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .scene, .scene > svg, .scene-svg { min-height: 360px; }
  .scene-overlay { padding: 24px; }
  .mission-panel { min-height: 500px; padding: 26px 20px; }
  .report-grid { grid-template-columns: 1fr; }
  .dialog-actions { flex-direction: column-reverse; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}