:root {
  --ink: #17324d;
  --ink-2: #244965;
  --teal: #0f766e;
  --teal-soft: #e7f4f0;
  --gold: #c88a24;
  --paper: #f5f1e7;
  --card: #fffdf8;
  --line: #d8d6cc;
  --muted: #627080;
  --danger: #b6423b;
  --danger-soft: #fbecea;
  --success: #217a52;
  --success-soft: #e8f6ee;
  --shadow: 0 16px 38px rgba(24, 47, 68, 0.11);
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 0%, rgba(200, 138, 36, 0.10), transparent 26rem),
    linear-gradient(180deg, #f9f7f0 0%, var(--paper) 100%);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  line-height: 1.55;
}

button, input, select { font: inherit; }
button, label, select { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
[hidden] { display: none !important; }

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  color: #fff;
  background: rgba(23, 50, 77, 0.97);
  border-bottom: 3px solid var(--gold);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: min(1180px, calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: #f2d38d;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 12px;
  font-weight: 900;
  letter-spacing: -.04em;
}

.brand strong, .brand small { display: block; }
.brand strong { font-size: 1.02rem; letter-spacing: .02em; }
.brand small { margin-top: -2px; color: #cbd9e5; font-size: .75rem; }

.header-actions { display: flex; align-items: center; gap: 8px; }
.ghost-button {
  min-height: 38px;
  padding: 7px 12px;
  color: #eef6fb;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 9px;
}
.ghost-button:hover { background: rgba(255,255,255,.14); }

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 30px auto 64px;
}

.view { display: none; }
.view.is-active { display: block; }

.hero-card {
  padding: 34px 38px;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  align-items: center;
  gap: 32px;
  color: #fff;
  background: linear-gradient(135deg, var(--ink), var(--ink-2));
  border-radius: 22px;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.hero-card::after {
  content: "A Z";
  position: absolute;
  right: -18px;
  bottom: -48px;
  color: rgba(255,255,255,.045);
  font: 900 9rem/1 Georgia, serif;
  letter-spacing: -.18em;
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--gold);
  font-weight: 800;
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hero-card h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.1rem); line-height: 1.18; }
.hero-copy { max-width: 650px; margin: 14px 0 0; color: #d7e1e9; }

.hero-stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; position: relative; z-index: 1; }
.hero-stat {
  min-height: 112px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 15px;
}
.hero-stat strong { font: 800 1.75rem/1.1 Georgia, "Times New Roman", serif; color: #f5dca4; }
.hero-stat span { margin-top: 7px; color: #dbe6ed; font-size: .76rem; }

.notice-panel {
  margin-top: 20px;
  padding: 15px 18px;
  color: var(--ink-2);
  background: #eef5f7;
  border: 1px solid #c8dce3;
  border-radius: 12px;
}
.notice-panel.error { color: var(--danger); background: var(--danger-soft); border-color: #efbdb8; }
.notice-panel span { display: block; font-size: .9rem; }

.setup-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.panel {
  padding: 24px;
  background: rgba(255,253,248,.94);
  border: 1px solid var(--line);
  border-radius: 17px;
  box-shadow: 0 8px 22px rgba(40, 54, 65, .055);
}
.panel.span-2, .action-panel { grid-column: 1 / -1; }

.panel-heading {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.panel-heading.compact { margin-bottom: 17px; }
.panel-heading > div { display: flex; align-items: center; gap: 10px; }
.panel h2 { margin: 0; font-size: 1.18rem; }
.step-number {
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: #fff;
  background: var(--teal);
  border-radius: 50%;
  font: 800 .83rem/1 system-ui, sans-serif;
}
.selection-summary { color: var(--teal); font-weight: 800; font-size: .9rem; }

