:root {
  --navy: #0a0a2e;
  --navy-light: #141452;
  --navy-mid: #1a1a5e;
  --gold: #ffd700;
  --gold-dim: #c5a200;
  --orange: #ff6b35;
  --orange-glow: #ff8c5a;
  --white: #f0f0ff;
  --correct: #00e676;
  --wrong: #ff1744;
  --font-title: 'Dela Gothic One', sans-serif;
  --font-body: 'Zen Maru Gothic', 'M PLUS Rounded 1c', sans-serif;
}

html, body {
  width: 100%;
  min-height: 100dvh;
  overflow-x: hidden;
  font-family: var(--font-body);
  background: var(--navy);
  color: var(--white);
}

/* ===== BACK LINK ===== */
.back-to-top-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  color: var(--gold);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  background: rgba(10, 10, 46, 0.85);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255, 215, 0, 0.3);
  backdrop-filter: blur(6px);
  transition: all 0.3s;
}
.back-to-top-link:hover {
  background: rgba(255, 215, 0, 0.15);
  border-color: var(--gold);
}

/* ===== BACKGROUND EFFECTS ===== */
.bg-spotlights {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.spotlight {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  animation: spotlightPulse 6s ease-in-out infinite alternate;
}
.spotlight.s1 {
  width: 400px; height: 400px;
  background: var(--gold);
  top: -100px; left: -100px;
  animation-delay: 0s;
}
.spotlight.s2 {
  width: 300px; height: 300px;
  background: var(--orange);
  bottom: -80px; right: -80px;
  animation-delay: 2s;
}
.spotlight.s3 {
  width: 250px; height: 250px;
  background: #6a5acd;
  top: 40%; left: 60%;
  animation-delay: 4s;
}

@keyframes spotlightPulse {
  0% { opacity: 0.08; transform: scale(1); }
  100% { opacity: 0.2; transform: scale(1.3); }
}

.bg-particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-size: 1rem;
  opacity: 0;
  animation: particleFloat var(--dur) var(--delay) ease-in-out infinite;
  color: var(--gold);
}

@keyframes particleFloat {
  0%, 100% { opacity: 0; transform: translateY(0) scale(0.8); }
  50% { opacity: 0.6; transform: translateY(-30px) scale(1.1); }
}

/* ===== FLASH OVERLAY ===== */
.flash-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}
.flash-overlay.flash-correct {
  background: radial-gradient(circle, rgba(0,230,118,0.3), transparent 70%);
  opacity: 1;
}
.flash-overlay.flash-wrong {
  background: radial-gradient(circle, rgba(255,23,68,0.3), transparent 70%);
  opacity: 1;
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  padding: 20px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.screen.active {
  display: flex;
}

/* ===== TITLE SCREEN ===== */
.title-container {
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}

.title-crown {
  font-size: 4rem;
  animation: crownBounce 2s ease-in-out infinite;
  filter: drop-shadow(0 0 20px rgba(255, 215, 0, 0.6));
}

@keyframes crownBounce {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-12px) rotate(3deg); }
}

.title-main {
  font-family: var(--font-title);
  font-size: clamp(2.2rem, 8vw, 4rem);
  color: var(--gold);
  text-shadow:
    0 0 20px rgba(255, 215, 0, 0.5),
    0 0 60px rgba(255, 215, 0, 0.2),
    0 4px 0 var(--gold-dim);
  line-height: 1.3;
  margin: 10px 0 8px;
}

.title-subtitle {
  font-size: clamp(1rem, 3.5vw, 1.4rem);
  color: var(--orange);
  font-weight: 700;
  text-shadow: 0 0 15px rgba(255, 107, 53, 0.4);
  margin-bottom: 30px;
}

.title-rules {
  background: rgba(255, 215, 0, 0.08);
  border: 1px solid rgba(255, 215, 0, 0.2);
  border-radius: 16px;
  padding: 18px 24px;
  margin-bottom: 30px;
  text-align: left;
  display: inline-block;
}
.title-rules p {
  font-size: 0.95rem;
  margin: 6px 0;
  color: rgba(240, 240, 255, 0.85);
}

.btn-start {
  font-family: var(--font-title);
  font-size: clamp(1.2rem, 4vw, 1.6rem);
  color: var(--navy);
  background: linear-gradient(135deg, var(--gold), var(--orange));
  border: none;
  border-radius: 50px;
  padding: 16px 50px;
  cursor: pointer;
  box-shadow:
    0 4px 20px rgba(255, 215, 0, 0.4),
    0 0 40px rgba(255, 215, 0, 0.15);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.btn-start::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 52px;
  background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn-start:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow:
    0 8px 30px rgba(255, 215, 0, 0.5),
    0 0 60px rgba(255, 215, 0, 0.25);
}
.btn-start:hover::after { opacity: 1; }
.btn-start:active { transform: translateY(0) scale(0.98); }

