:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --text: #111827;
  --muted: #667085;
  --subtle: #94a3b8;
  --border: #e2e8f0;
  --line: #e2e8f0;
  --border-strong: #cbd5e1;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eff6ff;
  --danger: #dc2626;
  --danger-soft: #fff1f2;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 26px rgba(15, 23, 42, 0.05);
  --radius: 20px;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% -10%, rgba(37, 99, 235, 0.10), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, #f4f7fb 36%, #eef3f9 100%);
  color: var(--text);
}

button, input, select, textarea { font: inherit; }
button {
  border: 0;
  background: var(--primary);
  color: #fff;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 800;
  letter-spacing: .01em;
  box-shadow: 0 8px 18px rgba(37, 99, 235, .18);
  transition: background .15s ease, transform .15s ease, box-shadow .15s ease;
}
button:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 12px 24px rgba(37, 99, 235, .22); }
button:disabled { opacity: .48; cursor: not-allowed; transform: none; box-shadow: none; }
button.ghost { background: var(--primary-soft); color: var(--primary); box-shadow: none; }
button.ghost:hover { background: #dbeafe; box-shadow: none; }
button.danger { background: var(--danger); box-shadow: 0 8px 18px rgba(220, 38, 38, .16); }
button.danger.ghost { color: var(--danger); background: var(--danger-soft); box-shadow: none; }

input, select, textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .10);
}
textarea { min-height: 180px; resize: vertical; }

.app-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.sidebar {
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  color: #fff;
  padding: 22px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,.06);
}
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.mobile-menu-btn { display: none; }
.brand-icon {
  width: 48px; height: 48px; display: grid; place-items: center;
  border-radius: 16px; background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  font-weight: 900; font-size: 23px; box-shadow: 0 12px 30px rgba(37, 99, 235, .28);
}
.brand h1 { margin: 0; font-size: 21px; letter-spacing: .02em; }
.brand p { margin: 4px 0 0; color: #cbd5e1; font-size: 13px; }
.nav { display: grid; gap: 10px; }
.nav-btn {
  width: 100%; text-align: left; background: transparent; color: #cbd5e1;
  border: 1px solid rgba(255,255,255,.08); box-shadow: none;
}
.nav-btn:hover, .nav-btn.active {
  background: rgba(37, 99, 235, .24); color: #fff; border-color: rgba(96, 165, 250, .38); box-shadow: none;
}
.side-card {
  margin-top: 24px; padding: 16px; border-radius: 18px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.10);
}
.mini-stat { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.09); }
.mini-stat:last-child { border-bottom: 0; }
.mini-stat span { color: #cbd5e1; }
.mini-stat strong { font-size: 18px; }
.account-card { display: grid; gap: 10px; }
.bank-switcher { display: grid; gap: 8px; }
.bank-switcher label, .bank-manager-grid label { display: grid; gap: 6px; font-size: 12px; font-weight: 800; }
.bank-switcher p { margin: 0; color: #cbd5e1; font-size: 12px; }
.bank-manager-grid {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(220px, 1fr) auto;
  gap: 14px;
  align-items: end;
}
.account-card label { display: grid; gap: 6px; color: #cbd5e1; font-size: 12px; font-weight: 800; }
.account-card input, .account-card select { min-height: 40px; }
.account-card button { width: 100%; }
.account-card p { margin: 0; color: #cbd5e1; font-size: 12px; line-height: 1.5; overflow-wrap: anywhere; }
.account-card .config-hint { color: #fde68a; }
.account-card .inline-check { display: flex; align-items: center; gap: 8px; }
.account-card .inline-check input { min-height: auto; width: auto; }
.is-loading button { cursor: progress; }

.main { padding: 28px; min-width: 0; }
.topbar {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 18px;
  margin-bottom: 22px;
}
.topbar h2 { margin: 0; font-size: 30px; line-height: 1.2; }
.topbar p { margin: 8px 0 0; color: var(--muted); }
.top-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: rgba(255,255,255,.94);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 22px;
  margin-bottom: 18px;
  backdrop-filter: blur(6px);
}
.card > h3, .exam-setup h3 { margin-top: 0; }

