:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #1f2937;
  --ink: #182238;
  --muted: #687386;
  --line: #e2e7ef;
  --primary: #176f75;
  --primary-dark: #105b61;
  --soft-primary: #e7f3f3;
  --danger: #a33c3c;
  --status-progress: #916d08;
  --status-completed: #222222;
  --status-pending: #687386;
}

* { box-sizing: border-box; }
/* Reserve the scrollbar lane so switching between long/short subject hubs cannot shift the page. */
html { scrollbar-gutter: stable; }
body { min-height: 100vh; margin: 0; background: #f5f7fb; }
button, input { font: inherit; }
a { color: inherit; }

.site-header {
  height: 68px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.96);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--primary); color: white; }
.brand-wordmark { display: grid; gap: 4px; white-space: nowrap; }
.brand-wordmark strong { font-size: 21px; line-height: 1.05; letter-spacing: .08em; }
.brand-wordmark small { color: var(--primary); font-size: 9px; line-height: 1; font-weight: 600; letter-spacing: .16em; }
.header-actions { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.header-actions a, .text-button { color: var(--muted); text-decoration: none; }
.header-actions form { margin: 0; }
.text-button { padding: 0; border: 0; background: none; cursor: pointer; }
.user-name { color: var(--ink); font-weight: 700; }
.subject-navigation, .account-navigation { display: flex; align-items: center; gap: 20px; white-space: nowrap; }
.account-navigation { padding-left: 20px; border-left: 1px solid var(--line); }
.header-actions .subject-navigation a, .header-actions .account-navigation a { display: inline-block; }
.account-navigation .user-name { display: inline; }
@media (max-width: 760px) {
  body > .site-header { height: auto; min-height: 68px; flex-wrap: wrap; gap: 16px; padding-top: 16px; padding-bottom: 16px; }
  .site-header .header-actions { width: 100%; flex-wrap: wrap; gap: 16px; }
  .subject-navigation { width: 100%; justify-content: space-between; gap: 12px; }
  .account-navigation { margin-left: auto; padding-left: 0; border-left: 0; gap: 16px; }
}

.landing-shell, .auth-shell { min-height: calc(100vh - 68px); display: grid; place-items: center; padding: 40px 20px; }
.landing-shell { background: radial-gradient(circle at 15% 15%, #dceeed, transparent 35%), radial-gradient(circle at 90% 20%, #e8edf9, transparent 32%); }
.hero-card, .auth-card, .detail-card { width: min(760px, 100%); padding: 56px; border: 1px solid var(--line); border-radius: 24px; background: white; box-shadow: 0 24px 70px rgba(29,42,67,.09); }
.hero-card h1 { max-width: 650px; margin: 0; color: var(--ink); font-size: clamp(40px, 6vw, 68px); line-height: 1.1; }
.eyebrow { margin: 0 0 14px; color: var(--primary); font-size: 12px; font-weight: 800; letter-spacing: .17em; }
.lede, .detail-description, .muted { color: var(--muted); line-height: 1.75; }
.lede { margin: 24px 0 34px; max-width: 590px; font-size: 18px; }
.primary-button, .secondary-button { display: inline-flex; justify-content: center; padding: 13px 20px; border-radius: 10px; border: 1px solid transparent; font-weight: 750; text-decoration: none; cursor: pointer; }
.primary-button { background: var(--primary); color: white; }
.primary-button:hover { background: var(--primary-dark); }
.primary-button:disabled { background: #a9b5bc; cursor: not-allowed; }
.secondary-button { border-color: #aab7c3; background: white; color: var(--ink); }
.full-width { width: 100%; }

.auth-card { max-width: 460px; padding: 42px; }
.auth-card h1 { margin: 0 0 8px; }
.login-page > .login-header { position: absolute; top: 0; left: 0; width: 100%; height: 68px; padding: 0 24px; }
.login-page .auth-shell { min-height: 100vh; min-height: 100dvh; padding: 92px 20px 156px; }
.stack-form { display: grid; gap: 20px; margin-top: 28px; }
.stack-form label { display: grid; gap: 8px; color: #3e4859; font-size: 14px; font-weight: 700; }
.stack-form input { width: 100%; padding: 13px 14px; border: 1px solid #cfd6e0; border-radius: 9px; background: #fff; outline: none; }
.stack-form input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(23,111,117,.12); }
.alert { padding: 12px 15px; border-radius: 9px; font-size: 14px; }
.alert-error { border: 1px solid #f0caca; background: #fff3f3; color: var(--danger); }

.page-shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 56px 0 80px; }
.narrow-shell { max-width: 820px; }
.page-heading { display: flex; justify-content: space-between; margin-bottom: 32px; }
