:root {
  --ink: #17233a;
  --muted: #506174;
  --paper: #fff8dd;
  --panel: #ffffff;
  --line: #d4dfec;
  --sky: #8ed8ff;
  --grass: #35aa5d;
  --grass-dark: #187043;
  --brick: #c56a3e;
  --brick-dark: #8f4528;
  --coin: #ffd34d;
  --coin-dark: #d99b18;
  --coral: #ec5d4f;
  --blue: #2f77c8;
  --purple: #7351b8;
  --shadow: 0 16px 32px rgba(23, 35, 58, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    linear-gradient(180deg, rgba(142, 216, 255, 0.42), rgba(255, 248, 221, 0.96)),
    #fff8dd;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  font-family: "Segoe UI", "Noto Sans TC", Arial, sans-serif;
  letter-spacing: 0;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

rt {
  color: #26394f;
  font-size: 0.76em;
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.15;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -42px;
  z-index: 20;
  padding: 8px 12px;
  color: #ffffff;
  background: var(--ink);
  border-radius: 6px;
  transition: top 0.2s ease;
}

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

.app-header {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
  gap: 26px;
  align-items: center;
  min-height: 330px;
  padding: 30px clamp(18px, 4vw, 56px) 26px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.68), rgba(255, 255, 255, 0.15)),
    linear-gradient(180deg, #8ed8ff 0%, #dff7ff 56%, #fff2b7 100%);
  border-bottom: 10px solid var(--grass);
}

.app-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 34px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.18) 0 12px, transparent 12px 24px),
    linear-gradient(180deg, var(--brick), var(--brick-dark));
  background-size: 48px 34px, auto;
  border-top: 4px solid rgba(255, 255, 255, 0.45);
}

.platform-cloud {
  position: absolute;
  width: 126px;
  height: 42px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow:
    34px -18px 0 4px rgba(255, 255, 255, 0.82),
    72px -4px 0 0 rgba(255, 255, 255, 0.82);
}

.cloud-a {
  top: 54px;
  right: 38%;
}

.cloud-b {
  top: 118px;
  right: 10%;
  transform: scale(0.72);
}

.coin-row {
  position: absolute;
  left: min(760px, 57vw);
  top: 58px;
  display: flex;
  gap: 16px;
}

.coin-row span,
.world-coin {
  display: block;
  width: 34px;
  height: 34px;
  border: 4px solid var(--coin-dark);
  border-radius: 999px;
  background: radial-gradient(circle at 35% 30%, #fff2a6 0 18%, var(--coin) 19% 100%);
  box-shadow: inset -4px -5px 0 rgba(217, 155, 24, 0.32);
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--grass-dark);
  font-size: 0.84rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  max-width: 100%;
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: clamp(2.2rem, 6vw, 5.1rem);
  line-height: 0.96;
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  min-width: 0;
  margin: 16px 0 22px;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-weight: 800;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-tab,
.icon-button,
.card-actions button,
.round-button,
.mini-speak {
  border: 0;
  border-radius: 8px;
  color: var(--ink);
  background: #ffffff;
  box-shadow: inset 0 0 0 2px var(--line);
}

.mode-tab,
.icon-button,
.card-actions button {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 15px;
  font-weight: 900;
}

.mode-tab.active,
.card-actions button:nth-child(2),
.icon-button:hover,
.mode-tab:hover {
  color: #ffffff;
  background: var(--grass);
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.18);
}

.button-icon,
.speaker-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  background: currentColor;
  clip-path: polygon(0 35%, 35% 35%, 70% 5%, 70% 95%, 35% 65%, 0 65%);
}

.button-icon.trophy {
  clip-path: polygon(22% 10%, 78% 10%, 78% 30%, 92% 30%, 92% 58%, 70% 58%, 62% 78%, 75% 78%, 75% 92%, 25% 92%, 25% 78%, 38% 78%, 30% 58%, 8% 58%, 8% 30%, 22% 30%);
}

