:root {
  --bg: #f4f6f8;
  --bg-soft: #fbfcfd;
  --panel: #ffffff;
  --panel-muted: #f7f9fb;
  --panel-accent: #eef6f5;
  --border: #dfe5eb;
  --border-strong: #cbd5df;
  --text: #17202a;
  --muted: #647080;
  --muted-soft: #8b96a5;
  --primary: #1f6f78;
  --primary-strong: #155e67;
  --primary-soft: #e6f3f4;
  --accent: #6f5b1f;
  --accent-soft: #faf4df;
  --danger: #b5472f;
  --danger-soft: #fff0ea;
  --shadow: 0 8px 22px rgba(20, 32, 44, 0.055);
  --shadow-soft: 0 1px 2px rgba(20, 32, 44, 0.05);
  --radius-xl: 12px;
  --radius-lg: 10px;
  --radius-md: 8px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "SF Pro SC", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, #f9fbfc 0%, #f4f6f8 260px, #f4f6f8 100%);
}

code {
  font-family: "SFMono-Regular", "Consolas", monospace;
}

.page-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 22px 56px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 16px;
  align-items: stretch;
  margin-bottom: 18px;
}

.hero-main {
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: var(--shadow);
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 10px 0 10px;
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: 0;
}

.hero-text {
  margin: 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-muted);
  color: #42505f;
  font-size: 13px;
  font-weight: 600;
}

.hero-panel {
  display: grid;
  gap: 14px;
}

.hero-panel-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.hero-stat,
.summary-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-stat {
  padding: 14px;
}

.hero-stat span,
.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.hero-stat strong,
.summary-item strong {
  display: block;
  margin-top: 9px;
  font-size: 22px;
  line-height: 1.1;
  letter-spacing: 0;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.config-card,
.wrongbook-card,
.record-card,
.summary {
  padding: 20px;
}

.config-card-wide,
.submit-card,
.wrongbook-card-compact,
.record-card {
  margin-bottom: 18px;
}

.question-list,
.submit-card,
.summary,
.wrongbook-card-compact,
.record-card {
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.config-card-wide {
  background: #fff;
}

.config-form-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.9fr) minmax(0, 1.25fr);
  gap: 18px;
  align-items: start;
}

.section-head,
.summary-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 18px;
}

.section-head h2,
.summary-head h2 {
  margin: 8px 0 0;
  font-size: 23px;
  line-height: 1.18;
  letter-spacing: 0;
}

.section-actions,
.toolbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.control-group {
  margin-bottom: 0;
}

.control-group label,
.control-group span {
  display: block;
  margin-bottom: 9px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.field {
  width: 100%;
  min-height: 42px;
  padding: 0 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  outline: none;
  box-shadow: var(--shadow-soft);
}

.field[type="search"] {
  appearance: none;
}

.field:focus {
  border-color: #94c8cc;
  box-shadow: 0 0 0 4px rgba(31, 111, 120, 0.11);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.segmented-btn {
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--panel);
  text-align: left;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
}

.segmented-btn:hover {
  border-color: #b9cbd0;
  background: #f7fbfb;
}

.segmented-btn.active {
  border-color: #93c7cd;
  background: var(--primary-soft);
  color: var(--primary-strong);
  box-shadow: inset 0 0 0 1px rgba(31, 111, 120, 0.06);
}

.inline-note,
.wrongbook-summary,
.record-summary {
  margin-top: 16px;
  padding: 12px 14px;
  border: 1px solid #edf1f5;
  border-radius: var(--radius-md);
  background: var(--panel-muted);
  color: var(--muted);
  line-height: 1.75;
  font-size: 14px;
}

.btn {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary-strong);
  color: #fff;
  box-shadow: 0 6px 12px rgba(21, 94, 103, 0.14);
}

.btn-secondary {
  background: #f3f4f6;
  color: var(--text);
  border-color: #edf0f3;
}

.btn-outline {
  background: #fff;
  color: var(--primary);
  border-color: #c8dcdf;
}

.btn-accent {
  background: #6f5b1f;
  color: #fff;
  box-shadow: 0 6px 12px rgba(111, 91, 31, 0.12);
}

.btn-danger {
  background: #fff7f4;
  color: var(--danger);
  border-color: #f4ddd3;
}

