/* InsightSerenity Quiz Platform — style.css */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Space+Grotesk:wght@700;800&display=swap');

:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --primary: #ffc451;
  --primary-dark: #e6b048;
  --border: #e2e8f0;
  --radius: 0.75rem;
  --correct: #10b981;
  --wrong: #ef4444;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --text: #f1f1f1;
    --text-muted: #9ca3af;
    --border: #2a2d3e;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}

*, *::before, *::after { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  margin: 0;
  min-height: 100vh;
  transition: background 0.2s, color 0.2s;
}

/* ── Screen wrapper ── */
.screen {
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.screen.active {
  opacity: 1;
  transform: translateY(0);
}

/* ── Show / Hide ── */
.hidden { display: none !important; }

/* ── Top Nav (fixed, all screens) ── */
.top-nav {
  position: fixed;
  top: 0;
  right: 0;
  padding: .75rem 1.5rem;
  z-index: 1000;
}

/* ── Back to Main ── */
.back-to-main {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  padding: .375rem .875rem;
  border: 1.5px solid rgba(255,196,81,0.3);
  border-radius: .5rem;
  font-size: .8125rem;
  font-weight: 600;
  color: #ffc451;
  background: rgba(255,196,81,0.08);
  text-decoration: none;
  transition: all .2s;
  white-space: nowrap;
}
.back-to-main:hover { background: #ffc451; color: #000; }

/* ─────────────────────────────────────── */
/* HOME SCREEN                             */
/* ─────────────────────────────────────── */

.logo {
  text-align: center;
  margin-bottom: 0.5rem;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 800;
  margin: 0 0 0.375rem;
  color: var(--text);
  font-family: 'Space Grotesk', sans-serif;
}

.logo p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
}

.home-settings {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.setting-group label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setting-group select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.4rem 0.75rem;
  color: var(--text);
  font-size: 0.8rem;
  font-family: 'Inter', sans-serif;
  outline: none;
  cursor: pointer;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.cat-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.cat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.2s;
}

.cat-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.cat-card.selected {
  border-color: var(--primary);
  background: rgba(255, 196, 81, 0.05);
}

.cat-card.selected .cat-name {
  color: var(--primary);
}

.cat-icon {
  font-size: 2rem;
  position: relative;
  z-index: 1;
}

.cat-name {
  font-weight: 700;
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
  color: var(--text);
}

.cat-count {
  font-size: 0.72rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}

.cat-check {
  position: absolute;
  top: 0.625rem;
  right: 0.625rem;
  width: 1.25rem;
  height: 1.25rem;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  opacity: 0;
  transition: opacity 0.2s;
}

.cat-card.selected .cat-check {
  opacity: 1;
}

.start-btn {
  width: 100%;
  padding: 0.875rem;
  background: var(--primary);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  margin-top: 0.5rem;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.01em;
}

.start-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

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

/* ─────────────────────────────────────── */
/* QUIZ SCREEN                             */
/* ─────────────────────────────────────── */

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 0.75rem;
}

.q-counter {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
}

.progress-bar-wrap {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.timer-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 3rem;
}

.timer {
  font-size: 1.25rem;
  font-weight: 800;
  text-align: center;
  color: var(--text);
  font-family: 'Space Grotesk', sans-serif;
  transition: color 0.2s;
  line-height: 1;
}

.timer.warning {
  color: var(--wrong);
  animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.timer-label {
  font-size: 0.55rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

.question-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-badge {
  background: rgba(255, 196, 81, 0.12);
  color: var(--primary);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-weight: 700;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.question-text {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text);
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-top: 1.5rem;
}

.option {
  padding: 0.875rem 1.25rem;
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  background: var(--bg-card);
  color: var(--text);
}

.option:hover:not(.selected):not(.correct):not(.wrong) {
  border-color: var(--primary);
  background: rgba(255, 196, 81, 0.04);
}

.option.selected {
  border-color: var(--primary);
  background: rgba(255, 196, 81, 0.08);
}

.option.correct {
  border-color: var(--correct);
  background: rgba(16, 185, 129, 0.1);
  color: var(--correct);
}

.option.wrong {
  border-color: var(--wrong);
  background: rgba(239, 68, 68, 0.1);
  color: var(--wrong);
}

.option-letter {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: all 0.15s;
}

.option.correct .option-letter {
  background: var(--correct);
  color: white;
}

.option.wrong .option-letter {
  background: var(--wrong);
  color: white;
}

.option.selected:not(.correct):not(.wrong) .option-letter {
  background: var(--primary);
  color: #000;
}

.explanation {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 196, 81, 0.06);
  border-left: 3px solid var(--primary);
  border-radius: 0 0.5rem 0.5rem 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.65;
  display: none;
  animation: fadeIn 0.3s ease;
}

.explanation.show { display: block; }

.explanation strong {
  color: var(--text);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.next-btn {
  width: 100%;
  padding: 0.75rem;
  background: var(--primary);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  display: none;
  font-family: 'Inter', sans-serif;
  transition: background 0.15s;
}

.next-btn.show { display: block; }

.next-btn:hover { background: var(--primary-dark); }

/* ─────────────────────────────────────── */
/* RESULT SCREEN                           */
/* ─────────────────────────────────────── */

.result-screen {
  text-align: center;
}

.result-screen h2 {
  font-size: 1.25rem;
  font-weight: 800;
  margin: 0 0 0.375rem;
  font-family: 'Space Grotesk', sans-serif;
}

.result-screen > p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 4px solid var(--primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-family: 'Space Grotesk', sans-serif;
  background: rgba(255, 196, 81, 0.05);
}

