:root {
  --bg: #f6f8fb;
  --ink: #172033;
  --muted: #5d6a7d;
  --line: #d8e0eb;
  --panel: #ffffff;
  --brand: #126d77;
  --brand-dark: #0b4f59;
  --accent: #f2b84b;
  --good: #18794e;
  --bad: #c2362b;
  --focus: #2f80ed;
  --shadow: 0 16px 40px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(18, 109, 119, 0.1), transparent 32%),
    radial-gradient(circle at 95% 10%, rgba(242, 184, 75, 0.16), transparent 26%),
    var(--bg);
  color: var(--ink);
  font-family:
    "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.6;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr minmax(220px, 280px);
  gap: 24px;
  align-items: end;
  padding: 34px 0 22px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--brand);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 920px;
  font-size: clamp(2.1rem, 4.4vw, 3.55rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.25;
}

.course {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 700;
}

.panel,
.question-card,
.review-card {
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.status-card {
  padding: 18px;
  background: var(--ink);
  color: #fff;
  border-radius: 8px;
}

.status-label {
  display: block;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  font-weight: 700;
}

#progressText {
  display: block;
  margin-top: 2px;
  font-size: 2rem;
  line-height: 1.1;
}

.progress-track {
  height: 10px;
  margin-top: 14px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
  transition: width 180ms ease;
}

.intro-panel {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 24px;
  margin-bottom: 18px;
}

.intro-copy p {
  margin: 8px 0 0;
  color: var(--muted);
  font-weight: 650;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 1.35rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 22px;
}

label span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 800;
}

input,
select {
  width: 100%;
  min-height: 54px;
  padding: 12px 14px;
  border: 1px solid #c7d2e2;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 1.05rem;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 4px solid rgba(47, 128, 237, 0.2);
  border-color: var(--focus);
}

.questions {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.question-card {
  padding: 24px;
}

.question-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.question-number {
  display: inline-grid;
  place-items: center;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  background: #e6f2f3;
  color: var(--brand-dark);
  border-radius: 8px;
  font-weight: 900;
}

.question-title {
  margin: 0;
  font-size: clamp(1.24rem, 2.3vw, 1.55rem);
  line-height: 1.45;
  font-weight: 900;
}

.options {
  display: grid;
  gap: 12px;
}

.option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: flex-start;
  padding: 16px;
  border: 2px solid #dce4ee;
  border-radius: 8px;
  background: #fbfcfe;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.option:hover {
  border-color: #97bbc2;
  transform: translateY(-1px);
}

.option input {
  width: 24px;
  height: 24px;
  min-height: 24px;
  margin: 3px 0 0;
  accent-color: var(--brand);
}

.option-text {
  color: var(--ink);
  font-size: clamp(1.06rem, 2vw, 1.22rem);
  font-weight: 750;
}

.submit-bar {
  display: flex;
  justify-content: flex-end;
  gap: 14px;
  padding: 24px 0 0;
}

.primary-button,
.secondary-button {
  min-height: 56px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 900;
}

.primary-button {
  border: 1px solid var(--brand-dark);
  background: var(--brand);
  color: #fff;
}

.primary-button:hover {
  background: var(--brand-dark);
}

.secondary-button {
  border: 1px solid #bcc9d8;
  background: #fff;
  color: var(--ink);
}

.result-panel {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 26px;
  align-items: center;
  margin-top: 22px;
  padding: 26px;
}

.result-panel[hidden],
.review-panel[hidden] {
  display: none;
}

.score-ring {
  display: grid;
  place-items: center;
  width: 148px;
  height: 148px;
  border: 12px solid var(--accent);
  border-radius: 999px;
  background: #fff9eb;
}

.score-ring span {
  display: block;
  font-size: 3.6rem;
  font-weight: 950;
  line-height: 0.9;
}

.score-ring small {
  color: var(--muted);
  font-weight: 900;
}

.result-copy p {
  margin: 8px 0 0;
}

.sheet-status {
  color: var(--muted);
  font-weight: 800;
}

.review-panel {
  margin-top: 28px;
}

.section-heading {
  margin-bottom: 14px;
}

.review-list {
  display: grid;
  gap: 14px;
}

.review-card {
  padding: 20px;
  border-left: 8px solid var(--line);
}

.review-card.correct {
  border-left-color: var(--good);
}

.review-card.wrong {
  border-left-color: var(--bad);
}

.review-card h3 {
  margin: 0 0 10px;
  font-size: 1.22rem;
}

.review-card p {
  margin: 6px 0;
  font-weight: 700;
}

.correct-text {
  color: var(--good);
}

.wrong-text {
  color: var(--bad);
}

.settings-dialog {
  width: min(620px, calc(100% - 28px));
  border: 0;
  border-radius: 8px;
  padding: 0;
  box-shadow: 0 30px 80px rgba(23, 32, 51, 0.24);
}

.settings-dialog::backdrop {
  background: rgba(23, 32, 51, 0.44);
}

.settings-dialog form {
  padding: 24px;
}

.dialog-head,
.dialog-actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.dialog-head {
  margin-bottom: 18px;
}

.dialog-actions {
  justify-content: flex-end;
  margin-top: 20px;
}

.hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.96rem;
  font-weight: 650;
}

@media (max-width: 860px) {
  body {
    font-size: 17px;
  }

  .app-shell {
    width: min(100% - 24px, 720px);
    padding-top: 18px;
  }

  .topbar,
  .result-panel {
    grid-template-columns: 1fr;
  }

  .profile-grid {
    grid-template-columns: 1fr 1fr;
  }

  .score-ring {
    width: 132px;
    height: 132px;
  }
}

@media (max-width: 560px) {
  .intro-panel,
  .submit-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .profile-grid {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .question-card {
    padding: 18px;
  }

  .question-head {
    gap: 10px;
  }

  .question-number {
    flex-basis: 38px;
    width: 38px;
    height: 38px;
  }

  .option {
    padding: 14px;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }
}