:root {
  color-scheme: light;
  --bg: linear-gradient(135deg, #f8f4ff 0%, #eef7ff 45%, #ecfff5 100%);
  --card: #ffffff;
  --text: #12233a;
  --muted: #526277;
  --primary: #5b3df2;
  --primary-hover: #452ed0;
  --secondary: #00a3a3;
  --accent: #ff8b2c;
  --ok: #117a37;
  --bad: #b42318;
  --border: #d6dff0;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: linear-gradient(135deg, #111827 0%, #0f172a 45%, #0b1d1d 100%);
  --card: #101a2a;
  --text: #e6edf7;
  --muted: #b0bfd4;
  --primary: #7c66ff;
  --primary-hover: #9a88ff;
  --secondary: #19bcbc;
  --accent: #ffae62;
  --ok: #4ee084;
  --bad: #ff7d7d;
  --border: #2a3a52;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Rubik", "Arial", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app-version-footer {
  display: block;
  width: 100%;
  text-align: center;
  padding: 14px 8px 20px;
  font-size: 12px;
  color: var(--muted, #888);
  opacity: 0.65;
  user-select: none;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 6px 22px rgba(39, 56, 85, 0.08);
}

.card:nth-of-type(1) {
  background: linear-gradient(135deg, #ffffff 0%, #f2f7ff 100%);
}

.card:nth-of-type(2) {
  background: linear-gradient(135deg, #ffffff 0%, #f8f3ff 100%);
}

.card:nth-of-type(3) {
  background: linear-gradient(135deg, #ffffff 0%, #f1fff8 100%);
}

.card:nth-of-type(4) {
  background: linear-gradient(135deg, #ffffff 0%, #fff9f1 100%);
}

body[data-theme="dark"] .card {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}

body[data-theme="dark"] .card:nth-of-type(1) {
  background: linear-gradient(135deg, #1a2540 0%, #152034 100%);
}

body[data-theme="dark"] .card:nth-of-type(2) {
  background: linear-gradient(135deg, #211b3f 0%, #1a2035 100%);
}

body[data-theme="dark"] .card:nth-of-type(3) {
  background: linear-gradient(135deg, #16322c 0%, #142537 100%);
}

body[data-theme="dark"] .card:nth-of-type(4) {
  background: linear-gradient(135deg, #372518 0%, #1b2438 100%);
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

h1, h2, h3 {
  margin: 0 0 10px;
}

.field {
  margin: 14px 0;
}

.label {
  margin: 0 0 8px;
  font-weight: 500;
}

input[type="number"],
input[type="text"] {
  width: 220px;
  max-width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: #fff;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
}

select {
  width: 280px;
  max-width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: #fff;
  color: var(--text);
}

body[data-theme="dark"] select,
body[data-theme="dark"] input[type="number"],
body[data-theme="dark"] input[type="text"] {
  background: #162236;
  color: var(--text);
}

.lecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.lecture-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  background: linear-gradient(135deg, #f3fbff 0%, #f6f0ff 100%);
}

body[data-theme="dark"] .lecture-item {
  background: linear-gradient(135deg, #1a2f3f 0%, #2a2242 100%);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.actions.compact {
  margin-top: 0;
}

.btn {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #ffffff 0%, #f2f7ff 100%);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 15px;
  text-decoration: none;
  display: inline-block;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

body[data-theme="dark"] .btn {
  background: linear-gradient(135deg, #1a2b44 0%, #22243e 100%);
  color: #e8f0ff;
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary) 0%, #7a5cff 100%);
  color: #fff;
  border-color: transparent;
}

.btn.primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #6348ee 100%);
}

body[data-theme="dark"] .btn.primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #7d68ff 100%);
}

#theme-toggle {
  white-space: nowrap;
}

#reset-setup {
  border-color: #cfe9e9;
  background: linear-gradient(135deg, #ecffff 0%, #f4fffb 100%);
  color: #056464;
}

body[data-theme="dark"] #reset-setup {
  border-color: #2f5f5f;
  background: linear-gradient(135deg, #173434 0%, #143141 100%);
  color: #9ee7e7;
}

#next-question {
  border-color: #ffd9b8;
  background: linear-gradient(135deg, #fff4e9 0%, #ffe9d2 100%);
  color: #8a4a10;
}

body[data-theme="dark"] #next-question {
  border-color: #6f4a2f;
  background: linear-gradient(135deg, #3d2a1a 0%, #42311c 100%);
  color: #ffd7a8;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.quiz-state-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.meta {
  margin: 8px 0;
  color: #2f5fa8;
  font-size: 14px;
  font-weight: 600;
}

body[data-theme="dark"] .meta {
  color: #8cc2ff;
}

.question {
  margin-top: 6px;
  white-space: pre-line;
}

.choices {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.confidence-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.confidence-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  background: linear-gradient(135deg, #ffffff 0%, #f7fbff 100%);
}

body[data-theme="dark"] .confidence-option {
  background: linear-gradient(135deg, #172337 0%, #1a2a3f 100%);
}

.choice {
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  background: linear-gradient(135deg, #ffffff 0%, #f7fbff 100%);
}

