:root {
  --bg: #0b0e1a;
  --bg-panel: #131729;
  --bg-card: #171c33;
  --bg-card-hover: #1d2340;
  --border: #262c4a;
  --text: #eef0fb;
  --text-dim: #9aa1c4;
  --text-faint: #666d94;
  --accent: #5b8cff;
  --accent-2: #ffcf5b;
  --good: #4ade80;
  --bad: #ff5b6e;
  --radius: 16px;
  --radius-sm: 10px;
  font-size: 16px;
}

:root[data-theme="light"] {
  --bg: #f4f5fb;
  --bg-panel: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #eef0fc;
  --border: #dde0f2;
  --text: #1a1d2e;
  --text-dim: #565d7e;
  --text-faint: #8a8fb0;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f5fb;
    --bg-panel: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #eef0fc;
    --border: #dde0f2;
    --text: #1a1d2e;
    --text-dim: #565d7e;
    --text-faint: #8a8fb0;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-shell {
  max-width: 980px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

/* -------- Header / brand -------- */
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.brand .spark { font-size: 1.5rem; }
.brand small {
  display: block;
  font-weight: 500;
  font-size: 0.7rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* -------- Scoreboard -------- */
.scoreboard {
  background: linear-gradient(135deg, var(--bg-panel), var(--bg-card));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  cursor: pointer;
  transition: border-color .15s ease;
}
.scoreboard:hover { border-color: var(--accent); }

.sb-level {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 92px;
}
.sb-level-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) calc(var(--pct, 0) * 1%), var(--border) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
}
.sb-level-badge::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--bg-card);
}
.sb-level-badge span {
  position: relative;
  z-index: 1;
  font-weight: 800;
  font-size: 0.85rem;
}
.sb-level-label {
  font-size: 0.68rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.sb-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 64px;
}
.sb-stat .val {
  font-weight: 800;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 4px;
}
.sb-stat .lbl {
  font-size: 0.68rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.sb-xpbar-wrap {
  flex: 1;
  min-width: 140px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sb-xpbar {
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.sb-xpbar > div {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #8db4ff);
  border-radius: 999px;
  transition: width .4s ease;
}
.sb-xp-text {
  font-size: 0.68rem;
  color: var(--text-faint);
}
.sb-trophy-hint {
  font-size: 0.72rem;
  color: var(--text-faint);
  white-space: nowrap;
}

/* -------- Tabs -------- */
.tabs {
  display: flex;
  gap: 6px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px;
}
.tab-btn {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background .15s ease, color .15s ease;
}
.tab-btn.active {
  background: var(--accent);
  color: white;
}
.tab-btn:not(.active):hover {
  background: var(--bg-card-hover);
  color: var(--text);
}

/* -------- Panels -------- */
.panel { display: none; flex-direction: column; gap: 16px; }
.panel.active { display: flex; }

/* -------- Module grid (Sections tab, list view) -------- */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .12s ease, border-color .12s ease, background .12s ease;
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent-color, var(--accent));
}
.module-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color, var(--accent));
  background: var(--bg-card-hover);
}
.module-card .mc-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.module-card .mc-icon {
  font-size: 1.8rem;
  line-height: 1;
}
.module-card .mc-code {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-faint);
  letter-spacing: .06em;
  background: var(--bg);
  padding: 3px 8px;
  border-radius: 999px;
}
.module-card h3 {
  margin: 0;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}
.module-card p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.4;
}
.mc-progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
}
.mc-progress-bar {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.mc-progress-bar > div {
  height: 100%;
  border-radius: 999px;
  background: var(--accent-color, var(--accent));
}
.mc-progress-text {
  font-size: 0.7rem;
  color: var(--text-faint);
  white-space: nowrap;
}
.mc-complete-badge {
  font-size: 0.7rem;
  color: var(--good);
  font-weight: 700;
}

/* -------- Module detail (topic cards) -------- */
.module-detail-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.back-btn {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}
.back-btn:hover { background: var(--bg-card-hover); }

.module-detail-title { display: flex; flex-direction: column; gap: 2px; }
.module-detail-title h2 { margin: 0; font-size: 1.3rem; }
.module-detail-title span { font-size: 0.8rem; color: var(--text-dim); }

