:root {
  --bg: #f3f1ec;
  --panel: #ffffff;
  --ink: #1c1d1b;
  --muted: #7b7b74;
  --line: #e3e0d8;
  --accent: #24594d;
  --accent-soft: #e3ece8;
  --good: #2f7d5c;
  --good-soft: #e5f1ea;
  --bad: #b24b40;
  --bad-soft: #f7e8e5;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 16px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 2px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
}

.brand-text {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
}

.topbar-meta {
  font-size: 12px;
  color: var(--muted);
}

.stage {
  display: flex;
  flex-direction: column;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 1px 2px rgba(28, 29, 27, 0.04);
}

.hidden {
  display: none !important;
}

.panel-head h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 650;
  letter-spacing: 0;
}

.sub {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.field {
  margin-top: 24px;
}

.field-label {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 10px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  gap: 8px;
}

.seg-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #faf9f6;
  color: var(--ink);
  font-size: 14px;
  line-height: 1;
  padding: 12px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.seg-btn:hover {
  border-color: #c9c6bd;
}

.seg-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.primary-btn,
.ghost-btn {
  appearance: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  padding: 13px 18px;
  line-height: 1;
  transition: opacity 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.primary-btn {
  width: 100%;
  margin-top: 28px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.primary-btn:hover {
  background: #1d4b41;
}

.ghost-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.ghost-btn:hover {
  border-color: #c9c6bd;
  background: #faf9f6;
}

.quiz-head {
  margin-bottom: 22px;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 10px;
}

.progress-track {
  height: 3px;
  background: #eceae4;
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.25s ease;
}

.question {
  min-height: 150px;
}

.q-type {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 10px;
}

.q-school {
  font-size: 24px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: 0;
  margin: 0 0 8px;
}

.q-note {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.q-ask {
  font-size: 15px;
  margin-top: 18px;
}

.options {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.option {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  padding: 14px 14px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.option:hover:not(:disabled) {
  border-color: #b7b4aa;
}

.option:disabled {
  cursor: default;
}

.option .opt-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 26px;
  height: 26px;
  border-radius: 5px;
  background: #f3f1ec;
  color: #55554e;
  font-size: 13px;
  font-weight: 600;
}

.option.correct {
  background: var(--good-soft);
  border-color: var(--good);
}

.option.correct .opt-key {
  background: var(--good);
  color: #fff;
}

.option.wrong {
  background: var(--bad-soft);
  border-color: var(--bad);
}

.option.wrong .opt-key {
  background: var(--bad);
  color: #fff;
}

.option.dim {
  opacity: 0.55;
}

.feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.65;
}

.feedback.right {
  background: var(--good-soft);
  color: #1f5d44;
}

.feedback.wrong {
  background: var(--bad-soft);
  color: #8f372f;
}

.quiz-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  gap: 12px;
}

.quiz-actions .primary-btn {
  width: auto;
  min-width: 120px;
  margin-top: 0;
}

.result-hero {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}

.score-ring {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 132px;
  height: 132px;
  flex: 0 0 132px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) 0deg, #eceae4 0deg);
}

.score-ring::before {
  content: "";
  position: absolute;
  inset: 9px;
  background: var(--panel);
  border-radius: 50%;
}

.score-ring span {
  position: relative;
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 0;
}

.score-ring span::after {
  content: "分";
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  margin-left: 2px;
}

.result-stats {
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.result-stats strong {
  color: var(--ink);
  font-weight: 600;
}

.mistakes {
  margin-top: 26px;
  max-height: 380px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.mistakes-title {
  position: sticky;
  top: 0;
  background: #faf9f6;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

.mistake-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
}

.mistake-item:last-child {
  border-bottom: 0;
}

.mistake-item .m-school {
  font-weight: 600;
  font-size: 14px;
}

.mistake-item .m-answer {
  color: var(--bad);
}

.mistake-item .m-correct {
  color: var(--good);
}

.mistakes-empty {
  padding: 22px 16px;
  text-align: center;
  color: var(--good);
  font-size: 14px;
}

.result-actions {
  display: flex;
  gap: 12px;
  margin-top: 26px;
}

.result-actions .primary-btn,
.result-actions .ghost-btn {
  margin-top: 0;
}

.result-actions .primary-btn {
  flex: 1.4;
}

.result-actions .ghost-btn {
  flex: 1;
}

@media (max-width: 560px) {
  .app {
    padding: 12px 10px 36px;
  }

  .topbar {
    padding-bottom: 14px;
  }

  .panel {
    padding: 20px 16px;
  }

  .panel-head h1 {
    font-size: 22px;
  }

  .q-school {
    font-size: 20px;
  }

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

  .result-hero {
    justify-content: center;
    gap: 18px;
  }

  .result-actions {
    flex-direction: column;
  }
}