/* ===== DISCLAIMER ===== */
.disclaimer {
  position: absolute;
  bottom: 12px;
  left: 64px;
  right: 64px;
  text-align: center;
  font-size: 0.7rem;
  color: rgba(240, 240, 255, 0.35);
  line-height: 1.5;
}

/* ===== GAME HUD ===== */
.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
  max-width: 600px;
  padding: 10px 0;
  margin-top: 50px;
}
.hud-label {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(255, 215, 0, 0.6);
  text-transform: uppercase;
}
.hud-value {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--gold);
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}
.hud-center {
  text-align: center;
}
.question-number {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--white);
}
.category-label {
  font-size: 0.8rem;
  color: var(--orange);
  font-weight: 700;
  margin-top: 2px;
  background: rgba(255, 107, 53, 0.15);
  padding: 2px 12px;
  border-radius: 10px;
  display: inline-block;
}
.hud-right {
  text-align: right;
}
.multiplier {
  font-family: var(--font-title);
  font-size: 0.85rem;
  color: var(--orange);
  opacity: 0.5;
  transition: all 0.3s;
}
.multiplier.active {
  opacity: 1;
  color: var(--orange);
  text-shadow: 0 0 10px rgba(255, 107, 53, 0.5);
  animation: multiplierPop 0.4s ease-out;
}

@keyframes multiplierPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.5); }
  100% { transform: scale(1); }
}

/* Streak fire */
.streak-fire {
  display: inline-block;
  margin-left: 4px;
  font-size: 1.2rem;
  opacity: 0;
  transition: opacity 0.3s;
}
.streak-fire.on {
  opacity: 1;
  animation: fireFlicker 0.3s ease-in-out infinite alternate;
}

@keyframes fireFlicker {
  0% { transform: scale(1) rotate(-5deg); filter: brightness(1); }
  100% { transform: scale(1.15) rotate(5deg); filter: brightness(1.3); }
}

/* ===== TIMER BAR ===== */
.timer-bar-container {
  width: 100%;
  max-width: 600px;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  margin: 12px 0;
  overflow: hidden;
}
.timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--gold), var(--orange));
  border-radius: 3px;
  transition: width linear;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.4);
}
.timer-bar.urgent {
  background: linear-gradient(90deg, var(--wrong), var(--orange));
  animation: timerPulse 0.5s ease-in-out infinite;
}

@keyframes timerPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(255, 23, 68, 0.4); }
  50% { box-shadow: 0 0 20px rgba(255, 23, 68, 0.8); }
}

/* ===== QUESTION AREA ===== */
.question-area {
  width: 100%;
  max-width: 600px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 215, 0, 0.15);
  border-radius: 20px;
  padding: 28px 24px;
  margin: 16px 0;
  text-align: center;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.question-text {
  font-size: clamp(1.1rem, 3.5vw, 1.4rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--white);
}

/* ===== ANSWER BUTTONS ===== */
.answers-area {
  width: 100%;
  max-width: 600px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0;
}

.btn-answer {
  font-family: var(--font-body);
  font-size: clamp(0.9rem, 2.8vw, 1.1rem);
  font-weight: 700;
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
  border: 2px solid rgba(255, 215, 0, 0.2);
  border-radius: 14px;
  padding: 16px 12px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
  min-height: 60px;
  word-break: break-all;
}
.btn-answer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,215,0,0.1), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}
.btn-answer:hover:not(:disabled) {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
}
.btn-answer:hover:not(:disabled)::before { opacity: 1; }
.btn-answer:active:not(:disabled) {
  transform: translateY(0) scale(0.97);
}

.btn-answer.correct {
  border-color: var(--correct) !important;
  background: rgba(0, 230, 118, 0.2) !important;
  box-shadow: 0 0 25px rgba(0, 230, 118, 0.3);
  animation: correctPulse 0.5s ease-out;
}
.btn-answer.wrong {
  border-color: var(--wrong) !important;
  background: rgba(255, 23, 68, 0.2) !important;
  box-shadow: 0 0 25px rgba(255, 23, 68, 0.3);
  animation: wrongShake 0.4s ease-out;
}
.btn-answer:disabled {
  cursor: default;
  opacity: 0.5;
}
.btn-answer.correct:disabled,
.btn-answer.wrong:disabled {
  opacity: 1;
}