.topic-list { display: flex; flex-direction: column; gap: 10px; }

.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.topic-card summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}
.topic-card summary::-webkit-details-marker { display: none; }
.topic-card summary .tc-check {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  transition: all .15s ease;
}
.topic-card.done summary .tc-check {
  background: var(--good);
  border-color: var(--good);
  color: #06210f;
}
.topic-card summary .tc-tag {
  font-size: 0.68rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 700;
}
.topic-card summary .tc-chevron {
  margin-left: auto;
  color: var(--text-faint);
  transition: transform .15s ease;
}
.topic-card[open] summary .tc-chevron { transform: rotate(90deg); }
.topic-card .tc-body {
  padding: 0 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mark-read-btn {
  align-self: flex-start;
  border: none;
  background: var(--accent);
  color: white;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}
.mark-read-btn.done {
  background: var(--good);
  color: #06210f;
}
.mark-read-btn:disabled { cursor: default; }

/* content blocks */
.blk-intro { font-size: 0.95rem; color: var(--text-dim); line-height: 1.5; }
.blk-def { display: flex; flex-direction: column; gap: 8px; }
.blk-def .row { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; }
.blk-def .row .k { font-size: 0.68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--accent); font-weight: 800; margin-bottom: 4px; }
.blk-def .row .v { font-size: 0.88rem; color: var(--text); line-height: 1.45; }

.blk-numbered { display: flex; flex-direction: column; gap: 8px; }
.blk-title { font-size: 0.78rem; font-weight: 800; color: var(--text-faint); text-transform: uppercase; letter-spacing: .04em; margin-bottom: -2px; }
.num-item { display: flex; gap: 10px; align-items: flex-start; }
.num-item .n {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--border);
  color: var(--accent); font-weight: 800; font-size: 0.72rem;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px;
}
.num-item .txt b { display: block; font-size: 0.88rem; }
.num-item .txt span { font-size: 0.8rem; color: var(--text-dim); }

.blk-warning { background: rgba(255,91,110,0.08); border: 1px solid rgba(255,91,110,0.3); border-radius: var(--radius-sm); padding: 12px 14px; }
.blk-warning .blk-title { color: var(--bad); }
.blk-warning ul { margin: 6px 0 0; padding-left: 18px; }
.blk-warning li { font-size: 0.85rem; margin-bottom: 4px; color: var(--text); }

.blk-checklist ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.blk-checklist li { display: flex; gap: 8px; font-size: 0.88rem; align-items: flex-start; }
.blk-checklist li::before { content: "✓"; color: var(--good); font-weight: 800; flex-shrink: 0; }

.blk-golden { background: rgba(255,207,91,0.1); border: 1px solid rgba(255,207,91,0.35); border-radius: var(--radius-sm); padding: 12px 14px; font-size: 0.88rem; font-weight: 700; display: flex; gap: 8px; }
.blk-golden::before { content: "⚡"; }

.blk-tip { font-size: 0.82rem; color: var(--text-dim); font-style: italic; border-left: 3px solid var(--accent); padding-left: 10px; }

.blk-references { display: flex; flex-direction: column; gap: 8px; }
.ref-list { display: flex; flex-direction: column; gap: 6px; }
.ref-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}
.ref-item:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.ref-item .ref-icon { font-size: 1rem; flex-shrink: 0; }
.ref-item .ref-title { font-size: 0.85rem; font-weight: 600; flex: 1; }
.ref-item .ref-go { font-size: 0.85rem; color: var(--text-faint); flex-shrink: 0; }
.ref-item:hover .ref-go { color: var(--accent); }

.blk-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table.blk-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; min-width: 420px; }
table.blk-table th {
  background: var(--bg);
  text-align: left;
  padding: 8px 10px;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.blk-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}
table.blk-table tr:last-child td { border-bottom: none; }