.segmented-control { display: grid; gap: 10px; }
.segmented-control.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.segmented-control.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.segmented-control label, .choice-list label, .mode-buttons label, .delivery-mode-grid label, .compact-options label { cursor: pointer; }
.segmented-control input, .choice-list input, .mode-buttons input, .level-grid input, .delivery-mode-grid input, .compact-options input { position: absolute; opacity: 0; pointer-events: none; }
.segmented-control span {
  min-height: 76px;
  padding: 13px 15px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--ink);
  background: #faf9f4;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  font-weight: 800;
  transition: .18s ease;
}
.segmented-control small, .choice-list small { display: block; margin-top: 3px; color: var(--muted); font-weight: 500; }
.segmented-control input:checked + span { color: var(--teal); background: var(--teal-soft); border-color: var(--teal); box-shadow: inset 0 0 0 1px var(--teal); }
.segmented-control input:focus-visible + span, .choice-list input:focus-visible + span, .mode-buttons input:focus-visible + span, .level-grid input:focus-visible + span, .delivery-mode-grid input:focus-visible + span, .compact-options input:focus-visible + span { outline: 3px solid rgba(15,118,110,.22); outline-offset: 2px; }

.source-note { margin: 14px 2px 0; color: var(--muted); font-size: .85rem; }
.field-label { display: block; margin-bottom: 8px; color: var(--ink-2); font-weight: 800; font-size: .86rem; }
.field-label.spaced { margin-top: 20px; }
select, input[type="number"], input[type="search"] {
  width: 100%;
  min-height: 44px;
  padding: 9px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #c8c9c4;
  border-radius: 9px;
}
select:focus, input:focus { outline: 3px solid rgba(15,118,110,.16); border-color: var(--teal); }

.level-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.level-grid span {
  min-height: 55px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #faf9f5;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font-weight: 800;
}
.level-grid small { color: var(--muted); font-size: .7rem; font-weight: 500; }
.level-grid input:checked + span { color: #fff; background: var(--teal); border-color: var(--teal); }
.level-grid input:checked + span small { color: #dff3ef; }

.stacked-fields { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.stacked-fields label { color: var(--ink-2); font-size: .78rem; font-weight: 800; }
.stacked-fields select { margin-top: 4px; }
.lesson-field { grid-column: 1 / -1; }
.lesson-field-heading { margin-bottom: 7px; display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--ink-2); font-size: .78rem; font-weight: 800; }
.lesson-actions { display: flex; gap: 5px; }
.lesson-actions button { padding: 4px 9px; color: var(--teal); background: #fff; border: 1px solid var(--teal); border-radius: 999px; font: inherit; cursor: pointer; }
.lesson-actions button:hover { color: #fff; background: var(--teal); }
.lesson-checklist { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.lesson-checklist label { cursor: pointer; }
.lesson-checklist input { position: absolute; opacity: 0; pointer-events: none; }
.lesson-checklist span { min-height: 48px; padding: 7px 9px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; color: var(--ink); background: #faf9f5; border: 1.5px solid var(--line); border-radius: 9px; }
.lesson-checklist small { margin-top: 2px; color: var(--muted); font-size: .68rem; font-weight: 500; }
.lesson-checklist input:checked + span { color: #fff; background: var(--teal); border-color: var(--teal); }
.lesson-checklist input:checked + span small { color: #dff3ef; }
.lesson-checklist input:focus-visible + span { outline: 3px solid rgba(15,118,110,.22); outline-offset: 2px; }
.lesson-selection-note { margin: 10px 0 0; color: var(--teal); font-size: .78rem; font-weight: 700; }
.lesson-selection-note.is-error { color: var(--danger); }
.empty-hint { margin: 12px 0 0; color: var(--danger); font-size: .83rem; }

.choice-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.choice-list span {
  min-height: 78px;
  padding: 12px 13px;
  display: block;
  background: #faf9f5;
  border: 1.5px solid var(--line);
  border-radius: 10px;
}
.choice-list input:checked + span { color: var(--teal); background: var(--teal-soft); border-color: var(--teal); }

.inline-fields { display: grid; grid-template-columns: 1fr minmax(90px, .35fr); gap: 9px; }
.mode-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.mode-buttons span { display: block; padding: 10px; text-align: center; background: #faf9f5; border: 1.5px solid var(--line); border-radius: 9px; font-weight: 700; }
.mode-buttons input:checked + span { color: #fff; background: var(--ink-2); border-color: var(--ink-2); }

