:root {
  --bg-top: #8fd3ff;
  --bg-bottom: #fff6bf;
  --panel: rgba(255, 255, 255, 0.88);
  --text: #33415c;
  --accent: #ff8a65;
  --accent-deep: #f55d3e;
  --blueberry: #6c8ef5;
  --mint: #7ad7c9;
  --shadow: 0 18px 40px rgba(72, 88, 129, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Baloo 2", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-top) 0%, #c9efff 38%, var(--bg-bottom) 100%);
  overflow-x: hidden;
}

button,
input,
select {
  font: inherit;
}

.sky,
.stars,
.hills {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.sky {
  background:
    radial-gradient(circle at 10% 15%, rgba(255, 255, 255, 0.6) 0 5%, transparent 5.5%),
    radial-gradient(circle at 26% 22%, rgba(255, 255, 255, 0.55) 0 4%, transparent 4.5%),
    radial-gradient(circle at 78% 16%, rgba(255, 255, 255, 0.7) 0 6%, transparent 6.5%),
    radial-gradient(circle at 85% 28%, rgba(255, 255, 255, 0.45) 0 4.5%, transparent 5%);
}

.stars {
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.95) 1px, transparent 1.8px),
    radial-gradient(circle, rgba(255, 255, 255, 0.8) 1px, transparent 1.8px);
  background-size: 120px 120px, 180px 180px;
  background-position: 0 0, 40px 60px;
  opacity: 0.5;
}

.hills-back {
  top: auto;
  height: 38vh;
  background:
    radial-gradient(circle at 20% 100%, #92dda6 0 26%, transparent 26.5%),
    radial-gradient(circle at 46% 100%, #79d592 0 28%, transparent 28.5%),
    radial-gradient(circle at 78% 100%, #a7e7ad 0 30%, transparent 30.5%);
}

.hills-front {
  top: auto;
  height: 28vh;
  background:
    radial-gradient(circle at 12% 100%, #56c271 0 26%, transparent 26.5%),
    radial-gradient(circle at 50% 100%, #4bb168 0 30%, transparent 30.5%),
    radial-gradient(circle at 84% 100%, #62cb7d 0 26%, transparent 26.5%);
}

.app-shell {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

.topbar,
.game-header,
.pager,
.result-actions,
.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar {
  margin-bottom: 20px;
  flex-wrap: nowrap;
}

.audio-cluster {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sound-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.sound-picker.compact {
  padding: 6px 8px;
  max-width: 118px;
}

#fullscreenToggle {
  font-size: 1.05rem;
  line-height: 1;
}

.sound-picker.compact span {
  display: none;
}

.sound-picker span {
  font-weight: 700;
  white-space: nowrap;
}

.sound-picker select {
  border: 0;
  background: transparent;
  min-width: 0;
  width: 100%;
}

.brand-badge {
  display: inline-flex;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  font-family: "ZCOOL KuaiLe", cursive;
  font-size: 1.15rem;
  box-shadow: var(--shadow);
}

.brand-icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
  cursor: pointer;
  color: #d18a1f;
}

.brand-icon-svg,
.close-icon-svg {
  width: 18px;
  height: 18px;
}

.brand p {
  margin: 8px 0 0;
}

.mute-btn,
.nav-btn,
.ghost-btn,
.start-btn,
.preset-btn {
  border: 0;
  border-radius: 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.mute-btn,
.nav-btn,
.ghost-btn,
.preset-btn {
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  box-shadow: var(--shadow);
}

.inline-btn {
  padding: 10px 14px;
}

.mute-icon-btn {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
  cursor: pointer;
  font-size: 1rem;
}

.start-btn {
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  color: white;
  box-shadow: 0 14px 24px rgba(245, 93, 62, 0.28);
  font-size: 1.1rem;
  font-weight: 700;
}

button:hover,
button:focus-visible {
  transform: translateY(-2px);
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(108, 142, 245, 0.35);
  outline-offset: 2px;
}

