:root {
  --bg: #0f1115;
  --bg-elev: #161a21;
  --bg-elev-2: #1c2129;
  --border: #262c36;
  --border-strong: #353d4a;
  --text: #e6e9ef;
  --text-dim: #9aa3b2;
  --text-faint: #6b7383;
  --accent: #5b8def;
  --accent-soft: rgba(91, 141, 239, 0.14);
  --accent-hover: rgba(91, 141, 239, 0.22);
  --green: #4ade80;
  --radius: 10px;
  --radius-sm: 7px;
  --shadow: 0 8px 30px rgba(0,0,0,0.45);
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(15, 17, 21, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand-mark { font-size: 22px; color: var(--accent); }
.brand-mark-sm { font-size: 16px; }
.brand-sub { font-size: 13px; color: var(--text-faint); font-weight: 500; margin-left: 2px; }

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 560px;
}
.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-faint);
  pointer-events: none;
}
#search {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 38px 10px 40px;
  font-size: 14px;
  transition: border-color .15s, background .15s;
}
#search::placeholder { color: var(--text-faint); }
#search:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-elev-2);
}
.clear-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.clear-btn:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------- Layout ---------- */
.layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  align-items: start;
}

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  padding-right: 4px;
}
.sidebar-section { margin-bottom: 26px; }
.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  font-weight: 600;
  margin-bottom: 10px;
}
.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 12px;
  cursor: pointer;
  padding: 0;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
}
.link-btn:hover { text-decoration: underline; }

.cat-list { display: flex; flex-direction: column; gap: 2px; }
.cat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  background: none;
  border: none;
  color: var(--text-dim);
  text-align: left;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13.5px;
  transition: background .12s, color .12s;
}
.cat-item:hover { background: var(--bg-elev); color: var(--text); }
.cat-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 500; }
.cat-item .cat-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cat-item .cat-count {
  font-size: 11.5px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.cat-item.active .cat-count { color: var(--accent); }

.stats {
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
  padding: 12px;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.stats b { color: var(--text-dim); font-weight: 600; }

/* ---------- Content / toolbar ---------- */
.content { min-width: 0; }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 16px;
  flex-wrap: wrap;
}
.result-count { color: var(--text-dim); font-size: 13.5px; }
.result-count b { color: var(--text); }
.sort-wrap { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-dim); }
#sort {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}
#sort:focus { outline: none; border-color: var(--accent); }

/* ---------- Grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 14px;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 15px 16px 14px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 9px;
  transition: border-color .14s, transform .14s, background .14s;
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
  transform: translateY(-1px);
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.card-code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.01em;
}
.card-cat {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-faint);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 3px 7px;
  border-radius: 999px;
  white-space: nowrap;
  max-width: 60%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-preview {
  color: var(--text-dim);
  font-size: 13.5px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-faint);
  font-size: 14px;
}

/* ---------- Detail overlay ---------- */
.detail-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  overflow-y: auto;
}
.detail-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  cursor: pointer;
}
.detail {
  position: relative;
  max-width: 760px;
  margin: 40px auto 60px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 40px 44px 48px;
  animation: rise .22s ease;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.detail-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color .12s, border-color .12s;
}
.detail-close:hover { color: var(--text); border-color: var(--border-strong); }

.detail-body { font-size: 15.5px; line-height: 1.7; color: var(--text); }
.detail-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.detail-code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}
.detail-cat {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  background: var(--accent-soft);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 500;
}
.detail-body h1 {
  font-size: 20px;
  margin: 6px 0 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
}
.detail-body .vignette {
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text);
}
.detail-body .vignette p { margin: 0 0 14px; }
.detail-actions {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.detail-actions a {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--border-strong);
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  transition: background .12s;
}
.detail-actions a:hover { background: var(--accent-soft); }

/* ---------- Candidate questions ---------- */
.questions-section {
  margin-top: 14px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.questions-heading {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.questions-intro {
  font-size: 12.5px;
  color: var(--text-faint);
  margin: 0 0 18px;
  line-height: 1.5;
}
.questions-list { display: flex; flex-direction: column; gap: 12px; }
.question-card {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.question-card[data-source="explicit"] { border-left-color: var(--green); }
.question-card[data-source="fallback"] { border-left-color: var(--text-faint); }
.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}
.question-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.01em;
}
.question-card[data-source="explicit"] .question-label { color: var(--green); }
.question-card[data-source="fallback"] .question-label { color: var(--text-dim); }
.source-tag {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
}
.source-tag[data-source="explicit"] { color: var(--green); border-color: rgba(74,222,128,0.3); }
.source-tag[data-source="generated"] { color: var(--accent); border-color: rgba(91,141,239,0.3); }
.question-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
}

/* ---------- Marking guide ---------- */
.marking-section {
  margin-top: 18px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.marking-list { display: flex; flex-direction: column; gap: 12px; }
.marking-card {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.marking-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--border);
}
.marking-q {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
}
.marking-toggle {
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  width: 22px;
  height: 22px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.marking-toggle:hover { color: var(--text); border-color: var(--text-faint); }
.marking-body { padding: 12px 14px 14px; }
.marking-group { margin-bottom: 12px; }
.marking-group:last-child { margin-bottom: 0; }
.marking-group-label {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--text-faint);
  margin-bottom: 7px;
}
.marking-group.above .marking-group-label { color: var(--green); }
.tick-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.tick-list li {
  display: flex;
  gap: 8px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--text-dim);
}
.tick-list li .tick {
  color: var(--text-faint);
  flex-shrink: 0;
  user-select: none;
  cursor: pointer;
  width: 16px;
}
.marking-group.above .tick-list li .tick { color: rgba(74,222,128,0.5); }
.tick-list li:has(.tick.checked) { color: var(--text); text-decoration: line-through; text-decoration-color: var(--text-faint); }
.tick.checked { color: var(--green) !important; }