.delivery-mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; }
.delivery-mode-grid span {
  min-height: 76px;
  padding: 11px 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  background: #faf9f5;
  border: 1.5px solid var(--line);
  border-radius: 10px;
}
.delivery-mode-grid strong, .delivery-mode-grid small { display: block; }
.delivery-mode-grid small { margin-top: 3px; color: var(--muted); font-size: .74rem; }
.delivery-mode-grid input:checked + span { color: #fff; background: var(--teal); border-color: var(--teal); }
.delivery-mode-grid input:checked + span small { color: #ddf3ef; }

.paper-options {
  margin-top: 18px;
  padding: 14px;
  display: grid;
  gap: 14px;
  background: #f4f7f4;
  border: 1px solid #cfdcd5;
  border-radius: 11px;
}
.compact-options { display: flex; flex-wrap: wrap; gap: 7px; }
.compact-options span { display: block; min-width: 84px; padding: 7px 10px; text-align: center; background: #fff; border: 1px solid #c9ceca; border-radius: 8px; font-size: .82rem; font-weight: 800; }
.compact-options input:checked + span { color: #fff; background: var(--ink-2); border-color: var(--ink-2); }

.action-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  color: #fff;
  background: linear-gradient(120deg, var(--ink-2), var(--teal));
  border-color: transparent;
}
.action-panel h2 { font-size: 1.45rem; }
.action-panel p:not(.eyebrow) { margin: 6px 0 0; color: #dceeea; }
.action-stack { min-width: 220px; display: grid; gap: 8px; }

.primary-button, .secondary-button, .danger-button, .file-button {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 9px;
  font-weight: 800;
  text-align: center;
}
.primary-button { color: #fff; background: var(--teal); border: 1px solid var(--teal); box-shadow: 0 7px 16px rgba(7,88,82,.18); }
.primary-button:hover { background: #0b625c; }
.primary-button:disabled { cursor: not-allowed; opacity: .45; }
.secondary-button { color: var(--ink); background: #fff; border: 1px solid #bcc4c9; }
.secondary-button:hover { background: #f2f5f6; }
.action-panel .primary-button { color: var(--ink); background: #f3d48f; border-color: #f3d48f; }
.action-panel .primary-button:hover { background: #ffe2a4; }
.danger-button { color: var(--danger); background: #fff; border: 1px solid #e3aaa5; }

.quiz-topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.text-button { padding: 8px 0; color: var(--ink-2); background: none; border: 0; font-weight: 800; }
.progress-copy { display: flex; gap: 18px; color: var(--muted); }
.progress-copy strong { color: var(--teal); }
.progress-track { height: 7px; margin: 10px 0 22px; background: #d9ddd9; border-radius: 999px; overflow: hidden; }
.progress-track div { height: 100%; width: 0; background: linear-gradient(90deg, var(--gold), var(--teal)); transition: width .25s ease; }