.score-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.score-total {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

.grade-badge {
  display: inline-block;
  background: rgba(255, 196, 81, 0.12);
  color: var(--primary);
  border-radius: 999px;
  padding: 0.375rem 1.25rem;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  letter-spacing: 0.01em;
}

.result-breakdown {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0 0 1.5rem;
}

.result-stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.result-stat .val {
  font-size: 1.25rem;
  font-weight: 800;
  font-family: 'Space Grotesk', sans-serif;
}

.result-stat.correct .val { color: var(--correct); }
.result-stat.wrong-stat .val { color: var(--wrong); }
.result-stat.time-stat .val { color: var(--primary); }

.result-stat .lbl {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.result-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.play-again-btn {
  padding: 0.75rem 2rem;
  background: var(--primary);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-weight: 800;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  transition: background 0.15s;
}

.play-again-btn:hover { background: var(--primary-dark); }

.change-category-btn {
  padding: 0.75rem 2rem;
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  transition: all 0.15s;
}

.change-category-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ── Review List ── */
.review-list {
  text-align: left;
  margin-top: 1.5rem;
}

.review-list h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.review-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  margin-bottom: 0.625rem;
  box-shadow: var(--shadow);
  position: relative;
  padding-left: 1.25rem;
}

.review-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 0.5rem 0 0 0.5rem;
}

.review-item.correct::before { background: var(--correct); }
.review-item.wrong::before { background: var(--wrong); }

.review-item .q-num {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.review-item .q {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--text);
}

.review-item .a {
  font-size: 0.78rem;
  font-weight: 500;
}

.review-item.correct .a { color: var(--correct); }
.review-item.wrong .a { color: var(--wrong); }

.review-item .correct-ans {
  font-size: 0.75rem;
  color: var(--correct);
  margin-top: 0.2rem;
  font-weight: 500;
}

/* ── Difficulty Buttons ── */
.difficulty-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.difficulty-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.difficulty-btns {
  display: inline-flex;
  gap: 0.375rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  padding: 0.25rem;
}

.diff-btn {
  background: transparent;
  border: none;
  border-radius: 0.375rem;
  padding: 0.35rem 0.875rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.diff-btn.active {
  background: var(--primary);
  color: #000;
}

.diff-btn:hover:not(.active) {
  color: var(--primary);
}

.diff-hint {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.75;
}

/* ── Practice Toggle ── */
.practice-toggle {
  display: flex;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.practice-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg-card);
  transition: border-color 0.15s;
}

.practice-label:hover {
  border-color: var(--primary);
}

.practice-label input[type=checkbox] {
  accent-color: var(--primary);
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

/* ── Leaderboard ── */
.leaderboard-section {
  margin-top: 2rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.lb-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}

.lb-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lb-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0.625rem;
  border-radius: 0.375rem;
  background: var(--bg);
  font-size: 0.82rem;
}

.lb-icon { font-size: 1rem; }
.lb-cat { flex: 1; font-weight: 600; color: var(--text); }
.lb-score {
  font-weight: 800;
  color: var(--primary);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
}

.lb-empty {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin: 0;
  padding: 0.5rem 0;
}

/* ── Streak Display ── */
.streak-display {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 196, 81, 0.12);
  color: var(--primary);
  border-radius: 999px;
  padding: 0.2rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

/* ── Sound Button ── */
.sound-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.15s;
  flex-shrink: 0;
}

.sound-btn:hover {
  border-color: var(--primary);
  background: rgba(255, 196, 81, 0.08);
}

/* ── Share Button ── */
.share-btn {
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  transition: all 0.15s;
}

.share-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ── Streak stat on result screen ── */
.result-stat.streak-stat .val { color: var(--primary); }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(1rem);
  background: #1a1d27;
  color: #f1f1f1;
  border: 1px solid rgba(255,196,81,0.3);
  padding: 0.625rem 1.25rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .top-nav {
    padding: 0.625rem 1rem;
  }
  .screen {
    padding-top: 3.5rem;
  }
  .quiz-header {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.875rem 1rem;
  }
  .progress-bar-wrap {
    order: 10;
    width: 100%;
    margin-top: 0.25rem;
  }
}

@media (max-width: 600px) {
  .screen { padding: 3.5rem 1rem 1.25rem; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .result-breakdown { grid-template-columns: repeat(3, 1fr); }
  .logo h1 { font-size: 1.25rem; }
  .logo p  { font-size: 0.8rem; }
  .question-card { padding: 1.125rem; }
  .question-text { font-size: 0.9rem; }
  .option { padding: 0.75rem 0.875rem; font-size: 0.8rem; }
  .difficulty-btns { flex-wrap: wrap; gap: 0.375rem; }
  .diff-btn { flex: 1; min-width: 80px; text-align: center; }
  .result-actions { flex-direction: column; gap: 0.625rem; }
  .result-actions button { width: 100%; }
  .score-circle { width: 110px; height: 110px; }
  .score-num { font-size: 2.5rem; }
  .leaderboard-section { margin-top: 1.25rem; }
  .quiz-header { padding: 0.75rem 1rem; }
  .timer { font-size: 1.25rem; }
  .q-counter { font-size: 0.78rem; }
  .next-btn { width: calc(100% - 2rem); margin: 0 1rem 1rem; }
}

@media (max-width: 380px) {
  .category-grid { grid-template-columns: 1fr; }
  .result-breakdown { gap: 0.375rem; }
  .result-stat .val { font-size: 1.5rem; }
  .back-to-main { font-size: 0.7rem; padding: 0.275rem 0.5rem; }
}