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

:root {
  --bg: #0f0e17;
  --surface: #1a1932;
  --accent1: #7f5af0;
  --accent2: #2cb67d;
  --accent3: #e16162;
  --accent4: #f7b731;
  --text: #fffffe;
  --text-dim: #94a1b2;
  --correct: #2cb67d;
  --wrong: #e16162;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

.screen { display: none; position: absolute; inset: 0; flex-direction: column; align-items: center; justify-content: center; }
.screen.active { display: flex; }

/* PARTICLES */
.particles-canvas { position: fixed; inset: 0; pointer-events: none; z-index: 0; }

/* SPLASH */
#splash { z-index: 10; }
.splash-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(127,90,240,0.25) 0%, transparent 70%),
              radial-gradient(ellipse at 80% 80%, rgba(44,182,125,0.15) 0%, transparent 60%);
}
.splash-content { position: relative; z-index: 1; text-align: center; padding: 2rem; }
.logo { margin-bottom: 1rem; }
.dice { font-size: 4rem; display: block; animation: float 3s ease-in-out infinite; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
h1 {
  font-size: 3.5rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tagline { color: var(--text-dim); font-size: 1.2rem; margin-bottom: 2rem; }

.mode-toggle { display: flex; gap: 0.5rem; justify-content: center; margin-bottom: 1.5rem; }
.mode-btn {
  background: var(--surface); border: 2px solid transparent; color: var(--text-dim);
  padding: 0.6rem 1.2rem; border-radius: 2rem; cursor: pointer; font-size: 1rem; transition: all 0.3s;
}
.mode-btn.selected { border-color: var(--accent1); color: var(--text); background: rgba(127,90,240,0.2); }
.mode-btn:hover { border-color: var(--accent1); }

.btn-play {
  background: linear-gradient(135deg, var(--accent1), #6442d0);
  border: none; color: white; padding: 1rem 3rem; border-radius: 3rem;
  font-size: 1.3rem; font-weight: 700; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px rgba(127,90,240,0.4);
}
.btn-play:hover { transform: scale(1.05); box-shadow: 0 6px 32px rgba(127,90,240,0.6); }
.btn-play:active { transform: scale(0.97); }

/* GAME */
#game { z-index: 10; padding: 1rem; justify-content: flex-start; padding-top: 1.5rem; }
.game-header { width: 100%; max-width: 700px; }
.progress-bar { width: 100%; height: 6px; background: var(--surface); border-radius: 3px; overflow: hidden; margin-bottom: 0.75rem; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent1), var(--accent2)); transition: width 0.5s ease; width: 0%; }
.round-info { display: flex; align-items: center; gap: 0.75rem; font-size: 0.9rem; color: var(--text-dim); margin-bottom: 0.5rem; flex-wrap: wrap; }
.category-tag {
  background: rgba(127,90,240,0.2); color: var(--accent1); padding: 0.2rem 0.75rem;
  border-radius: 1rem; font-size: 0.8rem; font-weight: 600;
}
.score-label { margin-left: auto; font-weight: 600; color: var(--accent4); }

/* TIMER */
.timer-bar { width: 100%; height: 4px; background: var(--surface); border-radius: 2px; margin-bottom: 0.5rem; position: relative; }
.timer-fill { height: 100%; background: var(--accent4); border-radius: 2px; transition: width 0.1s linear; width: 100%; }
.timer-text { position: absolute; right: 0; top: 8px; font-size: 0.85rem; font-weight: 700; color: var(--accent4); }
.timer-bar.danger .timer-fill { background: var(--accent3); }
.timer-bar.danger .timer-text { color: var(--accent3); }
.hidden { display: none !important; }

/* QUESTION */
.question-area { max-width: 700px; width: 100%; text-align: center; margin: 2rem 0 1.5rem; flex-shrink: 0; }
.question-text { font-size: 1.4rem; font-weight: 600; line-height: 1.4; min-height: 3em; }

