* {
  box-sizing: border-box;
}

:root {
  --bg: #07101b;
  --bg-2: #0b1422;
  --bg-3: #0f1b2d;
  --panel: rgba(15, 23, 38, 0.92);
  --panel-2: rgba(20, 31, 50, 0.96);
  --panel-3: rgba(27, 40, 63, 0.92);
  --line: rgba(255, 255, 255, 0.08);
  --line-soft: rgba(255, 255, 255, 0.05);
  --text: #e8eefc;
  --muted: #a8b3cf;
  --muted-2: #8290ae;
  --accent: #4ea1ff;
  --accent-2: #7cc4ff;
  --accent-3: #b6e2ff;
  --green: #32d27a;
  --green-2: #1ea85f;
  --red: #ff6b6b;
  --red-2: #e34646;
  --bronze: #d8a35d;
  --silver: #d9e2f2;
  --gold: #ffd95e;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
  --shadow-strong: 0 18px 42px rgba(0, 0, 0, 0.42);
  --shadow-blue: 0 10px 30px rgba(78, 161, 255, 0.18);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --radius-xs: 10px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at 18% 0%, rgba(78, 161, 255, 0.08), transparent 28%),
    radial-gradient(circle at 85% 100%, rgba(124, 196, 255, 0.06), transparent 26%),
    linear-gradient(180deg, #060c16 0%, #09111d 50%, #0c1624 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overscroll-behavior-y: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease, opacity 0.18s ease;
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

body.wallpaper-gradient-1 {
  background:
    linear-gradient(135deg, rgba(185,124,255,0.18), rgba(73,215,255,0.12)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-gradient-2 {
  background:
    linear-gradient(135deg, rgba(255,224,130,0.18), rgba(255,183,77,0.12)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-gradient-3 {
  background:
    linear-gradient(135deg, rgba(201,214,255,0.16), rgba(212,252,121,0.10)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-gradient-4 {
  background:
    linear-gradient(135deg, rgba(168,255,120,0.14), rgba(120,255,214,0.12)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-gradient-5 {
  background:
    linear-gradient(135deg, rgba(127,127,213,0.16), rgba(252,165,241,0.12)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-gradient-6 {
  background:
    linear-gradient(135deg, rgba(255,154,158,0.18), rgba(251,194,235,0.12)),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-dark-1 {
  background: linear-gradient(180deg, #040608 0%, #0a0d12 100%);
}

body.wallpaper-dark-2 {
  background: linear-gradient(135deg, #12002f 0%, #060612 45%, #001f3f 100%);
}

body.wallpaper-dark-3 {
  background:
    radial-gradient(circle at 70% 30%, rgba(46, 125, 255, 0.16), transparent 18%),
    radial-gradient(circle at 30% 70%, rgba(171, 71, 188, 0.16), transparent 18%),
    linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

body.wallpaper-space-1 {
  background:
    radial-gradient(circle at 70% 30%, rgba(101, 196, 255, 0.20), transparent 18%),
    radial-gradient(circle at 35% 60%, rgba(173, 82, 255, 0.16), transparent 16%),
    linear-gradient(180deg, #050912 0%, #081220 55%, #0a1630 100%);
}

body.wallpaper-space-2 {
  background: linear-gradient(180deg, #03060c 0%, #0b1220 100%);
}

body.wallpaper-nature-1 {
  background: linear-gradient(180deg, #0f2027 0%, #203a43 55%, #2c5364 100%);
}

body.wallpaper-nature-2 {
  background: linear-gradient(180deg, #3e2723 0%, #5d4037 55%, #8d6e63 100%);
}

body.accent-purple {
  --accent: #9b5cff;
  --accent-2: #c79bff;
  --accent-3: #e1cbff;
}

body.accent-pink {
  --accent: #ff5ca8;
  --accent-2: #ff9bc8;
  --accent-3: #ffd0e5;
}

body.accent-gold {
  --accent: #ffd54a;
  --accent-2: #ffe588;
  --accent-3: #fff1b5;
}

body.accent-green {
  --accent: #42c883;
  --accent-2: #8de0b2;
  --accent-3: #c7f3db;
}

body.accent-orange {
  --accent: #ff9b42;
  --accent-2: #ffc285;
  --accent-3: #ffe0bc;
}

/* image wallpapers stay readable */
body[class*="wallpaper-pattern-"] .quiz-header,
body[class*="wallpaper-pattern-"] .topic-card,
body[class*="wallpaper-pattern-"] .info-card,
body[class*="wallpaper-pattern-"] .resume-card,
body[class*="wallpaper-pattern-"] .quiz-progress-section,
body[class*="wallpaper-pattern-"] .question-card,
body[class*="wallpaper-pattern-"] .question-tools,
body[class*="wallpaper-pattern-"] .result-card,
body[class*="wallpaper-pattern-"] .history-card,
body[class*="wallpaper-pattern-"] .post-result-actions,
body[class*="wallpaper-pattern-"] .quiz-status-card,
body[class*="wallpaper-pattern-"] .quiz-main-card,
body[class*="wallpaper-pattern-"] .quiz-controls-card,
body[class*="wallpaper-pattern-"] .quiz-nav-card,
body[class*="wallpaper-pattern-"] .music-panel {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* HEADER */
.quiz-header {
  padding: 24px 0 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(9, 16, 29, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: relative;
  top: auto;
  z-index: 1;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(78, 161, 255, 0.08);
  border: 1px solid rgba(124, 196, 255, 0.16);
}

.back-link:hover {
  color: var(--accent-3);
  transform: translateY(-1px);
}

.quiz-header h1 {
  margin: 0 0 8px;
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.4px;
}

.quiz-header p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

/* MAIN */
.quiz-main {
  padding: 28px 0 40px;
  animation: fadeIn 0.3s ease;
}

/* SHARED PREMIUM CARD STYLE */
.info-card,
.resume-card,
.quiz-progress-section,
.question-card,
.question-tools,
.result-card,
.history-card,
.post-result-actions,
.topic-card,
.empty-state,
.skeleton-card {
  background: linear-gradient(180deg, rgba(16, 24, 39, 0.96), rgba(10, 18, 32, 0.95));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* TOPICS GRID / INDEX PAGE */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 8px;
}