.page-heading h1, .detail-card h1 { margin: 0; color: var(--ink); }
.set-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.set-card { display: block; min-height: 220px; padding: 28px; border: 1px solid var(--line); border-radius: 18px; background: white; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
.set-card:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(29,42,67,.10); }
.set-card h2 { margin: 18px 0 10px; }
.set-card p { color: var(--muted); line-height: 1.65; }
.set-tag, .mode-chip { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: var(--soft-primary); color: var(--primary-dark); font-size: 12px; font-weight: 750; }
.set-meta { display: flex; justify-content: space-between; margin-top: 28px; color: var(--primary); font-weight: 750; }
.empty-state { padding: 70px 30px; text-align: center; border: 1px dashed #cad2df; border-radius: 18px; background: white; color: var(--muted); }
.back-link { display: inline-block; margin-bottom: 20px; color: var(--muted); text-decoration: none; }
.detail-card { padding: 48px; }
.detail-card h1 { margin-top: 18px; }
.detail-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 32px 0; }
.detail-stats div { padding: 16px; border-radius: 12px; background: #f6f8fb; }
.detail-stats dt { color: var(--muted); font-size: 12px; }
.detail-stats dd { margin: 7px 0 0; font-weight: 750; }
.mode-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.exam-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 60px; }
.exam-topline { display: flex; justify-content: space-between; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; }
.exam-topline > div { display: flex; align-items: center; gap: 12px; }
.exam-topline strong { color: var(--ink); }
.progress-track { height: 4px; margin: 16px 0 24px; overflow: hidden; border-radius: 99px; background: #e4e9ef; }
.progress-track span { display: block; height: 100%; background: var(--primary); }
.question-card { min-height: 650px; padding: 42px 48px 38px; border: 1px solid var(--line); border-radius: 18px; background: white; box-shadow: 0 18px 50px rgba(29,42,67,.07); }
.question-card h1 { margin: 0 0 54px; text-align: center; font-size: clamp(26px, 4vw, 36px); }
.dialogue-row { display: grid; grid-template-columns: 64px 1fr; align-items: center; gap: 24px; max-width: 980px; margin: 0 auto 28px; }
.dialogue-row p { font-size: clamp(17px, 2vw, 21px); line-height: 1.65; }
.speaker-avatar { display: grid; place-items: center; width: 60px; height: 60px; border: 3px solid #b9dada; border-radius: 50%; color: white; font-weight: 850; box-shadow: inset 0 0 0 3px white; }
.speaker-a { background: #355f78; }
.speaker-b { background: #9c5b63; }
.answer-row { min-height: 100px; }
.answer-zone { min-height: 70px; display: flex; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 20px; }
.answer-tokens { min-height: 48px; display: flex; align-items: center; flex-wrap: wrap; gap: 9px; }
.answer-slot { width: 72px; height: 38px; border-bottom: 2px solid #697386; }
.sentence-affix { white-space: pre-wrap; }
.sentence-slot { display: inline-flex; align-items: center; min-height: 48px; border-radius: 8px; }
.sentence-slot .answer-slot { background: transparent; border: 0; border-bottom: 2px solid #697386; cursor: pointer; }
.sentence-slot .selected-slot { background: #e7f3f3; border-bottom-color: var(--primary); }
.sentence-slot.drop-target { outline: 2px dashed var(--primary); background: #e7f3f3; }
.sentence-slot .word-token { white-space: nowrap; font-size: 18px; }
button:focus-visible { outline: 3px solid #30858b; outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.word-bank-wrap { max-width: 780px; margin: 54px auto 0; padding-top: 28px; border-top: 1px solid var(--line); }
.helper-text { margin: 0 0 18px; text-align: center; color: var(--muted); font-size: 13px; }
.word-bank { min-height: 62px; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 14px; }
.word-token { min-width: 58px; padding: 10px 15px; border-radius: 9px; cursor: grab; user-select: none; transition: transform .12s ease, box-shadow .12s ease; }
.word-token:hover { transform: translateY(-2px); }
.word-token-bank { border: 1px solid #cbd3de; background: white; color: #263143; box-shadow: 0 3px 9px rgba(30,45,70,.06); }
.word-token-answer { border: 1px solid #b7d5d5; background: var(--soft-primary); color: var(--primary-dark); font-weight: 700; }
.word-token.dragging { opacity: .35; }
.feedback { max-width: 780px; margin: 10px auto 0; }
