:root {
  --bg: #f6efe4;
  --paper: rgba(255, 252, 246, 0.92);
  --ink: #20222b;
  --muted: #6b6f77;
  --line: rgba(32, 34, 43, 0.12);
  --accent: #b55233;
  --accent-deep: #8a3f27;
  --good: #217346;
  --bad: #b42318;
  --info: #1d4ed8;
  --shadow: 0 20px 60px rgba(32, 34, 43, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(181, 82, 51, 0.16), transparent 24%),
    radial-gradient(circle at right 20%, rgba(33, 115, 70, 0.12), transparent 22%),
    linear-gradient(180deg, #f9f4eb 0%, var(--bg) 100%);
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 80px;
}

.hero {
  padding: 24px 0 20px;
}

.eyebrow,
.panel-eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1;
}

h2 {
  margin: 0;
  font-size: 1.35rem;
}

.intro {
  max-width: 760px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.panel {
  margin-top: 22px;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.field-grid {
  display: grid;
  gap: 16px;
}

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

.setup-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field span {
  font-weight: 700;
}

.field select,
.field input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fffdf9;
  color: var(--ink);
  font-size: 1rem;
}

.setup-meta,
.auth-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.auth-user-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.auth-user-copy {
  margin: 0;
  color: var(--muted);
}

.setup-meta p,
.auth-status,
.save-status {
  margin: 0;
  color: var(--muted);
}

.save-status {
  margin-top: 10px;
  min-height: 24px;
}

.save-status.success {
  color: var(--good);
  font-weight: 700;
}

.save-status.info {
  color: var(--info);
  font-weight: 700;
}

.save-status.error {
  color: var(--bad);
  font-weight: 700;
}

.primary-button,
.secondary-button,
.ghost-button {
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.primary-button {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
}

.secondary-button {
  color: var(--ink);
  background: rgba(32, 34, 43, 0.08);
}

.ghost-button {
  color: var(--accent-deep);
  background: rgba(181, 82, 51, 0.08);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.quiz-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
}

.quiz-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
}

.question-list {
  display: grid;
  gap: 18px;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 22px;
}

.question-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.question-meta {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
}

.question-prompt {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
}

.option-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.option-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.option-item input {
  margin-top: 4px;
}

.option-label strong {
  display: inline-block;
  min-width: 20px;
}

.result-summary h2 {
  margin: 4px 0 10px;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.result-label,
#scoreDetail {
  margin: 0;
  color: var(--muted);
}

.review-list {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.review-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
}

.review-card.correct {
  border-color: rgba(33, 115, 70, 0.28);
  background: rgba(33, 115, 70, 0.06);
}

.review-card.incorrect {
  border-color: rgba(180, 35, 24, 0.22);
  background: rgba(180, 35, 24, 0.05);
}

.review-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.review-card p {
  margin: 6px 0;
  line-height: 1.7;
}

.review-answer-good {
  color: var(--good);
  font-weight: 700;
}

.review-answer-bad {
  color: var(--bad);
  font-weight: 700;
}

.hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .setup-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 20px, 1120px);
    padding-top: 24px;
  }

  .auth-grid,
  .setup-grid {
    grid-template-columns: 1fr;
  }

  .panel-heading,
  .quiz-header,
  .setup-meta,
  .auth-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .quiz-actions {
    justify-content: stretch;
  }
}