.topic-card {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease,
    background 0.22s ease;
}

.topic-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top right, rgba(124, 196, 255, 0.12), transparent 34%),
    linear-gradient(180deg, rgba(255,255,255,0.02), transparent 50%);
  pointer-events: none;
}

.topic-card:hover {
  transform: translateY(-5px);
  border-color: rgba(124, 196, 255, 0.22);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.4), var(--shadow-blue);
}

.topic-card > * {
  position: relative;
  z-index: 1;
}

.topic-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.topic-icon,
.topic-thumb {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(78, 161, 255, 0.2), rgba(124, 196, 255, 0.08));
  border: 1px solid rgba(124, 196, 255, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-2);
  font-size: 22px;
  flex-shrink: 0;
  overflow: hidden;
}

.topic-meta,
.topic-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.topic-title {
  margin: 0;
  font-size: 21px;
  line-height: 1.2;
  letter-spacing: -0.3px;
}

.topic-subtitle,
.topic-desc {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.topic-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 0;
}

.stat-pill,
.topic-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.enter-topic-btn,
.topic-card .action-btn {
  margin-top: 18px;
}

.topic-card.is-locked {
  opacity: 0.7;
}

.topic-card.is-locked::after {
  content: "Locked";
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 107, 107, 0.1);
  color: #ffb4b4;
  border: 1px solid rgba(255, 107, 107, 0.18);
  font-size: 12px;
  font-weight: 700;
}

/* HOME PAGE HELPERS */
.quiz-home-hero {
  margin-bottom: 20px;
  min-height: auto;
}

.quiz-home-hero-top {
  align-items: center;
}

.quiz-home-title {
  font-size: 34px;
  margin-top: 10px;
}

.quiz-home-desc {
  max-width: 760px;
}

.quiz-home-icon {
  flex-shrink: 0;
}

.quiz-home-stats {
  margin-top: 18px;
}

.quiz-home-section-head {
  margin-bottom: 16px;
}

.quiz-home-section-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.quiz-home-section-title {
  margin: 0 0 6px;
  font-size: 26px;
}

.quiz-home-section-subtitle {
  margin: 0;
  color: var(--muted);
}

/* EMPTY / LOADING STATES */
.empty-state {
  text-align: center;
  padding: 30px 18px;
  color: var(--muted);
}

.empty-state h3 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 20px;
}

.empty-state p {
  margin: 0;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.skeleton-card {
  min-height: 220px;
  position: relative;
  overflow: hidden;
}

.skeleton-card::after,
.skeleton-line::after,
.skeleton-box::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.05) 45%,
    rgba(255,255,255,0.09) 50%,
    rgba(255,255,255,0.05) 55%,
    transparent 100%
  );
  animation: skeleton-shimmer 1.4s infinite;
}

.skeleton-avatar {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: rgba(255,255,255,0.06);
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
}

.skeleton-line {
  height: 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

.skeleton-line.lg {
  height: 20px;
  width: 68%;
}

.skeleton-line.md {
  width: 86%;
}

.skeleton-line.sm {
  width: 48%;
}

.skeleton-box {
  height: 42px;
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  margin-top: 18px;
  position: relative;
  overflow: hidden;
}

@keyframes skeleton-shimmer {
  100% {
    transform: translateX(100%);
  }
}

/* TOP CARDS */
.quiz-top-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 20px;
}

.info-card h3,
.resume-card h3,
.result-card h3,
.history-card h3 {
  margin: 0 0 12px;
  font-size: 20px;
  letter-spacing: -0.2px;
}

#attemptInfo,
#performanceSummary,
#resultSummary,
#historySummary {
  line-height: 1.8;
  color: var(--muted);
}

#attemptInfo > div,
#performanceSummary > div,
#resultSummary > div,
#historySummary > div {
  margin-bottom: 6px;
}

/* RESUME */
.resume-card {
  margin-bottom: 20px;
  border-color: rgba(124, 196, 255, 0.16);
  background:
    radial-gradient(circle at top right, rgba(124, 196, 255, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(16,24,39,0.98), rgba(10,18,32,0.98));
}

#resumeSummary {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.6;
}

.resume-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* BUTTONS */
.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.07);
  background: linear-gradient(180deg, #17253d, #0f182a);
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    opacity 0.18s ease,
    background 0.18s ease,
    color 0.18s ease,
    box-shadow 0.18s ease;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
}

.action-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(124, 196, 255, 0.25);
  color: var(--accent-2);
  box-shadow: 0 10px 22px rgba(0,0,0,0.24), 0 0 0 1px rgba(124,196,255,0.04);
}

.action-btn:active {
  transform: translateY(0);
}

.action-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #07111d;
  border-color: transparent;
  box-shadow: 0 8px 22px rgba(78, 161, 255, 0.28);
}

.primary-btn:hover {
  color: #07111d;
  border-color: transparent;
  filter: brightness(1.03);
  box-shadow: 0 12px 26px rgba(78, 161, 255, 0.36);
}

.success-btn {
  background: linear-gradient(135deg, var(--green), #56e39a);
  color: #03140b;
  border-color: transparent;
}

.danger-btn {
  background: linear-gradient(135deg, var(--red), #ff8a8a);
  color: #180505;
  border-color: transparent;
}

/* PROGRESS */
.quiz-progress-section {
  margin-bottom: 20px;
}

.progress-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.progress-head span {
  color: var(--muted);
  font-size: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
}

.progress-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #0b1422;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 14px rgba(78, 161, 255, 0.32);
  transition: width 0.35s ease;
}

.progress-text {
  min-width: 56px;
  text-align: right;
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 700;
}

.timer-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.timer-box {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.timer-box:hover {
  border-color: rgba(124, 196, 255, 0.14);
  transform: translateY(-1px);
}

.timer-box span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.timer-box strong {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-2);
}

/* QUESTION CARD */
.question-card {
  margin-bottom: 20px;
}

.question-image-wrap {
  position: relative;
  width: 100%;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 12px;
  min-height: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.question-image-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top, rgba(78, 161, 255, 0.06), transparent 36%);
  pointer-events: none;
}

