/* ============================================================
   THEME — Inspired by برنامج درجات ميراك
   Dark background + Red accent palette
============================================================ */
:root {
  --bg:      #121212;
  --bg2:     #1A1A1A;
  --bg3:     #222222;
  --card:    #1E1E1E;
  --card2:   #252525;
  --accent:  #FF3B3B;
  --accent2: #FF6B6B;
  --accent3: #E53935;
  --gold:    #FFD700;
  --text:    #FFFFFF;
  --text2:   #CCCCCC;
  --text3:   #888888;
  --border:  #333333;
  --success: #4CAF50;
  --danger:  #FF3B3B;
  --glow:    0 0 20px rgba(255,59,59,0.35);
  --glow2:   0 0 30px rgba(229,57,53,0.45);
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: 'Cairo', 'Tajawal', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  font-size: 13px;
}

/* subtle grid overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,59,59,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,59,59,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Floating orbs */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: floatOrb 8s ease-in-out infinite;
}
.orb1 { width:350px; height:350px; background:rgba(255,59,59,0.07); top:-80px; left:-80px; animation-delay:0s; }
.orb2 { width:280px; height:280px; background:rgba(229,57,53,0.08); bottom:-60px; right:-60px; animation-delay:3s; }
.orb3 { width:180px; height:180px; background:rgba(255,107,107,0.05); top:50%; left:60%; animation-delay:6s; }

@keyframes floatOrb {
  0%,100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-25px) scale(1.04); }
}

/* ===== MAIN ===== */
main {
  position: relative;
  z-index: 5;
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* ===== WELCOME SCREEN ===== */
.welcome-hero {
  text-align: center;
  padding: 48px 16px 20px;
  animation: fadeIn 0.6s ease;
}

.welcome-title-block {
  margin-bottom: 28px;
}

.welcome-main-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(255,59,59,0.5);
  margin-bottom: 8px;
  line-height: 1.2;
}

.welcome-teacher {
  font-size: 0.82rem;
  color: var(--text3);
  font-weight: 500;
}

/* Start button */
.start-btn {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 14px 46px;
  border-radius: 12px;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.3px;
  transition: all 0.3s;
  box-shadow: 0 6px 24px rgba(255,59,59,0.4);
  display: inline-block;
}
.start-btn:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 12px 36px rgba(255,59,59,0.55);
  background: var(--accent3);
}

/* ===== STATS SECTION ===== */
.stats-section {
  margin-top: 30px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 18px 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

.stat-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 8px;
  text-align: center;
}

.stat-val {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--text2);
  line-height: 1.1;
}
.correct-val { color: var(--success); }
.wrong-val   { color: var(--danger); }
.pct-val     { color: var(--gold); }

.stat-label {
  font-size: 0.67rem;
  color: var(--text3);
  margin-top: 4px;
  font-weight: 600;
}

.reset-stats-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text3);
  padding: 7px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  transition: all 0.2s;
}
.reset-stats-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* ===== TOPIC SCREEN ===== */
#topic-screen { animation: fadeIn 0.45s ease; }

.screen-header-row {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.screen-title {
  text-align: center;
  margin-bottom: 24px;
}

.screen-title h2 {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--accent);
  text-shadow: 0 0 15px rgba(255,59,59,0.3);
  margin-bottom: 5px;
}

.screen-title p { color: var(--text3); font-size: 0.78rem; }

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

/* Topics grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 12px;
}

.topic-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: right;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: slideUp 0.35s ease both;
}

.topic-btn:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(255,59,59,0.2);
}

@keyframes slideUp {
  from { opacity:0; transform:translateY(24px); }
  to { opacity:1; transform:translateY(0); }
}

.topic-info h3 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
  line-height: 1.4;
}

.topic-info p { font-size: 0.7rem; color: var(--text3); }

.topic-tag {
  font-size: 0.6rem;
  padding: 2px 7px;
  border-radius: 18px;
  margin-top: 5px;
  display: inline-block;
  font-weight: 700;
}

/* Category cards */
.category-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
  animation: slideUp 0.35s ease both;
}
.category-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(255,59,59,0.2);
}
.category-card h3 { font-size: 0.95rem; font-weight: 800; color: var(--text); margin-bottom: 6px; }
.category-card p { font-size: 0.72rem; color: var(--text3); }
.category-accent-bar {
  position: absolute; top:0; left:0; right:0; height:3px;
  border-radius: 14px 14px 0 0;
}

/* Back nav button */
.back-nav-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 7px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  transition: all 0.2s;
}
.back-nav-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Topic note box */
.topic-note-box {
  background: rgba(255,59,59,0.07);
  border: 1px solid rgba(255,59,59,0.22);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.75rem;
  color: var(--accent2);
  margin-bottom: 14px;
  line-height: 1.7;
}

/* ===== GAME SCREEN ===== */
#game-screen { display:none; animation: fadeIn 0.45s ease; }

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 10px;
}

.back-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  transition: all 0.2s;
}
.back-btn:hover { border-color: var(--accent); color: var(--accent); }

.current-topic {
  background: linear-gradient(135deg, var(--accent3), var(--accent));
  border-radius: 22px;
  padding: 6px 16px;
  font-size: 0.78rem;
  font-weight: 700;
}