/* OPTIONS */
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; max-width: 700px; width: 100%; }
.option-btn {
  background: var(--surface); border: 2px solid rgba(255,255,255,0.08);
  border-radius: 1rem; padding: 1.2rem 1rem; cursor: pointer;
  display: flex; align-items: center; gap: 0.75rem;
  transition: all 0.25s; color: var(--text); font-size: 1.05rem;
  position: relative; overflow: hidden;
}
.option-btn:hover:not(.disabled) { border-color: var(--accent1); transform: translateY(-2px); box-shadow: 0 4px 20px rgba(127,90,240,0.2); }
.option-btn:active:not(.disabled) { transform: scale(0.97); }
.option-letter {
  width: 2.2rem; height: 2.2rem; border-radius: 50%;
  background: rgba(127,90,240,0.2); color: var(--accent1);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.95rem; flex-shrink: 0;
}
.option-text { font-weight: 600; }
.option-btn.correct { border-color: var(--correct); background: rgba(44,182,125,0.15); animation: pulse-correct 0.5s; }
.option-btn.correct .option-letter { background: var(--correct); color: white; }
.option-btn.wrong { border-color: var(--wrong); background: rgba(225,97,98,0.15); animation: shake 0.4s; }
.option-btn.wrong .option-letter { background: var(--wrong); color: white; }
.option-btn.disabled { pointer-events: none; opacity: 0.5; }
.option-btn.correct.disabled { opacity: 1; }

@keyframes pulse-correct { 0%{transform:scale(1)} 50%{transform:scale(1.03)} 100%{transform:scale(1)} }
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-8px)} 40%{transform:translateX(8px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(4px)} }

/* RESULT PANEL */
.result-panel {
  max-width: 700px; width: 100%; text-align: center; margin-top: 1.5rem;
  animation: fadeUp 0.4s ease;
}
.result-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.result-answer { font-size: 1.5rem; font-weight: 800; margin-bottom: 0.5rem; }
.result-answer.correct-text { color: var(--correct); }
.result-answer.wrong-text { color: var(--wrong); }
.result-fact { color: var(--text-dim); font-size: 0.95rem; line-height: 1.5; max-width: 500px; margin: 0 auto; }
@keyframes fadeUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }

/* FINAL */
#final { z-index: 10; }
.final-content { text-align: center; position: relative; z-index: 1; padding: 2rem; }
#final-score { font-size: 3rem; font-weight: 800; margin-bottom: 0.5rem; }
.final-rating { font-size: 1.5rem; color: var(--accent1); margin-bottom: 1rem; font-weight: 600; }
.final-stars { font-size: 2rem; margin-bottom: 2rem; letter-spacing: 0.3rem; }
.btn-home {
  background: transparent; border: 2px solid var(--text-dim); color: var(--text-dim);
  padding: 0.8rem 2rem; border-radius: 3rem; font-size: 1rem; cursor: pointer;
  margin-left: 1rem; transition: all 0.3s;
}
.btn-home:hover { border-color: var(--text); color: var(--text); }

/* EXIT BUTTON */
.btn-exit { position: absolute; top: 12px; right: 16px; background: rgba(255,255,255,0.1); border: 2px solid rgba(255,255,255,0.2); color: #aaa; width: 36px; height: 36px; border-radius: 50%; font-size: 1.1rem; cursor: pointer; transition: background 0.2s, color 0.2s; z-index: 20; font-family: inherit; }
.btn-exit:hover { background: rgba(239,68,68,0.3); border-color: #ef4444; color: #fff; }

/* NEXT BUTTON */
.btn-next { display: inline-block; margin-top: 1.2rem; padding: 0.75rem 2rem; background: linear-gradient(135deg, #7c3aed, #a78bfa); color: #fff; border: none; border-radius: 12px; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: transform 0.15s, filter 0.2s; font-family: inherit; }
.btn-next:hover { transform: scale(1.05); filter: brightness(1.15); }

/* CONFETTI */
.confetti-container { position: absolute; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.confetti-piece {
  position: absolute; width: 10px; height: 10px; top: -20px;
  animation: confetti-fall linear forwards;
}
@keyframes confetti-fall {
  to { transform: translateY(110vh) rotate(720deg); opacity: 0; }
}

/* RESPONSIVE */
@media (max-width: 600px) {
  h1 { font-size: 2.5rem; }
  .question-text { font-size: 1.15rem; }
  .options { grid-template-columns: 1fr; gap: 0.75rem; }
  .option-btn { padding: 1rem; min-height: 48px; }
  #game { padding: 1rem 0.75rem; }
  .btn-play { min-height: 48px; }
  .btn-next { min-height: 48px; }
  .mode-btn { min-height: 44px; }
  #final-score { font-size: 2.2rem; }
}