.panel {
  display: none;
  position: relative;
  background: var(--panel);
  backdrop-filter: blur(10px);
  border-radius: 28px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.panel.active {
  display: block;
}

.records-overlay {
  position: absolute;
  inset: 0;
  z-index: 4;
  padding: 96px 20px 24px;
  background: rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(8px);
  border-radius: 28px;
}

.records-card {
  position: relative;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 24px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.records-card .progress-header {
  position: relative;
  display: block;
  min-height: 40px;
  padding-right: 54px;
  margin-bottom: 10px;
}

.records-close-btn {
  position: absolute;
  top: 0;
  right: 0;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 10px;
  background: rgba(245, 247, 255, 0.98);
  box-shadow: var(--shadow);
  cursor: pointer;
  color: var(--text);
}

.panel-copy h1,
.result-hero h2 {
  margin: 0;
  font-family: "ZCOOL KuaiLe", cursive;
  font-size: clamp(2rem, 4vw, 3rem);
}

.setup-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.field,
.summary-card,
.mode-field {
  background: rgba(255, 255, 255, 0.96);
  border-radius: 22px;
  padding: 18px;
}

.field span,
.mode-field legend,
.mini-title {
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
}

.field select,
.count-field input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 2px solid rgba(108, 142, 245, 0.18);
  background: white;
}

.count-field small {
  display: block;
  margin-top: 8px;
  color: #6b7280;
}

.count-preset-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.count-preset-btn.active {
  background: linear-gradient(135deg, rgba(122, 215, 201, 0.92), rgba(108, 142, 245, 0.84));
  color: white;
}

.grade-button-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.grade-btn {
  min-height: 58px;
  padding: 12px 14px;
  border: 0;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
  cursor: pointer;
  font-weight: 700;
  color: var(--text);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.grade-btn.active {
  background: linear-gradient(135deg, rgba(122, 215, 201, 0.92), rgba(108, 142, 245, 0.84));
  color: white;
}

.summary-card,
.progress-card,
.mode-launch {
  grid-column: 1 / -1;
}

.mode-launch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.mode-launch-btn {
  min-height: 64px;
}

.mode-secondary-btn {
  background: linear-gradient(135deg, #ff9a76 0%, #ff6b57 100%);
  color: white;
  box-shadow: 0 14px 24px rgba(245, 93, 62, 0.22);
}

.mode-launch-btn:disabled {
  background: linear-gradient(135deg, rgba(230, 236, 245, 0.95), rgba(244, 247, 252, 0.95));
  color: #93a1b5;
  box-shadow: none;
  cursor: not-allowed;
  opacity: 1;
}

.preview-screen {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.preview-mode .panel-copy {
  margin-bottom: 8px;
}

.preview-actions {
  display: flex;
  gap: 14px;
  justify-content: flex-end;
}

.summary-card {
  display: grid;
  gap: 8px;
  min-height: 112px;
  background:
    linear-gradient(135deg, rgba(255, 209, 102, 0.35), rgba(122, 215, 201, 0.25)),
    rgba(255, 255, 255, 0.96);
}

.summary-meta,
.pill-group,
.progress-columns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.progress-columns > div {
  flex: 1 1 320px;
}

.summary-chip,
.pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 0 0 1px rgba(108, 142, 245, 0.12);
  white-space: nowrap;
}

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

.hidden,
.records-screen.hidden,
.wrong-book-panel.hidden,
.detail-panel.hidden,
.countdown-overlay.hidden {
  display: none;
}

.timer-card {
  min-width: 148px;
  padding: 14px 18px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(108, 142, 245, 0.18), rgba(255, 179, 198, 0.22));
  text-align: center;
}

.timer-card strong {
  display: block;
  font-size: 2rem;
  color: var(--blueberry);
}

.timer-card .timer-warning {
  color: #e63946;
  text-shadow: 0 0 14px rgba(230, 57, 70, 0.28);
  animation: pulse-warning 0.9s ease-in-out infinite;
}