.choice:hover {
  border-color: #b7c8ea;
  background: linear-gradient(135deg, #ffffff 0%, #eef5ff 100%);
}

body[data-theme="dark"] .choice {
  background: linear-gradient(135deg, #172337 0%, #1a2a3f 100%);
}

body[data-theme="dark"] .choice:hover {
  border-color: #4a6b96;
  background: linear-gradient(135deg, #1d2d45 0%, #1e3451 100%);
}

.choice input {
  margin-left: 8px;
}

.feedback {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  background: linear-gradient(135deg, #fbfcff 0%, #f4f9ff 100%);
}

.feedback.ok {
  border-color: #b7ebc9;
  background: #f1fcf4;
}

.feedback.bad {
  border-color: #f3c6c6;
  background: #fff3f3;
}

body[data-theme="dark"] .feedback {
  background: linear-gradient(135deg, #152235 0%, #162b42 100%);
}

body[data-theme="dark"] .feedback.ok {
  border-color: #2f7a4b;
  background: #162f21;
}

body[data-theme="dark"] .feedback.bad {
  border-color: #844848;
  background: #3a1f1f;
}

.status {
  font-weight: 700;
  color: #4d2cc8;
}

body[data-theme="dark"] .status {
  color: #b7a8ff;
}

.muted {
  color: var(--muted);
}

.question-bank {
  margin-top: 10px;
  display: grid;
  gap: 8px;
  max-height: 420px;
  overflow: auto;
  padding-left: 2px;
}

.bank-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  background: linear-gradient(135deg, #ffffff 0%, #f6faff 100%);
}

body[data-theme="dark"] .bank-item {
  background: linear-gradient(135deg, #172539 0%, #1a2f49 100%);
}

.files-library {
  display: grid;
  gap: 14px;
}

.file-group {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: linear-gradient(135deg, #ffffff 0%, #f6fbff 100%);
}

body[data-theme="dark"] .file-group {
  background: linear-gradient(135deg, #172539 0%, #1a2f49 100%);
}

.file-group-title {
  margin: 0 0 8px;
  font-size: 17px;
}

.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 10px;
}

.file-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: linear-gradient(135deg, #ffffff 0%, #f3f8ff 100%);
}

body[data-theme="dark"] .file-item {
  background: linear-gradient(135deg, #1c2a41 0%, #213553 100%);
}

.file-name {
  margin: 0 0 4px;
  font-weight: 600;
  word-break: break-word;
}

.file-meta {
  margin: 0 0 8px;
  font-size: 13px;
}

.file-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.file-actions .btn {
  text-decoration: none;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}

.nav-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  background: linear-gradient(135deg, #ffffff 0%, #f6fbff 100%);
  display: grid;
  gap: 8px;
}

body[data-theme="dark"] .nav-item {
  background: linear-gradient(135deg, #172539 0%, #1a2f49 100%);
}

.hidden {
  display: none;
}

/* ══════════════════════════════════════════════════
   CHOICE HIGHLIGHT (shared by quiz + duel)
══════════════════════════════════════════════════ */

.choice.choice-correct {
  border-color: var(--ok) !important;
  background: #e8fdf0 !important;
}
.choice.choice-wrong {
  border-color: var(--bad) !important;
  background: #fff3f0 !important;
}
body[data-theme="dark"] .choice.choice-correct {
  background: #0d2e1a !important;
  border-color: #4ee084 !important;
}
body[data-theme="dark"] .choice.choice-wrong {
  background: #2e0e0d !important;
  border-color: #ff7d7d !important;
}

/* ══════════════════════════════════════════════════
   DUEL MODE
══════════════════════════════════════════════════ */

/* Lobby tab toggle */
.lobby-tabs {
  display: flex;
  border-radius: 12px;
  overflow: hidden;
  border: 1.5px solid var(--border);
  margin-top: 16px;
}
.lobby-tab {
  flex: 1;
  padding: 11px 16px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: var(--card-bg);
  color: var(--text-muted);
  transition: background 0.18s, color 0.18s;
}
.lobby-tab:first-child {
  border-inline-end: 1.5px solid var(--border);
}
.lobby-tab.active {
  background: #4f6ef7;
  color: #fff;
}
.lobby-tab:not(.active):hover {
  background: var(--hover-bg, #f0f0f0);
  color: var(--text);
}
body[data-theme="dark"] .lobby-tab:not(.active):hover {
  background: #1e2a42;
}

.lobby-tab-panel {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  background: linear-gradient(135deg, #f8f4ff 0%, #eef7ff 100%);
  display: grid;
  gap: 8px;
}
/* Two-class selector wins over both .hidden and .lobby-tab-panel alone */
.lobby-tab-panel.hidden {
  display: none;
}
body[data-theme="dark"] .lobby-tab-panel {
  background: linear-gradient(135deg, #1a2040 0%, #152a3f 100%);
}

.duel-settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: end;
}
/* Force label + input to stack vertically inside each settings cell */
.duel-settings-row .field {
  display: flex;
  flex-direction: column;
  margin: 0;
}
.duel-settings-row .field label {
  margin-bottom: 6px;
}
.duel-setting-input {
  width: 100%;
  padding: 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--card-bg);
  color: var(--text);
  text-align: center;
}
.duel-setting-input:focus {
  outline: none;
  border-color: var(--accent);
}