.toolbar {
  display: grid;
  grid-template-columns: minmax(130px, .8fr) minmax(160px, 1fr) minmax(130px, .7fr) minmax(130px, .7fr) minmax(200px, 1.25fr) auto;
  gap: 14px;
  align-items: end;
}
.toolbar label, .form-grid label {
  color: var(--muted); font-size: 13px; display: grid; gap: 7px; font-weight: 800;
}
.toolbar button { height: 44px; }

.question-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 18px; }
.question-meta { display: flex; flex-wrap: wrap; gap: 8px; color: var(--muted); margin-bottom: 12px; }
.question-meta span, .pill, .tag {
  padding: 5px 10px; border-radius: 999px; background: #eef2ff; color: #3730a3; font-size: 12px; font-weight: 900;
}
.question-card h3, .exam-running h3 { font-size: 21px; line-height: 1.58; margin: 10px 0 18px; }
.options { display: grid; gap: 10px; }
.option {
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 14px 15px;
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  cursor: pointer;
  background: #fff;
  line-height: 1.55;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.option:hover { border-color: #93c5fd; background: #fbfdff; }
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option.correct { border-color: #86efac; background: var(--success-soft); }
.option.wrong { border-color: #fecdd3; background: var(--danger-soft); }
.option-key { font-weight: 900; color: var(--primary); }
.option-key {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: #fff;
}
.option.selected .option-key { color: #fff; background: var(--primary); border-color: var(--primary); }
.option.correct .option-key { color: #fff; background: var(--success); border-color: var(--success); }
.option.wrong .option-key { color: #fff; background: var(--danger); border-color: var(--danger); }
.answer-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.answer-panel { margin-top: 16px; padding: 16px; border-radius: 14px; background: #f8fafc; border: 1px solid var(--border); line-height: 1.7; }
.answer-panel.correct { border-color: #86efac; background: var(--success-soft); }
.answer-panel.wrong { border-color: #fecdd3; background: var(--danger-soft); }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.question-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.grid-btn {
  width: 34px; height: 34px; min-height: 34px; padding: 0; border-radius: 10px;
  background: #f1f5f9; color: var(--text); border: 1px solid var(--border); box-shadow: none;
}
.grid-btn:hover { box-shadow: none; }
.grid-btn.current { background: var(--primary); color: #fff; border-color: var(--primary); }
.grid-btn.done { background: #dcfce7; color: #166534; border-color: #86efac; }
.grid-btn.wrong { background: #ffe4e6; color: #be123c; border-color: #fecdd3; }
.tip { margin-top: 18px; padding: 12px; border-radius: 12px; background: #f8fafc; color: var(--muted); font-size: 13px; line-height: 1.6; }

.exam-setup {
  max-width: 1180px;
  border-color: #dbeafe;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}
.form-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) minmax(180px, 1fr) minmax(150px, .7fr) minmax(150px, .7fr);
  gap: 16px;
  margin: 16px 0 10px;
  align-items: end;
}
.range-hint {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 8px 12px;
  margin: 2px 0 18px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: #1e40af;
  font-size: 13px;
  font-weight: 700;
}
.exam-header, .section-head { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.timer { font-size: 24px; font-weight: 900; color: var(--danger); }

.import-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.sample-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.code-block { background: #0f172a; color: #dbeafe; padding: 16px; border-radius: 14px; overflow-x: auto; line-height: 1.65; }

.list { display: grid; gap: 12px; }
.list-item { border: 1px solid var(--border); border-radius: 16px; padding: 15px; background: #fff; }
.list-item h4 { margin: 0 0 8px; line-height: 1.5; }
.list-item p { margin: 6px 0; line-height: 1.65; }
.list-item.compact { display: grid; gap: 6px; }
.list-row { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; }
.list-row-main { min-width: 0; }
.list-row-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 14px; }
.stat-card { padding: 16px; border-radius: 16px; background: #f8fafc; border: 1px solid var(--border); }
.stat-card span { color: var(--muted); font-size: 13px; font-weight: 800; }
.stat-card strong { display: block; margin-top: 8px; font-size: 26px; }
.diagnostic-card strong { font-size: 17px; overflow-wrap: anywhere; }
.diagnostic-card.ok { border-color: #86efac; background: var(--success-soft); }
.diagnostic-card.bad { border-color: #fecdd3; background: var(--danger-soft); }
.stats-two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; }
.weak-badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 72px; padding: 5px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 900;
}
.weak-badge.critical { background: var(--danger-soft); color: #be123c; }
.weak-badge.warning { background: var(--warning-soft); color: #92400e; }
.weak-badge.review { background: var(--primary-soft); color: #1d4ed8; }
.progress-line {
  height: 8px; border-radius: 999px; background: #e5e7eb; overflow: hidden; margin-top: 10px;
}
.progress-line > span { display: block; height: 100%; background: linear-gradient(90deg, #2563eb, #60a5fa); border-radius: inherit; }

