/* =========================================================
   互動特效動畫（由 js/components/fx.js 動態插入使用）
   ========================================================= */

.elvis-fx-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

/* ===== Combo 彈跳字 ===== */
.elvis-combo-pop {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--neon-gold);
  text-shadow: 0 0 16px rgba(255,209,102,0.8), 0 2px 4px rgba(0,0,0,0.5);
  transform: translate(-50%, -50%);
  animation: elvis-combo-anim 1.1s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  white-space: nowrap;
}
@keyframes elvis-combo-anim {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.3) rotate(-8deg); }
  20% { opacity: 1; transform: translate(-50%, -60%) scale(1.3) rotate(4deg); }
  35% { transform: translate(-50%, -60%) scale(1) rotate(0deg); }
  80% { opacity: 1; transform: translate(-50%, -90%) scale(1) rotate(0deg); }
  100% { opacity: 0; transform: translate(-50%, -110%) scale(0.9) rotate(0deg); }
}

/* ===== 飄浮 XP / 金幣獲得數字 ===== */
.elvis-float-gain {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 800;
  font-size: 1rem;
  transform: translate(-50%, 0);
  animation: elvis-float-up 1.3s ease-out forwards;
}
.elvis-float-gain svg { width: 18px; height: 18px; }
.elvis-float-gain--xp { color: #C4B5FF; }
.elvis-float-gain--coin { color: var(--neon-gold); }
@keyframes elvis-float-up {
  0% { opacity: 0; transform: translate(-50%, 0) scale(0.6); }
  15% { opacity: 1; transform: translate(-50%, -10px) scale(1.1); }
  100% { opacity: 0; transform: translate(-50%, -70px) scale(1); }
}

/* ===== 彩帶慶祝 ===== */
.elvis-confetti-piece {
  position: fixed;
  top: -20px;
  width: 10px;
  height: 14px;
  border-radius: 2px;
  animation: elvis-confetti-fall linear forwards;
}
@keyframes elvis-confetti-fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(540deg); opacity: 0; }
}

/* ===== 畫面震動（答錯用，基本版）===== */
.elvis-shake { animation: elvis-shake-anim 0.4s; }
@keyframes elvis-shake-anim {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

/* =========================================================
   答錯「雷劈」浮誇特效組（V02 新增）
   全螢幕白閃 + 紅色警示濾鏡 + 多道雷電劈落 + 整頁劇震
   ========================================================= */

/* 全螢幕白色閃光，模擬雷擊瞬間的曝光感 */
.elvis-strike-flash {
  position: fixed;
  inset: 0;
  background: #ffffff;
  opacity: 0;
  z-index: 1500;
  animation: elvis-strike-flash-anim 0.5s ease-out forwards;
  mix-blend-mode: screen;
}
@keyframes elvis-strike-flash-anim {
  0% { opacity: 0; }
  6% { opacity: 0.95; }
  18% { opacity: 0.15; }
  30% { opacity: 0.7; }
  45% { opacity: 0; }
  100% { opacity: 0; }
}

/* 紅色警示濾鏡，雷擊後的餘韻，四周泛紅提示答錯 */
.elvis-strike-vignette {
  position: fixed;
  inset: 0;
  z-index: 1490;
  pointer-events: none;
  box-shadow: inset 0 0 60px 20px rgba(255, 40, 60, 0);
  animation: elvis-strike-vignette-anim 0.65s ease-out forwards;
}
@keyframes elvis-strike-vignette-anim {
  0% { box-shadow: inset 0 0 0 0 rgba(255, 40, 60, 0); background: rgba(255,40,60,0); }
  15% { box-shadow: inset 0 0 120px 40px rgba(255, 40, 60, 0.55); background: rgba(255,40,60,0.12); }
  100% { box-shadow: inset 0 0 60px 20px rgba(255, 40, 60, 0); background: rgba(255,40,60,0); }
}