/* ---------- Progress pill (topbar) ---------- */
.progress-pill {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 11px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  cursor: default;
  white-space: nowrap;
}
.progress-pill .progress-dot { font-weight: 600; }
.progress-pill .progress-dot.viewed { color: var(--accent); }
.progress-pill .progress-dot.done { color: var(--green); }
.progress-pill .progress-sep { color: var(--text-faint); }

/* Progress filter buttons in sidebar */
.progress-filters .cat-item .cat-name::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}
.progress-filters .cat-item[data-progress="viewed"] .cat-name::before { background: var(--accent); }
.progress-filters .cat-item[data-progress="done"] .cat-name::before { background: var(--green); }
.progress-filters .cat-item[data-progress="todo"] .cat-name::before { background: var(--text-faint); }

/* Card progress badges */
.card { position: relative; }
.card-badge {
  position: absolute;
  top: 12px; right: 12px;
  width: 10px; height: 10px;
  border-radius: 50%;
  z-index: 1;
}
.card-badge.viewed { background: var(--accent); opacity: 0.7; }
.card-badge.done { background: var(--green); }
.card.done { border-color: rgba(74,222,128,0.35); }
.card.done .card-code { color: var(--green); }

/* ---------- Mobile filter toggle ---------- */
.mobile-filter-toggle {
  display: none;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
}

/* ---------- Timer bar ---------- */
.timer-bar {
  margin: -8px 0 22px;
  padding: 12px 16px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 12px;
  align-items: center;
}
.timer-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.timer-phase {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  font-weight: 600;
}
.timer-display {
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1;
}
.timer-bar.warning .timer-display { color: #fbbf24; }
.timer-bar.expired .timer-display { color: #f87171; }
.timer-bar.reading .timer-phase { color: var(--accent); }
.timer-bar.case .timer-phase { color: var(--green); }
.timer-controls { display: flex; gap: 6px; grid-row: 1; }
.timer-btn {
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  width: 34px; height: 34px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background .12s, color .12s;
}
.timer-btn:hover { background: var(--bg); color: var(--text); }
.timer-btn.phase-btn { font-size: 13px; }
.timer-progress-track {
  grid-column: 1 / -1;
  height: 4px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.timer-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width .3s linear, background .3s;
}
.timer-bar.case .timer-progress-fill { background: var(--green); }
.timer-bar.warning .timer-progress-fill { background: #fbbf24; }
.timer-bar.expired .timer-progress-fill { background: #f87171; }

/* ---------- Mark done bar ---------- */
.detail-actions-bar { margin: 18px 0 4px; }
.action-btn {
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-size: 13.5px;
  cursor: pointer;
  font-weight: 500;
  transition: background .12s, border-color .12s;
}
.action-btn:hover { background: var(--bg-elev); border-color: var(--text-faint); }
.action-btn.mark-done.completed {
  background: rgba(74,222,128,0.12);
  border-color: rgba(74,222,128,0.4);
  color: var(--green);
}

/* ---------- Mobile drawer ---------- */
.mobile-drawer { position: fixed; inset: 0; z-index: 60; }
.mobile-drawer-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(3px);
  cursor: pointer;
}
.mobile-drawer-content {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 80%; max-width: 320px;
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 20px;
  overflow-y: auto;
  animation: slideIn .22s ease;
}
@keyframes slideIn { from { transform: translateX(-100%); } to { transform: translateX(0); } }
.mobile-drawer-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-size: 16px;
  font-weight: 600;
}
.mobile-drawer-head .detail-close { position: static; }

/* scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #444c5a; }

/* highlight */
mark { background: rgba(91,141,239,0.3); color: var(--text); border-radius: 2px; padding: 0 1px; }

/* ---------- Responsive ---------- */

/* Tablet: hide sidebar, use drawer */
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; padding: 14px; gap: 14px; }
  .sidebar { display: none; }
  .mobile-filter-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .grid { grid-template-columns: 1fr; }
  .topbar-inner { padding: 10px 14px; gap: 10px; }
  .brand-sub { display: none; }
  .progress-pill { padding: 5px 9px; font-size: 11px; }
  .search-wrap { max-width: none; order: 3; flex-basis: 100%; }
}

/* Phone: compact timer, detail full-screen */
@media (max-width: 560px) {
  .layout { padding: 10px; }
  .toolbar { gap: 10px; }
  .sort-wrap label { display: none; }
  .detail {
    margin: 0; border-radius: 0;
    padding: 56px 16px 32px;
    min-height: 100vh;
    padding-top: env(safe-area-inset-top, 56px);
  }
  .detail-close { top: env(safe-area-inset-top, 12px); }
  .timer-bar { padding: 10px 12px; grid-template-columns: 1fr auto; }
  .timer-display { font-size: 24px; }
  .timer-btn { width: 32px; height: 32px; font-size: 13px; }
  .timer-controls { gap: 5px; }
  .detail-body { font-size: 15px; }
  .detail-body h1 { font-size: 18px; }
  .questions-heading { font-size: 14px; }
  .card-preview { font-size: 13px; -webkit-line-clamp: 3; }
  .brand-mark { font-size: 18px; }
  .brand-mark-sm { font-size: 13px; }
}

/* Landscape phone: timer controls wrap nicely */
@media (max-width: 400px) {
  .timer-bar { grid-template-columns: 1fr; }
  .timer-controls { justify-content: flex-end; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}