/* Room code input */
.room-code-input {
  text-transform: uppercase !important;
  letter-spacing: 6px !important;
  font-size: 1.4rem !important;
  text-align: center !important;
  font-weight: 700 !important;
  width: 100% !important;
}

/* Room code display in waiting room */
.duel-room-code-display {
  text-align: center;
  padding: 20px 0;
}
.room-code-big {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: 12px;
  color: var(--primary);
  margin: 10px 0;
  font-family: monospace;
}

/* VS row (waiting room + countdown) */
.duel-vs-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}
.duel-player-card {
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  flex: 1;
  min-width: 0;
  background: linear-gradient(135deg, #ffffff 0%, #f4f9ff 100%);
}
@media (max-width: 480px) {
  .duel-vs-row        { gap: 8px; }
  .duel-player-card   { padding: 12px 10px; }
  .duel-player-name   { font-size: 0.9rem; }
  .duel-vs-label      { font-size: 1.4rem; flex-shrink: 0; }
}
body[data-theme="dark"] .duel-player-card {
  background: linear-gradient(135deg, #1a2b44 0%, #1e3050 100%);
}
.duel-player-name {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.duel-player-badge {
  font-size: 13px;
  padding: 4px 12px;
  border-radius: 20px;
  display: inline-block;
}
.badge-ready {
  background: #e6fdf0;
  color: #117a37;
  border: 1px solid #b7ebc9;
}
body[data-theme="dark"] .badge-ready {
  background: #1a3d2a;
  color: #4ee084;
  border-color: #2f7a4b;
}
.badge-waiting {
  background: #fff8e6;
  color: #8a6800;
  border: 1px solid #ffe999;
}
body[data-theme="dark"] .badge-waiting {
  background: #2d2400;
  color: #f5cc55;
  border-color: #6b5500;
}
.duel-vs-label {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent);
}

/* Countdown */
.duel-countdown-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 30px 0;
}
.duel-countdown-number {
  font-size: 7rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  animation: duel-pulse 1s ease-in-out infinite;
}
@keyframes duel-pulse {
  0%, 100% { transform: scale(1);    opacity: 1;   }
  50%       { transform: scale(1.15); opacity: 0.75; }
}

/* Live scoreboard */
.duel-live-scoreboard {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: linear-gradient(135deg, #f2f0ff 0%, #e8f3ff 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  margin-bottom: 16px;
}
body[data-theme="dark"] .duel-live-scoreboard {
  background: linear-gradient(135deg, #1e1a3a 0%, #162030 100%);
}
.duel-score-card {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: 10px;
  transition: background 0.3s;
  min-width: 0;
}
.duel-score-card.duel-score-me {
  background: linear-gradient(135deg, #eef3ff 0%, #e4eeff 100%);
  border: 1px solid #c8d8ff;
}
body[data-theme="dark"] .duel-score-card.duel-score-me {
  background: linear-gradient(135deg, #1a2640 0%, #1e2e50 100%);
  border-color: #2a4070;
}
.duel-score-card.duel-score-opp {
  background: linear-gradient(135deg, #fff2f0 0%, #ffe8e4 100%);
  border: 1px solid #ffc8c0;
}
body[data-theme="dark"] .duel-score-card.duel-score-opp {
  background: linear-gradient(135deg, #3a1a18 0%, #4a2020 100%);
  border-color: #7a3030;
}
.duel-score-name {
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.duel-score-num {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}
@media (max-width: 480px) {
  .duel-score-num  { font-size: 1.6rem; }
  .duel-score-name { font-size: 11px; }
  .duel-live-vs    { font-size: 1rem; }
}
.duel-score-prog {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}
.duel-live-vs {
  font-size: 1.4rem;
  font-weight: 900;
  flex-shrink: 0;
}

/* Progress bar */
.duel-progress-bar-wrap {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 12px;
}
.duel-progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* Winner banner */
.duel-winner-banner {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 900;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 16px;
  min-height: 30px;
}
.banner-win {
  background: linear-gradient(135deg, #e8fdf0 0%, #d4f9e2 100%);
  color: #117a37;
  border: 2px solid #4ee084;
  animation: duel-appear 0.5s ease-out;
}
body[data-theme="dark"] .banner-win {
  background: linear-gradient(135deg, #0d2e1a 0%, #153325 100%);
  color: #4ee084;
}
.banner-lose {
  background: linear-gradient(135deg, #fff3f0 0%, #fde8e4 100%);
  color: #b42318;
  border: 2px solid #ff7d7d;
  animation: duel-appear 0.5s ease-out;
}
body[data-theme="dark"] .banner-lose {
  background: linear-gradient(135deg, #2e0e0d 0%, #3a1515 100%);
  color: #ff7d7d;
}
.banner-tie {
  background: linear-gradient(135deg, #fff8e6 0%, #fdf0ca 100%);
  color: #8a6800;
  border: 2px solid #f5cc55;
  animation: duel-appear 0.5s ease-out;
}
body[data-theme="dark"] .banner-tie {
  background: linear-gradient(135deg, #2d2400 0%, #3a2f00 100%);
  color: #f5cc55;
}
@keyframes duel-appear {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

