/* css/tracker.css — Exam selector, stats dashboard, filter bar, subject cards, topic rows */

/* Main wrapper */
.tracker-wrapper { max-width: 960px; margin: 0 auto; padding: 20px 16px; }

/* Exam selector */
.exam-selector {
  display: flex; gap: 8px; margin-bottom: 16px;
  overflow-x: auto; padding-bottom: 4px;
}
.exam-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text-sec);
  font-size: 13px; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: all var(--dur) var(--ease);
  white-space: nowrap;
}
.exam-btn:hover { border-color: var(--border-glow); background: var(--bg-hover); }
.exam-btn.active[data-exam="ras"] { border-color: var(--ras); color: var(--ras); box-shadow: var(--shadow-glow-ras); background: #6366f10d; }
.exam-btn.active[data-exam="gk"]  { border-color: var(--gk);  color: var(--gk);  box-shadow: var(--shadow-glow-gk);  background: #10b9810d; }
.exam-btn.active[data-exam="sci"] { border-color: var(--sci); color: var(--sci); box-shadow: var(--shadow-glow-sci); background: #f59e0b0d; }

/* Stats dashboard row */
.stats-dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex; align-items: center; gap: 12px;
  transition: border-color var(--dur) var(--ease);
}
.stat-card:hover { border-color: var(--border-glow); }
.stat-icon {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.stat-icon.ic-total    { background: #6366f118; color: var(--ras); }
.stat-icon.ic-done     { background: #10b98118; color: var(--gk); }
.stat-icon.ic-revision { background: #a855f718; color: var(--purple); }
.stat-icon.ic-bookmark { background: #f59e0b18; color: var(--sci); }
.stat-info { display: flex; flex-direction: column; }
.stat-val { font-size: 20px; font-weight: 700; line-height: 1.1; }
.stat-label { font-size: 11px; color: var(--text-muted); font-weight: 500; }

/* Overall ring in stats */
.overall-ring-wrap {
  position: relative; width: 42px; height: 42px; flex-shrink: 0;
}
.overall-ring-wrap svg { transform: rotate(-90deg); width: 42px; height: 42px; }
.overall-ring-bg  { fill: none; stroke: var(--border); stroke-width: 4; }
.overall-ring-fg  { fill: none; stroke: var(--gk); stroke-width: 4;
  stroke-dasharray: 213.6; stroke-dashoffset: 213.6;
  stroke-linecap: round; transition: stroke-dashoffset .6s var(--ease);
}
.overall-pct-label {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}

/* Filter bar */
.filter-bar {
  display: flex; gap: 6px; margin-bottom: 16px;
  flex-wrap: wrap; align-items: center;
}
.filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--border); border-radius: 999px;
  background: transparent; color: var(--text-muted);
  font-size: 12px; font-weight: 500; font-family: inherit;
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.filter-btn:hover { border-color: var(--border-glow); color: var(--text-sec); }
.filter-btn.active { border-color: var(--ras); color: var(--ras); background: #6366f10d; }

/* Search */
.search-wrap {
  margin-left: auto;
  position: relative;
}
.search-wrap input {
  width: 200px; padding: 7px 12px 7px 32px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text); font-size: 12.5px; font-family: inherit;
  transition: border-color var(--dur) var(--ease);
}
.search-wrap input:focus { outline: none; border-color: var(--ras); }
.search-wrap svg {
  position: absolute; left: 9px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; color: var(--text-muted);
}

/* Subject cards */
.subject-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  contain: content;
}
.subject-card:hover { border-color: var(--subj-color, var(--border-glow)); }
.subject-card.open { border-left: 3px solid var(--subj-color, var(--ras)); }
.subject-card.all-complete { border-left: 3px solid var(--gk); background: #10b98106; }

.subject-header {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
}

.subject-ring-wrap { position: relative; width: 44px; height: 44px; flex-shrink: 0; }
.subject-ring-wrap svg { width: 44px; height: 44px; transform: rotate(-90deg); }
.subj-ring-bg   { fill: none; stroke: var(--border); stroke-width: 4; }
.subj-ring-fill {
  fill: none; stroke: var(--subj-color, var(--ras)); stroke-width: 4;
  stroke-dasharray: 138; stroke-dashoffset: 138;
  stroke-linecap: round;
  transition: stroke-dashoffset .5s var(--ease);
}
.subject-ring-pct {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700;
}

.subject-info { flex: 1; min-width: 0; }
.subject-title { font-size: 14px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.subject-meta { font-size: 11px; color: var(--text-muted); }

.subject-progress-bar-wrap { width: 100px; flex-shrink: 0; }
.subject-progress-bar {
  height: 4px; background: var(--border); border-radius: 2px; overflow: hidden;
}
.subject-progress-fill {
  height: 100%; background: var(--subj-color, var(--ras)); border-radius: 2px;
  transition: width .4s var(--ease);
}
.subject-progress-text { font-size: 10px; color: var(--text-muted); margin-top: 2px; text-align: right; }

.subject-chevron {
  color: var(--text-muted); transition: transform .3s var(--ease);
  display: flex; align-items: center;
}
.subject-card.open .subject-chevron { transform: rotate(180deg); }

/* Topics body */
.topics-body {
  max-height: 0; overflow: hidden;
  transition: max-height .35s var(--ease);
}
.subject-card.open .topics-body { max-height: 5000px; }
.topics-list { padding: 0 16px 12px; }

