:root {
  --bg: #100909;
  --bg-soft: #180f0d;
  --panel: #211614;
  --panel-2: #2b1b17;
  --paper: #f6e8c9;
  --paper-dim: #cbb894;
  --red: #c9362c;
  --red-soft: rgba(201, 54, 44, 0.18);
  --gold: #d8a84f;
  --gold-soft: rgba(216, 168, 79, 0.18);
  --jade: #4fb286;
  --jade-soft: rgba(79, 178, 134, 0.18);
  --muted: #9a8872;
  --error: #ff6767;
  --shadow: rgba(0, 0, 0, 0.35);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --transition: 170ms ease;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(201, 54, 44, 0.18), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(216, 168, 79, 0.12), transparent 30rem),
    var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--paper);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.025), transparent),
    var(--bg);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), transparent),
    var(--panel);
  border-right: 1px solid rgba(246, 232, 201, 0.08);
  box-shadow: 18px 0 40px rgba(0, 0, 0, 0.22);
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  color: var(--paper);
  font-size: 30px;
  font-weight: 900;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.18), transparent 45%),
    linear-gradient(135deg, var(--red), #8b1d18);
  box-shadow:
    0 16px 28px rgba(201, 54, 44, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.15);
}

.brand h1 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.panel-section {
  margin-bottom: 28px;
}

.panel-section h2 {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

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

.option-button {
  border: 1px solid rgba(246, 232, 201, 0.11);
  border-radius: 14px;
  padding: 12px 10px;
  color: var(--paper-dim);
  background: rgba(255, 255, 255, 0.035);
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    color var(--transition);
}

.option-button:hover {
  transform: translateY(-1px);
  border-color: rgba(216, 168, 79, 0.35);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.055);
}

.option-button.active {
  border-color: rgba(216, 168, 79, 0.6);
  color: var(--paper);
  background:
    linear-gradient(135deg, rgba(216, 168, 79, 0.22), rgba(201, 54, 44, 0.14));
  box-shadow: 0 10px 24px rgba(216, 168, 79, 0.08);
}

.select {
  width: 100%;
  border: 1px solid rgba(246, 232, 201, 0.11);
  border-radius: 14px;
  padding: 13px 14px;
  color: var(--paper);
  background: #1a100f;
  outline: none;
}

.muted-section {
  opacity: 0.85;
}

.mini-list {
  display: grid;
  gap: 9px;
}

.mini-list span {
  padding: 10px 12px;
  border: 1px dashed rgba(246, 232, 201, 0.12);
  border-radius: 12px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
}

.main {
  min-width: 0;
  padding: 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.topbar-title {
  display: flex;
  align-items: center;
  gap: 13px;
}

.seal {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  color: var(--bg);
  font-weight: 900;
  background: var(--gold);
  box-shadow: 0 12px 28px rgba(216, 168, 79, 0.22);
}

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

.topbar-title small {
  display: block;
  margin-top: 3px;
  color: var(--muted);
}

.mobile-menu-button {
  display: none;
  border: 1px solid rgba(246, 232, 201, 0.14);
  border-radius: 12px;
  padding: 10px 13px;
  color: var(--paper);
  background: rgba(255, 255, 255, 0.04);
}

.restart-button {
  border: 1px solid rgba(216, 168, 79, 0.35);
  border-radius: 14px;
  padding: 11px 16px;
  color: var(--paper);
  background:
    linear-gradient(135deg, rgba(216, 168, 79, 0.18), rgba(201, 54, 44, 0.14));
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition);
}

.restart-button:hover {
  transform: translateY(-1px);
  border-color: rgba(216, 168, 79, 0.7);
  background:
    linear-gradient(135deg, rgba(216, 168, 79, 0.26), rgba(201, 54, 44, 0.2));
}

.restart-button.large {
  padding: 14px 18px;
  font-weight: 800;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.stat-card {
  min-height: 92px;
  padding: 18px;
  border: 1px solid rgba(246, 232, 201, 0.09);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.02)),
    var(--panel);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

.stat-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.stat-card strong {
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  line-height: 1;
}

.typing-stage {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid rgba(246, 232, 201, 0.1);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 50% 0%, rgba(216, 168, 79, 0.1), transparent 34rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.018)),
    var(--bg-soft);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.28),
    inset 0 0 0 1px rgba(255, 255, 255, 0.025);
}

