:root {
  --green-dark: #0a3d0a;
  --green-mid: #16a34a;
  --green-light: #22c55e;
  --orange: #f97316;
  --orange-glow: #fb923c;
  --white: #f0fff0;
  --correct: #22c55e;
  --wrong: #ef4444;
  --font-title: 'Dela Gothic One', sans-serif;
  --font-body: 'Zen Maru Gothic', sans-serif;
}

html, body {
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  font-family: var(--font-body);
  background: linear-gradient(180deg, #0a1e0a 0%, #0d2818 50%, #0a1a0a 100%);
  color: var(--white);
}

/* ===== BACK LINK ===== */
.back-to-top-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  color: var(--green-light);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  background: rgba(10, 30, 10, 0.85);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(34, 197, 94, 0.3);
  backdrop-filter: blur(6px);
  transition: all 0.3s;
}
.back-to-top-link:hover {
  background: rgba(34, 197, 94, 0.15);
  border-color: var(--green-light);
}

/* ===== BACKGROUND SHAMROCKS ===== */
.bg-shamrocks {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.shamrock {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-size: 1.2rem;
  opacity: 0;
  animation: shamrockFloat var(--dur) var(--delay) ease-in-out infinite;
}

@keyframes shamrockFloat {
  0%, 100% { opacity: 0; transform: translateY(0) rotate(0deg) scale(0.8); }
  50% { opacity: 0.2; transform: translateY(-20px) rotate(15deg) 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(34,197,94,0.3), transparent 70%);
  opacity: 1;
}
.flash-overlay.flash-wrong {
  background: radial-gradient(circle, rgba(239,68,68,0.3), transparent 70%);
  opacity: 1;
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  position: relative;
  z-index: 1;
  height: 100dvh;
  padding: 16px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.screen.active {
  display: flex;
}

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

.title-icon {
  font-size: 4rem;
  animation: flagWave 2s ease-in-out infinite;
}

@keyframes flagWave {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-10px) rotate(3deg); }
}

.title-main {
  font-family: var(--font-title);
  font-size: clamp(2.2rem, 8vw, 4rem);
  color: var(--green-light);
  text-shadow:
    0 0 20px rgba(34, 197, 94, 0.5),
    0 0 60px rgba(34, 197, 94, 0.2),
    0 4px 0 #15803d;
  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(249, 115, 22, 0.4);
  margin-bottom: 30px;
}

.title-rules {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 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, 255, 240, 0.85);
}

.btn-start {
  font-family: var(--font-title);
  font-size: clamp(1.2rem, 4vw, 1.6rem);
  color: #0a1e0a;
  background: linear-gradient(135deg, var(--green-light), var(--orange));
  border: none;
  border-radius: 50px;
  padding: 16px 50px;
  cursor: pointer;
  box-shadow:
    0 4px 20px rgba(34, 197, 94, 0.4),
    0 0 40px rgba(34, 197, 94, 0.15);
  transition: all 0.3s;
}
.btn-start:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow:
    0 8px 30px rgba(34, 197, 94, 0.5),
    0 0 60px rgba(34, 197, 94, 0.25);
}
.btn-start:active { transform: translateY(0) scale(0.98); }

/* ===== GAME HUD ===== */
.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: 100%;
  max-width: 600px;
  padding: 6px 0;
  margin-top: 40px;
  flex-shrink: 0;
}
.hud-label {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: rgba(34, 197, 94, 0.6);
  text-transform: uppercase;
}
.hud-value {
  font-family: var(--font-title);
  font-size: 1.4rem;
  color: var(--green-light);
  text-shadow: 0 0 10px rgba(34, 197, 94, 0.3);
}
.hud-center { text-align: center; }
.round-number {
  font-family: var(--font-title);
  font-size: 0.9rem;
  color: var(--white);
}
.round-type {
  font-size: 0.75rem;
  color: var(--orange);
  font-weight: 700;
  margin-top: 2px;
  background: rgba(249, 115, 22, 0.15);
  padding: 2px 10px;
  border-radius: 10px;
  display: inline-block;
}
.hud-right { text-align: right; }

.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); }
  100% { transform: scale(1.15) rotate(5deg); }
}

/* ===== TIMER BAR ===== */
.timer-bar-container {
  width: 100%;
  max-width: 600px;
  height: 5px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  margin: 6px 0;
  overflow: hidden;
  flex-shrink: 0;
}
.timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--green-light), var(--orange));
  border-radius: 3px;
  transition: width linear;
  box-shadow: 0 0 10px rgba(34, 197, 94, 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(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 20px rgba(239, 68, 68, 0.8); }
}

/* ===== QUESTION AREA ===== */
.question-area {
  width: 100%;
  max-width: 600px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: 14px;
  padding: 10px 16px;
  margin: 6px 0;
  text-align: center;
  flex-shrink: 0;
}
.question-text {
  font-size: clamp(0.95rem, 3vw, 1.2rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

/* ====================================================
   SCATTER FIELD - ウォーリーを探せ風のカオスなフィールド
   ==================================================== */
.field-area {
  position: relative;
  width: 100%;
  max-width: 600px;
  flex: 1;
  min-height: 0;
  margin: 6px 0;
  border-radius: 16px;
  background:
    radial-gradient(ellipse at 30% 40%, rgba(34, 197, 94, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 60%, rgba(249, 115, 22, 0.04) 0%, transparent 60%),
    rgba(5, 15, 5, 0.6);
  border: 1px solid rgba(34, 197, 94, 0.12);
  overflow: hidden;
}