.exam-submit { display: flex; justify-content: flex-end; max-width: 780px; margin: 34px auto 0; }

.completion-card { text-align: center; }
.completion-mark { display: grid; place-items: center; width: 64px; height: 64px; margin: 0 auto 24px; border-radius: 50%; background: #e5f5eb; color: #187044; font-size: 30px; font-weight: 900; }
.submission-summary { margin: 28px 0; border: 1px solid var(--line); border-radius: 12px; text-align: left; }
.submission-summary div { display: flex; justify-content: space-between; padding: 13px 16px; border-bottom: 1px solid var(--line); }
.submission-summary div:last-child { border-bottom: 0; }
.correct { color: #187044; }
.incorrect { color: var(--danger); }

@media (max-width: 700px) {
  .site-header { padding: 0 16px; }
  .user-name { display: none; }
  .hero-card, .auth-card, .detail-card { padding: 32px 24px; }
  .detail-stats { grid-template-columns: 1fr; }
  .question-card { min-height: 0; padding: 30px 20px; }
  .question-card h1 { margin-bottom: 36px; }
  .dialogue-row { grid-template-columns: 46px 1fr; gap: 14px; }
  .speaker-avatar { width: 44px; height: 44px; }
  .answer-slot { width: 46px; }
  .exam-topline strong { display: none; }
}

/* Keep controls in view at laptop heights and browser zoom. Only the question
   content scrolls when space is tight; the word bank and actions stay below it. */
.exam-shell { height: calc(100dvh - 68px); min-height: 380px; padding: 14px 0 16px; display: flex; flex-direction: column; }
.exam-topline { flex-shrink: 0; gap: 10px; }
.exam-counters { white-space: nowrap; }
.countdown { font-variant-numeric: tabular-nums; font-weight: 800; color: var(--primary-dark); padding: 6px 10px; background: var(--soft-primary); border-radius: 8px; }
.countdown.time-low { color: #a33c3c; background: #fff0ed; }
.progress-track { flex-shrink: 0; margin: 10px 0 12px; }
.question-card { min-height: 0; flex: 1; display: flex; flex-direction: column; padding: 22px 30px 0; overflow: hidden; }
.question-content { min-height: 90px; flex: 1; overflow: auto; overscroll-behavior: contain; padding: 4px; }
.single-question-heading { display: grid; grid-template-columns: 76px minmax(0, 1fr) 76px; align-items: center; gap: 12px; margin-bottom: clamp(12px, 3vh, 30px); }
.question-card .single-question-heading h1 { margin: 0; }
.single-question-heading .single-return-button { justify-self: start; width: auto; min-width: 64px; padding: 8px 14px; font-size: 14px; }
@media (max-width: 600px) {
  .single-question-heading { grid-template-columns: 1fr; gap: 10px; }
}
.question-card h1 { font-size: clamp(20px, 2.3vw, 29px); margin: 0 0 clamp(12px, 3vh, 30px); }
.dialogue-row { grid-template-columns: 46px minmax(0, 1fr); gap: 16px; margin: 0 auto 14px; }
.dialogue-row p { font-size: clamp(16px, 1.6vw, 20px); line-height: 1.5; margin: 8px 0; }
.speaker-avatar { width: 44px; height: 44px; }
.answer-row { min-height: 58px; }
.answer-zone { min-height: 50px; gap: 7px; font-size: 18px; }
.sentence-slot { min-height: 40px; max-width: 100%; }
.sentence-slot .word-token { font-size: 16px; white-space: normal; }
.answer-slot { width: 60px; height: 32px; }
.word-bank-wrap { flex-shrink: 0; width: 100%; max-width: 100%; margin: 8px auto 0; padding: 12px 4px 8px; max-height: 38%; overflow: auto; }
.helper-text { margin-bottom: 9px; font-size: 12px; line-height: 1.5; }
.word-bank { min-height: 42px; gap: 8px; }
.word-token { min-width: 44px; max-width: 100%; overflow-wrap: anywhere; padding: 8px 11px; }
.exam-submit { flex-shrink: 0; width: 100%; max-width: none; margin: 0; padding: 12px 0; gap: 12px; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); background: white; }
.exam-buttons { display: flex; gap: 8px; flex-shrink: 0; }
.exam-buttons button { padding: 10px 14px; }
.save-status { color: var(--muted); font-size: 12px; line-height: 1.4; }
.bank-banner { display: flex; justify-content: space-between; align-items: center; gap: 15px; background: var(--soft-primary); border: 1px solid #c8dfe0; border-radius: 16px; padding: 22px; margin-bottom: 24px; color: var(--primary-dark); text-decoration: none; }
.bank-banner p { margin-bottom: 0; font-size: 14px; }
.bank-shell { padding-top: 28px; }
.bank-search { padding: 20px; background: white; border: 1px solid var(--line); border-radius: 14px; }
.bank-search label { display: block; font-weight: 700; margin-bottom: 10px; }
.search-controls { display: flex; flex-wrap: wrap; gap: 10px; }
.search-controls input { flex: 1; min-width: 180px; }