.question-wrap {
  position: relative;
  min-height: 70vh;
  max-height: 72vh;
  overflow-y: auto;
  padding: 24px 16px;
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(251, 255, 243, 0.95));
  scroll-behavior: smooth;
}

.question-wrap.single-mode {
  min-height: auto;
  max-height: none;
  padding: 12px 16px 10px;
}

.kid-keypad {
  margin-top: 18px;
  padding: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.question-wrap.single-mode + .kid-keypad {
  margin-top: 10px;
}

.kid-keypad-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.kid-keypad-header span {
  color: #667085;
}

.keypad-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.keypad-btn {
  min-height: 58px;
  border: 0;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.96));
  box-shadow: var(--shadow);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
}

.keypad-action {
  background: linear-gradient(135deg, rgba(255, 232, 205, 0.98), rgba(255, 245, 226, 0.98));
  font-size: 1rem;
}

.keypad-tall {
  grid-row: span 2;
  min-height: 126px;
}

.keypad-enter {
  background: linear-gradient(135deg, rgba(122, 215, 201, 0.92), rgba(108, 142, 245, 0.84));
  color: white;
}

.question-list {
  display: grid;
  gap: 16px;
}

.question-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 18px;
  border-radius: 20px;
  background: #fef7f3;
  box-shadow: inset 0 0 0 2px rgba(255, 138, 101, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.question-card.active {
  transform: scale(1.01);
  background: linear-gradient(135deg, rgba(255, 248, 200, 0.95), rgba(227, 248, 255, 0.95));
  box-shadow: 0 16px 30px rgba(108, 142, 245, 0.16);
}

.question-index {
  inline-size: 52px;
  block-size: 52px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(122, 215, 201, 0.45), rgba(108, 142, 245, 0.28));
  font-weight: 700;
}

.question-index-shell {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.question-nav-btn {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(108, 142, 245, 0.08);
  color: rgba(57, 78, 128, 0.55);
  cursor: pointer;
}

.question-nav-btn svg {
  width: 16px;
  height: 16px;
}

.question-nav-btn:disabled {
  opacity: 0.32;
  cursor: default;
}

.question-main {
  display: grid;
  gap: 6px;
}

.question-no {
  color: #667085;
  font-size: 0.95rem;
}

.question-text {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.answer-input {
  width: min(220px, 34vw);
  padding: 12px 16px;
  border-radius: 16px;
  border: 2px solid rgba(108, 142, 245, 0.2);
  text-align: center;
  font-size: 1.35rem;
  background: white;
}

.pager {
  margin-top: 20px;
}

.pager-tip {
  padding: 0 12px;
  text-align: center;
  color: #5f6c7b;
}

.summary-note {
  color: #5f6c7b;
  font-size: 0.98rem;
}

.countdown-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.65);
  border-radius: 26px;
  z-index: 2;
}

.countdown-bubble {
  width: 210px;
  height: 210px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 30% 30%, #fff9b3, #ffb56b);
  box-shadow: 0 16px 30px rgba(255, 181, 107, 0.35);
}

.countdown-bubble strong {
  font-size: 4.5rem;
  font-family: "ZCOOL KuaiLe", cursive;
}

.result-hero {
  text-align: center;
}

.score-badge {
  margin: 24px auto 0;
  width: min(240px, 100%);
  padding: 18px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(255, 209, 102, 0.52), rgba(255, 179, 198, 0.45));
}

.score-badge strong {
  display: block;
  margin-top: 6px;
  font-size: 3.4rem;
  color: var(--accent-deep);
}

.detail-panel {
  margin-top: 22px;
  padding: 22px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.8);
}

.detail-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.detail-item {
  display: grid;
  grid-template-columns: 130px 1fr 220px 220px;
  align-items: center;
  gap: 12px 18px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #fff8f0;
}