.saved-exam-box {
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  border-radius: 14px;
  padding: 14px;
  margin: 6px 0 16px;
  line-height: 1.6;
}
.saved-exam-title { font-weight: 900; margin-bottom: 6px; }
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .50);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 20;
}
.modal-card {
  width: min(520px, 100%);
  background: #fff;
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 22px;
}
.modal-card h3 { margin: 0 0 10px; }
.modal-card p { margin: 0 0 14px; line-height: 1.6; }
.toast {
  position: fixed; right: 20px; bottom: 20px; background: #0f172a; color: #fff;
  padding: 12px 16px; border-radius: 14px; box-shadow: var(--shadow); max-width: 360px; z-index: 30;
}
.result-good { color: var(--success); font-weight: 900; }
.result-bad { color: var(--danger); font-weight: 900; }

@media (max-width: 1100px) {
  .toolbar { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .toolbar button { width: fit-content; }
  .question-layout, .stats-two-col { grid-template-columns: 1fr; }
}
@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .main { padding: 18px; }
  .toolbar, .import-grid, .form-grid, .stats-grid { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; }
}

@media (max-width: 767px) {
  body { padding-bottom: 0; overflow-x: hidden; }
  .app-shell { display: block; }
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 19;
    height: auto;
    padding: 10px 14px;
    overflow: visible;
  }
  .brand { margin-bottom: 0; }
  .brand-icon { width: 42px; height: 42px; border-radius: 13px; }
  .brand h1 { font-size: 18px; }
  .brand p { font-size: 12px; }
  .mobile-menu-btn {
    display: block;
    min-height: 40px;
    margin-left: auto;
    padding: 8px 14px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.18);
    box-shadow: none;
  }
  .sidebar > .side-card:not(.account-card) { display: none; }
  .sidebar.menu-open .bank-switcher { display: grid; }
  .account-card { display: none; margin-top: 12px; grid-template-columns: 1fr 1fr; }
  .sidebar.menu-open .account-card { display: grid; }
  .account-card label:first-child,
  .account-card p,
  .account-card .config-hint { grid-column: 1 / -1; }
  .nav {
    display: none;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,.12);
  }
  .sidebar.menu-open .nav { display: grid; }
  .nav-btn {
    min-height: 42px;
    padding: 8px 10px;
    text-align: center;
    font-size: 13px;
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 10px;
  }
  .main { padding: 14px; }
  .topbar { margin-bottom: 14px; }
  .topbar h2 { font-size: 24px; }
  .top-actions { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
  .top-actions button:last-child { grid-column: 1 / -1; }
  .card { padding: 15px; border-radius: 16px; }
  .toolbar, .import-grid, .form-grid, .stats-grid, .stats-two-col { grid-template-columns: 1fr; }
  .bank-manager-grid { grid-template-columns: 1fr; }
  .toolbar button, .sample-actions button, .answer-actions button { width: 100%; min-height: 44px; }
  .question-card h3, .exam-running h3 { font-size: 18px; }
  .question-layout { display: flex; flex-direction: column; }
.progress-card { order: 2; }
  .option { min-height: 52px; padding: 14px 12px; }
  .exam-header {
    position: sticky;
    top: 0;
    z-index: 8;
    margin: -15px -15px 14px;
    padding: 12px 15px;
    background: rgba(255,255,255,.96);
    border-bottom: 1px solid var(--border);
  }
  .list-row, .section-head { flex-direction: column; align-items: stretch; }
  .list-row-actions { justify-content: flex-start; }
  .modal-card .answer-actions { display: grid; grid-template-columns: 1fr; }
  pre { max-width: 100%; }
}