/* Final score cards */
.duel-final-scores {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 20px 0;
}
.duel-final-card {
  text-align: center;
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 20px 24px;
  flex: 1;
  min-width: 0;
  background: linear-gradient(135deg, #ffffff 0%, #f4f9ff 100%);
  transition: border-color 0.3s, box-shadow 0.3s;
}
@media (max-width: 480px) {
  .duel-final-scores  { gap: 8px; }
  .duel-final-card    { padding: 14px 10px; }
  .duel-final-num     { font-size: 2rem; }
  .duel-final-name    { font-size: 0.85rem; }
  .duel-final-vs      { font-size: 1.4rem; flex-shrink: 0; }
}
body[data-theme="dark"] .duel-final-card {
  background: linear-gradient(135deg, #1a2b44 0%, #1e3050 100%);
}
.duel-winner-card {
  border-color: #f5cc55 !important;
  box-shadow: 0 0 22px rgba(245, 204, 85, 0.45);
}
.duel-final-name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 8px;
}
.duel-final-num {
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}
.duel-final-label {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}
.duel-final-vs {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
}

/* ── SVG Circular Timer ─────────────────────────────────────────── */
.duel-timer-wrap {
  position: relative;
  width: 88px;
  height: 88px;
  margin: 0 auto 10px;
}
.duel-timer-svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}
.duel-timer-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 8;
}
.duel-timer-arc {
  fill: none;
  stroke: #22c55e;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.1s linear, stroke 0.3s;
}
.duel-timer-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text);
}

/* ── Opponent answered badge ───────────────────────────────────── */
.duel-opp-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  background: #e6fdf0;
  color: #117a37;
  border: 1px solid #b7ebc9;
  font-size: 13px;
  font-weight: 600;
  margin: 0 auto 10px;
  text-align: center;
}
body[data-theme="dark"] .duel-opp-badge {
  background: #1a3d2a;
  color: #4ee084;
  border-color: #2f7a4b;
}

/* ── Round-score summary (inside feedback) ─────────────────────── */
.duel-round-scores {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.round-score-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 0;
}
.round-score-name { font-weight: 600; }
.round-score-pts  { font-weight: 700; font-size: 1.05rem; }
.round-winner     { color: var(--ok, #22c55e); }
.round-score-total {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid var(--border);
  padding-top: 6px;
}

/* ── Feedback screen (between questions) ───────────────────────── */
.fb-verdict {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 10px;
  padding: 10px 14px;
  border-radius: 8px;
}
.fb-correct {
  background: #dcfce7;
  color: #166534;
}
.fb-wrong {
  background: #fee2e2;
  color: #991b1b;
}
body[data-theme="dark"] .fb-correct { background: #14532d; color: #4ade80; }
body[data-theme="dark"] .fb-wrong   { background: #450a0a; color: #fca5a5; }

.explanation-block {
  margin: 10px 0;
  padding: 10px 14px;
  background: var(--bg-alt, var(--surface));
  border-radius: 8px;
  border-right: 3px solid var(--primary);
  font-size: 0.95rem;
  line-height: 1.6;
}
.explanation-block p { margin: 0; }

/* ── Feedback section header (dynamic question number) ─────────── */
#duel-feedback-section h2 { font-size: 1.1rem; color: var(--muted); margin-bottom: 14px; }

/* ── Round-score total line bold tweak ─────────────────────────── */
.round-score-total strong { color: var(--primary); }

/* ── duel-final-vs spacing ─────────────────────────────────────── */

/* ── Round points earned badge ─────────────────────────────────── */
.round-pts-earned {
  display: inline-block;
  background: #dcfce7;
  color: #166534;
  border-radius: 12px;
  padding: 1px 10px;
  font-size: 13px;
  font-weight: 700;
  margin-right: 6px;
}
body[data-theme="dark"] .round-pts-earned {
  background: #14532d;
  color: #4ade80;
}

/* ══════════════════════════════════════════════════
   HERO STATS (index.html)
══════════════════════════════════════════════════ */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 24px;
  padding: 14px 20px;
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  border: none;
  border-radius: 14px;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  color: #fff;
}
.stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1;
}
.stat-lbl {
  font-size: 0.75rem;
  opacity: 0.85;
  letter-spacing: 0.04em;
}
.stat-divider {
  color: rgba(255,255,255,0.4);
  font-size: 1.5rem;
  font-weight: 300;
}
.stat-badge {
  background: rgba(255,255,255,0.18);
  border: 1.5px solid rgba(255,255,255,0.5);
  color: #fff;
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  backdrop-filter: blur(4px);
}

/* ══════════════════════════════════════════════════
   BREADCRUMB NAVIGATION
══════════════════════════════════════════════════ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { color: var(--muted); }
.breadcrumb .bc-sep { opacity: 0.5; font-size: 0.9rem; }