.search-controls input, .search-controls select { font: inherit; padding: 12px; border: 1px solid #cbd3de; border-radius: 9px; background: white; }
.bank-search .muted { font-size: 13px; margin-bottom: 0; }
.bank-list { display: grid; gap: 16px; }
.bank-card { padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.bank-card-heading, .bank-card-footer { display: flex; align-items: center; justify-content: space-between; gap: 15px; font-size: 13px; }
.bank-prompt { font-size: 18px; line-height: 1.6; }
.sentence-label { display: inline-block; color: var(--primary); font-weight: 800; margin-right: 12px; }
.bank-answer { padding: 12px 0; border-top: 1px solid var(--line); margin-bottom: 12px; line-height: 1.6; }
summary { cursor: pointer; color: var(--primary-dark); }
.bank-option { display: inline-block; margin: 3px; padding: 2px 8px; border: 1px solid var(--line); border-radius: 6px; }
.pagination { display: flex; justify-content: center; gap: 12px; margin-top: 24px; }
.review-shell .detail-card { width: 100%; }
.review-score { font-size: 24px; }
.review-score strong { font-size: 36px; color: var(--primary-dark); }
.review-list { border: 0; background: transparent; display: grid; gap: 16px; }
.review-card { background: white; padding: 24px; border: 1px solid var(--line); border-radius: 14px; line-height: 1.7; overflow-wrap: anywhere; }
.review-card header { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); font-size: 13px; }

/* T1 writing hub and D-inspired progress overview. */
.writing-hub { max-width: 1180px; padding-top: 28px; }
.writing-hero { padding: 24px 28px; margin-bottom: 24px; border: 1px solid #e3e2f1; border-radius: 16px; background: linear-gradient(135deg,#fff 55%,#f1effc); }
.writing-hero h1 { margin: 0 0 8px; font-size: 30px; }
.writing-hero p:last-child { margin-bottom: 0; color: var(--muted); }
.writing-tabs { margin: 0 0 28px; padding: 16px; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 18px 18px; background: #efeff7; }
.writing-tab { display: inline-flex; min-width: 280px; gap: 14px; align-items: center; padding: 12px 16px; border-radius: 11px; background: white; box-shadow: 0 4px 14px rgba(29,42,67,.08); }
.writing-tab b { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: #6657c8; color: white; }
.writing-tab span { display: grid; font-weight: 800; }.writing-tab small { color: var(--muted); font-weight: 500; }
.hub-heading,.set-summary,.set-card-actions,.review-title-row,.history-heading,.bank-workspace-header,.detail-heading { display: flex; justify-content: space-between; align-items: center; gap: 18px; }
.hub-heading h2 { margin-bottom: 4px; }.hub-heading p { margin: 0; }
.favorites-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.favorites-heading h1 { margin: 0; }
.favorites-heading .favorites-back { flex-shrink: 0; align-items: center; min-height: 44px; padding: 10px 20px; font-size: 14px; line-height: 1.5; white-space: nowrap; }
.favorites-heading .favorites-back:focus-visible { outline: 3px solid #8cc3c6; outline-offset: 3px; }
.hub-links { display: flex; gap: 18px; }.hub-links a,.text-link { border: 0; padding: 0; background: none; color: #5547b4; text-decoration: none; font: inherit; font-weight: 750; cursor: pointer; }
.set-count { margin-left: 8px; font-size: 12px; font-weight: 500; color: var(--muted); }
.writing-set-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-top: 14px; }
.writing-set-card { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 12px 10px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: white; }
.writing-set-card:hover { background: #fafcfd; }
.writing-set-card .set-title-link { text-decoration: none; font-size: 16px; }
.writing-set-card .set-title-link:hover { color: var(--primary); text-decoration: underline; }
.writing-set-card .question-chips { display: grid; grid-template-columns: repeat(10,minmax(0,1fr)); grid-column: 1 / -1; grid-row: 2; gap: 5px; margin: 0; }
.writing-set-card .question-chip { min-width: 0; height: 26px; padding: 0; border-radius: 6px; font-size: 10px; }
.writing-set-card .set-card-actions { grid-column: 2; grid-row: 1; gap: 10px; font-size: 12px; }
.writing-set-card .set-state { font-size: 12px; }
@media (min-width: 701px) and (max-width: 1099px) {
  .writing-set-list { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
.set-summary h3 { margin: 0 0 6px; }.set-state { margin: 0; font-size: 13px; color: var(--status-completed); }.set-state.in-progress { color: var(--status-progress); }.set-state.muted { color: var(--status-pending); }