.import-options {
  display: grid;
  grid-template-columns: 110px repeat(2, minmax(220px, 1fr));
  gap: 12px;
  align-items: stretch;
  margin: 14px 0 18px;
}
.option-title {
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
}
.radio-card {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  cursor: pointer;
}
.radio-card input { margin-top: 3px; }
.radio-card span { display: grid; gap: 4px; }
.radio-card em { font-style: normal; color: var(--muted); font-size: 12px; }
.small-note { margin-top: 8px; font-size: 12px; }
@media (max-width: 920px) {
  .import-options { grid-template-columns: 1fr; }
}

.progress-card {
  align-self: start;
  position: sticky;
  top: 20px;
}
.answer-card-summary-btn { width: 100%; margin-top: 16px; }
.answer-card-trigger { display: none; }
.answer-card-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(15, 23, 42, .52);
  backdrop-filter: blur(5px);
}
.answer-card-sheet {
  width: min(720px, 100%);
  max-height: min(820px, calc(100vh - 44px));
  overflow: auto;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: #fff;
  box-shadow: var(--shadow);
}
.answer-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.answer-card-head h3 { margin: 0; font-size: 24px; }
.answer-card-head p { margin: 6px 0 0; }
.answer-card-close { min-height: 38px; padding: 8px 13px; }
.answer-card-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 20px 0 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.answer-card-legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend-dot {
  width: 14px;
  height: 14px;
  display: inline-block;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: #fff;
}
.legend-dot.correct { background: var(--success); border-color: var(--success); }
.legend-dot.incorrect { background: var(--danger); border-color: var(--danger); }
.legend-dot.current { background: var(--primary); border-color: var(--primary); }
.question-range-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 8px;
}
.range-tab {
  min-height: 36px;
  flex: 0 0 auto;
  padding: 7px 12px;
  color: var(--muted);
  background: var(--panel-soft);
  border: 1px solid var(--border);
  box-shadow: none;
}
.range-tab:hover { box-shadow: none; }
.range-tab.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.answer-card-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(42px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.answer-card-grid .grid-btn {
  width: 100%;
  aspect-ratio: 1;
  height: auto;
  min-height: 44px;
  border-radius: 50%;
  font-size: 14px;
}
.answer-card-grid .grid-btn.current {
  outline: 3px solid #bfdbfe;
  outline-offset: 2px;
}
.answer-card-open { overflow: hidden; }

@media (max-width: 767px) {
  body { padding-bottom: 0; background: #f3f5f8; }
  .main { padding: 10px; }
  #tab-practice {
    padding-bottom: calc(104px + env(safe-area-inset-bottom));
  }
  .topbar { padding: 4px 4px 0; }
  .topbar p { font-size: 13px; }
  #tab-practice .toolbar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    margin: 0 -10px 10px;
    padding: 10px;
    border-width: 1px 0;
    border-radius: 0;
    box-shadow: none;
  }
  #tab-practice .toolbar label { min-width: 130px; flex: 0 0 auto; }
  #tab-practice .toolbar .search-wrap { min-width: 210px; }
  #tab-practice .toolbar button { width: auto; min-width: 100px; flex: 0 0 auto; }
  .question-card {
    padding: 18px 14px 24px;
    border-radius: 18px;
    box-shadow: none;
  }
  .question-meta { margin-bottom: 16px; }
  .question-card h3 {
    margin: 4px 0 22px;
    font-size: 20px;
    line-height: 1.72;
    font-weight: 700;
  }
  .options { gap: 12px; }
  .option {
    min-height: 58px;
    padding: 13px 12px;
    border-radius: 16px;
    align-items: center;
    font-size: 16px;
  }
  .answer-panel {
    margin-top: 20px;
    padding: 16px;
    border-radius: 16px;
    line-height: 1.85;
  }
  .progress-card { display: none; }
  .question-card > .answer-actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 17;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 5px;
    margin: 0;
    padding: 8px 7px calc(8px + env(safe-area-inset-bottom));
    background: rgba(255,255,255,.97);
    border-top: 1px solid var(--border);
    box-shadow: 0 -8px 22px rgba(15, 23, 42, .08);
    backdrop-filter: blur(12px);
  }
  .question-card > .answer-actions button {
    width: 100%;
    min-height: 44px;
    padding: 7px 3px;
    border-radius: 11px;
    font-size: 11px;
  }
  .question-card > .answer-actions #submitAnswerBtn { font-size: 12px; }
  .answer-card-trigger { display: block; }
  .answer-card-open .question-card > .answer-actions { display: none; }
  .answer-card-backdrop { align-items: end; padding: 0; }
  .answer-card-sheet {
    width: 100%;
    max-height: 88vh;
    padding: 18px 14px calc(32px + env(safe-area-inset-bottom));
    border-width: 1px 0 0;
    border-radius: 24px 24px 0 0;
  }
  .answer-card-sheet::before {
    content: "";
    display: block;
    width: 42px;
    height: 4px;
    margin: -8px auto 14px;
    border-radius: 999px;
    background: var(--border-strong);
  }
  .answer-card-head h3 { font-size: 21px; }
  .answer-card-legend { justify-content: space-between; gap: 10px; margin-top: 16px; }
  .answer-card-grid { grid-template-columns: repeat(5, minmax(44px, 1fr)); gap: 14px 12px; }
  .answer-card-grid .grid-btn { min-height: 48px; font-size: 15px; }
}