.detail-number {
  font-weight: 700;
  color: var(--blueberry);
}

.detail-answer {
  color: #667085;
}

.detail-status.correct {
  color: #169873;
}

.detail-status.wrong {
  color: #d9485f;
}

.detail-status.skipped {
  color: #6b7280;
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes pulse-warning {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
}

@media (max-width: 820px) {
  .setup-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
  }

  .audio-cluster {
    flex-direction: row;
    align-items: center;
    gap: 8px;
  }

  .sound-picker.compact {
    max-width: 104px;
  }

  .game-header,
  .pager,
  .result-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .question-card {
    grid-template-columns: 1fr;
  }

  .question-index,
  .answer-input {
    justify-self: center;
  }

  .answer-input {
    width: 100%;
  }

  .detail-item {
    grid-template-columns: 1fr;
  }

  .question-wrap {
    min-height: 64vh;
    max-height: 64vh;
    padding: 18px 12px;
  }

  .question-wrap.single-mode {
    min-height: auto;
    max-height: none;
    padding: 10px 12px 8px;
  }

  .question-wrap.single-mode + .kid-keypad {
    margin-top: 8px;
  }

  .grade-button-grid,
  .keypad-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .count-preset-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .records-card {
    padding: 16px;
  }

  .records-card .progress-header {
    min-height: 36px;
    padding-right: 48px;
  }

  .records-close-btn {
    top: 0;
    right: 0;
  }

  .progress-columns {
    flex-direction: column;
  }

  .mode-launch,
  .preview-actions {
    grid-template-columns: 1fr;
    display: grid;
  }

  .panel-copy p.hidden {
    display: none;
  }
}

@media (max-width: 820px) and (orientation: portrait) {
  .app-shell {
    padding: 18px 14px 32px;
  }

  #fullscreenToggle:not(.hidden) {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0px) + 14px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 40;
    box-shadow: 0 12px 28px rgba(42, 74, 118, 0.18);
  }

  .topbar .brand p,
  #setupScreen .panel-copy p {
    display: none;
  }

  .game-header {
    gap: 10px;
    margin-bottom: 10px;
  }

  .pill-group {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    width: 100%;
  }

  .pill {
    justify-content: center;
    padding: 7px 10px;
    font-size: 0.95rem;
  }

  .timer-card {
    min-width: auto;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 18px;
  }

  .timer-card span {
    font-size: 0.95rem;
  }

  .timer-card strong {
    display: inline-block;
    font-size: 1.75rem;
  }

  .question-wrap.single-mode {
    padding: 8px 8px 6px;
    border-radius: 22px;
  }

  .question-wrap.single-mode .question-list {
    gap: 10px;
  }

  .question-wrap.single-mode .question-card {
    padding: 14px;
    gap: 10px;
  }

  .question-wrap.single-mode .question-main {
    gap: 8px;
  }

  .question-wrap.single-mode .question-no {
    display: none;
  }

  .question-wrap.single-mode .question-index-shell {
    justify-content: center;
    gap: 10px;
  }

  .question-wrap.single-mode .question-nav-btn {
    width: 28px;
    height: 28px;
    background: rgba(108, 142, 245, 0.1);
  }

  .question-wrap.single-mode .question-text {
    font-size: 2rem;
  }

  .question-wrap.single-mode .answer-input {
    min-height: 68px;
    font-size: 1.55rem;
  }

  .question-wrap.single-mode .answer-input.custom-keypad-input {
    caret-color: transparent;
  }

  .question-wrap.single-mode + .kid-keypad {
    margin-top: 8px;
    padding: 14px;
    border-radius: 20px;
  }

  .kid-keypad-header {
    margin-bottom: 10px;
  }

  .kid-keypad-header span {
    display: none;
  }

  .keypad-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }

  .keypad-btn {
    min-height: 48px;
    border-radius: 14px;
    font-size: 1rem;
  }

  .keypad-action {
    font-size: 0.92rem;
  }
}