.question-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.question-chip { display: inline-grid; place-items: center; min-width: 34px; height: 34px; padding: 0 7px; border: 1px solid #d8dde6; border-radius: 9px; background: white; color: #455064; font-size: 12px; font-weight: 800; text-decoration: none; }
.question-chip.correct { border-color: #c6dfd0; background: #eaf5ee; color: #277249; }
.question-chip.incorrect { border-color: #efcece; background: #fff0f0; color: #a13d3d; }
.question-chip.active { outline: 3px solid rgba(102,87,200,.22); border-color: #6657c8; }
.set-card-actions { justify-content: flex-end; min-height: 32px; }.set-card-actions form { margin: 0; }
.compact-button { padding: 9px 14px; font-size: 13px; }
.bookmark-button { white-space: nowrap; padding: 7px 10px; border: 1px solid #d7dce5; border-radius: 999px; background: white; color: #596477; cursor: pointer; font: inherit; font-size: 12px; }
.bookmark-button.bookmarked { border-color: #ead79d; background: #fff9df; color: #8b6500; }
.dialogue-row { grid-template-columns: 46px minmax(0,1fr) auto; }

/* One-question-at-a-time review. */
.compact-review { max-width: 920px; padding-top: 28px; }
.review-title-row { align-items: flex-end; margin-bottom: 24px; }.review-title-row h1 { margin: 0; }
.score-block { display: grid; text-align: right; }.score-block strong { color: #5547b4; font-size: 30px; }.score-block span { color: var(--muted); font-size: 13px; }
.review-panel { padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: white; box-shadow: 0 16px 44px rgba(29,42,67,.07); }
.review-index { padding-bottom: 14px; border-bottom: 1px solid var(--line); }.review-index > span { display: block; margin-bottom: 8px; color: var(--muted); font-size: 12px; font-weight: 700; }.review-index nav { display: flex; flex-wrap: wrap; gap: 8px; }
.single-review-card { margin-top: 14px; box-shadow: none; }.single-review-card header { align-items: center; justify-content: flex-start; }.single-review-card header strong { margin-left: auto; }
.answer-comparison { margin: 0; }.answer-comparison div { display: grid; grid-template-columns: 120px 1fr; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--line); }.answer-comparison dt { color: var(--muted); font-weight: 700; }.answer-comparison dd { margin: 0; }
.review-actions { display: flex; flex-wrap:wrap; gap: 10px; margin-top: 18px; }.review-actions form { margin: 0; }
.review-footer { margin-top: 18px; padding: 20px; border-radius: 14px; background: #efeff7; }.review-footer > p { margin-top: 0; color: var(--muted); }

/* Independent attempts, current wrong answers, and bookmarks. */
.history-shell { max-width: 900px; padding-top: 32px; }.history-heading h1 { margin: 0; }
.history-tabs { display: flex; gap: 8px; margin: 24px 0 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.history-tabs a { padding: 9px 15px; border-radius: 999px; color: var(--muted); text-decoration: none; font-weight: 750; }.history-tabs a.active { background: #eeeafd; color: #5547b4; }
.history-list { display: grid; gap: 10px; }.history-row,.history-question-row { display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 14px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: white; color: var(--ink); text-decoration: none; }
.history-row small { display: block; margin-top: 5px; color: var(--muted); }.history-row > b { padding: 7px 10px; border-radius: 999px; background: #eeeafd; color: #5547b4; }
.history-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; background: #eeeafd; color: #5547b4; font-weight: 850; }.history-mark.wrong { background: #fff0f0; color: var(--danger); }.history-mark.favorite { background: #fff9df; color: #8b6500; }
.history-question-row p { margin: 6px 0 0; color: var(--muted); }.row-actions { display: flex; gap: 12px; align-items: center; }.row-actions a { color: #5547b4; text-decoration: none; font-weight: 700; }.row-actions form { margin: 0; }

/* BankC-inspired filterable split-pane sentence library. */
.bank-workspace { width: min(1460px,calc(100% - 32px)); margin: 0 auto; padding: 22px 0 40px; }.bank-workspace-header h1 { margin: 0; }.bank-workspace-header p { margin: 4px 0 0; color: var(--muted); }
.t1-only-tabs { display: flex; margin: 18px 0; border-radius: 12px; background: #f0f2f5; }.t1-only-tabs span { width: 260px; padding: 11px; border-radius: 12px; text-align: center; }.t1-only-tabs .active { background: var(--primary); color: white; font-weight: 800; }