.stage-glow {
  position: absolute;
  inset: auto -10% -42% -10%;
  height: 340px;
  pointer-events: none;
  background:
    radial-gradient(circle, rgba(201, 54, 44, 0.17), transparent 58%),
    radial-gradient(circle, rgba(216, 168, 79, 0.11), transparent 48%);
  filter: blur(14px);
}

.instruction-box {
  position: relative;
  z-index: 1;
  display: inline-flex;
  max-width: 100%;
  margin-bottom: 28px;
  padding: 12px 15px;
  border: 1px solid rgba(216, 168, 79, 0.2);
  border-radius: 999px;
  color: var(--paper-dim);
  background: rgba(0, 0, 0, 0.18);
  font-size: 0.92rem;
}

.instruction-box strong {
  color: var(--gold);
}

.word-stream {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-content: flex-start;
  min-height: 250px;
  margin-bottom: 30px;
}

.word-card {
  position: relative;
  width: min(160px, calc(50vw - 38px));
  min-height: 112px;
  padding: 13px 12px 12px;
  border: 1px solid rgba(246, 232, 201, 0.085);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    opacity var(--transition);
}

.word-card.active {
  transform: translateY(-3px);
  border-color: rgba(216, 168, 79, 0.62);
  background:
    linear-gradient(180deg, rgba(216, 168, 79, 0.13), rgba(255, 255, 255, 0.035));
  box-shadow:
    0 18px 34px rgba(0, 0, 0, 0.2),
    0 0 0 4px rgba(216, 168, 79, 0.05);
}

.word-card.done {
  opacity: 0.48;
}

.word-card.correct {
  border-color: rgba(79, 178, 134, 0.35);
}

.word-card.wrong {
  border-color: rgba(255, 103, 103, 0.45);
  background: rgba(255, 103, 103, 0.065);
}

.hanzi-line {
  min-height: 34px;
  color: var(--paper);
  font-size: 1.6rem;
  font-weight: 800;
  text-align: center;
  letter-spacing: 0.08em;
}

.pinyin-line {
  min-height: 26px;
  margin-top: 6px;
  color: var(--gold);
  font-size: 1.05rem;
  font-weight: 700;
  text-align: center;
}

.english-line {
  min-height: 20px;
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.84rem;
  text-align: center;
}

.char.correct-char {
  color: var(--jade);
  text-shadow: 0 0 16px rgba(79, 178, 134, 0.34);
}

.char.wrong-char {
  color: var(--error);
  text-shadow: 0 0 14px rgba(255, 103, 103, 0.26);
}

.char.current-char {
  position: relative;
  color: var(--paper);
}

.char.current-char::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  border-radius: 999px;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(216, 168, 79, 0.7);
}

.input-wrap {
  position: relative;
  z-index: 1;
}

.typing-input {
  width: 100%;
  border: 0;
  border-radius: 18px;
  padding: 20px 22px;
  color: var(--paper);
  background: rgba(0, 0, 0, 0.22);
  outline: none;
  font-size: clamp(1.15rem, 3vw, 1.55rem);
  box-shadow:
    inset 0 0 0 1px rgba(246, 232, 201, 0.12),
    0 16px 34px rgba(0, 0, 0, 0.18);
}

.typing-input:focus {
  box-shadow:
    inset 0 0 0 1px rgba(216, 168, 79, 0.46),
    0 16px 34px rgba(0, 0, 0, 0.18),
    0 0 0 4px rgba(216, 168, 79, 0.07);
}

.typing-input:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.input-underline {
  height: 3px;
  width: 0;
  margin: 8px auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--red), var(--gold), var(--jade));
  transition: width var(--transition);
}

.typing-input:focus + .input-underline {
  width: 96%;
}

.current-hint {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
  text-align: center;
}

.result-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 22px;
  padding: 22px;
  border: 1px solid rgba(216, 168, 79, 0.24);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(216, 168, 79, 0.13), rgba(201, 54, 44, 0.1)),
    var(--panel);
}

.result-panel h2 {
  margin: 0 0 6px;
}

.result-panel p {
  margin: 0;
  color: var(--paper-dim);
}

.hidden {
  display: none;
}

.sidebar-backdrop {
  display: none;
}

@keyframes wrongShake {
  0%, 100% {
    transform: translateX(0);
  }

  30% {
    transform: translateX(-4px);
  }

  60% {
    transform: translateX(4px);
  }
}

.shake {
  animation: wrongShake 160ms ease;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(330px, 86vw);
    transform: translateX(-105%);
    transition: transform 220ms ease;
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    display: block;
    pointer-events: none;
    opacity: 0;
    background: rgba(0, 0, 0, 0.58);
    transition: opacity 220ms ease;
    z-index: 10;
  }

  body.sidebar-open .sidebar-backdrop {
    pointer-events: auto;
    opacity: 1;
  }