#questionImage {
  width: 100%;
  max-width: 900px;
  height: auto;
  max-height: 520px;
  object-fit: contain;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
}

#zoomBtn {
  margin-top: 14px;
  align-self: flex-end;
  position: relative;
  z-index: 1;
}

/* ANSWERS */
.answer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 22px;
  padding: 4px 0;
}

.answer-btn {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.07);
  background: linear-gradient(180deg, #16243b, #0d1728);
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.12s ease,
    border-color 0.15s ease,
    background 0.15s ease,
    box-shadow 0.15s ease,
    color 0.15s ease,
    opacity 0.15s ease;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
  will-change: transform;
}

.answer-btn:hover {
  transform: translateY(-2px) scale(1.04);
  border-color: var(--accent);
  box-shadow: 0 12px 22px rgba(0, 0, 0, 0.28), 0 0 0 1px rgba(78, 161, 255, 0.06);
}

.answer-btn.selected {
  background: linear-gradient(180deg, var(--accent), #2f82e6);
  color: #08121c;
  border-color: #8fd0ff;
  box-shadow: 0 0 0 4px rgba(78, 161, 255, 0.18), 0 12px 22px rgba(0, 0, 0, 0.28);
  transform: scale(1.06);
  animation: popIn 0.2s ease;
}

.answer-btn.correct-answer {
  background: linear-gradient(180deg, var(--green), var(--green-2));
  color: #04140b;
  border-color: #7ef0af;
  box-shadow: 0 0 0 4px rgba(50, 210, 122, 0.18), 0 12px 22px rgba(0, 0, 0, 0.28);
}

.answer-btn.wrong-answer {
  background: linear-gradient(180deg, var(--red), var(--red-2));
  color: #190404;
  border-color: #ffb1b1;
  box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.18), 0 12px 22px rgba(0, 0, 0, 0.28);
}

.answer-btn.review-dim {
  opacity: 0.4;
}

.answer-explanation {
  margin-top: 18px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid rgba(124, 196, 255, 0.18);
  background: rgba(78, 161, 255, 0.07);
  color: var(--text);
}

.answer-explanation h4 {
  margin: 0 0 8px;
  font-size: 16px;
}

#answerExplanationText {
  margin: 0;
  color: #dce7ff;
  line-height: 1.7;
}

.review-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

/* WRITTEN ANSWER SHEET */
.written-answer-sheet {
  margin-top: 18px;
  display: grid;
  gap: 18px;
}

.written-answer-block {
  border: 1px solid rgba(124, 196, 255, 0.14);
  background: linear-gradient(180deg, rgba(17, 27, 44, 0.96), rgba(10, 18, 32, 0.96));
  border-radius: 18px;
  padding: 14px;
  overflow: hidden;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.22);
}

.written-answer-head {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 8px 12px;
  margin-bottom: 12px;
  border-radius: 999px;
  border: 1px solid rgba(124, 196, 255, 0.16);
  background: rgba(78, 161, 255, 0.08);
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
}

.written-answer-image {
  width: 100%;
  height: auto;
  border-radius: 14px;
  background: #fff;
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.18);
}

.written-answer-block.is-missing {
  border-color: rgba(255, 107, 107, 0.2);
  background: linear-gradient(180deg, rgba(42, 20, 26, 0.92), rgba(25, 12, 16, 0.92));
}

.written-answer-missing,
.written-answer-empty {
  padding: 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 107, 107, 0.18);
  background: rgba(255, 107, 107, 0.08);
  color: #ffd3d3;
  font-size: 14px;
  line-height: 1.6;
}

.written-answer-empty {
  border-color: rgba(124, 196, 255, 0.18);
  background: rgba(78, 161, 255, 0.08);
  color: #dce7ff;
}

/* TOOLS */
.question-tools {
  margin-bottom: 20px;
}

.tool-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.jump-wrap {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  margin-bottom: 14px;
}

#jumpInput {
  flex: 1;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #0d1625;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

#jumpInput:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.12);
  background: #101b2d;
}

.question-palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 10px;
}

.palette-btn {
  min-height: 42px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #17233a, #101a2d);
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.12s ease,
    border-color 0.15s ease,
    background 0.15s ease,
    box-shadow 0.15s ease;
  will-change: transform;
}

.palette-btn:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.palette-btn.is-current {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.14);
}

.palette-btn.is-answered {
  background: linear-gradient(180deg, rgba(50, 210, 122, 0.24), rgba(30, 168, 95, 0.18));
}

.palette-btn.is-flagged {
  color: var(--gold);
}

.palette-btn.is-unanswered {
  opacity: 0.92;
}

/* SUBMIT + RESULTS */
.submit-row {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.submit-row .action-btn {
  flex: 1;
  min-width: 170px;
}

/* RESULT SCREEN */
.result-card {
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
  padding: 20px;
}

.result-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top right, rgba(124, 196, 255, 0.12), transparent 30%);
  pointer-events: none;
}

.result-card > * {
  position: relative;
  z-index: 1;
}

.results-hero {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 20px;
  align-items: center;
  margin-bottom: 18px;
}

.score-ring {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at center, #0d1525 58%, transparent 59%),
    conic-gradient(var(--accent) 0deg, var(--accent-2) 220deg, rgba(255,255,255,0.08) 220deg);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06), 0 12px 28px rgba(0,0,0,0.28);
  margin: 0 auto;
}

.score-ring-inner {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: linear-gradient(180deg, #111a2b, #0b1322);
  border: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-ring-value {
  font-size: 34px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}

.score-ring-label {
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.result-headline {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.4px;
}

.result-subtext,
.motivation-banner {
  color: var(--muted);
  line-height: 1.7;
}

.motivation-banner {
  margin-top: 10px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(124, 196, 255, 0.14);
  background: rgba(78, 161, 255, 0.06);
}

.result-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.result-stat {
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  padding: 14px;
}

.result-stat span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-stat strong {
  display: block;
  font-size: 24px;
  line-height: 1.1;
  color: var(--text);
}