/* ══════════════════════════════════════════════════
   TOAST NOTIFICATIONS
══════════════════════════════════════════════════ */
#toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}
.toast {
  min-width: 200px;
  max-width: 380px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(0,0,0,0.18);
  pointer-events: auto;
  animation: toast-in 0.25s ease forwards;
  text-align: center;
}
.toast.toast-ok   { background: #dcfce7; color: #166534; border: 1px solid #86efac; }
.toast.toast-bad  { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.toast.toast-info { background: #eff6ff; color: #1e40af; border: 1px solid #93c5fd; }
body[data-theme="dark"] .toast.toast-ok   { background: #14532d; color: #86efac; border-color: #166534; }
body[data-theme="dark"] .toast.toast-bad  { background: #450a0a; color: #fca5a5; border-color: #991b1b; }
body[data-theme="dark"] .toast.toast-info { background: #1e3a5f; color: #93c5fd; border-color: #1e40af; }
.toast.toast-out { animation: toast-out 0.3s ease forwards; }
@keyframes toast-in  { from { opacity:0; transform: translateY(12px); } to { opacity:1; transform: translateY(0); } }
@keyframes toast-out { from { opacity:1; transform: translateY(0);    } to { opacity:0; transform: translateY(12px); } }

/* ══════════════════════════════════════════════════
   NAV-ITEM HOVER (card lift effect)
══════════════════════════════════════════════════ */
.nav-item {
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  cursor: default;
}
.nav-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.13);
}
body[data-theme="dark"] .nav-item:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
}

/* ══════════════════════════════════════════════════
   WHATSAPP SHARE BUTTON
══════════════════════════════════════════════════ */
.btn-whatsapp {
  background: #25d366;
  color: #fff !important;
  border-color: #25d366;
  font-weight: 700;
}
.btn-whatsapp:hover { background: #1fb855; border-color: #1fb855; }

/* ══════════════════════════════════════════════════
   SKELETON LOADER (duel join loading)
══════════════════════════════════════════════════ */
.skeleton {
  background: linear-gradient(90deg, var(--border) 25%, var(--surface) 50%, var(--border) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.2s infinite;
  border-radius: 6px;
}
@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.skeleton-line { height: 14px; margin: 6px 0; }
.skeleton-line.wide  { width: 80%; }
.skeleton-line.short { width: 45%; }

/* ══════════════════════════════════════════════════
   MOBILE: duel panels single column below 640px
   (already set, adding extra touch targets)
══════════════════════════════════════════════════ */
@media (max-width: 640px) {
  .duel-settings-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 8px 16px; }
  .stat-num   { font-size: 1.35rem; }
}

/* ════════════════════════════════════════════════════════════════
   MULTIPLAYER MODE — player list, leaderboard, ranking table
   ════════════════════════════════════════════════════════════════ */

/* Waiting room — connected players list */
.mp-player-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0 4px;
}
.mp-player-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg, var(--surface));
  transition: border-color 0.2s;
}
.mp-player-item.mp-player-me {
  border-color: var(--primary);
  background: linear-gradient(135deg, #eef3ff 0%, #e4eeff 100%);
}
body[data-theme="dark"] .mp-player-item.mp-player-me {
  background: linear-gradient(135deg, #1a2640 0%, #1e2e50 100%);
}
.mp-player-item-name {
  font-weight: 600;
  font-size: 0.95rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mp-me-tag {
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--muted);
}

/* Live leaderboard during quiz */
.mp-live-leaderboard {
  display: flex;
  flex-direction: column;
  gap: 3px;
  background: linear-gradient(135deg, #f2f0ff 0%, #e8f3ff 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px 10px;
  margin-bottom: 14px;
}
body[data-theme="dark"] .mp-live-leaderboard {
  background: linear-gradient(135deg, #1e1a3a 0%, #162030 100%);
}
.mp-lb-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 8px;
  font-size: 0.88rem;
  transition: background 0.2s;
}
.mp-lb-row.mp-lb-me {
  background: rgba(99, 102, 241, 0.12);
  font-weight: 700;
}
body[data-theme="dark"] .mp-lb-row.mp-lb-me {
  background: rgba(99, 102, 241, 0.2);
}
.mp-lb-row.mp-lb-disconnected {
  opacity: 0.45;
  text-decoration: line-through;
}
.mp-lb-rank {
  width: 18px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  flex-shrink: 0;
}
.mp-lb-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mp-lb-score {
  font-weight: 700;
  color: var(--primary);
  min-width: 34px;
  text-align: end;
  font-size: 0.9rem;
}

/* Final ranking table */
.mp-final-ranking {
  margin: 16px 0;
}
.mp-ranking-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mp-rank-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #ffffff 0%, #f4f9ff 100%);
  transition: box-shadow 0.2s;
}
body[data-theme="dark"] .mp-rank-row {
  background: linear-gradient(135deg, #1a2b44 0%, #1e3050 100%);
}
.mp-rank-row.mp-rank-me {
  border-color: var(--primary);
  box-shadow: 0 0 14px rgba(99, 102, 241, 0.22);
}
.mp-rank-row.mp-rank-first {
  border-color: #f5cc55;
  box-shadow: 0 0 20px rgba(245, 204, 85, 0.35);
}
.mp-rank-medal {
  font-size: 1.4rem;
  flex-shrink: 0;
  width: 30px;
  text-align: center;
}
.mp-rank-name {
  flex: 1;
  font-weight: 600;
  font-size: 1rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.mp-rank-score {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--primary);
  min-width: 44px;
  text-align: end;
}
.mp-rank-pct {
  font-size: 12px;
  color: var(--muted);
  min-width: 38px;
  text-align: end;
}
@media (max-width: 480px) {
  .mp-rank-pct    { display: none; }
  .mp-rank-score  { font-size: 1rem; }
  .mp-rank-medal  { font-size: 1.1rem; }
}