.status-banner {
  margin: 0 auto 18px;
  max-width: 960px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
}

.status-banner.info {
  background: #eef7f7;
  border: 1px solid #cce5e8;
  color: #155e67;
}

.status-banner.error {
  background: #fff6f2;
  border: 1px solid #f2ddd4;
  color: var(--danger);
}

.summary {
  margin-bottom: 20px;
  background: #fff;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.summary-item {
  padding: 14px;
  border-radius: var(--radius-lg);
  background: var(--panel-muted);
}

.summary-extended {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 14px;
  margin-top: 16px;
}

.wrong-ids,
.distribution-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel-muted);
}

.distribution-card {
  background: var(--accent-soft);
}

.wrong-ids span,
.distribution-card span {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.wrong-ids p,
.distribution-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  word-break: break-word;
}

.distribution-tip {
  margin-top: 8px !important;
}

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

.question-card {
  padding: 20px;
  border-radius: var(--radius-xl);
  transition: border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.question-card.question-correct {
  border-color: #9fd5c8;
  background: #f4fbf8;
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.08);
}

.question-card.question-incorrect {
  border-color: #efb8aa;
  background: #fff5f2;
  box-shadow: 0 8px 24px rgba(194, 65, 12, 0.08);
}

.question-card.question-unanswered {
  border-color: #d8b05d;
  background: #fffaf0;
  box-shadow: 0 0 0 3px rgba(216, 176, 93, 0.16);
}

.question-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.question-index {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
  flex: 0 0 auto;
  color: var(--muted-soft);
  font-size: 13px;
  line-height: 1.6;
  white-space: nowrap;
}

.favorite-toggle {
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid #d8e0e8;
  border-radius: var(--radius-sm);
  background: #fff;
  color: #596676;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.favorite-toggle:hover {
  border-color: #c8b46d;
  background: #fffaf0;
}

.favorite-toggle-active {
  border-color: #d7bc57;
  background: #fff5cf;
  color: #755d12;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

.badge-type-single {
  background: var(--primary-soft);
  color: var(--primary);
}

.badge-type-multiple {
  background: #fff6e8;
  color: #9a6700;
}

.badge-module,
.badge-difficulty,
.badge-keypoint {
  background: #f4f6f8;
  color: var(--muted);
}

.question-title {
  margin: 13px 0 8px;
  font-size: 20px;
  line-height: 1.68;
  letter-spacing: 0;
}

.question-hint {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.option-list {
  display: grid;
  gap: 8px;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 11px 13px;
  border: 1px solid #dce4ec;
  border-radius: var(--radius-md);
  background: #fff;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 1px 1px rgba(20, 32, 44, 0.035);
  transition: border-color 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
}

.option-item:hover {
  border-color: #b9cbd0;
  background: #fbfcfe;
}

.option-item.selected {
  border-color: #93c7cd;
  background: var(--primary-soft);
  box-shadow: inset 0 0 0 1px rgba(31, 111, 120, 0.06);
}

.option-item.correct {
  border-color: #bfe6dc;
  background: var(--accent-soft);
}

.option-item.incorrect {
  border-color: #f2d2c6;
  background: var(--danger-soft);
}

.option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: #eff3f7;
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
}

.option-item.selected .option-label {
  background: var(--primary-strong);
  color: #fff;
}

.option-item.correct .option-label {
  background: var(--accent);
  color: #fff;
}

.option-item.incorrect .option-label {
  background: var(--danger);
  color: #fff;
}

.option-text {
  flex: 1;
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
}

.answer-panel {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid #dde7f4;
  border-radius: var(--radius-lg);
  background: #fafcff;
}

.answer-panel.correct-state {
  border-color: #c8e7df;
  background: #f6fcfb;
}

.answer-panel.wrong-state {
  border-color: #f1d5ca;
  background: #fffaf7;
}

.answer-panel p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.answer-panel strong {
  color: var(--text);
}

.submit-card {
  background: #fff;
}

.submit-card-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 2px;
}

.submit-note {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.answer-progress {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  margin: 10px 0 0;
  padding: 0 10px;
  border: 1px solid #dce7ea;
  border-radius: var(--radius-sm);
  background: #f4faf9;
  color: var(--primary-strong);
  font-size: 13px;
  font-weight: 700;
}