.bank-filter-bar { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px; padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: white; }.bank-filter-bar label { display: grid; gap: 5px; color: var(--muted); font-size: 11px; font-weight: 700; }.bank-filter-bar select,.bank-filter-bar input { height: 38px; padding: 0 10px; border: 1px solid #ccd4df; border-radius: 8px; background: white; color: var(--ink); font: inherit; font-size: 13px; }.bank-query-label { flex: 1; min-width: 260px; }
.bank-split { display: grid; grid-template-columns: minmax(350px,46%) minmax(420px,54%); min-height: 610px; margin-top: 14px; overflow: hidden; border: 1px solid var(--line); border-radius: 15px; background: white; }
.bank-result-pane { padding: 15px; border-right: 1px solid var(--line); background: #f8f9fb; }.result-count { color: var(--muted); font-size: 12px; }
.bank-result-pane .bank-list { max-height: 680px; overflow: auto; }.bank-result-pane .bank-card { display: block; padding: 14px; color: var(--ink); text-decoration: none; }.bank-result-pane .bank-card.selected { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(23,111,117,.10); }.bank-result-pane .bank-card strong { display: block; margin: 8px 0; font-size: 13px; }.bank-result-pane .bank-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.question-state,.frequency { display: inline-block; margin-right: 7px; padding: 3px 7px; border-radius: 999px; background: #edf0f4; color: #617083; font-size: 10px; }.question-state.correct { background: #eaf5ee; color: #277249; }.question-state.incorrect { background: #fff0f0; color: #a13d3d; }.favorite-star { color: #b88b09; }.frequency { float: right; }
.bank-detail-pane { padding: 28px; }.detail-heading { align-items: flex-start; border-bottom: 1px solid var(--line); padding-bottom: 18px; }.detail-heading h2 { margin: 10px 0 0; }
.bank-dialogue { display: grid; gap: 16px; margin: 28px 0; }.bank-dialogue p { display: grid; grid-template-columns: 36px 1fr; align-items: center; gap: 12px; margin: 0; font-size: 17px; line-height: 1.6; }.bank-dialogue p span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--soft-primary); color: var(--primary-dark); font-weight: 850; }
.bank-options { padding: 18px; border-radius: 12px; background: #f7f8fa; }.bank-options h3 { margin-top: 0; font-size: 13px; }.bank-options span { display: inline-block; margin: 4px; padding: 7px 10px; border: 1px solid #d3dae4; border-radius: 8px; background: white; }
.detail-practice-action { margin-top: 24px; }.empty-detail { display: grid; place-items: center; min-height: 400px; text-align: center; color: var(--muted); }

/* Review history rail and wrong-answer drills. */
.compact-review.has-session-history { max-width: 1180px; }
.review-layout { position: relative; display: block; padding-right: 266px; }
.compact-review:not(.has-session-history) .review-layout { display: block; }
.compact-review:not(.has-session-history) .review-layout { padding-right: 0; }
.session-history-rail { position: absolute; inset: 0 0 0 auto; display: flex; width: 250px; min-height: 0; overflow: hidden; flex-direction: column; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.session-history-rail h2 { margin: 0; font-size: 16px; }.session-history-rail > p { margin: 5px 0 14px; color: var(--muted); font-size: 12px; }
.session-history-rail nav { display: grid; min-height: 0; overflow: auto; flex: 1; align-content: start; gap: 8px; }
.session-history-rail a { display: grid; gap: 4px; padding: 11px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); text-decoration: none; }
.session-history-rail a:hover,.session-history-rail a.active { border-color: #6657c8; background: #f2efff; }.session-history-rail span { color: var(--muted); font-size: 12px; }
.review-choice-list { display: flex; flex-wrap: wrap; gap: 7px; }.review-choice-list span { padding: 5px 9px; border: 1px solid #d3dae4; border-radius: 8px; background: #f8f9fb; }
.wrong-drill-actions { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 8px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.wrong-drill-actions h2 { margin: 0 0 5px; font-size: 18px; }.wrong-drill-actions p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }.wrong-drill-actions form { flex-shrink: 0; }
.drill-mode-name { display: inline-block; margin: 0 4px; padding: 1px 7px; border-radius: 6px; background: var(--soft-primary); color: var(--primary-dark); font-weight: 900; }
.wrong-drill-copy { flex: 1; min-width: 0; max-width: 100%; }
.wrong-drill-actions .wrong-drill-description { white-space: nowrap; overflow-x: auto; scrollbar-width: thin; }