.result-card h3 {
  margin-bottom: 12px;
}

.history-card {
  margin-bottom: 20px;
}

.post-result-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.post-result-actions .action-btn {
  flex: 1;
  min-width: 170px;
}

/* BADGES / META */
.badge-none {
  color: var(--muted);
}

.badge-bronze {
  color: var(--bronze);
}

.badge-silver {
  color: var(--silver);
}

.badge-gold {
  color: var(--gold);
}

/* IMAGE MODAL */
.image-modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 15, 0.96);
  z-index: 5000;
  display: none;
  align-items: center;
  justify-content: center;
}

.image-modal-viewport {
  width: 100%;
  height: 100%;
  overflow: auto;
  touch-action: pan-x pan-y pinch-zoom;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 70px 12px 20px;
  position: relative;
}

#modalImage {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(100vh - 100px);
  object-fit: contain;
  transform-origin: center center;
  transition: transform 0.15s ease;
  border-radius: 12px;
  background: #fff;
}

#closeImageModal,
.close-modal-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
  z-index: 2;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

#closeImageModal:hover,
.close-modal-btn:hover {
  transform: scale(1.06);
  border-color: var(--accent);
}

/* MUSIC */
.music-floating {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 9999;
}

.music-float-btn {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, #1b2c4d, #101a2d);
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
  box-shadow: var(--shadow-strong);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.music-float-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.48), 0 0 0 1px rgba(78, 161, 255, 0.08);
}

.music-panel {
  position: absolute;
  right: 0;
  bottom: 72px;
  width: 270px;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 26, 43, 0.98), rgba(8, 14, 26, 0.98));
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.52);
  display: none;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transform: translateY(10px);
  opacity: 0;
  transition: all 0.2s ease;
}

.music-panel.show {
  display: block;
  animation: fadeSlideUp 0.22s ease;
  transform: translateY(0);
  opacity: 1;
}

.music-header {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-2);
  margin-bottom: 12px;
  letter-spacing: 0.2px;
}

.music-row {
  margin-bottom: 12px;
}

.music-row:last-child {
  margin-bottom: 0;
}

.music-row select {
  width: 100%;
  min-height: 42px;
  padding: 9px 12px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 13px;
  outline: none;
}

.music-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.14);
}

.music-row button {
  width: calc(50% - 6px);
  min-height: 40px;
  margin-top: 4px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #17233a, #101a2d);
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  transition: all 0.2s ease;
}

.music-row button:first-child {
  margin-right: 8px;
}

.music-row button:hover {
  background: linear-gradient(180deg, var(--accent), #2f82e6);
  color: #08121c;
  border-color: var(--accent-2);
}

.music-row input[type="range"] {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  height: 6px;
  border-radius: 999px;
  background: var(--line);
  outline: none;
}

.music-row input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.18);
}

.music-row input[type="range"]::-moz-range-thumb {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 0 3px rgba(78, 161, 255, 0.18);
}

.music-label {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  line-height: 1.5;
}

/* SIMPLE ANIMATIONS */
.fade-in {
  animation: fadeIn 0.35s ease;
}

.fade-slide-up {
  animation: fadeSlideUp 0.28s ease;
}

.pop-in {
  animation: popIn 0.24s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* QUIZ LAYOUT */
.quiz-shell {
  display: grid;
  gap: 20px;
}

.quiz-status-card,
.quiz-main-card,
.quiz-controls-card,
.quiz-nav-card {
  background: linear-gradient(180deg, rgba(16, 24, 39, 0.96), rgba(10, 18, 32, 0.95));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.quiz-status-card {
  padding: 14px 16px;
}

.quiz-status-top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.quiz-status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.quiz-status-grid {
  display: grid;
  grid-template-columns: 1fr 120px 120px;
  gap: 10px;
  align-items: stretch;
}

.quiz-progress-block {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  min-width: 0;
}

.quiz-progress-inline {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-progress-inline .progress-bar {
  flex: 1;
}

.quiz-progress-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.quiz-mini-timer {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  border-radius: 14px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 60px;
}

.quiz-mini-timer span {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.quiz-mini-timer strong {
  font-size: 16px;
  line-height: 1;
  color: var(--accent-2);
}

.quiz-main-card {
  padding: 20px;
  border-radius: 18px;
  animation: fadeSlideUp 0.25s ease;
  transition: transform 0.2s ease;
}

.quiz-main-image {
  margin-bottom: 18px;
}

.quiz-main-image .question-image-wrap {
  margin: 0;
}

.quiz-controls-card,
.quiz-nav-card {
  padding: 14px;
}

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

.quiz-section-head h3 {
  margin: 0;
  font-size: 18px;
}

.quiz-section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.quiz-primary-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.quiz-primary-actions .action-btn {
  flex: 1;
  min-width: 140px;
  min-height: 44px;
  font-size: 14px;
}

.quiz-nav-top {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.quiz-nav-top .action-btn {
  min-width: 150px;
  min-height: 40px;
  font-size: 14px;
}

.quiz-nav-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.quiz-nav-row #jumpWrap {
  display: none;
  width: 100%;
}

.quiz-nav-row #jumpWrap.show {
  display: flex;
  width: 100%;
}

.result-card {
  padding: 20px;
}

.result-hero {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 14px;
  align-items: center;
  margin-bottom: 20px;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle, #0d1525 55%, transparent 56%),
    conic-gradient(var(--accent) 0deg, var(--accent-2) 240deg, rgba(255,255,255,0.08) 240deg);
  margin: 0 auto;
}

.score-inner {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #0d1525;
  border: 1px solid rgba(255,255,255,0.06);
}

.score-inner strong {
  font-size: 24px;
}

/* RESPONSIVE */
@media (max-width: 980px) {
  .results-hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .result-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quiz-status-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    width: calc(100% - 18px);
  }

  .quiz-main {
    padding: 14px 0 22px;
  }

  .quiz-shell {
    gap: 12px;
  }

  .quiz-header {
    padding: 14px 0 10px;
  }

  .back-link {
    margin-bottom: 10px;
    padding: 7px 10px;
    font-size: 13px;
  }

