:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --line: #2a2f3a;
  --text: #e8e6e1;
  --muted: #8b909c;
  --accent: #e0a84b;
  --good: #5fbf8f;
  --warn: #d9a441;
  --bad: #d96b6b;
  --radius: 14px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
  overscroll-behavior-y: none;
}
.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 22px 18px calc(28px + env(safe-area-inset-bottom));
}
.loading { color: var(--muted); text-align: center; padding-top: 40vh; }

.hero { padding: 18px 0 10px; }
.kicker {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: .22em;
  font-weight: 600;
}
h1 { font-size: 34px; margin: 8px 0 6px; letter-spacing: .02em; }
.sub { color: var(--muted); margin: 0; font-size: 15px; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin: 20px 0;
}
.row { display: flex; align-items: center; }
.row.between { justify-content: space-between; }
.row.gap { gap: 10px; margin-top: 10px; }
.row.gap > * { flex: 1; min-width: 0; }

.bar {
  height: 8px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
  margin: 12px 0 18px;
}
.bar.slim { height: 4px; margin: 10px 0 24px; }
.bar > i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #f0c375);
  border-radius: 999px;
  transition: width .25s ease;
}

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; text-align: center; }
.stats b { display: block; font-size: 24px; font-weight: 700; }
.stats span { color: var(--muted); font-size: 12px; }
.good { color: var(--good); }
.warn { color: var(--warn); }
.bad { color: var(--bad); }

button { font-family: inherit; cursor: pointer; border: none; }
.primary {
  width: 100%;
  background: var(--accent);
  color: #1a1408;
  font-size: 17px;
  font-weight: 700;
  padding: 15px 18px;
  border-radius: var(--radius);
  letter-spacing: .02em;
}
.primary:active { transform: translateY(1px); }
.primary:disabled { opacity: .5; }
.ghost {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 13px 16px;
  border-radius: var(--radius);
  font-size: 15px;
}
.ghost:active { background: var(--panel-2); }
.icon {
  background: transparent;
  color: var(--muted);
  font-size: 20px;
  padding: 4px 10px;
  border-radius: 10px;
}

.hint { color: var(--muted); font-size: 12px; text-align: center; margin-top: 18px; line-height: 1.7; }
.hint code { color: var(--accent); background: var(--panel); padding: 2px 6px; border-radius: 6px; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
}
.combo { color: var(--accent); font-weight: 700; min-width: 70px; text-align: right; }

.question { text-align: center; padding: 26px 0 22px; }
.word { font-size: 42px; font-weight: 700; letter-spacing: .01em; word-break: break-word; }
.phon { color: var(--muted); margin-top: 8px; font-size: 15px; }
.meaning { font-size: 26px; font-weight: 600; line-height: 1.4; }
.pos { color: var(--muted); margin-top: 8px; font-size: 14px; }

.options { display: grid; gap: 10px; }
.option {
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  text-align: left;
  padding: 15px 16px;
  border-radius: var(--radius);
  font-size: 16px;
  line-height: 1.4;
  transition: border-color .15s, background .15s;
}
.option:active { background: var(--panel-2); }
.option.correct { border-color: var(--good); background: rgba(95,191,143,.12); }
.option.wrong { border-color: var(--bad); background: rgba(217,107,107,.12); }
.option.unsure { color: var(--muted); text-align: center; font-size: 14px; }
.option:disabled { cursor: default; }

.feedback { min-height: 28px; margin-top: 16px; text-align: center; font-size: 15px; line-height: 1.6; }
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }
.feedback .ans { color: var(--text); font-weight: 700; }

.spell { display: grid; gap: 10px; margin-top: 8px; }
.spell input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 22px;
  padding: 14px 16px;
  border-radius: var(--radius);
  text-align: center;
  letter-spacing: .04em;
  outline: none;
}
.spell input:focus { border-color: var(--accent); }

.report-head { text-align: center; padding: 20px 0 6px; }
.report-head .big { font-size: 52px; font-weight: 700; color: var(--accent); }
.report-head .cap { color: var(--muted); font-size: 14px; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0; text-align: center; }
.stat-grid b { display: block; font-size: 22px; }
.stat-grid span { color: var(--muted); font-size: 12px; }
.tier-list { display: grid; gap: 10px; margin: 16px 0; }
.tier-row { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.tier-row .bar { flex: 1; margin: 0; height: 6px; }
.tier-row .lbl { width: 44px; }

.clean-list { display: grid; gap: 8px; }
.clean-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
}
.clean-row.removed { opacity: .45; }
.clean-main { display: flex; flex-direction: column; min-width: 0; }
.clean-main b { font-size: 17px; }
.clean-main span { color: var(--muted); font-size: 13px; margin-top: 2px; }
.clean-btn {
  flex: 0 0 auto;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 13px;
}
.clean-btn.on { border-color: var(--bad); color: var(--bad); }
.clean-row.pending { border-color: var(--warn); }
.clean-row.pending .clean-btn { border-color: var(--warn); color: var(--warn); }
.tabs { display: flex; gap: 8px; margin: 4px 0 14px; }
.tab {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 10px;
  border-radius: 10px;
  font-size: 14px;
}
.tab.on { border-color: var(--accent); color: var(--accent); background: rgba(224,168,75,.08); }
.empty { color: var(--muted); text-align: center; padding: 30px 0; }

.settings h2 { font-size: 20px; margin: 4px 0 18px; }
.field { margin-bottom: 22px; }
.field > label { display: block; color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.seg { display: flex; gap: 8px; }
.seg button {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 12px;
  border-radius: 12px;
  font-size: 15px;
}
.seg button.on { border-color: var(--accent); color: var(--accent); background: rgba(224,168,75,.08); }
.codebox { display: flex; gap: 8px; }
.codebox input {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--accent);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 15px;
  letter-spacing: .08em;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  outline: none;
}
.codebox button { flex: 0 0 auto; }
.note { color: var(--muted); font-size: 12px; line-height: 1.6; margin-top: 6px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 50;
}
.toast.show { opacity: 1; }

@media (min-width: 600px) {
  .app { padding-top: 40px; }
  .word { font-size: 52px; }
}