@keyframes correctPulse {
  0% { transform: scale(1); }
  30% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* ===== EXPLANATION AREA ===== */
.explanation-area {
  width: 100%;
  max-width: 600px;
  background: rgba(255, 215, 0, 0.06);
  border: 1px solid rgba(255, 215, 0, 0.2);
  border-radius: 14px;
  padding: 16px 20px;
  margin-top: 12px;
  text-align: center;
  animation: fadeInUp 0.4s ease-out;
}
.explanation-area.hidden { display: none; }
.explanation-icon {
  font-size: 1.5rem;
  margin-bottom: 6px;
}
.explanation-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(240, 240, 255, 0.85);
}

/* ===== RESULT SCREEN ===== */
.result-container {
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}
.result-crown {
  font-size: 5rem;
  margin-bottom: 10px;
  animation: crownBounce 2s ease-in-out infinite;
  filter: drop-shadow(0 0 30px rgba(255, 215, 0, 0.6));
}
.result-rank {
  font-family: var(--font-title);
  font-size: clamp(1.8rem, 7vw, 3rem);
  color: var(--gold);
  text-shadow:
    0 0 20px rgba(255, 215, 0, 0.5),
    0 0 60px rgba(255, 215, 0, 0.2);
  margin-bottom: 16px;
}
.result-score {
  font-family: var(--font-title);
  font-size: clamp(3rem, 10vw, 5rem);
  color: var(--white);
  text-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
  line-height: 1;
}
.result-label {
  font-size: 0.9rem;
  color: rgba(255, 215, 0, 0.6);
  margin-bottom: 24px;
  letter-spacing: 0.2em;
}
.result-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}
.stat-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 215, 0, 0.15);
  border-radius: 14px;
  padding: 14px 20px;
  min-width: 90px;
}
.stat-value {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--gold);
}
.stat-label {
  font-size: 0.75rem;
  color: rgba(240, 240, 255, 0.6);
  margin-top: 4px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  0% { opacity: 0; transform: translateY(30px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes resultCountUp {
  0% { transform: scale(0.5); opacity: 0; }
  60% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

@media (min-width: 700px) {
  #title-screen.active,
  #result-screen.active {
    justify-content: flex-start;
    padding-top: clamp(88px, 10vh, 128px);
  }

  .title-container,
  .result-container {
    width: min(100%, 760px);
  }

  .title-main {
    font-size: clamp(2.8rem, 7vw, 4.5rem);
  }

  .title-subtitle {
    font-size: 1.45rem;
    margin-bottom: 34px;
  }

  .title-rules {
    width: min(100%, 440px);
    padding: 20px 26px;
    margin-bottom: 34px;
  }

  .title-rules p {
    font-size: 1rem;
  }

  .btn-start {
    padding: 18px 56px;
  }

  .game-hud,
  .timer-bar-container,
  .question-area,
  .answers-area,
  .explanation-area {
    max-width: 680px;
  }

  .game-hud {
    margin-top: 56px;
  }

  .question-area {
    min-height: 136px;
    padding: 32px 30px;
  }

  .question-text {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  }

  .answers-area {
    gap: 14px;
  }

  .btn-answer {
    min-height: 72px;
    padding: 18px 16px;
  }

  .result-stats {
    gap: 22px;
  }

  .disclaimer {
    left: 88px;
    right: 88px;
    font-size: 0.72rem;
  }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  #title-screen.active,
  #result-screen.active {
    justify-content: flex-start;
    padding: 74px 16px 24px;
  }

  .title-container,
  .result-container {
    width: min(100%, 348px);
    padding: 24px 18px 20px;
    border-radius: 24px;
    background: rgba(20, 20, 82, 0.42);
    border: 1px solid rgba(255, 215, 0, 0.16);
    box-shadow: 0 20px 46px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(12px);
  }

  .title-main {
    font-size: clamp(1.85rem, 8.6vw, 2.55rem);
    margin: 8px 0 10px;
  }

  .title-subtitle {
    margin-bottom: 20px;
  }

  .title-rules {
    padding: 14px 16px;
    margin-bottom: 22px;
  }

  .title-rules p {
    font-size: 0.88rem;
  }

  .btn-start {
    width: 100%;
    padding: 15px 20px;
    font-size: 1.05rem;
  }

  .disclaimer {
    position: static;
    left: auto;
    right: auto;
    max-width: 330px;
    margin: 18px auto 0;
    padding: 0 6px;
    font-size: 0.68rem;
  }

  .answers-area {
    grid-template-columns: 1fr;
  }
  .btn-answer {
    min-height: 50px;
    padding: 14px 12px;
  }
  .game-hud {
    margin-top: 45px;
  }
  .result-stats {
    gap: 12px;
  }
  .stat-item {
    padding: 10px 14px;
    min-width: 80px;
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  .game-hud {
    margin-top: 48px;
  }
}