:root {
  --ink: #18312d;
  --muted: #60716d;
  --paper: #fffdf8;
  --cream: #f4efe4;
  --green: #1d5c50;
  --green-dark: #123f37;
  --mint: #dceee8;
  --gold: #c18b32;
  --red: #b33a3a;
  --red-soft: #fff0ef;
  --ok: #22724f;
  --ok-soft: #e8f6ef;
  --line: #d7dfdb;
  --shadow: 0 16px 40px rgba(23, 57, 50, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #edf5f1 0, #f8f4ea 420px, var(--cream) 100%);
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  line-height: 1.7;
}
button, a { font: inherit; }
button { touch-action: manipulation; }
[hidden] { display: none !important; }

.topbar {
  min-height: 68px;
  padding: 12px max(20px, calc((100vw - 1120px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,.9);
  border-bottom: 1px solid rgba(24,49,45,.1);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
}
.brand { color: var(--green-dark); font-weight: 900; font-size: 1.25rem; text-decoration: none; }
.home-link, .back-button { color: var(--green); font-weight: 800; }
.home-link { text-decoration: none; }
.back-button { border: 0; background: transparent; padding: 8px 0; cursor: pointer; }

main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 36px 0 80px; }
.hero { padding: clamp(30px, 7vw, 72px) 0 38px; }
.eyebrow, .step { margin: 0 0 6px; color: var(--gold); font-weight: 900; letter-spacing: .12em; font-size: .82rem; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(2.25rem, 7vw, 4.8rem); line-height: 1.05; letter-spacing: -.04em; }
.hero > p:last-child { max-width: 700px; margin: 18px 0 0; color: var(--muted); font-size: 1.08rem; }

.panel, .quiz-shell { background: rgba(255,255,255,.9); border: 1px solid rgba(24,49,45,.09); border-radius: 24px; padding: clamp(20px, 4vw, 38px); box-shadow: var(--shadow); }
.section-heading h2, .quiz-heading h2 { margin: 0; font-size: clamp(1.65rem, 4vw, 2.4rem); }
.year-grid, .exam-grid { display: grid; gap: 16px; margin-top: 24px; }
.year-grid { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.exam-grid { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.year-card, .exam-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
  padding: 22px;
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.year-card:hover, .exam-card:hover, .year-card:focus-visible, .exam-card:focus-visible { transform: translateY(-2px); border-color: var(--green); box-shadow: 0 10px 28px rgba(29,92,80,.12); }
.year-card strong { display: block; font-size: 2rem; }
.exam-card h3 { margin: 4px 0 8px; font-size: 1.18rem; }
.exam-card p { margin: 0; color: var(--muted); }
.exam-code { color: var(--gold); font-weight: 900; font-size: .78rem; letter-spacing: .08em; }

.quiz-heading { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin: 16px 0 28px; }
.muted { color: var(--muted); }
.progress-box { min-width: 110px; padding: 12px 16px; border-radius: 14px; background: var(--mint); text-align: center; }
.progress-box strong, .progress-box span { display: block; }
.progress-box strong { color: var(--green-dark); font-size: 1.25rem; }
.progress-box span { color: var(--muted); font-size: .8rem; }

.passage-card, .option-bank, .answer-sheet, .study-card, .score-card { margin-top: 22px; border: 1px solid var(--line); border-radius: 20px; background: var(--paper); padding: clamp(18px, 4vw, 30px); }
.passage-card h3, .option-bank h3, .answer-sheet h3, .study-card h3 { margin-top: 0; }
.passage { font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.08rem, 2.2vw, 1.25rem); line-height: 1.95; color: #1e2b29; }
.passage p { margin: 0 0 1.2em; }
.inline-blank { display: inline-flex; align-items: center; justify-content: center; min-width: 4.3em; margin: 0 .12em; padding: .05em .35em; border: 0; border-bottom: 2px solid var(--green); background: var(--mint); color: var(--green-dark); border-radius: 6px 6px 0 0; font-family: inherit; font-weight: 800; cursor: pointer; }
.inline-blank.answered { background: #fff2cf; border-color: var(--gold); }