/* ═══════════════════════════════════════════════════════
   AUTH — Login / Register page
   ═══════════════════════════════════════════════════════ */

.auth-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
}

.auth-tab {
  flex: 1;
  padding: 10px 0;
  border: 1px solid var(--border);
  border-radius: 9px 9px 0 0;
  background: linear-gradient(135deg, #f2f7ff 0%, #eef0ff 100%);
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.auth-tab.active {
  background: linear-gradient(135deg, var(--primary) 0%, #7a5cff 100%);
  color: #fff;
  border-color: transparent;
}

body[data-theme="dark"] .auth-tab {
  background: linear-gradient(135deg, #1a2540 0%, #1e1e3f 100%);
  color: var(--muted);
}

body[data-theme="dark"] .auth-tab.active {
  background: linear-gradient(135deg, var(--primary) 0%, #7a5cff 100%);
  color: #fff;
}

.auth-form {
  max-width: 420px;
}

.auth-form h2 {
  margin-bottom: 16px;
}

.password-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
}

.password-wrap input[type="password"],
.password-wrap input[type="text"] {
  flex: 1;
  width: auto;
}

.btn-show-pw {
  padding: 8px 10px;
  font-size: 16px;
  flex-shrink: 0;
}

.auth-error {
  color: var(--bad);
  font-weight: 600;
  margin: 8px 0;
  padding: 8px 12px;
  border: 1px solid var(--bad);
  border-radius: 8px;
  background: #fff3f3;
}

body[data-theme="dark"] .auth-error {
  background: #3a1f1f;
}

/* Inline validation error below the setup panel (lecture/timer) */
.setup-error {
  color: var(--bad);
  font-size: 0.92rem;
  font-weight: 600;
  margin: 6px 0 2px;
  padding: 7px 12px;
  border: 1px solid var(--bad);
  border-radius: 8px;
  background: #fff3f3;
}

body[data-theme="dark"] .setup-error {
  background: #3a1f1f;
}

.auth-ok {
  color: var(--ok);
  font-weight: 600;
  margin: 8px 0;
  padding: 8px 12px;
  border: 1px solid var(--ok);
  border-radius: 8px;
  background: #f1fcf4;
}

body[data-theme="dark"] .auth-ok {
  background: #162f21;
}

.auth-switch-hint {
  margin-top: 14px;
  font-size: 14px;
}

.link-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: inherit;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

/* ── Auth status bar (shown on protected pages) ── */

.auth-status-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 10px 0 4px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: linear-gradient(135deg, #f3fbff 0%, #f7f3ff 100%);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

body[data-theme="dark"] .auth-status-bar {
  background: linear-gradient(135deg, #1a2f3f 0%, #2a2242 100%);
}

.btn-logout {
  margin-right: auto;
  padding: 6px 12px;
  font-size: 13px;
  border-color: #f3c6c6;
  background: linear-gradient(135deg, #fff3f3 0%, #ffe9e9 100%);
  color: var(--bad);
}

.btn-logout:hover {
  background: linear-gradient(135deg, #ffe0e0 0%, #ffd4d4 100%);
}

body[data-theme="dark"] .btn-logout {
  border-color: #844848;
  background: linear-gradient(135deg, #3a1f1f 0%, #4a2525 100%);
  color: #ff9a9a;
}

/* ── Question filter row (weak-first setup) ── */

.question-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.question-filter-option {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 14px;
  cursor: pointer;
  background: linear-gradient(135deg, #ffffff 0%, #f7fbff 100%);
  font-size: 15px;
  transition: border-color 0.15s, background 0.15s;
}

.question-filter-option:has(input:checked) {
  border-color: var(--primary);
  background: linear-gradient(135deg, #f0ecff 0%, #e8f0ff 100%);
}

body[data-theme="dark"] .question-filter-option {
  background: linear-gradient(135deg, #172337 0%, #1a2a3f 100%);
}

body[data-theme="dark"] .question-filter-option:has(input:checked) {
  border-color: var(--primary);
  background: linear-gradient(135deg, #221b3f 0%, #1e2a48 100%);
}

.filter-hint {
  font-size: 12px;
  color: var(--muted);
}

/* ── Locked nav cards ── */

.nav-item-locked {
  border-color: #c9b8ff;
  background: linear-gradient(135deg, #faf7ff 0%, #f3eeff 100%);
}

body[data-theme="dark"] .nav-item-locked {
  border-color: #4a3880;
  background: linear-gradient(135deg, #1e1630 0%, #1a1e3a 100%);
}

/* ═══════════════════════════════════════════════════════
   PROGRESS BAR (weak-first + confidence)
   ═══════════════════════════════════════════════════════ */