/* ===== SCATTERED ITEMS ===== */
.scatter-item {
  position: absolute;
  cursor: pointer;
  border: none;
  background: none;
  color: var(--white);
  font-family: var(--font-body);
  font-weight: 700;
  padding: 4px 8px;
  white-space: nowrap;
  transition: opacity 0.4s, box-shadow 0.3s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.scatter-item:hover:not(:disabled) {
  text-shadow: 0 0 12px rgba(34, 197, 94, 0.8);
}

/* Text items */
.scatter-text {
  font-size: 1rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
  letter-spacing: 0.02em;
}

/* Flag items */
.scatter-flag {
  padding: 3px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.3);
}
.scatter-flag .flag-display {
  width: 60px;
  height: 36px;
  border-radius: 3px;
  overflow: hidden;
  display: flex;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.flag-display .stripe {
  flex: 1;
  height: 100%;
}

/* Shape items */
.scatter-shape {
  padding: 2px;
}
.scatter-shape svg {
  width: 55px;
  height: 55px;
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.5));
}

/* ===== FOUND / WRONG states ===== */
.scatter-item.found {
  box-shadow:
    0 0 20px rgba(34, 197, 94, 0.8),
    0 0 40px rgba(34, 197, 94, 0.4);
  background: rgba(34, 197, 94, 0.15);
  border-radius: 8px;
  animation: foundPulse 0.6s ease-out;
}
.scatter-text.found {
  color: var(--green-light);
  text-shadow: 0 0 15px rgba(34, 197, 94, 0.9);
}
.scatter-flag.found {
  border: 2px solid var(--green-light);
}

.scatter-item.wrong {
  box-shadow:
    0 0 20px rgba(239, 68, 68, 0.8),
    0 0 40px rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.15);
  border-radius: 8px;
  animation: wrongShake 0.4s ease-out;
}
.scatter-text.wrong {
  color: var(--wrong);
}

@keyframes foundPulse {
  0% { transform: rotate(0deg) scale(1); }
  30% { transform: rotate(0deg) scale(1.5); }
  100% { transform: rotate(0deg) scale(1.3); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

@keyframes popIn {
  0% { opacity: 0; transform: scale(0) rotate(var(--r, 0deg)); }
  70% { opacity: 1; transform: scale(1.1); }
  100% { opacity: 1; }
}

/* ===== FEEDBACK AREA ===== */
.feedback-area {
  width: 100%;
  max-width: 600px;
  background: rgba(34, 197, 94, 0.06);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 12px;
  padding: 10px 16px;
  text-align: center;
  animation: fadeInUp 0.4s ease-out;
  flex-shrink: 0;
}
.feedback-area.hidden { display: none; }
.feedback-icon {
  font-size: 1.3rem;
  margin-bottom: 2px;
}
.feedback-text {
  font-size: 0.8rem;
  line-height: 1.4;
  color: rgba(240, 255, 240, 0.85);
}

/* ===== RESULT SCREEN ===== */
.result-container {
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}
.result-icon {
  font-size: 5rem;
  margin-bottom: 10px;
  animation: flagWave 2s ease-in-out infinite;
}
.result-rank {
  font-family: var(--font-title);
  font-size: clamp(1.6rem, 6vw, 2.5rem);
  color: var(--green-light);
  text-shadow:
    0 0 20px rgba(34, 197, 94, 0.5),
    0 0 60px rgba(34, 197, 94, 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(34, 197, 94, 0.3);
  line-height: 1;
}
.result-label {
  font-size: 0.9rem;
  color: rgba(34, 197, 94, 0.6);
  margin-bottom: 24px;
  letter-spacing: 0.2em;
}
.result-stats {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}
.stat-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: 14px;
  padding: 14px 20px;
  min-width: 90px;
}
.stat-value {
  font-family: var(--font-title);
  font-size: 1.6rem;
  color: var(--green-light);
}
.stat-label {
  font-size: 0.75rem;
  color: rgba(240, 255, 240, 0.6);
  margin-top: 4px;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .game-hud { margin-top: 38px; }
  .scatter-flag .flag-display {
    width: 50px;
    height: 30px;
  }
  .scatter-shape svg {
    width: 45px;
    height: 45px;
  }
  .result-stats { gap: 10px; }
  .stat-item { padding: 10px 14px; min-width: 80px; }
}
@media (min-width: 700px) {
  #title-screen,
  #result-screen {
    justify-content: flex-start;
    padding-top: clamp(104px, 10vw, 150px);
  }

  .title-container,
  .result-container {
    max-width: 720px;
  }

  .title-main {
    font-size: clamp(3.4rem, 5vw, 4.8rem);
  }

  .title-subtitle {
    font-size: 1.25rem;
    margin-bottom: 24px;
  }

  .title-rules {
    max-width: 440px;
    padding: 22px 28px;
    margin-bottom: 24px;
  }

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

  .btn-start {
    min-width: 240px;
    padding: 18px 54px;
  }

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

  .field-area {
    min-height: 460px;
  }
}

@media (min-width: 1100px) {
  #title-screen,
  #result-screen {
    padding-top: 132px;
  }

  .field-area {
    min-height: 500px;
  }
}