.option-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px 18px; }
.option-item { margin: 0; padding: 10px 12px; background: #f3f7f5; border-radius: 10px; font-family: Georgia, "Times New Roman", serif; font-size: 1.05rem; }
.option-letter { color: var(--green); font-weight: 900; }

.answer-row { display: grid; grid-template-columns: 70px 1fr; gap: 14px; align-items: center; padding: 16px 0; border-top: 1px solid var(--line); }
.answer-row:first-child { border-top: 0; }
.question-number { font-weight: 900; font-size: 1.1rem; }
.choice-grid { display: grid; grid-template-columns: repeat(10, minmax(42px,1fr)); gap: 7px; }
.choice-button { min-height: 44px; border: 1px solid #a8b9b4; border-radius: 10px; background: white; color: var(--ink); font-weight: 900; cursor: pointer; }
.choice-button:hover, .choice-button:focus-visible { border-color: var(--green); background: var(--mint); }
.choice-button.selected { background: var(--green); color: white; border-color: var(--green); }
.choice-button:disabled { cursor: default; opacity: .9; }
.submit-message { min-height: 1.7em; color: var(--red); font-weight: 700; }
.primary-button, .secondary-button { width: 100%; min-height: 54px; border: 0; border-radius: 14px; font-weight: 900; cursor: pointer; }
.primary-button { background: var(--green); color: white; }
.primary-button:disabled { background: #aebcb8; cursor: not-allowed; }
.secondary-button { margin-top: 24px; background: white; color: var(--green); border: 2px solid var(--green); }

.results { margin-top: 30px; }
.score-card { background: var(--green-dark); color: white; }
.score-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.score-item { padding: 14px 10px; border-radius: 12px; background: rgba(255,255,255,.11); text-align: center; }
.score-item strong, .score-item span { display: block; }
.score-item strong { font-size: 1.55rem; }
.score-item span { font-size: .8rem; opacity: .8; }
.review-list { display: grid; gap: 16px; }
.review-card { border: 2px solid var(--line); border-radius: 18px; background: white; padding: clamp(18px, 4vw, 28px); }
.review-card.correct { border-color: #a9d8c1; background: var(--ok-soft); }
.review-card.wrong { border-color: #e3aaa5; background: var(--red-soft); }
.review-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.review-head h4 { margin: 0; font-size: 1.2rem; }
.status-badge { border-radius: 999px; padding: 5px 11px; font-weight: 900; }
.correct .status-badge { background: var(--ok); color: white; }
.wrong .status-badge { background: var(--red); color: white; }
.answer-pair { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 14px 0; }
.answer-pair p { margin: 0; }
.explanation-block { margin-top: 14px; padding-top: 14px; border-top: 1px solid rgba(24,49,45,.16); }
.explanation-block h5 { margin: 0 0 5px; font-size: 1rem; color: var(--green-dark); }
.explanation-block p { margin: 0; white-space: pre-line; }
.translation p { margin: 0 0 1em; }
.vocab-list { display: grid; grid-template-columns: minmax(150px, .8fr) 1.5fr; gap: 7px 18px; margin: 0; }
.vocab-list dt { font-weight: 900; color: var(--green-dark); }
.vocab-list dd { margin: 0; }
footer { padding: 28px 16px; text-align: center; color: var(--muted); }

@media (max-width: 760px) {
  main { width: min(100% - 20px, 1120px); padding-top: 16px; }
  .topbar { min-height: 58px; padding-inline: 14px; }
  .quiz-heading { display: block; }
  .progress-box { margin-top: 14px; width: 100%; }
  .option-grid { grid-template-columns: 1fr; }
  .answer-row { grid-template-columns: 1fr; gap: 8px; }
  .choice-grid { grid-template-columns: repeat(5, minmax(46px,1fr)); }
  .choice-button { min-height: 50px; }
  .score-grid { grid-template-columns: repeat(2, 1fr); }
  .vocab-list { grid-template-columns: 1fr; gap: 2px; }
  .vocab-list dd { margin-bottom: 10px; }
}

@media (max-width: 380px) {
  .choice-grid { grid-template-columns: repeat(5, minmax(40px,1fr)); gap: 5px; }
  .panel, .quiz-shell { padding: 16px; border-radius: 18px; }
}