.quiz-card {
  width: min(800px, 100%);
  min-height: 520px;
  margin: 0 auto;
  padding: clamp(24px, 6vw, 50px);
  text-align: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
}
.quiz-meta { display: flex; align-items: center; justify-content: space-between; }
.quiz-meta > span { padding: 4px 9px; color: var(--teal); background: var(--teal-soft); border-radius: 999px; font-size: .76rem; font-weight: 800; }
.sound-button { padding: 6px 10px; color: var(--ink-2); background: transparent; border: 1px solid #c9ced0; border-radius: 8px; }
.question-direction { margin: 28px 0 6px; color: var(--muted); font-weight: 700; }
.quiz-card h1 { margin: 0; font: 800 clamp(2.2rem, 8vw, 4.1rem)/1.2 Georgia, "Times New Roman", serif; overflow-wrap: anywhere; }
.question-hint { min-height: 27px; margin: 10px 0 26px; color: var(--muted); }
.answer-area { display: grid; grid-template-columns: repeat(2, 1fr); gap: 11px; }
.answer-option {
  min-height: 58px;
  padding: 12px;
  color: var(--ink);
  background: #fff;
  border: 1.5px solid #c9cbc8;
  border-radius: 10px;
  font-weight: 750;
}
.answer-option:hover:not(:disabled) { color: var(--teal); background: var(--teal-soft); border-color: var(--teal); }
.option-label, .option-detail { display: block; }
.option-detail { display: none; margin-top: 4px; font-size: .8rem; font-weight: 650; opacity: .9; }
.answer-area.show-option-details .option-detail { display: block; }
.answer-option.is-correct { color: var(--success); background: var(--success-soft); border-color: var(--success); }
.answer-option.is-wrong { color: var(--danger); background: var(--danger-soft); border-color: var(--danger); }
.answer-option.is-selected { border-width: 3px; box-shadow: 0 0 0 2px #fff, 0 0 0 4px currentColor; }
.answer-option.is-selected::after { content: "（你的選擇）"; display: block; margin-top: 3px; font-size: .76rem; font-weight: 800; }
.answer-option.is-pending { color: var(--ink); background: #fff8e5; border-color: var(--gold); }
.device-storage-note { margin: 12px 0 0; padding: 10px 12px; color: var(--ink-2); background: #f3f7f5; border: 1px solid #cfddd7; border-radius: 9px; font-size: .82rem; line-height: 1.55; }
.spelling-form { display: flex; gap: 9px; justify-content: center; }
.spelling-form input { width: min(390px, 100%); min-height: 56px; padding: 10px 15px; text-align: center; color: var(--ink); background: #fff; border: 1.5px solid #bac1c4; border-radius: 10px; font: 700 1.4rem/1.2 Georgia, serif; }
.feedback-panel { margin-top: 18px; padding: 14px 16px; text-align: left; border-radius: 10px; }
.feedback-panel.correct { color: var(--success); background: var(--success-soft); border: 1px solid #b9dfc9; }
.feedback-panel.wrong { color: var(--danger); background: var(--danger-soft); border: 1px solid #efc2be; }
.feedback-panel.deferred { color: #775615; background: #fff7dd; border: 1px solid #e4ca84; }
.feedback-panel strong, .feedback-panel span { display: block; }
.feedback-panel span { margin-top: 3px; color: var(--ink-2); }
.next-button { width: 100%; margin-top: 13px; }

.result-card { width: min(780px, 100%); margin: 0 auto; padding: clamp(26px, 6vw, 48px); text-align: center; background: var(--card); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.result-card h1 { margin: 0; font-size: clamp(1.8rem, 5vw, 2.6rem); }
.result-score { margin: 23px auto 12px; display: flex; flex-direction: column; }
.result-score strong { color: var(--teal); font: 800 4.4rem/1 Georgia, serif; }
.result-score span { margin-top: 5px; color: var(--muted); }
.result-stats { margin: 25px 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.result-stats div { padding: 13px; background: #f4f4ef; border-radius: 10px; }
.result-stats strong, .result-stats span { display: block; }
.result-stats strong { font-size: 1.45rem; }
.result-stats span { color: var(--muted); font-size: .8rem; }
.review-heading { margin-top: 28px; padding-top: 20px; display: flex; align-items: baseline; justify-content: space-between; gap: 14px; text-align: left; border-top: 1px solid var(--line); }
.review-heading h2 { margin: 0; font-size: 1.05rem; }
.review-heading span { color: var(--muted); font-size: .78rem; }
.answer-review-list { max-height: 420px; margin-top: 10px; overflow: auto; text-align: left; border: 1px solid var(--line); border-radius: 10px; }
.answer-review-row { padding: 10px 11px; display: grid; grid-template-columns: 32px 1.2fr 1fr 1fr auto; align-items: center; gap: 10px; border-bottom: 1px solid #e6e5df; }
.answer-review-row:last-child { border-bottom: 0; }
.answer-review-row > div { min-width: 0; }
.answer-review-row small, .answer-review-row strong, .answer-review-row span { display: block; }
.answer-review-row small { color: var(--muted); font-size: .68rem; }
.answer-review-row strong, .answer-review-row span { overflow-wrap: anywhere; }
.answer-review-row b { padding: 3px 7px; border-radius: 999px; font-size: .72rem; }
.answer-review-row.is-correct b { color: var(--success); background: var(--success-soft); }
.answer-review-row.is-wrong { background: #fffafa; }
.answer-review-row.is-wrong b { color: var(--danger); background: var(--danger-soft); }
.review-number { width: 27px; height: 27px; display: grid !important; place-items: center; color: #fff; background: var(--ink-2); border-radius: 50%; font-size: .75rem; font-weight: 800; }
.result-actions { margin-top: 22px; display: flex; justify-content: center; flex-wrap: wrap; gap: 9px; }