  .quiz-header h1 {
    font-size: 22px;
    margin-bottom: 4px;
  }

  .quiz-header p {
    font-size: 12px;
  }

  .topics-grid,
  .quiz-top-cards {
    grid-template-columns: 1fr;
  }

  .info-card,
  .resume-card,
  .result-card,
  .history-card,
  .post-result-actions,
  .quiz-status-card,
  .quiz-main-card,
  .quiz-controls-card,
  .quiz-nav-card {
    padding: 12px;
    border-radius: 14px;
  }

  .quiz-top-cards {
    gap: 12px;
    margin-bottom: 0;
  }

  .info-card h3,
  .resume-card h3,
  .result-card h3,
  .history-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .quiz-home-title {
    font-size: 28px;
  }

  .quiz-home-section-title {
    font-size: 22px;
  }

  .quiz-status-card {
    padding: 10px;
  }

  .quiz-status-top {
    gap: 5px;
    margin-bottom: 8px;
  }

  .quiz-status-pill {
    font-size: 11px;
    padding: 4px 8px;
    min-height: 28px;
  }

  .quiz-status-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .quiz-progress-block {
    gap: 8px;
  }

  .quiz-progress-caption {
    font-size: 12px;
  }

  .quiz-mini-timer {
    min-height: 50px;
    padding: 6px 8px;
    border-radius: 12px;
  }

  .quiz-mini-timer strong {
    font-size: 14px;
  }

  .quiz-main-card {
    padding: 10px;
  }

  .question-image-wrap {
    min-height: 180px;
    padding: 6px;
  }

  #questionImage {
    max-height: 190px;
  }

  #zoomBtn {
    margin-top: 10px;
    min-height: 34px;
    padding: 6px 10px;
    font-size: 12px;
    border-radius: 10px;
  }

  .answer-grid {
    gap: 10px;
    margin-top: 12px;
  }

  .answer-btn {
    width: 52px;
    height: 52px;
    font-size: 16px;
    border-radius: 12px;
  }

  .answer-explanation {
    margin-top: 14px;
    padding: 12px;
    border-radius: 12px;
  }

  .review-note {
    margin-top: 12px;
    padding: 10px 12px;
    font-size: 13px;
  }

  .written-answer-sheet {
    gap: 12px;
  }

  .written-answer-block {
    padding: 10px;
    border-radius: 14px;
  }

  .written-answer-head {
    margin-bottom: 10px;
    font-size: 12px;
  }

  .written-answer-image {
    border-radius: 10px;
  }

  .quiz-controls-card,
  .quiz-nav-card {
    padding: 12px;
  }

  .quiz-section-head {
    margin-bottom: 10px;
  }

  .quiz-section-head h3 {
    font-size: 16px;
  }

  .quiz-section-head p {
    font-size: 12px;
    line-height: 1.5;
  }

  .quiz-primary-actions,
  .quiz-nav-top,
  .submit-row,
  .resume-actions,
  .post-result-actions,
  .tool-row {
    flex-direction: column;
    gap: 8px;
  }

  .quiz-primary-actions .action-btn,
  .quiz-nav-top .action-btn,
  .submit-row .action-btn,
  .resume-actions .action-btn,
  .post-result-actions .action-btn,
  .tool-row .action-btn {
    width: 100%;
    min-width: unset;
    min-height: 44px;
    font-size: 14px;
  }

  .jump-wrap {
    gap: 6px;
    margin-top: 8px;
    margin-bottom: 10px;
  }

  #jumpInput {
    min-height: 38px;
    font-size: 13px;
    padding: 9px 12px;
  }

  .question-palette {
    grid-template-columns: repeat(auto-fill, minmax(34px, 1fr));
    gap: 6px;
  }

  .palette-btn {
    min-height: 40px;
    font-size: 12px;
    border-radius: 10px;
  }

  .result-hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 12px;
    margin-bottom: 14px;
  }

  .score-circle {
    width: 100px;
    height: 100px;
  }

  .score-inner {
    width: 65px;
    height: 65px;
  }

  .score-inner strong {
    font-size: 18px;
  }

  .result-headline,
  #resultHeadline {
    font-size: 24px;
    margin: 0 0 6px;
  }

  #resultMotivation {
    font-size: 14px;
    line-height: 1.6;
  }

  .result-stats-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .music-floating {
    right: 10px;
    bottom: 10px;
  }

  .music-float-btn {
    width: 50px;
    height: 50px;
    font-size: 22px;
  }

  .music-panel {
    width: 85vw;
    bottom: 62px;
    padding: 14px;
  }
}

@media (max-width: 480px) {
  .container {
    width: calc(100% - 16px);
  }

  .quiz-header {
    padding: 12px 0 9px;
  }

  .quiz-header h1 {
    font-size: 20px;
  }

  .quiz-main {
    padding: 12px 0 20px;
  }

  .quiz-shell {
    gap: 10px;
  }

  .info-card,
  .resume-card,
  .result-card,
  .history-card,
  .post-result-actions,
  .quiz-status-card,
  .quiz-main-card,
  .quiz-controls-card,
  .quiz-nav-card {
    padding: 10px;
    border-radius: 13px;
  }

  .quiz-status-pill {
    font-size: 10px;
    padding: 4px 7px;
  }

  .quiz-mini-timer strong {
    font-size: 13px;
  }

  .question-image-wrap {
    min-height: 160px;
    padding: 6px;
  }

  #questionImage {
    max-height: 170px;
  }

  .answer-btn {
    width: 44px;
    height: 44px;
    font-size: 15px;
  }

  .written-answer-block {
    padding: 8px;
  }

  .question-palette {
    grid-template-columns: repeat(auto-fill, minmax(32px, 1fr));
    gap: 5px;
  }

  .palette-btn {
    min-height: 32px;
    font-size: 11px;
  }

  .score-circle {
    width: 96px;
    height: 96px;
  }

  .score-inner {
    width: 62px;
    height: 62px;
  }

  .score-inner strong {
    font-size: 17px;
  }
}

/* TOUCH + PERFORMANCE */
button,
.action-btn,
.answer-btn,
.palette-btn,
.music-float-btn {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.action-btn:active,
.answer-btn:active,
.palette-btn:active,
.music-float-btn:active {
  transform: scale(0.93);
  transition: transform 0.05s ease;
}