.answer-progress-complete {
  border-color: #cbdcbf;
  background: #f3f8ee;
  color: #4d6b22;
}

.submit-btn-large {
  flex: 0 0 auto;
  min-width: 156px;
  min-height: 44px;
  padding: 0 20px;
  font-size: 14px;
}

.table-shell {
  overflow-x: auto;
  border: 1px solid #edf1f5;
  border-radius: var(--radius-lg);
  background: #fff;
}

.table-shell-compact {
  max-height: 260px;
  overflow: auto;
}

.wrongbook-table,
.record-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
}

.wrongbook-table th,
.wrongbook-table td,
.record-table th,
.record-table td {
  padding: 12px 13px;
  border-bottom: 1px solid #eef2f6;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.wrongbook-table thead th,
.record-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #fbfcfd;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.wrongbook-table tbody tr,
.record-table tbody tr {
  transition: background 0.14s ease;
}

.wrongbook-table tbody tr:hover,
.record-table tbody tr:hover {
  background: #fbfcff;
}

.wrongbook-table td:nth-child(1),
.record-table td:nth-child(1),
.record-table td:nth-child(2),
.record-table td:nth-child(3) {
  white-space: nowrap;
}

.wrongbook-table td:nth-child(3) {
  max-width: 360px;
  min-width: 280px;
  color: #374151;
  word-break: break-word;
}

.record-table td:nth-child(8) {
  max-width: 320px;
  color: #4b5563;
  word-break: break-word;
}

.chart-card {
  margin-bottom: 16px;
  padding: 16px 18px;
  background: var(--panel-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.chart-card canvas {
  display: block;
  border-radius: var(--radius-sm);
}

.empty-cell {
  padding: 24px 12px;
  color: var(--muted);
  text-align: center;
}

.record-card-collapsed {
  overflow: hidden;
}

.record-backup-btn {
  background: var(--panel);
  color: var(--primary);
  border-color: #c8dcdf;
}

.record-backup-btn:hover {
  background: var(--primary-soft);
}

.weekly-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.weekly-summary-item {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #fff;
  text-align: center;
}

.weekly-summary-item span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 6px;
}

.weekly-summary-item strong {
  display: block;
  font-size: 20px;
  color: var(--primary-strong);
}

.record-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  list-style: none;
  cursor: pointer;
}

.record-toggle::-webkit-details-marker {
  display: none;
}

.record-summary-inline {
  margin-top: 0;
  min-width: 280px;
  max-width: 480px;
}

.record-side {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.record-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.record-content {
  margin-top: 16px;
}

.empty-state {
  padding: 34px 24px;
  text-align: center;
}

.empty-state h2 {
  margin: 0 0 12px;
  font-size: 26px;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.hidden {
  display: none !important;
}

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-panel-grid,
  .config-form-grid,
  .summary-extended {
    grid-template-columns: 1fr;
  }

  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 12px 9px 36px;
  }

  .hero h1 {
    font-size: 27px;
  }

  .question-title {
    font-size: 19px;
  }

  .question-top,
  .summary-head,
  .section-head,
  .submit-card-inner,
  .record-toggle {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-panel-grid,
  .summary-grid,
  .segmented {
    grid-template-columns: 1fr;
  }

  .config-card,
  .wrongbook-card,
  .record-card,
  .summary,
  .question-card {
    padding: 14px;
  }

  .hero-main {
    padding: 16px 14px;
  }

  .hero-text {
    font-size: 14px;
  }

  .hero-stat {
    padding: 13px;
  }

  .hero-stat strong,
  .summary-item strong {
    font-size: 20px;
  }

  .section-head h2,
  .summary-head h2 {
    font-size: 22px;
  }

  .toolbar-actions,
  .section-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn,
  .field,
  .segmented-btn {
    width: 100%;
  }

  .question-index {
    justify-content: flex-start;
    white-space: normal;
  }

  .option-item {
    padding: 10px 12px;
  }

  .option-label {
    flex-basis: 30px;
    width: 30px;
    height: 30px;
  }

  .record-summary-inline {
    min-width: 0;
    max-width: none;
  }

  .record-side,
  .record-actions {
    justify-items: stretch;
    justify-content: stretch;
  }

  .record-actions {
    display: grid;
    grid-template-columns: 1fr;
  }
}