:root {
  color-scheme: light;
  --bg: #f6f1e7;
  --ink: #1c1612;
  --muted: #6f655b;
  --faint: #a3988c;
  --line: #e3d7c6;
  --card: #fffaf3;
  --accent: #b8432f;
  --accent-ink: #fffaf3;
  --good: #2f6b4f;
  --shadow: 0 10px 30px rgba(60, 36, 16, 0.06);
  --nav: 4.6rem;
  --serif: Palatino, "Palatino Linotype", "Iowan Old Style", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", sans-serif;
  --han: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #14110e;
    --ink: #f4ecdf;
    --muted: #b7ab9e;
    --faint: #8c8174;
    --line: #2e2822;
    --card: #211c17;
    --accent: #e07a64;
    --accent-ink: #1c1612;
    --good: #8dccab;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
}

button, input, select, textarea { font: inherit; color: inherit; }

button { cursor: pointer; }

#app {
  max-width: 40rem;
  margin: 0 auto;
  min-height: 100dvh;
  padding: calc(1rem + env(safe-area-inset-top)) 1rem calc(var(--nav) + env(safe-area-inset-bottom) + 1.25rem);
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1rem;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0.15rem 0 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.7rem;
}

.quiet { color: var(--muted); font-size: 0.92rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.prompt {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 6vw, 2.35rem);
  line-height: 1.25;
  margin: 0.4rem 0 0;
}

.pinyin {
  font-family: var(--serif);
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.15;
  margin: 0.8rem 0 0.2rem;
}

.hanzi {
  font-family: var(--han);
  font-size: 1.35rem;
  color: var(--muted);
  margin: 0;
}

.note { margin: 0.9rem 0 0; line-height: 1.45; }

.row { display: flex; gap: 0.6rem; margin-top: 1rem; }

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 0.85rem 1rem;
  min-height: 3rem;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn.grow { flex: 1; }

.btn.good { border-color: var(--good); color: var(--good); }

.stack { display: flex; flex-direction: column; gap: 0.75rem; }

label { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 0.3rem; }

input[type="text"], input[type="password"], select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 0.9rem;
  padding: 0.85rem 0.9rem;
  min-height: 3rem;
}

textarea { min-height: 5.5rem; resize: vertical; }

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0; }

.chip {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  color: var(--muted);
}

.chip.on { color: var(--ink); border-color: var(--ink); }

.list { display: flex; flex-direction: column; gap: 0.55rem; }

.item {
  text-align: left;
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 1rem;
  padding: 0.85rem 0.95rem;
}

.item strong { display: block; font-weight: 600; }
.item .pinyin-sm { font-family: var(--serif); font-size: 1.15rem; }
.item .meta { color: var(--faint); font-size: 0.78rem; margin-top: 0.2rem; }

.keys {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 0.28rem;
  margin-top: 0.7rem;
}

.keys button, .tones button {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 0.55rem;
  min-height: 2.6rem;
  padding: 0;
}

.tones { display: flex; gap: 0.35rem; margin-top: 0.55rem; }
.tones button { flex: 1; font-family: var(--serif); font-size: 1.15rem; }

.pad {
  width: 100%;
  height: 11rem;
  border-radius: 1rem;
  border: 1px dashed var(--line);
  background: #fff;
  touch-action: none;
  display: block;
}

.candidates { display: flex; flex-direction: column; gap: 0.4rem; margin-top: 0.7rem; }

.candidate {
  text-align: left;
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: 0.8rem;
  padding: 0.65rem 0.75rem;
}

.candidate.on { border-color: var(--accent); }

.nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.4rem 0.6rem calc(0.4rem + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}

.nav a {
  flex: 1;
  max-width: 8rem;
  text-align: center;
  text-decoration: none;
  color: var(--faint);
  font-size: 0.78rem;
  padding: 0.45rem 0.2rem;
  border-radius: 0.7rem;
}

.nav a.on { color: var(--ink); }

.gate { max-width: 24rem; margin: 12vh auto 0; }

.error { color: var(--accent); min-height: 1.2rem; margin: 0.4rem 0 0; }

.pattern-formula {
  font-family: var(--serif);
  font-size: 1.25rem;
  margin: 0.3rem 0;
}

footer.dict {
  margin-top: 2rem;
  color: var(--faint);
  font-size: 0.75rem;
  line-height: 1.4;
}

.hidden { display: none; }