.turn-transition-effect {
    --turn-accent: #67e8f9;
    position: fixed;
    inset: 0;
    z-index: 2100;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    animation: turnTransitionFade 1080ms ease-out forwards;
}

.turn-transition-vignette {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.12), transparent 24%),
        radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--turn-accent) 28%, transparent), transparent 46%),
        rgba(2, 6, 23, 0.54);
    animation: turnTransitionVignette 1080ms ease-out forwards;
}

.turn-transition-line {
    position: absolute;
    left: -18vw;
    width: 136vw;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--turn-accent), #ffffff, var(--turn-accent), transparent);
    box-shadow:
        0 0 18px var(--turn-accent),
        0 0 34px color-mix(in srgb, var(--turn-accent) 80%, transparent);
    opacity: 0;
    transform: rotate(-7deg) translateX(-28vw);
    animation: turnTransitionLine 880ms cubic-bezier(0.2, 0.86, 0.26, 1) forwards;
}

.turn-transition-line.secondary {
    height: 2px;
    transform: rotate(7deg) translateX(28vw);
    animation-name: turnTransitionLineReverse;
    animation-delay: 90ms;
}

.turn-transition-content {
    position: relative;
    min-width: min(680px, 92vw);
    padding: 28px 36px;
    text-align: center;
    border-block: 2px solid color-mix(in srgb, var(--turn-accent) 84%, #ffffff 16%);
    background:
        linear-gradient(90deg, transparent, rgba(15, 23, 42, 0.86) 16% 84%, transparent),
        radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--turn-accent) 18%, transparent), transparent 62%);
    filter: drop-shadow(0 24px 42px rgba(0, 0, 0, 0.46));
    transform: scale(0.86);
    opacity: 0;
    animation: turnTransitionContent 1080ms cubic-bezier(0.18, 0.88, 0.28, 1) forwards;
}

.turn-transition-title {
    margin: 0;
    color: #ffffff;
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 900;
    line-height: 1;
    letter-spacing: 0;
    text-shadow:
        0 0 12px color-mix(in srgb, var(--turn-accent) 82%, transparent),
        0 4px 18px rgba(0, 0, 0, 0.76);
}

.turn-transition-subtitle {
    margin-top: 10px;
    color: color-mix(in srgb, var(--turn-accent) 72%, #ffffff 28%);
    font-size: 0.9rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.turn-transition-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--turn-accent);
    box-shadow: 0 0 14px var(--turn-accent);
    opacity: 0;
    animation: turnTransitionParticle 900ms ease-out forwards;
}

.turn-transition-player {
    --turn-accent: #34d399;
}

.turn-transition-opponent {
    --turn-accent: #fb7185;
}

.turn-transition-end {
    --turn-accent: #facc15;
}

.turn-transition-fusion {
    --turn-accent: #fb923c;
}

body.turn-transition-player #deck,
body.turn-transition-opponent #deck {
    animation: turnDeckPulse 1040ms ease-out;
}

body.turn-transition-fusion .place-rule-dot-orange.is-active,
body.turn-transition-fusion .place-rule-dot-orange.is-locked {
    animation: turnFusionPulse 1040ms ease-out;
}

body.turn-transition-player .player-area,
body.turn-transition-opponent .opponent-area {
    animation: turnAreaPulse 1040ms ease-out;
}

@keyframes turnTransitionFade {
    0% { opacity: 0; }
    12% { opacity: 1; }
    78% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes turnTransitionVignette {
    0% { opacity: 0; transform: scale(1.08); }
    22% { opacity: 1; transform: scale(1); }
    100% { opacity: 0; transform: scale(1.04); }
}

@keyframes turnTransitionLine {
    0% { opacity: 0; transform: rotate(-7deg) translateX(-32vw); }
    20% { opacity: 1; }
    74% { opacity: 1; }
    100% { opacity: 0; transform: rotate(-7deg) translateX(32vw); }
}

@keyframes turnTransitionLineReverse {
    0% { opacity: 0; transform: rotate(7deg) translateX(32vw); }
    20% { opacity: 1; }
    74% { opacity: 1; }
    100% { opacity: 0; transform: rotate(7deg) translateX(-32vw); }
}

@keyframes turnTransitionContent {
    0% { opacity: 0; transform: scale(0.82) translateY(18px); }
    18% { opacity: 1; transform: scale(1.08) translateY(0); }
    34% { transform: scale(1); }
    78% { opacity: 1; transform: scale(1); }
    100% { opacity: 0; transform: scale(0.98) translateY(-10px); }
}

@keyframes turnTransitionParticle {
    0% { opacity: 0; transform: translate(0, 0) scale(0.4); }
    18% { opacity: 1; }
    100% { opacity: 0; transform: translate(var(--particle-x), var(--particle-y)) scale(1.2); }
}

@keyframes turnDeckPulse {
    0% { filter: brightness(1); }
    22% { filter: brightness(1.7) drop-shadow(0 0 18px rgba(255, 255, 255, 0.72)); }
    100% { filter: brightness(1); }
}

@keyframes turnAreaPulse {
    0% { filter: brightness(1); }
    22% { filter: brightness(1.24) drop-shadow(0 0 24px rgba(255, 255, 255, 0.34)); }
    100% { filter: brightness(1); }
}

@keyframes turnFusionPulse {
    0% { filter: brightness(1); transform: scale(1); }
    24% { filter: brightness(1.55) drop-shadow(0 0 16px rgba(251, 146, 60, 0.86)); transform: scale(1.18); }
    100% { filter: brightness(1); transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
    .turn-transition-effect,
    body.turn-transition-player #deck,
    body.turn-transition-opponent #deck,
    body.turn-transition-fusion .place-rule-dot-orange,
    body.turn-transition-player .player-area,
    body.turn-transition-opponent .opponent-area {
        animation-duration: 1ms;
    }
}