.new-q-btn {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 8px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 800;
  transition: all 0.2s;
}
.new-q-btn:hover { transform: scale(1.05); box-shadow: var(--glow); background: var(--accent3); }

/* Question Card */
.question-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 22px;
  margin-bottom: 14px;
  position: relative;
  overflow: hidden;
  animation: cardPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes cardPop {
  from { opacity:0; transform: scale(0.95); }
  to { opacity:1; transform: scale(1); }
}

.question-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3));
}

.q-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,59,59,0.12);
  border: 1px solid rgba(255,59,59,0.3);
  border-radius: 18px;
  padding: 3px 12px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}

.question-text {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.85;
  color: var(--text);
}

/* Action Buttons */
.action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-solution {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  border: none;
  color: #fff;
  padding: 11px 22px;
  border-radius: 11px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  transition: all 0.3s;
  display: flex; align-items: center; justify-content: center; gap: 7px;
}
.btn-solution:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow);
}

/* Export button */
.export-img-btn {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 8px 18px;
  border-radius: 9px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all 0.2s;
  width: 100%;
}
.export-img-btn:hover {
  border-color: var(--accent2);
  color: var(--accent2);
}

/* Solution Panel */
.solution-panel {
  display: none;
  background: var(--card2);
  border: 1px solid rgba(255,59,59,0.3);
  border-radius: 16px;
  padding: 20px 22px;
  margin-bottom: 16px;
  animation: slideDown 0.35s ease;
}

@keyframes slideDown {
  from { opacity:0; transform: translateY(-12px); }
  to { opacity:1; transform: translateY(0); }
}

.solution-panel.show { display: block; }

.solution-panel h4 {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 7px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* Self-feedback row (appears after solution) */
.feedback-row {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.fb-btn {
  flex: 1;
  padding: 9px 12px;
  border-radius: 10px;
  border: 1.5px solid;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center; gap: 5px;
}

.fb-correct {
  border-color: var(--success);
  color: var(--success);
  background: rgba(76,175,80,0.05);
}
.fb-correct:hover, .fb-correct.active {
  background: rgba(76,175,80,0.15);
  box-shadow: 0 0 12px rgba(76,175,80,0.25);
}

.fb-wrong {
  border-color: var(--danger);
  color: var(--danger);
  background: rgba(255,59,59,0.05);
}
.fb-wrong:hover, .fb-wrong.active {
  background: rgba(255,59,59,0.15);
}

/* Solution internals */
.genotype-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.genotype-chip {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 7px 12px;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  color: var(--accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 90px;
}
.genotype-chip .pheno {
  font-size: 0.65rem;
  color: var(--text2);
  font-family: 'Cairo', sans-serif;
  font-weight: 600;
  text-align: center;
}
.genotype-chip .pct {
  font-size: 0.62rem;
  color: var(--accent2);
  font-weight: 700;
}

.parents-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
}
.parent-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}
.parent-card .label {
  font-size: 0.62rem;
  color: var(--text3);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 4px;
}
.parent-card .pheno {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
}
.parent-card .geno {
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 700;
}

.f1-box {
  background: linear-gradient(135deg, rgba(255,59,59,0.05), rgba(229,57,53,0.05));
  border: 1px solid rgba(255,59,59,0.22);
  border-radius: 12px;
  padding: 14px;
}
.f1-title {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.sol-section-label {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--gold);
  margin: 12px 0 6px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 5px;
}

.conclusion-box {
  background: rgba(76,175,80,0.08);
  border: 1px solid rgba(76,175,80,0.22);
  border-radius: 7px;
  padding: 7px 11px;
  font-size: 0.72rem;
  color: var(--success);
  margin-top: 9px;
  font-weight: 600;
}

.note-pill {
  display: inline-block;
  background: rgba(255,59,59,0.12);
  border: 1px solid rgba(255,59,59,0.28);
  border-radius: 7px;
  padding: 5px 11px;
  font-size: 0.72rem;
  color: var(--accent2);
  margin-top: 9px;
}

.separator {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 13px 0;
}

/* Toast */
.toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: var(--card2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 22px;
  font-weight: 700;
  font-size: 0.82rem;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error   { border-color: var(--danger);  color: var(--danger); }

/* Cycling animation */
@keyframes cycleFlash {
  0% { opacity: 0; transform: translateY(7px); }
  20% { opacity: 1; transform: translateY(0); }
  80% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-7px); }
}
.cycling-active { animation: cycleFlash 0.18s ease forwards; }
.new-q-btn.spinning { pointer-events:none; opacity:0.6; }

/* Responsive */
@media (max-width: 600px) {
  .topics-grid { grid-template-columns: 1fr; }
  .parents-row { grid-template-columns: 1fr; }
  .screen-title h2 { font-size: 1.2rem; }
  .welcome-main-title { font-size: 1.7rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Sound toggle button */
.sfx-toggle {
  position: fixed;
  bottom: 18px;
  left: 18px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text2);
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.sfx-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.1);
}
.sfx-toggle.muted {
  opacity: 0.5;
}