/* 2026-06 mobile polish: avoid bottom overlap, move global actions out of practice home, compact filters */
.bank-maintenance-card .maintenance-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

@media (max-width: 767px) {
  :root {
    --mobile-answer-bar-height: 70px;
    --mobile-extra-bottom: 104px;
  }

  html, body {
    min-height: 100%;
    overflow-x: hidden;
  }

  .sidebar {
    position: sticky;
    top: 0;
    z-index: 30;
  }

  .main {
    padding: 10px 10px calc(var(--mobile-extra-bottom) + env(safe-area-inset-bottom));
  }

  #tab-practice {
    padding-bottom: calc(var(--mobile-extra-bottom) + env(safe-area-inset-bottom));
  }

  .topbar {
    gap: 6px;
    margin-bottom: 8px;
    padding: 2px 4px 0;
  }

  .topbar h2 {
    font-size: 22px;
    line-height: 1.2;
  }

  .topbar p {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.45;
  }

  .top-actions {
    display: none !important;
  }

  #tab-practice .toolbar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    overflow: visible;
    margin: 0 0 10px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: none;
    background: rgba(255,255,255,.94);
  }

  #tab-practice .toolbar label,
  #tab-practice .toolbar .search-wrap {
    min-width: 0;
    width: 100%;
    flex: initial;
    gap: 5px;
    font-size: 12px;
    line-height: 1.2;
  }

  #tab-practice .toolbar select,
  #tab-practice .toolbar input {
    min-height: 38px;
    height: 38px;
    padding: 7px 10px;
    border-radius: 11px;
    font-size: 13px;
  }

  #tab-practice .toolbar .search-wrap {
    grid-column: 1 / -1;
  }

  #tab-practice .toolbar button {
    grid-column: 1 / -1;
    width: 100%;
    min-height: 40px;
    height: 40px;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 13px;
  }

  .question-card {
    padding: 18px 14px 22px;
    margin-bottom: 10px;
  }

  .question-card h3 {
    font-size: 19px;
    line-height: 1.72;
  }

  .options {
    padding-bottom: 8px;
  }

  .option {
    min-height: 56px;
    font-size: 15px;
    line-height: 1.55;
  }

  .answer-panel {
    margin-bottom: 6px;
    padding-bottom: 14px;
  }

  .question-card > .answer-actions {
    left: 0;
    right: 0;
    bottom: 0;
    min-height: calc(var(--mobile-answer-bar-height) + env(safe-area-inset-bottom));
    padding: 7px 8px calc(8px + env(safe-area-inset-bottom));
    align-items: center;
  }

  .question-card > .answer-actions button {
    min-height: 40px;
    font-size: 12px;
  }

  .exam-running {
    padding-bottom: calc(var(--mobile-extra-bottom) + env(safe-area-inset-bottom));
  }