/* -------- Quiz tab -------- */
.quiz-setup {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.quiz-setup h2 { margin: 0; font-size: 1.15rem; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}
.chip.active { background: var(--accent); border-color: var(--accent); color: white; }
.len-row { display: flex; gap: 8px; }
.start-quiz-btn {
  border: none;
  background: var(--accent);
  color: white;
  font-weight: 800;
  font-size: 1rem;
  padding: 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.start-quiz-btn:hover { filter: brightness(1.08); }

.quiz-live { display: flex; flex-direction: column; gap: 14px; }
.quiz-progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 700;
}
.quiz-progress-bar { flex: 1; height: 6px; border-radius: 999px; background: var(--border); overflow: hidden; }
.quiz-progress-bar > div { height: 100%; background: var(--accent); border-radius: 999px; transition: width .3s ease; }
.quiz-streak { display: flex; align-items: center; gap: 4px; color: var(--accent-2); }

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.question-card .q-mod-tag {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-faint);
  font-weight: 800;
}
.question-card h3 { margin: 0; font-size: 1.1rem; line-height: 1.4; }
.choice-list { display: flex; flex-direction: column; gap: 10px; }
.choice-btn {
  text-align: left;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all .1s ease;
}
.choice-btn:hover:not(:disabled) { border-color: var(--accent); background: var(--bg-card-hover); }
.choice-btn .letter {
  width: 24px; height: 24px; border-radius: 50%;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 800; flex-shrink: 0;
}
.choice-btn.correct { border-color: var(--good); background: rgba(74,222,128,0.12); }
.choice-btn.correct .letter { background: var(--good); border-color: var(--good); color: #06210f; }
.choice-btn.wrong { border-color: var(--bad); background: rgba(255,91,110,0.12); }
.choice-btn.wrong .letter { background: var(--bad); border-color: var(--bad); color: white; }
.choice-btn:disabled { cursor: default; }
.choice-btn:disabled:not(.correct):not(.wrong) { opacity: 0.5; }

.explain-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
  display: none;
}
.explain-box.show { display: block; }
.explain-box b { color: var(--text); }

.next-btn {
  align-self: flex-end;
  border: none;
  background: var(--accent);
  color: white;
  font-weight: 800;
  padding: 11px 22px;
  border-radius: 999px;
  cursor: pointer;
  display: none;
}
.next-btn.show { display: inline-flex; align-items: center; gap: 6px; }

/* quiz result */
.quiz-result {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.quiz-result .big-emoji { font-size: 3rem; }
.quiz-result h2 { margin: 0; }
.quiz-result .score-line { font-size: 1.1rem; color: var(--text-dim); }
.result-stats { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; margin: 6px 0; }
.result-stats .rs { display: flex; flex-direction: column; }
.result-stats .rs .v { font-weight: 800; font-size: 1.3rem; }
.result-stats .rs .l { font-size: 0.7rem; color: var(--text-faint); text-transform: uppercase; }
.result-badges { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.badge-pill {
  background: rgba(255,207,91,0.15);
  border: 1px solid rgba(255,207,91,0.4);
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 999px;
}
.result-actions { display: flex; gap: 10px; margin-top: 8px; }
.result-actions button {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-weight: 700;
  padding: 11px 18px;
  border-radius: 999px;
  cursor: pointer;
}
.result-actions button.primary { background: var(--accent); border-color: var(--accent); color: white; }
.result-actions button.danger { background: transparent; border-color: rgba(255,91,91,0.4); color: #ff5b5b; }
.result-actions button.danger:hover { background: rgba(255,91,91,0.12); }

/* -------- Trophy modal -------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.55);
  display: none; align-items: center; justify-content: center; z-index: 50;
  padding: 20px;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.modal-header { display: flex; align-items: center; justify-content: space-between; }
.modal-header h2 { margin: 0; }
.modal-close {
  border: none; background: var(--bg-card); color: var(--text);
  width: 32px; height: 32px; border-radius: 50%; cursor: pointer; font-size: 1rem;
}
.trophy-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
.trophy {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  opacity: 0.35;
}
.trophy.earned { opacity: 1; border-color: var(--accent-2); }
.trophy .t-icon { font-size: 1.6rem; }
.trophy .t-name { font-size: 0.75rem; font-weight: 800; }
.trophy .t-desc { font-size: 0.65rem; color: var(--text-faint); }