/* Topic row */
.topic-row {
  border-left: 2px solid transparent;
  padding: 6px 8px;
  border-radius: var(--radius-xs);
  margin-bottom: 2px;
  transition: all .15s var(--ease);
}
.topic-row:hover { background: var(--bg-hover); border-left-color: var(--ras); }
.topic-row.completed { opacity: .55; }
.topic-row.completed:hover { opacity: .75; }
.topic-row.depth-1 { padding-left: 24px; }
.topic-row.depth-2 { padding-left: 40px; }

.topic-row-header {
  display: flex; align-items: center; gap: 8px;
  cursor: pointer;
  min-height: 28px;
}

/* Leaf dot */
.leaf-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--border-glow); flex-shrink: 0;
}

/* Expand button */
.expand-btn-badge {
  background: none; border: none; color: var(--text-muted);
  cursor: pointer; font-size: 10px; padding: 2px;
  transition: transform .2s var(--ease);
}
.expand-btn-badge .arrow { display: inline-block; transition: transform .2s var(--ease); }
.topic-row.expanded > .topic-row-header .expand-btn-badge .arrow { transform: rotate(90deg); }

/* Checkbox */
.topic-checkbox {
  width: 16px; height: 16px; accent-color: var(--ras);
  cursor: pointer; flex-shrink: 0;
}

/* Title */
.topic-title {
  flex: 1; font-size: 13px; line-height: 1.4;
  min-width: 0; overflow: hidden; text-overflow: ellipsis;
}

/* Level badges */
.level-badge {
  padding: 1px 6px; border-radius: 3px;
  font-size: 9px; font-weight: 700; text-transform: uppercase;
  flex-shrink: 0;
}
.level-badge.sr-sec { background: #6366f118; color: var(--ras); }
.level-badge.grad   { background: #a855f718; color: var(--purple); }

/* Revision pill */
.rev-pill {
  padding: 1px 7px; border-radius: 999px;
  font-size: 9px; font-weight: 700;
}
.rev-pill.r1 { background: #f59e0b22; color: var(--sci); }
.rev-pill.r2 { background: #a855f722; color: var(--purple); }
.rev-pill.r3 { background: #10b98122; color: var(--gk); }

/* Subtopic count badge */
.subtopic-count-badge {
  padding: 1px 7px; border-radius: 999px;
  font-size: 9px; font-weight: 600; color: var(--text-muted);
  background: var(--bg-surface);
}
.subtopic-count-badge.all-done { background: #10b98122; color: var(--gk); }

/* Has-notes dot */
.has-notes-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: transparent; flex-shrink: 0;
  transition: background .2s;
}
.topic-row.has-notes .has-notes-dot { background: var(--sci); }

/* Topic action buttons */
.topic-actions {
  display: flex; gap: 4px; flex-shrink: 0;
  transition: opacity .15s var(--ease);
}
/* Non-active action buttons hidden until hover */
.topic-actions .action-btn:not(.active-revision):not(.active-bookmark) {
  opacity: 0; transition: opacity .15s var(--ease);
}
.topic-row:hover .topic-actions .action-btn { opacity: 1; }
/* Active revision/bookmark buttons ALWAYS visible */
.action-btn.active-revision, .action-btn.active-bookmark { opacity: 1 !important; }

.action-btn {
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: var(--radius-xs);
  background: transparent; color: var(--text-muted);
  cursor: pointer; transition: all .15s var(--ease);
  font-family: inherit;
}
.action-btn:hover { border-color: var(--ras); color: var(--ras); background: #6366f10d; }
.action-btn.active-revision { border-color: var(--purple); color: var(--purple); background: #a855f718; }
.action-btn.active-bookmark { border-color: var(--sci);    color: var(--sci);    background: #f59e0b18; }

/* Children container */
.topic-children { padding-left: 4px; }

/* No results */
.no-results, .empty-state {
  text-align: center; padding: 40px 20px;
  color: var(--text-muted); font-size: 14px;
}

/* Shimmer skeleton */
.shimmer-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin-bottom: 10px;
}
.shimmer-row { display: flex; align-items: center; gap: 14px; }
.shimmer-ring { width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0; }
.shimmer-lines { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.shimmer-line { height: 12px; border-radius: 4px; }
.shimmer-line.long  { width: 70%; }
.shimmer-line.short { width: 40%; }
.shimmer {
  background: linear-gradient(90deg, var(--bg-card-2) 25%, var(--bg-hover) 50%, var(--bg-card-2) 75%);
  background-size: 200% 100%;
  animation: shimmerAnim 1.5s infinite;
}
@keyframes shimmerAnim {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@media (max-width: 640px) {
  .tracker-wrapper { padding: 10px 8px; }
  .subject-progress-bar-wrap { display: none; }
  .exam-selector { gap: 4px; flex-wrap: wrap; }
  .exam-btn { padding: 8px 10px; font-size: 11px; flex: 1; min-width: 0; text-align: center; }
  .exam-btn .exam-badge { display: none; }
  .stats-dashboard { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .stat-card { padding: 10px; }
  .filter-bar { overflow-x: auto; flex-wrap: nowrap; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .filter-bar::-webkit-scrollbar { display: none; }
  .filter-btn { white-space: nowrap; flex-shrink: 0; }
  .search-wrap input { width: 120px; font-size: 12px; }
  .topic-actions { opacity: 1; }
  .topic-actions .action-btn { opacity: 1; width: 32px; height: 32px; }
  .subject-header { padding: 10px 12px; gap: 8px; }
  .subject-ring-wrap { width: 36px; height: 36px; }
  .subject-ring-wrap svg { width: 36px; height: 36px; }
  .subject-ring-pct { font-size: 8px; }
  .subject-title { font-size: 13px; }
  .topic-row-header { padding: 6px 8px; }
  .modal-content { margin: 10px; }
  .notes-editor { min-height: 150px; }
}