.app-dialog { width: min(900px, calc(100% - 24px)); max-height: min(88vh, 860px); padding: 0; color: var(--ink); background: var(--card); border: 0; border-radius: 18px; box-shadow: 0 28px 70px rgba(12,30,45,.28); }
.app-dialog::backdrop { background: rgba(15,31,46,.58); backdrop-filter: blur(3px); }
.dialog-shell { margin: 0; padding: 24px; }
.dialog-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.dialog-header h2 { margin: 0; }
.dialog-close { width: 38px; height: 38px; color: var(--ink); background: #f0f0eb; border: 0; border-radius: 50%; font-size: 1.4rem; }
.search-row { margin: 18px 0 10px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; }
.search-row span { color: var(--muted); font-size: .82rem; }
.word-results { height: min(58vh, 520px); overflow: auto; border: 1px solid var(--line); border-radius: 10px; }
.word-row { padding: 10px 12px; display: grid; grid-template-columns: minmax(120px, 1.1fr) minmax(70px, .6fr) 1.7fr auto; gap: 12px; align-items: center; border-bottom: 1px solid #e8e7e1; }
.word-row strong { font-family: Georgia, serif; font-size: 1.08rem; }
.word-row em { color: var(--muted); font-style: normal; }
.word-row button { color: var(--teal); background: none; border: 0; }
.word-forms { grid-column: 1 / -1; padding: 8px 10px; display: flex; flex-wrap: wrap; gap: 7px 16px; color: var(--ink-2); background: #f4f6f3; border-left: 3px solid var(--gold); border-radius: 6px; font-size: .8rem; }
.word-forms span { display: block; }
.word-forms b { color: var(--teal); }
.word-forms i { color: var(--danger); font-style: normal; font-weight: 800; }
.word-forms .form-note { flex-basis: 100%; color: var(--muted); }

.import-guide { margin: 16px 0; padding: 13px 15px; background: #f2f5f3; border-left: 4px solid var(--teal); border-radius: 7px; font-size: .9rem; }
.import-guide p { margin: 3px 0; }
.import-guide code { color: var(--teal); font-weight: 700; }
.import-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.file-button { display: inline-block; color: #fff; background: var(--teal); border: 1px solid var(--teal); cursor: pointer; }
.file-button input { position: absolute; opacity: 0; pointer-events: none; }
.import-status { min-height: 24px; color: var(--muted); }
.import-preview { max-height: 260px; overflow: auto; font-size: .82rem; }
.preview-row { padding: 7px 4px; display: grid; grid-template-columns: 1fr 1fr 1fr 1fr 1.2fr 1.2fr; gap: 8px; border-bottom: 1px solid #e5e4df; }
.dialog-footer { margin-top: 18px; padding-top: 15px; display: flex; justify-content: space-between; gap: 9px; border-top: 1px solid var(--line); }