  .exam-running > .answer-actions {
    position: sticky;
    bottom: 0;
    z-index: 12;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin: 18px -10px -10px;
    padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
    background: rgba(255,255,255,.96);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(12px);
  }

  .bank-maintenance-card .maintenance-actions,
  .sample-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .bank-maintenance-card .maintenance-actions button,
  .sample-actions button {
    width: 100%;
  }
}

/* 2026-06 mobile import-mode fix: compact radio cards on narrow screens */
@media (max-width: 767px) {
  #tab-bank .import-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    margin: 10px 0 14px;
    width: 100%;
    max-width: 100%;
    overflow: visible;
  }

  #tab-bank .option-title {
    font-size: 14px;
    line-height: 1.35;
    margin-bottom: 2px;
  }

  #tab-bank .radio-card {
    width: 100%;
    min-height: auto;
    box-sizing: border-box;
    display: grid;
    grid-template-columns: 22px minmax(0, 1fr);
    align-items: start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    overflow: hidden;
  }

  #tab-bank .radio-card input {
    width: 18px;
    height: 18px;
    margin: 2px 0 0;
    flex: none;
  }

  #tab-bank .radio-card span {
    min-width: 0;
    display: block;
  }

  #tab-bank .radio-card strong {
    display: block;
    font-size: 14px;
    line-height: 1.35;
    white-space: normal;
  }

  #tab-bank .radio-card em {
    display: block;
    margin-top: 3px;
    font-size: 12px;
    line-height: 1.45;
    white-space: normal;
    word-break: normal;
    overflow-wrap: anywhere;
  }
}

.sync-status {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.sync-status.syncing {
  color: #2563eb;
}
.sync-status.failed {
  color: #b91c1c;
}


.question-import-workspace {
  display: grid;
  gap: 18px;
}
.import-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, .10), rgba(22, 163, 74, .08)),
    rgba(255, 255, 255, .96);
  border-color: #bfdbfe;
}
.import-hero h3 {
  margin: 10px 0 6px;
  font-size: 26px;
}
.import-flow {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  justify-content: flex-end;
  color: #1e40af;
  font-size: 13px;
  font-weight: 900;
}
.import-flow span {
  padding: 8px 10px;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}
.import-flow i {
  width: 22px;
  height: 2px;
  background: #93c5fd;
  display: inline-block;
}
.import-setup-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .85fr);
  gap: 18px;
  align-items: start;
}
.import-upload-card,
.import-action-card {
  margin-bottom: 0;
}
.import-start-grid {
  grid-template-columns: minmax(240px, 1fr) minmax(260px, 1.2fr);
}
.import-ai-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: auto;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}
.import-ai-toggle input,
.inline-check input {
  width: auto;
  min-height: auto;
}
.import-summary {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0;
}
.import-stat {
  min-height: 72px;
  display: grid;
  justify-items: start;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 15px;
  color: var(--text);
  background: #fff;
  box-shadow: none;
}
.import-stat:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
  background: #fff;
}
.import-stat span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}
.import-stat strong {
  font-size: 24px;
  line-height: 1;
}
.import-stat.ready strong { color: var(--success); }
.import-stat.pending_review strong { color: var(--warning); }
.import-stat.failed strong { color: var(--danger); }
.import-stat.imported strong { color: var(--primary); }
.import-action-buttons {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.batch-repair-progress {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--warning-bg, #fff8e1);
  border: 1px solid var(--warning, #f0a000);
  border-radius: 6px;
  font-size: 0.9em;
  color: var(--warning, #b06000);
}
.batch-repair-progress.hidden { display: none; }
.import-preview-item.item-repairing {
  opacity: 0.85;
  border-left: 3px solid var(--primary, #2563eb);
}
.import-preview-item.item-repairing .import-status {
  animation: repairPulse 1.2s ease-in-out infinite;
}
@keyframes repairPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.import-preview-list {
  display: grid;
  gap: 14px;
}
.import-preview-item {
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(255,255,255,.96);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.import-preview-item.pending_review { border-color: #fde68a; }
.import-preview-item.failed { border-color: #fecdd3; }
.import-preview-item.imported { border-color: #bbf7d0; }
.import-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
}
.import-title-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.import-status,
.import-type-pill,
.import-confidence {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
  background: #e2e8f0;
  color: #334155;
}
.import-status.ready,
.import-status.imported {
  color: #166534;
  background: #dcfce7;
}
.import-status.pending_review {
  color: #92400e;
  background: #fef3c7;
}
.import-status.failed {
  color: #b91c1c;
  background: #ffe4e6;
}
.import-type-pill {
  color: #1e40af;
  background: #dbeafe;
}
.import-confidence {
  color: #475569;
  background: #f1f5f9;
}
.pending-select {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: auto;
  color: #92400e;
  font-size: 13px;
  font-weight: 900;
}
.import-alerts {
  display: grid;
  gap: 8px;
  padding: 12px 16px 0;
}
.import-message,
.correction-box {
  padding: 10px 12px;
  border-radius: 13px;
  font-size: 13px;
  line-height: 1.6;
}
.import-message.ok {
  color: #166534;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
}
.import-message.warn {
  color: #b91c1c;
  background: #fff1f2;
  border: 1px solid #fecdd3;
}
.correction-box.applied {
  color: #14532d;
  background: #ecfdf5;
  border: 1px solid #bbf7d0;
}
.correction-box.suspected {
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fde68a;
}
.correction-box ul {
  margin: 6px 0 0 18px;
  padding: 0;
}
.correction-box li + li { margin-top: 4px; }
.correction-box span { color: var(--muted); }
.import-card-body {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(340px, .85fr);
  gap: 16px;
  padding: 16px;
}
.import-main-fields,
.import-side-fields {
  display: grid;
  gap: 12px;
  align-content: start;
}
.import-main-fields label,
.import-side-fields label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}
.import-mini-grid {
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 0;
}
.import-preview-item textarea {
  min-height: 92px;
  line-height: 1.6;
}
.import-preview-item .compact-textarea {
  min-height: 110px;
}
.import-preview-item .option-textarea {
  min-height: 226px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}
.raw-text-details {
  margin: 0 16px 14px;
  padding: 10px 12px;
  border-radius: 13px;
  background: #f8fafc;
  border: 1px solid var(--border);
}
.raw-text-details summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 900;
}
.import-card-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 0 16px 16px;
}
.empty-preview {
  padding: 22px;
  text-align: center;
}

