* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0c;
  --panel: rgba(14,14,18,0.92);
  --bd: #1a1918;
  --text: #e0ded8;
  --muted: #8a8780;
  --faint: #5a5750;
  --accent: #c02020;
}

body {
  background: var(--bg); color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px; line-height: 1.5;
  min-height: 100dvh;
  display: flex; flex-direction: column;
  -webkit-tap-highlight-color: transparent;
}

header {
  padding: 16px 20px 8px;
}

.progress-bar {
  height: 3px; background: var(--bd); border-radius: 2px; overflow: hidden;
}
.progress-fill {
  height: 100%; background: var(--accent); width: 0%;
  transition: width 0.4s ease;
}
.header-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 8px;
}
.progress-text { font-size: 11px; color: var(--faint); letter-spacing: 0.5px; }
.pos { font-size: 11px; color: var(--faint); letter-spacing: 0.5px; }

main {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; padding: 12px 20px 24px;
  max-width: 480px; width: 100%; margin: 0 auto;
}

.card {
  text-align: center; padding: 20px 0 8px;
  width: 100%;
}
.char-display {
  font-size: 72px; line-height: 1.1;
  color: var(--text); margin-bottom: 8px;
}
.pinyin {
  font-size: 18px; color: var(--muted);
  letter-spacing: 0.5px; margin-bottom: 4px;
}
.meaning {
  font-size: 14px; color: var(--faint);
}

.writer-wrap {
  width: 100%; max-width: 320px;
  margin: 16px auto;
  position: relative;
}
#writer-target {
  width: 100%; aspect-ratio: 1;
  background: var(--panel); border: 1px solid var(--bd);
  border-radius: 8px; overflow: hidden;
}
#writer-target svg { display: block; width: 100% !important; height: 100% !important; }

.status {
  text-align: center; font-size: 12px;
  color: var(--muted); margin-top: 10px;
  min-height: 18px;
  transition: color 0.3s;
}
.status.success { color: var(--accent); }

.controls {
  display: flex; gap: 12px; width: 100%;
  max-width: 320px; margin: 4px auto 0;
}
.btn {
  flex: 1; padding: 14px 0;
  background: none; border: 1px solid var(--bd);
  color: var(--muted); font-family: inherit; font-size: 13px;
  letter-spacing: 1px; text-transform: uppercase;
  border-radius: 6px; cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn:hover, .btn:active { border-color: var(--faint); color: var(--text); }
.btn-accent { border-color: rgba(192,32,32,0.3); color: var(--accent); }
.btn-accent:hover, .btn-accent:active { border-color: var(--accent); }
.btn:disabled { opacity: 0.3; cursor: default; }

.nav-row {
  display: flex; gap: 12px; width: 100%;
  max-width: 320px; margin: 12px auto 0;
}
.btn-nav {
  flex: 1; padding: 12px 0;
  background: none; border: none;
  color: var(--faint); font-family: inherit; font-size: 12px;
  letter-spacing: 1px; cursor: pointer;
  transition: color 0.2s;
}
.btn-nav:hover { color: var(--text); }
.btn-nav:disabled { opacity: 0.2; cursor: default; }

@media (max-width: 380px) {
  .char-display { font-size: 56px; }
  .writer-wrap { max-width: 280px; }
  .controls, .nav-row { max-width: 280px; }
}