.print-sheet { display: none; }

@media (max-width: 820px) {
  .header-inner { width: min(100% - 20px, 1180px); min-height: 62px; }
  .header-actions .ghost-button:first-child { display: none; }
  .page-shell { width: min(100% - 20px, 1180px); margin-top: 18px; }
  .hero-card { grid-template-columns: 1fr; padding: 26px 22px; }
  .setup-grid { grid-template-columns: 1fr; }
  .panel.span-2, .action-panel { grid-column: auto; }
  .segmented-control.three, .segmented-control.four { grid-template-columns: 1fr; }
  .action-panel { align-items: stretch; flex-direction: column; }
  .choice-list { grid-template-columns: 1fr; }
  .delivery-mode-grid { grid-template-columns: 1fr; }
  .delivery-mode-grid span { min-height: 62px; }
  .answer-review-row { grid-template-columns: 32px 1fr 1fr; }
  .answer-review-row > div:first-of-type { grid-column: 2 / -1; }
  .answer-review-row > b { grid-column: 3; grid-row: 2; justify-self: end; }
}

@media (max-width: 560px) {
  .brand strong { font-size: .9rem; }
  .brand-mark { width: 35px; height: 35px; }
  .header-actions { gap: 5px; }
  .ghost-button { padding: 6px 8px; font-size: .78rem; }
  .hero-stat-grid { grid-template-columns: 1fr; }
  .hero-stat { min-height: 66px; flex-direction: row; gap: 10px; }
  .panel { padding: 19px 16px; }
  .level-grid { grid-template-columns: repeat(2, 1fr); }
  .stacked-fields { grid-template-columns: 1fr; }
  .lesson-checklist { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .answer-area { grid-template-columns: 1fr; }
  .spelling-form { flex-direction: column; }
  .progress-copy { font-size: .8rem; gap: 8px; }
  .review-heading { align-items: flex-start; flex-direction: column; }
  .answer-review-row { grid-template-columns: 28px 1fr; }
  .answer-review-row > div, .answer-review-row > div:first-of-type { grid-column: 2; }
  .answer-review-row > b { grid-column: 2; grid-row: auto; justify-self: start; }
  .word-row { grid-template-columns: 1fr auto; }
  .word-row > em, .word-row > span { grid-column: 1 / -1; }
  .preview-row { grid-template-columns: 1fr 1fr; }
  .dialog-footer { flex-direction: column-reverse; }
}

@media print {
  @page { size: A4 portrait; margin: 10mm 11mm; }
  body { color: #000; background: #fff; font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif; }
  .site-header, .view, .app-dialog { display: none !important; }
  .page-shell { width: auto; margin: 0; }
  .print-sheet { display: block; }
  .paper-page { height: 276mm; position: relative; overflow: hidden; break-after: page; page-break-after: always; }
  .paper-page:last-child { break-after: auto; page-break-after: auto; }
  .print-header { min-height: 18mm; padding-bottom: 3mm; display: flex; align-items: flex-end; justify-content: space-between; gap: 5mm; border-bottom: 1.5px solid #000; }
  .print-header h1 { margin: 0; font-size: 14pt; line-height: 1.15; }
  .print-header p { margin: 1mm 0 0; font-size: 8pt; }
  .print-student { white-space: nowrap; font-size: 8pt; }
  .answer-key-label { padding: 1.5mm 3mm; border: 1px solid #000; font-size: 9pt; font-weight: 800; }
  .paper-columns { height: 247mm; margin-top: 3mm; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4mm; align-items: stretch; }
  .paper-columns.columns-1 { grid-template-columns: 1fr; }
  .paper-table { width: 100%; height: 100%; border-collapse: collapse; table-layout: fixed; font-size: 8.2pt; }
  .paper-table th, .paper-table td { padding: .65mm 1mm; border: .6pt solid #333; vertical-align: middle; }
  .paper-table th { height: 5.5mm; background: #eee !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; font-size: 7.2pt; }
  .paper-table tbody tr { height: calc((247mm - 5.5mm) / var(--paper-row-count)); break-inside: avoid; }
  .paper-number, .paper-number-heading { width: 5.2mm; padding-left: .2mm !important; padding-right: .2mm !important; text-align: center; font-size: 6.8pt; }
  .paper-prompt { width: 42%; overflow-wrap: anywhere; font-weight: 650; line-height: 1.15; }
  .paper-answer { border-bottom-width: 1.2pt !important; overflow-wrap: anywhere; font-family: Georgia, "Times New Roman", "Noto Sans TC", serif; font-size: 8.6pt; }
  .is-answer-key .paper-answer { color: #000; background: #fafafa !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; font-weight: 700; }
  .paper-footer { position: absolute; right: 0; bottom: 0; color: #555; font-size: 7pt; }
}