.action-btn,
.answer-btn,
.palette-btn {
  will-change: transform;
  transition:
    transform 0.12s ease,
    background 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

html,
body {
  touch-action: manipulation;
}

* {
  -webkit-overflow-scrolling: touch;
}

button {
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.action-btn:active,
.answer-btn:active {
  box-shadow: 0 4px 10px rgba(0,0,0,0.25);
}

.topic-card.card-touch-active {
  transform: scale(0.985);
  transition: transform 0.08s ease;
}

/* DESKTOP HOVER ONLY */
@media (hover: hover) {
  .answer-btn:hover {
    transform: translateY(-2px) scale(1.05);
  }

  .action-btn:hover {
    transform: translateY(-2px);
  }
}

/* =========================
   HINT + IMAGE ACTIONS
========================= */

.question-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  position: sticky;
  top: 0;
  z-index: 5;
  padding-bottom: 8px;
  background: linear-gradient(180deg, rgba(10, 18, 32, 0.98), rgba(10, 18, 32, 0.78));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.question-toolbar .action-btn {
  min-height: 38px;
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 10px;
  background: rgba(20, 30, 50, 0.78);
  border: 1px solid rgba(124, 196, 255, 0.18);
}

#zoomBtn {
  margin-top: 0 !important;
  align-self: auto !important;
}

/* =========================
   HINT BOX
========================= */

.hint-box {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(124, 196, 255, 0.18);
  background:
    linear-gradient(180deg, rgba(78, 161, 255, 0.08), rgba(78, 161, 255, 0.03));
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.25);
  animation: fadeSlideUp 0.25s ease;
}

.hint-box-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.hint-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: 0.2px;
}

.hint-close-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
  transition: all 0.18s ease;
}

.hint-close-btn:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}

.hint-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hint-section {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.03);
}

.hint-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.hint-value {
  font-size: 14px;
  line-height: 1.7;
  color: #dce7ff;
  word-break: break-word;
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;
}

/* =========================
   MOBILE OPTIMIZATION
========================= */

@media (max-width: 768px) {
  .question-toolbar {
    gap: 8px;
    margin-bottom: 10px;
    padding-bottom: 6px;
  }

  .question-toolbar .action-btn {
    min-height: 34px;
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 9px;
  }

  .hint-box {
    padding: 12px;
    border-radius: 12px;
  }

  .hint-title {
    font-size: 15px;
  }

  .hint-content {
    gap: 8px;
  }

  .hint-section {
    padding: 9px 10px;
    border-radius: 10px;
  }

  .hint-label {
    font-size: 11px;
  }

  .hint-value {
    font-size: 13px;
    line-height: 1.65;
  }
}

@media (max-width: 768px) {
  .quiz-status-card {
    position: sticky;
    top: 82px;
    z-index: 20;
  }

  .quiz-controls-card {
    position: sticky;
    bottom: 8px;
    z-index: 25;
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.38);
  }

  .quiz-primary-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .quiz-primary-actions .action-btn {
    min-width: 0;
    padding: 10px 8px;
    font-size: 13px;
  }

  #submitQuizBtn {
    grid-column: 1 / -1;
  }

  .quiz-main {
    padding-bottom: 110px;
  }
}

/* =========================
   PAGE REFRESH LOADING
========================= */

.page-is-refreshing::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(5, 10, 18, 0.85);
  backdrop-filter: blur(6px);
  z-index: 99999;
}

.page-is-refreshing::after {
  content: "Refreshing...";
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 14px 22px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-2);
  background: rgba(20, 30, 50, 0.95);
  border: 1px solid var(--line);
  box-shadow: 0 12px 30px rgba(0,0,0,0.4);
  z-index: 100000;
}

/* =========================
   COLLAPSIBLE TOP CARDS
========================= */

.collapsible-top-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.collapsible-card {
  padding: 0;
  overflow: hidden;
  border-radius: 18px;
}

.collapse-header {
  width: 100%;
  min-height: 64px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: none;
  background:
    linear-gradient(180deg, rgba(18, 28, 45, 0.98), rgba(10, 18, 32, 0.98));
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  text-align: left;
}

.collapse-header:hover {
  background:
    linear-gradient(180deg, rgba(24, 37, 60, 0.98), rgba(12, 21, 36, 0.98));
}

.collapse-title {
  font-size: 17px;
  letter-spacing: -0.2px;
}

.collapse-arrow {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(78, 161, 255, 0.10);
  border: 1px solid rgba(124, 196, 255, 0.18);
  color: var(--accent-2);
  font-size: 18px;
  transition: transform 0.25s ease, background 0.2s ease, border-color 0.2s ease;
  flex-shrink: 0;
}

.collapsible-card.open .collapse-arrow {
  transform: rotate(180deg);
}

.collapse-content {
  padding: 0 18px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(255,255,255,0.015);
}

.collapse-content[hidden] {
  display: none !important;
}

.collapse-content #attemptInfo,
.collapse-content #performanceSummary {
  padding-top: 14px;
}

@media (max-width: 768px) {
  .collapsible-top-cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .collapse-header {
    min-height: 56px;
    padding: 14px 14px;
  }

  .collapse-title {
    font-size: 15px;
  }

  .collapse-content {
    padding: 0 14px 14px;
  }
}

.collapsible-card h3 {
  display: none;
}

.collapse-header {
  border-bottom: 1px solid var(--line);
}

.collapsible-card.open .collapse-header {
  border-bottom: none;
}

.collapsible-card {
  transition: all 0.25s ease;
}

.collapsible-card.open {
  background: linear-gradient(
    180deg,
    rgba(20, 30, 50, 0.98),
    rgba(10, 18, 32, 0.98)
  );
  box-shadow: var(--shadow-blue);
}

.collapse-header:active {
  transform: scale(0.98);
}

.answer-btn,
.palette-btn,
.action-btn {
  transition:
    background 0.1s ease,
    border-color 0.1s ease,
    box-shadow 0.1s ease,
    color 0.1s ease;
}