/* 雷電劈落主體，從畫面最上方劈到題目卡片附近 */
.elvis-strike-bolt {
  position: fixed;
  top: -10vh;
  width: 40px;
  height: 70vh;
  z-index: 1495;
  opacity: 0;
  filter: drop-shadow(0 0 14px rgba(0, 212, 255, 0.9)) drop-shadow(0 0 30px rgba(123, 92, 255, 0.7));
  animation: elvis-strike-bolt-anim 0.45s cubic-bezier(0.1, 0.9, 0.2, 1) forwards;
}
.elvis-strike-bolt svg { width: 100%; height: 100%; }
@keyframes elvis-strike-bolt-anim {
  0% { opacity: 0; transform: translateY(-20%) scaleY(0.3); }
  8% { opacity: 1; transform: translateY(0%) scaleY(1); }
  20% { opacity: 1; transform: translateY(2%) scaleY(1.02); }
  35% { opacity: 0.4; }
  50% { opacity: 0.9; }
  70% { opacity: 0.2; }
  100% { opacity: 0; }
}

/* 整個畫面（body）劇烈震動，比局部 shake 幅度更大更浮誇 */
.elvis-screen-shake { animation: elvis-screen-shake-anim 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97); }
@keyframes elvis-screen-shake-anim {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  10% { transform: translate(-10px, 4px) rotate(-0.6deg); }
  20% { transform: translate(9px, -5px) rotate(0.6deg); }
  30% { transform: translate(-8px, 3px) rotate(-0.5deg); }
  40% { transform: translate(8px, -4px) rotate(0.5deg); }
  50% { transform: translate(-6px, 3px) rotate(-0.3deg); }
  60% { transform: translate(6px, -2px) rotate(0.3deg); }
  70% { transform: translate(-4px, 2px) rotate(-0.2deg); }
  80% { transform: translate(3px, -1px) rotate(0.1deg); }
  90% { transform: translate(-2px, 1px) rotate(0deg); }
}

/* 題目卡片雷擊震動＋紅色描邊爆閃 */
.elvis-shake-hard {
  animation: elvis-shake-hard-anim 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}
@keyframes elvis-shake-hard-anim {
  0% { transform: scale(1) translateX(0); box-shadow: 0 0 0 0 rgba(255,40,60,0); border-color: var(--border-soft); }
  10% { transform: scale(1.02) translateX(-14px); box-shadow: 0 0 40px 8px rgba(255,40,60,0.8); border-color: #FF2C3C; }
  25% { transform: scale(1.02) translateX(12px); }
  40% { transform: scale(1.01) translateX(-9px); }
  55% { transform: scale(1.01) translateX(7px); }
  70% { transform: scale(1) translateX(-4px); box-shadow: 0 0 20px 4px rgba(255,40,60,0.4); }
  85% { transform: scale(1) translateX(2px); }
  100% { transform: scale(1) translateX(0); box-shadow: 0 0 0 0 rgba(255,40,60,0); border-color: var(--border-soft); }
}

/* ===== Toast ===== */
.elvis-toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 20px);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-soft);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), opacity 0.3s;
  box-shadow: var(--shadow-card);
  pointer-events: auto;
  z-index: 1000;
}
.elvis-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.elvis-toast--success { border-color: var(--neon-green); color: var(--neon-green); }
.elvis-toast--error { border-color: var(--neon-red); color: var(--neon-red); }
.elvis-toast--info { border-color: var(--neon-cyan); color: var(--neon-cyan); }

/* ===== 升級橫幅 ===== */
.elvis-levelup-banner {
  position: fixed;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: linear-gradient(135deg, var(--bg-surface-2), var(--bg-surface-3));
  border: 2px solid var(--neon-gold);
  box-shadow: var(--glow-gold), var(--shadow-card);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1), opacity 0.4s;
  z-index: 1001;
}
.elvis-levelup-banner.is-visible { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.elvis-levelup-banner svg { width: 48px; height: 48px; color: var(--neon-gold); }
.elvis-levelup-banner strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--neon-gold);
}
.elvis-levelup-banner span { color: var(--text-secondary); font-size: 0.9rem; }

/* V08新增：解鎖新 AI 對手提示，沿用升級橫幅結構，改用紫色系與升級橫幅（金色）區分，
   避免玩家把「解鎖對手」誤看成「升級」。 */
.elvis-levelup-banner--ai-unlock {
  top: 52%;
  border-color: var(--neon-purple);
  box-shadow: 0 0 24px rgba(167, 139, 250, 0.45), var(--shadow-card);
}
.elvis-levelup-banner--ai-unlock svg { color: #C4B5FF; }
.elvis-levelup-banner--ai-unlock strong { color: #C4B5FF; }

/* ===== 進場浮現動畫（頁面/卡片通用）===== */
.elvis-fade-up {
  animation: elvis-fade-up-anim 0.6s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}
@keyframes elvis-fade-up-anim {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}