/* v1.9 database/source disclosure and flash-card mode */
.source-disclosure { margin-top: 14px; padding: 13px 14px; background: #f4f7f6; border: 1px solid #cadbd7; border-radius: 11px; }
.source-disclosure strong { display:block; color:var(--teal); }
.source-disclosure p { margin:4px 0 7px; color:var(--muted); font-size:.84rem; }
.source-disclosure a { color:var(--ink-2); font-weight:800; font-size:.84rem; }
.study-reveal { padding: 22px; text-align:center; background:#f7f4eb; border:1px dashed #b9b6ab; border-radius:14px; }
.study-reveal strong { display:block; font-size:1.35rem; color:var(--teal); }
.study-reveal span { display:block; margin-top:7px; color:var(--muted); }
.study-actions { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; margin-top:14px; }
.study-actions button { min-height:52px; border-radius:11px; border:1px solid var(--line); font-weight:850; }
.study-again { color:var(--danger); background:var(--danger-soft); }
.study-known { color:var(--success); background:var(--success-soft); }
@media (max-width: 820px) { .delivery-mode-grid { grid-template-columns:repeat(2,minmax(0,1fr)); } }

.toeic-bank-option span { border-width: 2px; }
.new-badge { display:inline-block; margin-left:6px; padding:1px 6px; border-radius:999px; font-size:.72rem; background:var(--teal); color:#fff; vertical-align:middle; }

/* v2.4 考古題模式 */
.source-mode-control{grid-template-columns:repeat(2,minmax(0,1fr))!important}
.source-mode-control span{min-height:72px}
.exam-range select{width:100%}
.exam-data-note{margin:.75rem 0;padding:.8rem 1rem;border-radius:12px;background:var(--surface-soft,#eef4f7);font-size:.92rem;line-height:1.6}
.exam-year-field{margin-top:1rem}.exam-year-checklist{max-height:230px;overflow:auto}
.is-disabled{opacity:.45;pointer-events:none}
.exam-passage-panel{margin:0 0 1.2rem;padding:1rem 1.1rem;max-height:38vh;overflow:auto;border:1px solid var(--border,#ccd8df);border-radius:14px;background:var(--surface-soft,#f5f8fa);white-space:pre-wrap;line-height:1.75;text-align:left}
.exam-passage-heading{font-weight:800;margin-bottom:.55rem;color:var(--primary,#17324d)}
.exam-answer-option{display:grid!important;grid-template-columns:2.1rem 1fr;align-items:start;text-align:left;gap:.65rem}
.exam-option-key{display:inline-grid;place-items:center;width:1.8rem;height:1.8rem;border-radius:50%;font-weight:800;background:var(--surface-soft,#eef4f7)}
.exam-answer-option .option-label{line-height:1.55}
@media(max-width:720px){.source-mode-control{grid-template-columns:1fr!important}.exam-passage-panel{max-height:44vh}}

/* v2.4.1 跨年度考古題模式 */
.exam-cross-year-toggle{display:flex;align-items:flex-start;gap:.7rem;padding:.85rem 1rem;margin:.8rem 0;border:1px solid var(--line,#d8dee8);border-radius:12px;background:var(--surface-soft,#f7f9fc);cursor:pointer}
.exam-cross-year-toggle input{margin-top:.25rem;transform:scale(1.15)}
.exam-cross-year-toggle span{display:flex;flex-direction:column;gap:.2rem}
.exam-cross-year-toggle small{color:var(--muted,#667085);line-height:1.45}