.button-icon.shuffle {
  clip-path: polygon(0 24%, 45% 24%, 62% 40%, 78% 24%, 64% 24%, 64% 10%, 100% 31%, 64% 52%, 64% 38%, 50% 52%, 40% 42%, 0 42%, 0 24%, 0 62%, 38% 62%, 48% 52%, 58% 62%, 64% 62%, 64% 48%, 100% 69%, 64% 90%, 64% 76%, 52% 76%, 40% 64%, 0 80%);
}

.speaker-icon::after {
  content: "";
  display: block;
  width: 12px;
  height: 18px;
  margin-left: 12px;
  border: 2px solid currentColor;
  border-left: 0;
  border-radius: 0 18px 18px 0;
  transform: translateY(-1px);
}

.speaker-icon.small,
.speaker-icon.mini {
  width: 16px;
  height: 16px;
}

.speaker-icon.mini::after {
  width: 9px;
  height: 14px;
  margin-left: 10px;
}

.hero-art {
  position: relative;
  z-index: 1;
  min-height: 250px;
  display: flex;
  align-items: end;
  justify-content: center;
}

.hero-art img {
  width: min(100%, 450px);
  max-height: 306px;
  object-fit: contain;
  filter: drop-shadow(0 20px 18px rgba(23, 35, 58, 0.18));
}

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
  width: min(1180px, calc(100% - 32px));
  margin: 18px auto 38px;
}

.side-panel,
.word-card,
.exam-card {
  border: 2px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.side-panel {
  align-self: start;
  padding: 16px;
}

.world-map {
  width: 100%;
  aspect-ratio: 1.26;
  object-fit: contain;
  border-radius: 8px;
  background: var(--sky);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 14px 0;
}

.stat-grid div {
  min-height: 76px;
  padding: 10px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.stat-grid strong {
  display: block;
  color: var(--blue);
  font-size: 1.7rem;
  line-height: 1;
}

.stat-grid span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 900;
}

.audio-panel h2 {
  margin: 16px 0 10px;
  font-size: 1.05rem;
}

.audio-panel label,
.toolbar label span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-weight: 900;
}

.audio-panel select,
.audio-panel audio,
.toolbar input,
.toolbar select {
  width: 100%;
}

.audio-panel select,
.toolbar input,
.toolbar select {
  height: 42px;
  border: 2px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  color: var(--ink);
  background: #ffffff;
}

.audio-panel audio {
  margin-top: 12px;
}

.workspace {
  min-width: 0;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(160px, 1.3fr) minmax(130px, 0.7fr) minmax(150px, 0.8fr) auto;
  gap: 10px;
  align-items: end;
  margin-bottom: 14px;
}

.mode-view {
  display: none;
}

.mode-view.active {
  display: block;
}

.word-card,
.exam-card {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 3vw, 28px);
}

.word-card::before,
.exam-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background:
    linear-gradient(90deg, var(--brick) 0 46px, var(--brick-dark) 46px 48px);
  background-size: 48px 8px;
}

.card-topline,
.exam-header,
.word-main,
.card-actions,
.exam-controls {
  display: flex;
  gap: 10px;
  align-items: center;
}

.card-topline {
  flex-wrap: wrap;
  margin-top: 4px;
}

.pill,
.score-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--ink);
  background: #e9f7ff;
  font-weight: 900;
  font-size: 0.84rem;
}

.pill.level {
  background: #ffecaa;
}

.pill.star {
  color: #6d4500;
  background: #ffe28a;
}

.hidden {
  display: none;
}

.word-main {
  justify-content: space-between;
  margin: 18px 0;
}

.card-label {
  margin: 0 0 4px;
  color: var(--grass-dark);
  font-weight: 900;
}

.word-main h2,
.exam-header h2 {
  margin: 0;
}

#wordText {
  font-size: clamp(3.1rem, 10vw, 7rem);
  line-height: 0.95;
  word-break: break-word;
}

.pos {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 1.1rem;
  font-weight: 900;
}

.round-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  flex: 0 0 72px;
  color: #ffffff;
  background: var(--coral);
  box-shadow: inset 0 -5px 0 rgba(0, 0, 0, 0.16);
}