.module-mastery-row { display: flex; align-items: center; gap: 10px; font-size: 0.82rem; }
.module-mastery-row .mm-icon { font-size: 1.1rem; }
.module-mastery-row .mm-name { flex: 0 0 130px; font-weight: 700; }
.module-mastery-row .mm-bar { flex: 1; height: 6px; border-radius: 999px; background: var(--border); overflow: hidden; }
.module-mastery-row .mm-bar > div { height: 100%; border-radius: 999px; }
.module-mastery-row .mm-pct { width: 36px; text-align: right; color: var(--text-faint); font-size: 0.72rem; }

/* -------- Toast -------- */
#toast-stack {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--bg-panel);
  border: 1px solid var(--accent-2);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  animation: toast-in .25s ease, toast-out .25s ease 2.4s forwards;
  display: flex; align-items: center; gap: 8px;
}
@keyframes toast-in { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(-10px); } }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-dim); }

/* -------- Diagrams -------- */
.diagram-wrap {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  justify-content: center;
}
.diagram-wrap svg { max-width: 320px; }

/* -------- Bench simulations (game objects) -------- */
.sim-mount { min-height: 40px; }
.sim-widget {
  background: linear-gradient(160deg, var(--bg-card), var(--bg));
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sim-widget-title {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--accent);
}
.sim-stage {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.sim-meter { width: 160px; flex-shrink: 0; }
.sim-component { flex: 1 1 200px; min-width: 180px; }
.sim-bb-stage, .sim-scope-stage {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  justify-content: center;
}

.sim-controls { display: flex; flex-direction: column; gap: 10px; }
.sim-dial-row, .sim-probe-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.sim-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-faint);
  white-space: nowrap;
}
.sim-mode-row { display: flex; gap: 6px; flex-wrap: wrap; }
.sim-mode-btn {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-weight: 800;
  font-size: 0.82rem;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
}
.sim-mode-btn.active { background: var(--accent); border-color: var(--accent); color: white; }
.sim-mode-btn:hover:not(.active) { border-color: var(--accent); }

.sim-probe-btn {
  border: none;
  background: var(--accent-2);
  color: #241c00;
  font-weight: 800;
  font-size: 0.85rem;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
}
.sim-probe-btn:hover { filter: brightness(1.05); }

.sim-hint {
  background: rgba(255,207,91,0.1);
  border: 1px solid rgba(255,207,91,0.35);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 0.82rem;
}

.sim-verdict-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.sim-prompt { font-size: 0.85rem; font-weight: 700; }
.sim-verdict-btns { display: flex; gap: 8px; }
.sim-verdict-btn {
  border: none;
  font-weight: 800;
  font-size: 0.85rem;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  color: white;
}
.sim-verdict-btn.good { background: var(--good); color: #06210f; }
.sim-verdict-btn.bad { background: var(--bad); }
.sim-verdict-btn:hover { filter: brightness(1.08); }

.sim-feedback {
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
}
.sim-feedback.ok { background: rgba(74,222,128,0.12); border: 1px solid rgba(74,222,128,0.4); }
.sim-feedback.no { background: rgba(255,91,110,0.12); border: 1px solid rgba(255,91,110,0.4); }

.sim-retry-btn {
  align-self: flex-start;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-weight: 700;
  font-size: 0.82rem;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
}
.sim-retry-btn:hover { border-color: var(--accent); }

.bb-hole { cursor: pointer; transition: fill .1s ease; }
.bb-hole:hover { fill: #ffcf5b !important; }

/* -------- Inline micro-quiz (interleaved check) -------- */
.check-widget {
  background: var(--bg);
  border: 1px dashed var(--accent);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.check-label {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--accent);
}
.check-q { font-size: 0.92rem; font-weight: 700; }
.check-progress {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-faint);
}
.check-passed {
  background: rgba(74,222,128,0.12);
  border: 1px solid rgba(74,222,128,0.4);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
}
.wrong-reasons-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
  display: none;
}
.wrong-reasons-box.show { display: block; }
.wrong-reasons-box b { color: var(--text); }
.wrong-reasons-box ul { margin: 8px 0 0; padding-left: 18px; display: flex; flex-direction: column; gap: 4px; }