.progress-bar-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 4px 0 14px;
}

.progress-bar-track {
  flex: 1;
  min-width: 80px;
  height: 10px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 99px;
  background: var(--muted);
  transition: width 0.45s ease, background-color 0.45s ease;
}

.progress-bar-fill.good   { background: var(--ok); }
.progress-bar-fill.medium { background: var(--accent); }
.progress-bar-fill.bad    { background: var(--bad); }

.progress-bar-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════
   CONFIDENCE CHANGE PANEL (after answering)
   ═══════════════════════════════════════════════════════ */

.confidence-change-section {
  margin-top: 14px;
  border: 1px solid #c9b8ff;
  border-radius: 10px;
  padding: 12px 14px;
  background: linear-gradient(135deg, #f7f3ff 0%, #f0ecff 100%);
}

body[data-theme="dark"] .confidence-change-section {
  border-color: #4a3880;
  background: linear-gradient(135deg, #221b3f 0%, #1a1e3a 100%);
}

.confidence-change-section .label {
  font-size: 14px;
  margin-bottom: 10px;
  color: var(--muted);
}

#confidence-change-confirm {
  margin-top: 10px;
  border-color: #c9b8ff;
  background: linear-gradient(135deg, #f3eeff 0%, #eae0ff 100%);
  color: var(--primary);
}

#confidence-change-confirm:hover {
  background: linear-gradient(135deg, #ebe2ff 0%, #ddd4ff 100%);
}

body[data-theme="dark"] #confidence-change-confirm {
  border-color: #4a3880;
  background: linear-gradient(135deg, #1e1630 0%, #1a1e3a 100%);
  color: #a990ff;
}

/* ── Setup-page lifetime progress bar (inside header card) ── */

.setup-progress-bar-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 8px 0 4px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: linear-gradient(135deg, #f3fbff 0%, #f7f3ff 100%);
}

body[data-theme="dark"] .setup-progress-bar-wrap {
  background: linear-gradient(135deg, #1a2f3f 0%, #2a2242 100%);
}

.setup-progress-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

.setup-progress-bar-wrap .progress-bar-track {
  flex: 1;
  min-width: 60px;
}

/* ── Setup per-level breakdown bars ── */

.setup-level-bars {
  width: 100%;
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setup-level-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 2px;
}

.setup-level-header-btns {
  display: flex;
  gap: 6px;
  align-items: center;
}

.setup-level-collapse {
  font-size: 11px;
  padding: 3px 10px;
  border-color: #d0d8ee;
  background: #f5f7ff;
  color: var(--muted);
  font-weight: 500;
}

body[data-theme="dark"] .setup-level-collapse {
  border-color: #252e50;
  background: #141a2e;
  color: #7080aa;
}

.setup-level-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}

.setup-level-toggle {
  font-size: 11px;
  padding: 3px 10px;
  border-color: #c5d5f5;
  background: #f0f5ff;
  color: var(--primary);
  font-weight: 600;
}

body[data-theme="dark"] .setup-level-toggle {
  border-color: #2e3f70;
  background: #1a2540;
  color: #9abaff;
}

.setup-level-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.setup-level-label {
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  min-width: 120px;
  text-align: right;
}

.setup-level-text {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  min-width: 110px;
}

.setup-level-row .progress-bar-track {
  flex: 1;
  min-width: 60px;
  height: 10px;
}

/* ═══════════════════════════════════════════════════════
   TIMER MODE — time inputs row (minutes : seconds)
   ═══════════════════════════════════════════════════════ */

.time-inputs-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.time-input-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.time-input-unit {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.time-input {
  width: 80px;
}

.time-colon {
  font-size: 22px;
  font-weight: 700;
  color: var(--muted);
  padding-bottom: 4px;
  line-height: 1;
  align-self: flex-end;
}

/* ═══════════════════════════════════════════════════════
   HOME PAGE — large two-card layout
   ═══════════════════════════════════════════════════════ */

.nav-grid-home {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.nav-item-home {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 28px 28px;
  gap: 10px;
}

.nav-item-home h3 {
  font-size: 20px;
  margin: 0;
}

.nav-item-home .muted {
  flex: 1;
  font-size: 15px;
  line-height: 1.55;
}

.nav-item-home .btn {
  margin-top: 8px;
  padding: 12px 28px;
  font-size: 16px;
}

.home-card-icon {
  font-size: 48px;
  line-height: 1;
  margin-bottom: 4px;
}

/* ══════════════════════════════════════════════════
   KEYBOARD HINT
══════════════════════════════════════════════════ */

.keyboard-hint {
  font-size: 12px;
  color: var(--muted);
  margin: 6px 0 0;
  opacity: 0.72;
  user-select: none;
}

/* ══════════════════════════════════════════════════
   STREAK COUNTER  (re-uses .meta base style)
══════════════════════════════════════════════════ */

#streak-status {
  color: var(--accent) !important;
  font-size: 15px !important;
  animation: streak-pop 0.35s ease;
}

@keyframes streak-pop {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.22); }
}

/* ══════════════════════════════════════════════════
   WRONG ANSWERS DETAILS (result section)
══════════════════════════════════════════════════ */