/* Grammar mode v1 */
.source-mode-control{grid-template-columns:repeat(3,minmax(0,1fr));}
.grammar-catalog{display:grid;gap:1rem;}
.grammar-group{border:1px solid var(--line,#d8e0e8);border-radius:14px;padding:1rem;background:var(--surface,#fff);}
.grammar-group h3{margin:0 0 .75rem;font-size:1rem;}
.grammar-unit-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem;}
.grammar-unit-card{display:block;cursor:pointer;}
.grammar-unit-card input{position:absolute;opacity:0;pointer-events:none;}
.grammar-unit-card span{display:grid;grid-template-columns:1fr auto;gap:.25rem .5rem;padding:.75rem;border:1px solid var(--line,#d8e0e8);border-radius:12px;min-height:84px;}
.grammar-unit-card input:checked+span{border-color:var(--accent,#176b87);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent,#176b87) 18%,transparent);background:color-mix(in srgb,var(--accent,#176b87) 7%,transparent);}
.grammar-unit-card small{grid-column:1/-1;line-height:1.45;color:var(--muted,#607080);}
.grammar-unit-card em{font-style:normal;font-size:.78rem;color:var(--muted,#607080);}
.grammar-level{font-size:.72rem;padding:.18rem .48rem;border-radius:999px;align-self:start;white-space:nowrap;}
.grammar-level.junior{background:#e8f5e9;color:#236b2d}.grammar-level.senior{background:#ede7f6;color:#5b3b88}.grammar-level.both{background:#e3f2fd;color:#235f8b}
.grammar-quick-actions{display:flex;flex-wrap:wrap;gap:.5rem;margin:.5rem 0 1rem}.grammar-quick-actions button{border:1px solid var(--line,#d8e0e8);background:var(--surface,#fff);border-radius:999px;padding:.55rem .8rem;cursor:pointer}
.feedback-panel p{margin:.45rem 0 0;line-height:1.5}
@media(max-width:760px){.grammar-unit-grid{grid-template-columns:1fr}.source-mode-control{grid-template-columns:1fr}.grammar-unit-card span{min-height:auto}}

.exam-source-panel{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:12px 0;padding:12px 14px;border:1px solid var(--border,#d8dee9);border-radius:12px;background:var(--surface-soft,#f7f9fc)}
.exam-source-panel[hidden]{display:none}.exam-source-panel div{display:flex;flex-direction:column;gap:3px}.exam-source-panel small{line-height:1.45;opacity:.78}.exam-source-link{display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;padding:9px 12px;border-radius:10px;text-decoration:none;font-weight:700;background:var(--primary,#315efb);color:#fff}@media(max-width:640px){.exam-source-panel{align-items:stretch;flex-direction:column}.exam-source-link{width:100%}}

/* Grammar formula / pattern review */
.grammar-patterns{display:flex;flex-wrap:wrap;gap:.35rem;margin:.55rem 0 .2rem}
.grammar-patterns code{display:inline-flex;align-items:center;padding:.28rem .48rem;border:1px solid color-mix(in srgb,var(--accent,#1683a8) 24%,transparent);border-radius:.45rem;background:color-mix(in srgb,var(--accent,#1683a8) 8%,var(--surface,#fff));font-size:.78rem;font-weight:700;line-height:1.35;white-space:normal;color:var(--text,#16324a)}
.quiz-pattern-hint{display:block;margin-top:.45rem;padding:.48rem .65rem;border-left:4px solid var(--accent,#1683a8);border-radius:.35rem;background:color-mix(in srgb,var(--accent,#1683a8) 8%,transparent);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.88rem;line-height:1.55}
.review-pattern{margin:.35rem 0;padding:.3rem .5rem;border-radius:.35rem;background:color-mix(in srgb,var(--accent,#1683a8) 7%,transparent);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.78rem}
@media (max-width:640px){.grammar-patterns code{font-size:.72rem}.quiz-pattern-hint{font-size:.8rem}}