@media (max-width: 560px) {
  .scoreboard { padding: 12px; gap: 10px; }
  .sb-stat { min-width: 50px; }
  .brand { font-size: 1.05rem; }
}

/* -------- Auth -------- */
.app-loading {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-weight: 700;
}
.auth-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.auth-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 380px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.auth-card .brand { justify-content: center; text-align: left; }
.auth-card h2 { margin: 0; text-align: center; }
#auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-field { display: flex; flex-direction: column; gap: 6px; font-size: 0.82rem; font-weight: 700; color: var(--text-dim); }
.auth-field input {
  font: inherit;
  font-weight: 500;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
}
.auth-field input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.auth-error {
  font-size: 0.82rem;
  color: var(--bad);
  min-height: 1em;
}
.auth-submit {
  border: none;
  background: var(--accent);
  color: white;
  font-weight: 800;
  font: inherit;
  padding: 12px 18px;
  border-radius: 999px;
  cursor: pointer;
}
.auth-submit:disabled { opacity: 0.6; cursor: default; }
.auth-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.auth-switch button {
  border: none;
  background: none;
  color: var(--accent);
  font-weight: 800;
  font: inherit;
  cursor: pointer;
  padding: 0;
}
.auth-note { font-size: 0.78rem; color: var(--text-faint); text-align: center; min-height: 1em; }
.auth-user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-faint);
}
.logout-btn {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  font: inherit;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 7px 12px;
  border-radius: 999px;
  cursor: pointer;
}
.logout-btn:hover { border-color: var(--accent); color: var(--text); }
.all-courses-link {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-faint);
  text-decoration: none;
}
.all-courses-link:hover { color: var(--accent); }
@media (max-width: 560px) {
  .auth-user-info span { display: none; }
}

/* ================================================================
   Component Quest — flashcard-specific styles
   ================================================================ */

/* -------- Question images -------- */
.q-image-wrap {
  display: flex;
  justify-content: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
}
.q-image {
  max-width: 100%;
  max-height: 240px;
  object-fit: contain;
  border-radius: 6px;
}
.q-def { font-style: italic; font-weight: 600; }
.q-sub {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-faint);
}

/* -------- Image answer grid (pick-the-photo questions) -------- */
.img-choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}
.img-choice {
  border: 2px solid var(--border);
  background: #ffffff;
  border-radius: var(--radius-sm);
  padding: 6px;
  cursor: pointer;
  transition: border-color .12s ease, transform .12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 110px;
}
.img-choice:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-2px); }
.img-choice img { max-width: 100%; max-height: 130px; object-fit: contain; border-radius: 6px; }
.img-choice.correct { border-color: var(--good); box-shadow: 0 0 0 3px rgba(74,222,128,0.25); }
.img-choice.wrong { border-color: var(--bad); box-shadow: 0 0 0 3px rgba(255,91,110,0.25); }
.img-choice:disabled { cursor: default; }
.img-choice:disabled:not(.correct):not(.wrong) { opacity: 0.45; }

/* -------- Answer reveal card -------- */
.reveal-box {
  border-radius: var(--radius-sm);
  padding: 14px;
  display: none;
  flex-direction: column;
  gap: 10px;
}
.answer-reveal .reveal-box { display: flex; }
.reveal-box.ok { background: rgba(74,222,128,0.1); border: 1px solid rgba(74,222,128,0.35); }
.reveal-box.no { background: rgba(255,91,110,0.1); border: 1px solid rgba(255,91,110,0.35); }
.reveal-head { font-size: 0.95rem; }
.reveal-media { display: flex; gap: 10px; flex-wrap: wrap; }
.reveal-img {
  max-height: 90px;
  max-width: 150px;
  object-fit: contain;
  background: #ffffff;
  border-radius: 8px;
  padding: 4px;
  border: 1px solid var(--border);
}
.reveal-text { font-size: 0.85rem; color: var(--text-dim); line-height: 1.5; }