  .mobile-menu-button {
    display: inline-flex;
  }

  .main {
    padding: 18px;
  }

  .topbar {
    align-items: center;
  }

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

  .typing-stage {
    min-height: 500px;
  }

  .instruction-box {
    border-radius: 16px;
  }
}

@media (max-width: 620px) {
  .main {
    padding: 14px;
  }

  .topbar {
    gap: 10px;
  }

  .topbar-title {
    min-width: 0;
  }

  .topbar-title small {
    max-width: 190px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .restart-button {
    padding: 10px 12px;
  }

  .stats-grid {
    gap: 10px;
  }

  .stat-card {
    min-height: 80px;
    padding: 14px;
  }

  .typing-stage {
    padding: 18px;
    border-radius: 22px;
  }

  .word-stream {
    gap: 10px;
  }

  .word-card {
    width: calc(50% - 5px);
    min-height: 108px;
    padding: 11px 9px;
  }

  .hanzi-line {
    font-size: 1.38rem;
  }

  .pinyin-line {
    font-size: 0.98rem;
  }

  .english-line {
    font-size: 0.78rem;
  }

  .result-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .result-panel .restart-button {
    width: 100%;
  }
}





.hidden-control {
  display: none;
}

body.story-practice #timeSection {
  display: none;
}

body.story-practice #storyLevelSection {
  display: block;
}

body.random-practice #storyLevelSection {
  display: none;
}

.story-title-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 10px 13px;
  border: 1px solid rgba(216, 168, 79, 0.2);
  border-radius: 999px;
  color: var(--gold);
  background: rgba(216, 168, 79, 0.08);
  font-size: 0.9rem;
  font-weight: 800;
}








body.mistakes-practice #timeSection {
  display: none;
}

body.mistakes-practice #storyLevelSection {
  display: none;
}

.side-note {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.side-note strong {
  color: var(--gold);
}

.subtle-button {
  width: 100%;
  border: 1px solid rgba(246, 232, 201, 0.11);
  border-radius: 14px;
  padding: 11px 12px;
  color: var(--paper-dim);
  background: rgba(255, 255, 255, 0.035);
  transition:
    transform var(--transition),
    border-color var(--transition),
    color var(--transition),
    background var(--transition);
}

.subtle-button:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 103, 103, 0.38);
  color: var(--paper);
  background: rgba(255, 103, 103, 0.08);
}

.empty-state {
  width: 100%;
  padding: 28px;
  border: 1px dashed rgba(216, 168, 79, 0.25);
  border-radius: 22px;
  color: var(--paper-dim);
  background: rgba(255, 255, 255, 0.025);
  text-align: center;
}

.empty-state strong {
  display: block;
  margin-bottom: 8px;
  color: var(--gold);
  font-size: 1.15rem;
}






.line-hidden {
  color: rgba(246, 232, 201, 0.24);
  font-style: italic;
  letter-spacing: 0.04em;
}

.prompt-primary {
  color: var(--paper);
  font-size: 1.05rem;
  font-weight: 900;
}

.reveal-badge {
  display: inline-flex;
  align-items: center;
  margin-left: 6px;
  padding: 2px 7px;
  border: 1px solid rgba(216, 168, 79, 0.2);
  border-radius: 999px;
  color: var(--gold);
  background: rgba(216, 168, 79, 0.08);
  font-size: 0.72rem;
  font-weight: 800;
}







.tone-syllable {
  display: inline-block;
  margin-inline: 1px;
  transition:
    color var(--transition),
    text-shadow var(--transition),
    transform var(--transition);
}

.word-card.active .tone-syllable {
  transform: translateY(-1px);
}

.tone-1 {
  color: #f1c86a;
  text-shadow: 0 0 14px rgba(241, 200, 106, 0.22);
}

.tone-2 {
  color: #67d39b;
  text-shadow: 0 0 14px rgba(103, 211, 155, 0.2);
}

.tone-3 {
  color: #7fb7ff;
  text-shadow: 0 0 14px rgba(127, 183, 255, 0.2);
}

.tone-4 {
  color: #ff7a70;
  text-shadow: 0 0 14px rgba(255, 122, 112, 0.22);
}

.tone-0 {
  color: var(--paper-dim);
  text-shadow: none;
}

.infinity-mark {
  color: var(--gold);
  font-weight: 900;
}