:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #697386;
  --line: #dde5f0;
  --primary: #2563eb;
  --primary-soft: #e8f0ff;
  --good: #16a34a;
  --bad: #dc2626;
  --warn: #f59e0b;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}
button, input {
  font: inherit;
}
button, input, select, textarea {
  font: inherit;
}

.app-shell {
  min-height: 100svh;
  display: grid;
  grid-template-columns: 240px 1fr;
}
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px;
  border-right: 1px solid var(--line);
  background: var(--panel);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-weight: 800;
}
.brand span, .muted {
  display: block;
  color: var(--muted);
  font-size: 14px;
}
.nav {
  display: grid;
  gap: 8px;
}
.nav-button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 0 14px;
}
.nav-button.is-active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
}
.content {
  padding: 28px;
  padding-bottom: 92px;
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
}
.view { display: none; }
.view.is-active { display: block; }
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: 32px; }
h2 { font-size: 20px; }

.quiz-card, .form-card, .result-panel, .detail, .metric, .ranking, .data-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.quiz-card {
  min-height: 340px;
  display: grid;
  place-items: center;
  padding: 32px;
  text-align: center;
}
.quiz-progress {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.source {
  color: var(--muted);
  font-size: 18px;
}
.bank-name {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  padding: 0 12px;
  margin-bottom: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
}
.question-number {
  margin: 10px 0 26px;
  font-size: clamp(42px, 8vw, 86px);
  font-weight: 800;
  line-height: 1.05;
}
.answer-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.primary-button, .secondary-button, .danger-button, .tag-editor button {
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0 18px;
  font-weight: 700;
}
.primary-button {
  background: var(--primary);
  color: white;
}
.secondary-button {
  background: var(--panel);
  border-color: var(--line);
  color: var(--text);
}
.danger-button {
  background: #fee2e2;
  color: var(--bad);
}
.full { width: 100%; margin-top: 18px; }
.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
}
.result-actions .primary-button,
.result-actions .secondary-button {
  width: 100%;
}
.result-panel {
  margin-top: 16px;
  padding: 18px;
}
.result-summary {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.pill, .tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  padding: 0 10px;
  font-size: 13px;
  background: #eef2f7;
  color: #39465a;
}
.pill.good { background: #dcfce7; color: var(--good); }
.pill.bad { background: #fee2e2; color: var(--bad); }
.pill.warn { background: #fef3c7; color: #92400e; }
.field-label {
  display: block;
  margin: 16px 0 7px;
  font-weight: 700;
}
input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 0 12px;
}
.header-actions {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}
.library-tools {
  flex: 1;
  min-width: 320px;
}
.compact-field {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  min-width: 180px;
}
.compact-field select {
  min-height: 44px;
}
.search-input {
  max-width: 460px;
}
.tag-editor {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}
.detail-tag-editor {
  margin-bottom: 10px;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.tag button {
  margin-left: 6px;
  border: 0;
  background: transparent;
  color: inherit;
}
.hidden { display: none; }
.app-error {
  position: fixed;
  z-index: 20;
  left: 16px;
  right: 16px;
  top: 16px;
  padding: 12px 14px;
  border: 1px solid #fecaca;
  border-radius: 8px;
  background: #fef2f2;
  color: #991b1b;
  font-size: 14px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, .12);
}

.library-layout {
  display: grid;
  grid-template-columns: minmax(300px, 440px) 1fr;
  gap: 16px;
}
.list {
  display: grid;
  gap: 10px;
  align-content: start;
}
.question-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
  text-align: left;
}
.question-row.is-selected {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-soft);
}
.row-title {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-weight: 800;
}
.row-title > span:first-child {
  min-width: 0;
  overflow-wrap: anywhere;
}
.row-stats {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
  flex-shrink: 0;
  max-width: 220px;
}
.detail, .form-card, .ranking, .data-card {
  padding: 18px;
}
.detail-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}
.detail-save {
  margin-top: 12px;
}
.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.detail-header h2 {
  margin-bottom: 6px;
}
.detail-close {
  display: none;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  padding: 0 12px;
  font-weight: 700;
}
.import-card {
  margin-top: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.metric {
  padding: 18px;
}
.metric span {
  display: block;
  font-size: 30px;
  font-weight: 800;
}
.metric small { color: var(--muted); }
.rank-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.rank-row:last-child { border-bottom: 0; }
.rank-button {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.rank-button:hover {
  color: var(--primary);
}
.rank-button.is-selected {
  color: var(--primary);
  font-weight: 700;
}
.point-question-panel {
  margin-top: 16px;
}
.point-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.point-panel-header h2 {
  margin-bottom: 4px;
}
.point-question-list {
  display: grid;
  gap: 10px;
}
.point-question-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}
.point-question-side {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}
.backup-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.data-card {
  margin-top: 16px;
}
.install-steps {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.8;
}
.file-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.file-label input { display: none; }

.bottom-nav {
  display: none;
  position: fixed;
  inset: auto 0 0 0;
  padding: 8px max(8px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
  background: rgba(255,255,255,.94);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(14px);
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.bottom-nav .nav-button {
  text-align: center;
  padding: 0;
}


@media (min-width: 761px) {
  .library-layout {
    align-items: start;
  }
  #question-list {
    max-height: calc(100svh - 150px);
    overflow-y: auto;
    padding-right: 4px;
    overscroll-behavior: contain;
  }
  #question-detail {
    position: sticky;
    top: 28px;
    max-height: calc(100svh - 56px);
    overflow-y: auto;
  }
}

@media (max-width: 760px) {
  .app-shell { display: block; }
  .sidebar { display: none; }
  .bottom-nav { display: grid; }
  .content { padding: 18px; padding-bottom: 92px; }
  .page-header { align-items: flex-start; flex-direction: column; }
  .header-actions, .library-tools { width: 100%; }
  .compact-field, .search-input { width: 100%; max-width: none; }
  h1 { font-size: 28px; }
  .library-layout { grid-template-columns: 1fr; }
  .result-actions { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .point-panel-header { display: block; }
  .point-panel-header .secondary-button { margin-top: 10px; width: 100%; }
  .point-question-row { grid-template-columns: 1fr; }
  .point-question-side { justify-content: flex-start; }
  #question-detail {
    position: fixed;
    z-index: 30;
    left: 0;
    right: 0;
    bottom: 0;
    max-height: min(82svh, 680px);
    overflow-y: auto;
    border-radius: 14px 14px 0 0;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
    box-shadow: 0 -16px 40px rgba(15, 23, 42, .18);
    transform: translateY(105%);
    transition: transform .18s ease;
  }
  body.mobile-detail-open #question-detail {
    transform: translateY(0);
  }
  body.mobile-detail-open::before {
    content: "";
    position: fixed;
    z-index: 25;
    inset: 0;
    background: rgba(15, 23, 42, .28);
  }
  .detail-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  .detail-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) and (orientation: landscape) {
  .quiz-card { min-height: 460px; }
}

textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  padding: 10px 12px;
  font: inherit;
}
textarea {
  resize: vertical;
  line-height: 1.5;
}
.import-mapping {
  margin-top: 14px;
}
.mapping-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.mapping-grid label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}
.table-preview {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 12px;
}
.table-preview table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}
.table-preview th, .table-preview td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}
.table-preview th {
  background: #f8fafc;
}
@media (max-width: 760px) {
  .mapping-grid { grid-template-columns: 1fr; }
}