/* -------- Card chips (level detail / review / browse grids) -------- */
.card-chip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 10px;
}
.card-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
  transition: border-color .12s ease, background .12s ease;
}
.card-chip:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.card-chip img {
  width: 52px;
  height: 52px;
  object-fit: contain;
  background: #ffffff;
  border-radius: 8px;
  flex-shrink: 0;
  padding: 2px;
}
.chip-noimg {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  background: var(--bg);
  border-radius: 8px;
  flex-shrink: 0;
}
.chip-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.chip-name {
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.25;
}
.pips { display: inline-flex; gap: 3px; }
.pip {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--border);
}
.pip.on { background: var(--accent-2); }

/* -------- Level actions -------- */
.level-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.level-action {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: var(--radius);
  padding: 16px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-start;
  transition: border-color .12s ease, transform .12s ease;
}
.level-action small { font-weight: 500; font-size: 0.75rem; color: var(--text-dim); }
.level-action:hover { transform: translateY(-2px); }
.level-action.study:hover { border-color: var(--accent-2); }
.level-action.quiz { background: var(--accent); border-color: var(--accent); color: white; }
.level-action.quiz small { color: rgba(255,255,255,0.75); }
.level-action.quiz:hover { filter: brightness(1.08); }
@media (max-width: 560px) {
  .level-actions { grid-template-columns: 1fr; }
}

.level-card.locked { opacity: 0.55; cursor: not-allowed; }
.level-card.locked:hover { transform: none; border-color: var(--border); background: var(--bg-card); }

/* -------- Study flashcard -------- */
.flashcard {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 340px;
  cursor: pointer;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow: hidden;
  transition: border-color .15s ease;
  perspective: 1000px;
}
.flashcard:hover { border-color: var(--accent); }
.fc-face {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  width: 100%;
  animation: fc-in .28s ease;
}
@keyframes fc-in {
  from { opacity: 0.2; transform: rotateY(70deg); }
  to { opacity: 1; transform: rotateY(0deg); }
}
.fc-front { background: #ffffff; }
.fc-front img { max-height: 260px; max-width: 100%; object-fit: contain; }
.fc-noimg { font-size: 4rem; }
.fc-hint {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: #8a8fb0;
}
.fc-back { text-align: center; }
.fc-name { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.01em; }
.fc-def { font-size: 0.95rem; color: var(--text); line-height: 1.5; max-width: 560px; }
.fc-sym {
  max-height: 110px;
  max-width: 200px;
  object-fit: contain;
  background: #ffffff;
  border-radius: 8px;
  padding: 6px;
  border: 1px solid var(--border);
}
.fc-detail { font-size: 0.82rem; color: var(--text-dim); line-height: 1.5; max-width: 560px; }

.study-nav { display: flex; gap: 10px; justify-content: center; }
.study-btn {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 11px 20px;
  border-radius: 999px;
  cursor: pointer;
}
.study-btn:hover:not(:disabled) { border-color: var(--accent); }
.study-btn:disabled { opacity: 0.4; cursor: default; }
.study-btn.flip { border-color: var(--accent-2); color: var(--accent-2); font-weight: 800; }
.study-btn.primary { background: var(--accent); border-color: var(--accent); color: white; font-weight: 800; }

/* -------- Lightning -------- */
.lightning-btn { background: linear-gradient(90deg, #ffb84d, #ff8c5b); color: #241c00; }
.lightning-hud {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.lightning-timer { display: flex; align-items: center; gap: 10px; }
.lightning-timebar {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.lightning-timebar > div {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #ffb84d, #ff5b6e);
  transition: width .2s linear;
}
.lightning-timer span { font-weight: 800; font-size: 0.9rem; min-width: 36px; text-align: right; }
.lightning-stats {
  display: flex;
  gap: 16px;
  font-weight: 800;
  font-size: 0.9rem;
}
.lightning-stats .combo { color: var(--accent-2); }
.lightning-q h3 { text-align: center; }

/* -------- Browse -------- */
.browse-search {
  font: inherit;
  width: 100%;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 13px 20px;
}
.browse-search:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.browse-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }

/* -------- Card modal -------- */
.card-modal-media {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 10px 0;
}
.card-modal-media img {
  max-height: 150px;
  max-width: 46%;
  object-fit: contain;
  background: #ffffff;
  border-radius: 10px;
  padding: 6px;
  border: 1px solid var(--border);
  flex: 1 1 40%;
}

/* ================================================================
   Trainer dashboard
   ================================================================ */

.stat-strip {
  display: flex;
  gap: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  flex-wrap: wrap;
}
.stat-strip .rs { display: flex; flex-direction: column; }
.stat-strip .rs .v { font-weight: 800; font-size: 1.3rem; }
.stat-strip .rs .l { font-size: 0.7rem; color: var(--text-faint); text-transform: uppercase; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}
table.admin-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; min-width: 640px; }
table.admin-table th {
  background: var(--bg);
  text-align: left;
  padding: 10px 12px;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
table.admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
table.admin-table tbody tr { cursor: pointer; transition: background .1s ease; }
table.admin-table tbody tr:hover { background: var(--bg-card-hover); }
table.admin-table tr:last-child td { border-bottom: none; }
table.admin-table td.num { text-align: right; font-variant-numeric: tabular-nums; font-weight: 700; }
.course-icons { margin-left: 6px; font-size: 0.9rem; }
.dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--border);
  margin-right: 8px;
}
.dot.on { background: var(--good); }
.you-tag {
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 6px;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.xp-chart { width: 100%; height: auto; color: var(--text); }
.chart-legend { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 8px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 0.78rem; font-weight: 700; color: var(--text-dim); }
.legend-item .swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

.reset-list { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 8px; font-size: 0.85rem; }
.event-list { display: flex; flex-direction: column; gap: 2px; max-height: 420px; overflow-y: auto; }
.event-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 0.82rem;
  padding: 6px 4px;
  border-bottom: 1px solid var(--border);
}
.event-row:last-child { border-bottom: none; }
.event-row .ev-time { color: var(--text-faint); font-size: 0.72rem; white-space: nowrap; min-width: 118px; }
.event-row .ev-course { flex-shrink: 0; }

/* heatmap */
.heatmap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  overflow-x: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hm-row { display: flex; align-items: center; gap: 3px; cursor: pointer; }
.hm-row.hm-head { cursor: default; }
.hm-row:not(.hm-head):hover .hm-name { color: var(--accent); }
.hm-name {
  width: 190px;
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.hm-cell, .hm-cell-label {
  width: 16px; height: 16px;
  flex-shrink: 0;
  border-radius: 4px;
}
.hm-cell-label { font-size: 0.55rem; color: var(--text-faint); height: auto; overflow: visible; white-space: nowrap; }
.hm-cell.l0 { background: var(--border); opacity: 0.45; }
.hm-cell.l1 { background: #3b5bdb55; }
.hm-cell.l2 { background: #3b5bdb99; }
.hm-cell.l3 { background: #3b5bdbcc; }
.hm-cell.l4 { background: #3b5bdb; }

.add-admin-row { display: flex; gap: 10px; flex-wrap: wrap; }
.add-admin-row .browse-search { flex: 1; min-width: 220px; }

.student-cell { display: inline-flex; flex-direction: column; vertical-align: middle; }
.student-cell small { color: var(--text-faint); font-size: 0.68rem; font-weight: 500; }

/* -------- Approval controls -------- */
.pending-chip {
  font-size: 0.65rem;
  font-weight: 800;
  color: #b8860b;
  background: rgba(255,207,91,0.18);
  border: 1px solid rgba(255,207,91,0.5);
  border-radius: 999px;
  padding: 1px 8px;
  vertical-align: middle;
}
.pending-box {
  background: rgba(255,207,91,0.08);
  border: 1px solid rgba(255,207,91,0.45);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pending-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}
.pending-row small { color: var(--text-faint); margin-left: 6px; }
.approve-btn {
  border: none;
  background: var(--good);
  color: #06210f;
  font: inherit;
  font-weight: 800;
  font-size: 0.82rem;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
}
.approve-btn:hover { filter: brightness(1.05); }
.approval-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}