@media (max-width: 1100px) {
  .import-setup-grid,
  .import-card-body {
    grid-template-columns: 1fr;
  }
  .import-summary {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (max-width: 767px) {
  .import-hero,
  .import-card-head {
    align-items: flex-start;
    flex-direction: column;
  }
  .import-flow {
    justify-content: flex-start;
  }
  .import-flow i { display: none; }
  .import-start-grid,
  .import-mini-grid,
  .import-summary {
    grid-template-columns: 1fr;
  }
  .import-card-body,
  .import-alerts,
  .import-card-actions {
    padding-left: 12px;
    padding-right: 12px;
  }
  .raw-text-details {
    margin-left: 12px;
    margin-right: 12px;
  }
}



/* 2026-06 mobile answer bar distance polish: keep safe scroll room without large blank area */
@media (max-width: 767px) {
  :root {
    --mobile-answer-bar-height: 70px;
    --mobile-extra-bottom: 104px;
  }

  .main,
  #tab-practice {
    padding-bottom: calc(var(--mobile-extra-bottom) + env(safe-area-inset-bottom));
  }

  .question-card {
    padding-bottom: 22px;
    margin-bottom: 10px;
  }

  .answer-panel {
    margin-bottom: 6px;
    padding-bottom: 14px;
  }

  .question-card > .answer-actions {
    min-height: calc(var(--mobile-answer-bar-height) + env(safe-area-inset-bottom));
    padding-top: 7px;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
  }

  .question-card > .answer-actions button {
    min-height: 40px;
  }
}

/* 2026-06 mobile answer bar overlap fix: keep actions in document flow on phones */
@media (max-width: 767px) {
  :root {
    --mobile-answer-bar-height: 62px;
    --mobile-extra-bottom: 28px;
  }