.wrong-answers-details {
  margin: 14px 0 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.wrong-answers-details > summary {
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
  background: linear-gradient(135deg, #fff3f3 0%, #ffe9e9 100%);
  color: var(--bad);
  list-style: none;
  user-select: none;
}

.wrong-answers-details > summary::-webkit-details-marker { display: none; }

body[data-theme="dark"] .wrong-answers-details > summary {
  background: linear-gradient(135deg, #3a1f1f 0%, #4a2525 100%);
}

.wrong-answers-details[open] > summary {
  border-bottom: 1px solid var(--border);
}

.wrong-answer-item {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.65;
}

.wrong-answer-item:last-child { border-bottom: none; }

.wa-user    { color: var(--bad);   display: block; }
.wa-correct { color: var(--ok);    display: block; }
.wa-explain { color: var(--muted); display: block; font-size: 13px; }

/* ══════════════════════════════════════════════════
   CONFIDENCE RESULT CHART
══════════════════════════════════════════════════ */

.conf-chart {
  margin: 14px 0 0;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(135deg, #f7f3ff 0%, #f0ecff 100%);
}

body[data-theme="dark"] .conf-chart {
  background: linear-gradient(135deg, #221b3f 0%, #1a1e3a 100%);
}

.conf-chart-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0;
}

.conf-chart-label {
  width: 90px;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  text-align: end;
}

.conf-chart-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  min-width: 80px;
}

/* ══════════════════════════════════════════════════
   RESET STATS BUTTON
══════════════════════════════════════════════════ */

#reset-stats-btn {
  border-color: #f3c6c6;
  background: linear-gradient(135deg, #fff3f3 0%, #ffe9e9 100%);
  color: var(--bad);
  font-size: 13px;
  padding: 8px 12px;
}

body[data-theme="dark"] #reset-stats-btn {
  border-color: #844848;
  background: linear-gradient(135deg, #3a1f1f 0%, #4a2525 100%);
  color: #ff9a9a;
}

/* ══════════════════════════════════════════════════
   LECTURE STATS (index.html)
══════════════════════════════════════════════════ */

.lecture-stat-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0;
  font-size: 14px;
}

.lecture-stat-name {
  width: 170px;
  flex-shrink: 0;
  font-weight: 500;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lecture-stat-text {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  min-width: 96px;
}

@media (max-width: 480px) {
  .lecture-stat-name { width: 110px; }
  .keyboard-hint { display: none; }
}

/* ══════════════════════════════════════════════════
   MULTI-BAR PROGRESS SECTION (weak-first + confidence)
══════════════════════════════════════════════════ */

.progress-bars-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 4px 0 14px;
}

.progress-bar-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.progress-bar-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  min-width: 118px;
  text-align: end;
}

.progress-bar-fill.session {
  background: var(--primary);
}

.progress-bar-label.conf-level-label.high   { color: #117a37; }
.progress-bar-label.conf-level-label.medium { color: #8a6800; }
.progress-bar-label.conf-level-label.low    { color: var(--bad); }

body[data-theme="dark"] .progress-bar-label.conf-level-label.high   { color: #4ee084; }
body[data-theme="dark"] .progress-bar-label.conf-level-label.medium { color: #f5cc55; }
body[data-theme="dark"] .progress-bar-label.conf-level-label.low    { color: #ff7d7d; }

@media (max-width: 480px) {
  .progress-bar-label { min-width: 80px; font-size: 11px; }
}

/* ══════════════════════════════════════════════════
   TOGGLE-ALL LECTURES BUTTON
══════════════════════════════════════════════════ */

.toggle-all-btn {
  display: inline-block;
  font-size: 13px;
  padding: 6px 14px;
  margin-bottom: 10px;
  border-color: #c5d5f5;
  background: linear-gradient(135deg, #f0f5ff 0%, #eae8ff 100%);
  color: var(--primary);
  font-weight: 600;
}

.toggle-all-btn:hover {
  background: linear-gradient(135deg, #e4ecff 0%, #dcdaff 100%);
}

body[data-theme="dark"] .toggle-all-btn {
  border-color: #2e3f70;
  background: linear-gradient(135deg, #1a2540 0%, #1e2555 100%);
  color: #9abaff;
}

body[data-theme="dark"] .toggle-all-btn:hover {
  background: linear-gradient(135deg, #1e2d52 0%, #242a64 100%);
}

/* ══════════════════════════════════════════════════════════════════
   TOGGLE-UNANSWERED BUTTON (progress bar)
══════════════════════════════════════════════════════════════════ */

.toggle-unanswered-btn {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  margin-bottom: 8px;
  border-color: #dde5f5;
  background: #f7f9ff;
  color: #5566aa;
  font-weight: 500;
  opacity: 0.85;
}

.toggle-unanswered-btn:hover {
  opacity: 1;
  background: #eef2ff;
}

body[data-theme="dark"] .toggle-unanswered-btn {
  border-color: #2a3660;
  background: #161f38;
  color: #7a96dd;
}

body[data-theme="dark"] .toggle-unanswered-btn:hover {
  background: #1c2845;
}