.wrong-drill-scope { white-space: nowrap; }
.wrong-drill-description:focus-visible { outline: 2px solid #8cc3c6; outline-offset: 3px; }
.single-retry-footer { text-align: center; }.single-retry-footer .mode-actions { justify-content: center; }.single-retry-footer .primary-button { min-width: 150px; }
.history-question-row small { color: var(--muted); }
@media (max-height: 700px) {
  .question-card { padding-top: 12px; }
  .question-card h1 { margin-bottom: 10px; font-size: 22px; }
  .dialogue-row { margin-bottom: 8px; }
  .word-bank-wrap { padding-top: 8px; }
}
@media (max-width: 700px) {
  .writing-set-list { grid-template-columns: minmax(0,1fr); }
  .writing-set-card { grid-template-columns: minmax(0,1fr) auto; gap: 12px; padding: 14px 16px; }
  .writing-set-card .question-chips { grid-column: 1 / -1; grid-row: 2; }
  .writing-set-card .set-card-actions { justify-content: flex-end; gap: 10px; }
  .writing-set-card .set-mode-link { display: none; }
  .hub-links { flex-wrap: wrap; gap: 14px; font-size: 13px; }
  .exam-shell { width: calc(100% - 16px); padding-top: 8px; padding-bottom: 8px; }
  .question-card { padding-left: 12px; padding-right: 12px; }
  .dialogue-row { grid-template-columns: 32px minmax(0, 1fr); gap: 8px; }
  .speaker-avatar { width: 30px; height: 30px; font-size: 12px; border-width: 2px; }
  .answer-slot { width: 42px; }
  .answer-zone { font-size: 16px; gap: 5px; }
  .exam-topline { font-size: 12px; }
  .exam-topline > div { gap: 6px; }
  .exam-submit { gap: 6px; flex-wrap: wrap; padding: 8px 0; }
  .save-status { width: 100%; font-size: 11px; }
  .exam-buttons { width: 100%; justify-content: flex-end; }
  .exam-buttons button { font-size: 13px; padding: 9px 10px; }
  .bank-banner, .bank-card-footer { flex-wrap: wrap; }
  .bank-card { padding: 18px; }
  .bank-card-heading { font-size: 11px; }
  .header-actions a { display: none; }
  .writing-hero { padding: 24px; }.writing-tab { min-width: 100%; }
  .hub-heading,.history-heading,.review-title-row { align-items: flex-start; flex-direction: column; }
  .set-summary { align-items: flex-start; }.set-card-actions { flex-wrap: wrap; }
  .dialogue-row { grid-template-columns: 32px minmax(0,1fr); }.dialogue-row .bookmark-form { grid-column: 2; }
  .answer-comparison div { grid-template-columns: 1fr; gap: 4px; }
  .history-question-row { grid-template-columns: 34px 1fr; }.row-actions { grid-column: 2; flex-wrap: wrap; }
  .bank-workspace { width: calc(100% - 16px); }.bank-split { display: block; }.bank-result-pane { border-right: 0; border-bottom: 1px solid var(--line); }.bank-result-pane .bank-list { max-height: 380px; }.bank-detail-pane { padding: 18px; }
  .review-layout { display: block; padding-right: 0; }.session-history-rail { position: static; width: auto; height: 360px; margin-top: 14px; }.session-history-rail nav { max-height: none; }
  .wrong-drill-actions { align-items: flex-start; flex-direction: column; }
}
.collection-tabs {display:flex;align-items:center;flex:none;width:min(1180px,calc(100vw - 40px));max-width:100%;gap:8px;padding:6px;background:var(--surface, #fff);border:1px solid #dce2ee;border-radius:14px;margin:24px auto 12px;}
.collection-tabs a {display:flex;align-items:center;justify-content:center;flex:1 1 0;min-width:0;height:44px;text-align:center;padding:4px 12px;border-radius:9px;text-decoration:none;font-size:16px;line-height:20px;font-weight:700;color:#64718b;}
.collection-tabs a.active {background:#176f76;color:#fff;box-shadow:0 2px 6px #176f7620;}
.collection-tabs a:focus-visible {outline:3px solid #8579ec;outline-offset:2px;}
.collection-description,.collection-label {color:#64718b;font-size:14px;line-height:1.5;}
.collection-description {margin:0 0 24px;}
.search-description {width:min(1180px,calc(100vw - 40px));max-width:100%;margin-left:auto;margin-right:auto;}
.wrong-workspace {max-width:1180px;}
.remove-dialog {width:min(460px,calc(100vw - 40px));padding:30px;border:1px solid #dce2ee;border-radius:20px;background:#fff;color:#202b3e;box-shadow:0 24px 80px #24334b30;}
.remove-dialog::backdrop {background:rgb(28 40 59 / 32%);backdrop-filter:blur(3px);}
.remove-dialog-tag {font-size:12px;font-weight:700;letter-spacing:1px;color:#176f76;}
.remove-dialog h2 {font-size:24px;line-height:1.4;margin:12px 0 16px;}
.remove-dialog p {font-size:15px;line-height:1.8;margin:0 0 14px;}
.remove-dialog strong {color:#aa3535;font-weight:600;}