  .main,
  #tab-practice {
    padding-bottom: calc(var(--mobile-extra-bottom) + env(safe-area-inset-bottom));
  }

  .question-card {
    padding-bottom: 12px;
    margin-bottom: 14px;
  }

  .options {
    padding-bottom: 0;
  }

  .answer-panel {
    margin-bottom: 10px;
    padding-bottom: 14px;
  }

  .question-card > .answer-actions {
    position: sticky !important;
    left: auto;
    right: auto;
    bottom: env(safe-area-inset-bottom);
    min-height: auto;
    margin: 14px -6px -4px;
    padding: 8px 6px calc(8px + env(safe-area-inset-bottom));
    border-radius: 16px;
    box-shadow: 0 -4px 18px rgba(15, 23, 42, .08);
  }

  .question-card > .answer-actions button {
    min-height: 40px;
  }
}

/* Question import cleanup controls */
.import-file-actions {
  align-items: center;
  flex-wrap: wrap;
}
.import-clear-btn {
  border-color: #fecdd3;
  color: #be123c;
  background: #fff1f2;
}
.import-clear-btn:hover {
  border-color: #fb7185;
  color: #9f1239;
  background: #ffe4e6;
}

/* Question editor and practice count improvements */
.practice-count-hint {
  display: block;
  margin-top: -2px;
  font-size: 12px;
  font-weight: 700;
  color: #94a3b8;
  line-height: 1.35;
}
#practiceCount::placeholder {
  color: #94a3b8;
}
.question-edit-card {
  width: min(820px, 100%);
  max-height: min(90vh, 820px);
  overflow: auto;
}
.question-edit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.question-edit-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}
.question-edit-grid .full {
  grid-column: 1 / -1;
}
.question-edit-grid textarea {
  resize: vertical;
  min-height: 92px;
}
#editQuestionBtn, #deleteQuestionBtn {
  white-space: nowrap;
}
@media (max-width: 767px) {
  .question-edit-card {
    width: 100%;
    max-height: 92vh;
    border-radius: 18px;
    padding: 18px;
  }
  .question-edit-grid {
    grid-template-columns: 1fr;
  }
  .question-card > .answer-actions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    min-height: calc(116px + env(safe-area-inset-bottom));
  }
  .question-card > .answer-actions button {
    min-height: 38px;
  }
}

/* Practice toolbar layout correction */
#tab-practice .practice-toolbar {
  display: grid;
  grid-template-columns: minmax(150px, .9fr) minmax(190px, 1.1fr) minmax(130px, .75fr) minmax(130px, .65fr) minmax(240px, 1.45fr) auto;
  gap: 12px;
  align-items: end;
  padding: 18px 20px 16px;
}
#tab-practice .practice-toolbar label {
  min-width: 0;
  gap: 6px;
}
#tab-practice .practice-toolbar select,
#tab-practice .practice-toolbar input {
  width: 100%;
  min-height: 44px;
  height: 44px;
}
#tab-practice .practice-toolbar .practice-count-field input {
  text-align: left;
}
#tab-practice .practice-toolbar #buildPracticeBtn {
  min-width: 128px;
  height: 44px;
  margin: 0;
  white-space: nowrap;
}
#tab-practice .practice-toolbar .practice-count-hint {
  grid-column: 1 / -1;
  display: block;
  min-height: 0;
  margin: -2px 0 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
}
#tab-practice .practice-toolbar .practice-count-hint::before {
  content: "数量说明：";
  color: #334155;
}

@media (max-width: 1280px) {
  #tab-practice .practice-toolbar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  #tab-practice .practice-toolbar .practice-search-field {
    grid-column: 1 / span 3;
  }
  #tab-practice .practice-toolbar #buildPracticeBtn {
    width: 100%;
  }
}

@media (max-width: 767px) {
  #tab-practice .practice-toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin: 0 0 10px;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: none;
    background: rgba(255,255,255,.94);
  }
  #tab-practice .practice-toolbar .practice-search-field,
  #tab-practice .practice-toolbar #buildPracticeBtn,
  #tab-practice .practice-toolbar .practice-count-hint {
    grid-column: 1 / -1;
  }
  #tab-practice .practice-toolbar .practice-count-hint {
    font-size: 11px;
  }
}