@media (max-width: 768px) {
  .answer-btn:hover,
  .action-btn:hover,
  .palette-btn:hover {
    transform: none;
  }

  .answer-btn:active,
  .action-btn:active,
  .palette-btn:active {
    transform: scale(0.97);
  }
}

/* =========================
   QUIZ START + GAME MODE
========================= */

.quiz-start-card {
  min-height: 360px;
  display: block;
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(124, 196, 255, 0.18);
  background:
    radial-gradient(circle at top right, rgba(78, 161, 255, 0.18), transparent 34%),
    linear-gradient(180deg, rgba(16, 24, 39, 0.98), rgba(10, 18, 32, 0.96));
  box-shadow: var(--shadow-strong);
}

.quiz-start-content {
  min-height: 300px;
  display: grid;
  place-items: center;
  text-align: center;
  gap: 14px;
}

.quiz-start-content h2 {
  margin: 0;
  font-size: 32px;
}

.quiz-start-content p {
  margin: 0;
  max-width: 520px;
  color: var(--muted);
}

#startQuizBtn {
  min-width: 220px;
  min-height: 58px;
  font-size: 18px;
  border-radius: 18px;
}

body:not(.quiz-playing):not(.quiz-reviewing) .quiz-status-card,
body:not(.quiz-playing):not(.quiz-reviewing) .quiz-main-card,
body:not(.quiz-playing):not(.quiz-reviewing) .quiz-controls-card,
body:not(.quiz-playing):not(.quiz-reviewing) .quiz-nav-card {
  display: none;
}

@media (max-width: 900px) and (orientation: portrait) {
  body.quiz-landscape-mode::before {
    content: "Rotate your phone to landscape";
    position: fixed;
    inset: 0;
    z-index: 999999;
    display: grid;
    place-items: center;
    padding: 24px;
    text-align: center;
    background: #07101b;
    color: var(--text);
    font-size: 22px;
    font-weight: 800;
  }
}

@media (orientation: landscape) {
  body.quiz-game-mode {
    height: 100dvh !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .quiz-header,
  body.quiz-game-mode .motivation-bar,
  body.quiz-game-mode .quiz-top-cards,
  body.quiz-game-mode .quiz-nav-card,
  body.quiz-game-mode .history-card,
  body.quiz-game-mode .result-card,
  body.quiz-game-mode .post-result-actions,
  body.quiz-game-mode footer,
  body.quiz-game-mode .music-floating {
    display: none !important;
  }

  body.quiz-game-mode .quiz-main {
    height: 100dvh !important;
    padding: 0 !important;
    margin: 0 !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .container {
    width: 100% !important;
    max-width: none !important;
    height: 100% !important;
    margin: 0 !important;
  }

  body.quiz-game-mode .quiz-shell {
    height: 100dvh !important;
    display: grid !important;
    grid-template-rows: 44px minmax(0, 1fr) 66px !important;
    gap: 6px !important;
    padding: 6px !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .quiz-status-card {
    grid-row: 1 !important;
    position: static !important;
    display: block !important;
    padding: 4px !important;
    margin: 0 !important;
    border-radius: 14px !important;
    min-height: 0 !important;
  }

  body.quiz-game-mode .quiz-status-top {
    height: 100% !important;
    display: grid !important;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 6px !important;
    margin: 0 !important;
  }

  body.quiz-game-mode .quiz-status-pill {
    height: 36px !important;
    min-height: 36px !important;
    padding: 0 8px !important;
    font-size: 14px !important;
    border-radius: 999px !important;
  }

  body.quiz-game-mode .quiz-main-card {
    grid-row: 2 !important;
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) 66px !important;
    gap: 6px !important;
    height: 100% !important;
    min-height: 0 !important;
    padding: 6px !important;
    margin: 0 !important;
    border-radius: 14px !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .quiz-main-image {
    height: 100% !important;
    min-height: 0 !important;
    margin: 0 !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .question-image-wrap {
    height: 100% !important;
    min-height: 0 !important;
    padding: 4px !important;
    margin: 0 !important;
    border-radius: 12px !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode #questionImage {
    width: 100% !important;
    height: 100% !important;
    max-height: none !important;
    object-fit: contain !important;
  }

  body.quiz-game-mode .question-toolbar {
    position: absolute !important;
    top: 6px !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    margin: 0 !important;
    padding: 0 !important;
    background: transparent !important;
    z-index: 20 !important;
  }

  body.quiz-game-mode #zoomBtn {
    min-height: 28px !important;
    padding: 4px 12px !important;
    font-size: 12px !important;
    border-radius: 10px !important;
  }

  body.quiz-game-mode .answer-grid {
    height: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    display: grid !important;
    grid-template-columns: 1fr !important;
    align-content: center !important;
    justify-items: center !important;
    gap: 7px !important;
  }

  body.quiz-game-mode .answer-btn {
    width: 52px !important;
    height: 52px !important;
    border-radius: 50% !important;
    font-size: 18px !important;
  }

  body.quiz-game-mode .answer-explanation,
  body.quiz-game-mode .review-note {
    display: none !important;
  }

  body.quiz-game-mode .quiz-controls-card {
    grid-row: 3 !important;
    position: relative !important;
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) 210px !important;
    gap: 6px !important;
    padding: 5px !important;
    margin: 0 !important;
    border-radius: 14px !important;
    min-height: 0 !important;
    overflow: hidden !important;
  }

  body.quiz-game-mode .quiz-section-head {
    display: none !important;
  }

  body.quiz-game-mode .quiz-primary-actions {
    height: 100% !important;
    width: 100% !important;
    display: grid !important;
    grid-template-columns: 1fr 1fr 1fr !important;
    gap: 6px !important;
  }

  body.quiz-game-mode .quiz-primary-actions .action-btn {
    width: 100% !important;
    min-width: 0 !important;
    min-height: 50px !important;
    padding: 6px !important;
    font-size: 14px !important;
    border-radius: 12px !important;
  }

  body.quiz-game-mode #submitQuizBtn {
    grid-column: auto !important;
  }

  body.quiz-game-mode .quiz-status-grid {
    position: static !important;
    width: 100% !important;
    height: 100% !important;
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
    pointer-events: none !important;
  }

  body.quiz-game-mode .quiz-progress-block {
    display: none !important;
  }

  body.quiz-game-mode .quiz-mini-timer {
    height: 100% !important;
    min-height: 50px !important;
    padding: 4px !important;
    border-radius: 12px !important;
    text-align: center !important;
  }

  body.quiz-game-mode .quiz-mini-timer span {
    font-size: 8px !important;
    line-height: 1 !important;
    margin-bottom: 4px !important;
  }

  body.quiz-game-mode .quiz-mini-timer strong {
    font-size: 14px !important;
    line-height: 1 !important;
  }
}