.meaning-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.meaning-grid section,
.example-box,
.exam-hint {
  min-height: 112px;
  padding: 14px;
  border: 2px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.section-heading {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.section-heading h3,
.exam-hint h3 {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.speak-pair {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.mini-speak {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 7px 10px;
  color: #ffffff;
  background: var(--blue);
  font-weight: 900;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.16);
}

.mini-speak.zh {
  background: var(--grass);
}

.mini-speak:hover {
  transform: translateY(-1px);
}

.meaning-grid p,
.example-box p,
.exam-hint p {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.6;
}

.example-box {
  margin-top: 12px;
  background: #fff7d8;
}

.example-box.muted {
  background: #edf9ee;
}

.zh-hint {
  margin-top: 12px !important;
  color: var(--muted);
  font-size: 0.98rem !important;
  font-weight: 800;
}

.letter-strip,
.letter-bank,
.answer-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.letter-strip span,
.letter-tile,
.answer-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 52px;
  border-radius: 8px;
  font-size: 1.3rem;
  font-weight: 900;
}

.letter-strip span {
  color: var(--ink);
  background: #f3f7ff;
  border: 2px solid #cbd8ee;
}

.card-actions {
  flex-wrap: wrap;
  margin-top: 18px;
}

.exam-header {
  justify-content: space-between;
}

.score-pill {
  color: #ffffff;
  background: var(--purple);
  font-size: 1.1rem;
}

.exam-note {
  margin: 8px 0 16px;
  color: var(--muted);
  line-height: 1.7;
  font-weight: 800;
}

.exam-controls {
  flex-wrap: wrap;
}

.answer-slots {
  min-height: 62px;
}

.answer-slot {
  border: 2px dashed #9ab1cd;
  color: var(--ink);
  background: #ffffff;
}

.letter-bank {
  min-height: 64px;
}

.letter-tile {
  border: 0;
  color: #ffffff;
  background: var(--blue);
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.16);
}

.letter-tile:disabled {
  color: #7b8793;
  background: #e6ebf1;
  box-shadow: none;
  cursor: not-allowed;
}

.feedback {
  min-height: 42px;
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--muted);
  background: #f6f8fb;
  font-weight: 900;
}

.feedback.good {
  color: #0d513b;
  background: #dff7e7;
}

.feedback.warn {
  color: #7b3e00;
  background: #fff0cf;
}

.exam-hint {
  margin-top: 14px;
  min-height: auto;
}

#selfTestResult {
  position: fixed;
  right: 8px;
  bottom: 8px;
  z-index: 50;
  padding: 4px 8px;
  color: #ffffff;
  background: var(--grass-dark);
  border-radius: 6px;
  font-weight: 900;
}

@media (max-width: 900px) {
  .app-header,
  .layout {
    grid-template-columns: 1fr;
  }

  .app-header {
    min-height: auto;
  }

  .hero-art {
    min-height: 180px;
  }

  .layout {
    width: min(100% - 22px, 720px);
  }

  .toolbar {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .app-header {
    padding: 22px 12px 42px;
  }

  .coin-row,
  .platform-cloud {
    display: none;
  }

  .hero-actions,
  .card-actions,
  .exam-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .mode-tab,
  .icon-button,
  .card-actions button {
    width: 100%;
  }

  .toolbar,
  .meaning-grid {
    grid-template-columns: 1fr;
  }

  .word-main {
    align-items: flex-start;
  }

  .round-button {
    width: 62px;
    height: 62px;
    flex-basis: 62px;
  }

  #wordText {
    font-size: 3.2rem;
  }

  h1 {
    font-size: 2rem;
    line-height: 1.05;
  }

  .hero-note {
    display: block;
    line-height: 1.6;
  }

  .hero-note span {
    display: block;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .speak-pair {
    width: 100%;
    justify-content: flex-start;
  }

  .letter-strip span,
  .letter-tile,
  .answer-slot {
    width: 42px;
    height: 48px;
  }
}