.remove-dialog .remove-dialog-note {padding:14px 16px;border-radius:10px;background:#f5f7fa;color:#64718b;font-size:14px;}
.remove-dialog-actions {display:flex;justify-content:flex-end;gap:12px;margin-top:24px;}
.remove-dialog-actions button {min-width:100px;}
.wrong-confirm-preference {display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px;cursor:pointer;}
.wrong-confirm-preference input {accent-color:var(--primary);width:16px;height:16px;}
.unified-workspace {width:min(1180px,calc(100% - 40px));max-width:1180px;margin:0 auto;padding:28px 0 80px;}
.mode-tools {justify-content:flex-end;display:flex;margin:0 0 24px;}
.wrong-row {grid-template-columns:38px minmax(0,1fr);}
.wrong-row .row-actions {grid-column:2;flex-wrap:wrap;gap:12px;}
.wrong-row.paused {background:#f8f9fb;}
.wrong-workspace .history-list {grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;}
.wrong-workspace .wrong-drill-actions,.wrong-workspace .empty-state {grid-column:1 / -1;}
.wrong-workspace .wrong-row {align-items:start;grid-template-columns:30px minmax(0,1fr);gap:8px 12px;padding:14px 18px;border-radius:16px;box-shadow:0 3px 12px #23354b04;}
.wrong-row .history-mark {width:30px;height:30px;}
.wrong-row strong {display:block;font-size:13px;line-height:1.6;color:#64718b;font-weight:600;}
.wrong-workspace .wrong-row p {font-size:16px;line-height:1.55;color:#263449;margin:4px 0 6px;overflow-wrap:anywhere;}
.wrong-row small {font-size:12px;}
.wrong-workspace .wrong-row .row-actions {grid-column:1 / -1;align-self:end;border-top:1px solid #edf0f5;padding-top:8px;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 10px;}
.wrong-row .row-actions a,.wrong-row .row-actions button {display:flex;align-items:center;justify-content:flex-start;min-height:24px;padding:0;margin:0;font-family:inherit;font-size:12px;line-height:20px;text-align:left;white-space:nowrap;}
.wrong-row .row-actions form {display:flex;align-items:center;text-align:left;flex:0 0 auto;}
.wrong-row .row-actions a {color:#64718b;font-weight:500;}
.wrong-row .row-actions form:nth-child(2) button {color:#64718b;font-weight:500;}
.wrong-row .row-actions form:nth-child(3) button {color:#64718b;font-weight:500;}
.wrong-row .row-actions form:last-child button {color:#aa3535;font-weight:500;}
@media(max-width:1050px) {.wrong-workspace .history-list {grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:700px) {.wrong-workspace .history-list {grid-template-columns:minmax(0,1fr);}.wrong-workspace .wrong-row {padding:12px 14px;}}
.paused-note {display:inline-block;color:#876420;background:#fff3d5;border-radius:5px;padding:2px 6px;margin-left:8px;}
.danger-link {color:#aa3535;}
.wrong-card-actions {flex-wrap:wrap;gap:12px;border-top:1px solid var(--line);padding-top:12px;}
.wrong-card-actions form {margin:0;}
.wrong-card-actions .text-link {font-size:13px;white-space:nowrap;}
.writing-set-card:has(> .wrong-card-actions) {grid-template-columns:minmax(0,1fr);}
.writing-set-card > .wrong-card-actions {grid-column:1 / -1;grid-row:3;justify-content:flex-start;}
.listening-card-bottom:has(.wrong-card-actions) {grid-template-columns:minmax(0,1fr);}
.listening-card-bottom .wrong-card-actions {border-top:0;padding-top:0;}
.wrong-card-actions button.text-link,.wrong-row .row-actions button.text-link {color:var(--primary-dark);}
.wrong-card-actions button.danger-link,.wrong-row .row-actions form:last-child button {color:var(--danger);}
.text-link:disabled {opacity:.5;cursor:not-allowed;}
@media(max-width:540px) {.collection-tabs a {padding:4px 2px;font-size:12.5px;line-height:18px;}.collection-tabs {gap:3px;}.wrong-row .row-actions {grid-column:1 / -1;}.wrong-row .row-actions a,.wrong-row .row-actions button {min-height:36px;}}
.collection-tabs.collection-tabs-three { grid-template-columns:repeat(3,minmax(0,1fr)); }
.reading-pagination { display:flex;justify-content:center;gap:32px;margin-top:32px; }
.subject-hero{display:flex;align-items:center;justify-content:space-between;gap:28px;min-height:160px}.subject-hero h1{margin-bottom:0}.subject-type-tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}.subject-type-tabs a{padding:12px 18px;border:1px solid #dce5ed;border-radius:10px;color:#5b6e80;text-decoration:none;background:#ffffffb0;font-weight:650}.subject-type-tabs a.active{color:#176f76;border-color:#176f76;background:#eaf5f5}.writing-hub .collection-description{display:none}@media(max-width:720px){.subject-hero{align-items:flex-start;flex-direction:column;gap:20px}.subject-type-tabs{justify-content:flex-start}.subject-type-tabs a{padding:10px 13px}}