@media (max-width: 900px) and (orientation: landscape) {
  body.quiz-game-mode .quiz-shell {
    grid-template-rows: 42px minmax(0, calc(100dvh - 124px)) 64px !important;
    gap: 6px !important;
    padding: 6px !important;
  }

  body.quiz-game-mode .quiz-main-card {
    height: calc(100dvh - 124px) !important;
    max-height: calc(100dvh - 124px) !important;
  }

  body.quiz-game-mode .quiz-status-pill {
    height: 34px !important;
    min-height: 34px !important;
    font-size: 12px !important;
  }

  body.quiz-game-mode .quiz-main-card {
    grid-template-columns: minmax(0, 1fr) 58px !important;
  }

  body.quiz-game-mode .answer-btn {
    width: 46px !important;
    height: 46px !important;
    font-size: 17px !important;
  }

  body.quiz-game-mode .quiz-controls-card {
    grid-template-columns: minmax(0, 1fr) 188px !important;
  }

  body.quiz-game-mode .quiz-primary-actions .action-btn {
    min-height: 48px !important;
    font-size: 12px !important;
  }

  body.quiz-game-mode .quiz-mini-timer {
    min-height: 48px !important;
  }

  body.quiz-game-mode .quiz-mini-timer strong {
    font-size: 13px !important;
  }
}

/* =========================
   DN GLOBAL GLASS THEME FIX
========================= */

body.dn-glass-pack-1 .quiz-header,
body.dn-glass-pack-1 .topic-card,
body.dn-glass-pack-1 .info-card,
body.dn-glass-pack-1 .resume-card,
body.dn-glass-pack-1 .quiz-progress-section,
body.dn-glass-pack-1 .question-card,
body.dn-glass-pack-1 .question-tools,
body.dn-glass-pack-1 .result-card,
body.dn-glass-pack-1 .history-card,
body.dn-glass-pack-1 .post-result-actions,
body.dn-glass-pack-1 .quiz-start-card,
body.dn-glass-pack-1 .quiz-status-card,
body.dn-glass-pack-1 .quiz-main-card,
body.dn-glass-pack-1 .quiz-controls-card,
body.dn-glass-pack-1 .quiz-nav-card,
body.dn-glass-pack-1 .skeleton-card,
body.dn-glass-pack-2 .quiz-header,
body.dn-glass-pack-2 .topic-card,
body.dn-glass-pack-2 .info-card,
body.dn-glass-pack-2 .resume-card,
body.dn-glass-pack-2 .quiz-progress-section,
body.dn-glass-pack-2 .question-card,
body.dn-glass-pack-2 .question-tools,
body.dn-glass-pack-2 .result-card,
body.dn-glass-pack-2 .history-card,
body.dn-glass-pack-2 .post-result-actions,
body.dn-glass-pack-2 .quiz-start-card,
body.dn-glass-pack-2 .quiz-status-card,
body.dn-glass-pack-2 .quiz-main-card,
body.dn-glass-pack-2 .quiz-controls-card,
body.dn-glass-pack-2 .quiz-nav-card,
body.dn-glass-pack-2 .skeleton-card,
body.dn-glass-pack-3 .quiz-header,
body.dn-glass-pack-3 .topic-card,
body.dn-glass-pack-3 .info-card,
body.dn-glass-pack-3 .resume-card,
body.dn-glass-pack-3 .quiz-progress-section,
body.dn-glass-pack-3 .question-card,
body.dn-glass-pack-3 .question-tools,
body.dn-glass-pack-3 .result-card,
body.dn-glass-pack-3 .history-card,
body.dn-glass-pack-3 .post-result-actions,
body.dn-glass-pack-3 .quiz-start-card,
body.dn-glass-pack-3 .quiz-status-card,
body.dn-glass-pack-3 .quiz-main-card,
body.dn-glass-pack-3 .quiz-controls-card,
body.dn-glass-pack-3 .quiz-nav-card,
body.dn-glass-pack-3 .skeleton-card {
  background:
    radial-gradient(circle at top right, rgba(var(--dn-glass-rgb, 78, 161, 255), 0.22), transparent 36%),
    linear-gradient(180deg, rgba(19, 31, 53, 0.58), rgba(8, 15, 28, 0.42));
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow:
    0 22px 60px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(22px) saturate(1.35);
  -webkit-backdrop-filter: blur(22px) saturate(1.35);
}

body.dn-glass-pack-2 button,
body.dn-glass-pack-2 .action-btn,
body.dn-glass-pack-2 .back-link,
body.dn-glass-pack-3 button,
body.dn-glass-pack-3 .action-btn,
body.dn-glass-pack-3 .back-link {
  background:
    radial-gradient(circle at top right, rgba(var(--dn-glass-rgb, 78, 161, 255), 0.28), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.07));
  border-color: rgba(255, 255, 255, 0.2);
  color: #eef7ff;
  backdrop-filter: blur(18px) saturate(1.24);
  -webkit-backdrop-filter: blur(18px) saturate(1.24);
}

body.dn-glass-pack-2 .primary-btn,
body.dn-glass-pack-3 .primary-btn {
  background:
    radial-gradient(circle at top right, rgba(255, 255, 255, 0.3), transparent 34%),
    linear-gradient(135deg, rgba(var(--dn-glass-rgb, 78, 161, 255), 0.95), rgba(124, 196, 255, 0.78));
  color: #04101f;
}