/* ==================== 动画效果 ==================== */

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) translateY(30px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes glow {
    0%, 100% {
        text-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
    }
    50% {
        text-shadow: 0 0 20px rgba(0, 212, 255, 0.8);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 应用动画 */
.header {
    animation: slideInDown 0.5s ease-out;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-value {
    animation: glow 2s ease-in-out infinite;
}

.start-button:active {
    animation: pulse 0.3s ease-out;
}

.btn-primary:active {
    animation: pulse 0.3s ease-out;
}

/* 屏幕切换动画 */
.screen-enter {
    animation: fadeIn 0.3s ease-out;
}

.screen-exit {
    animation: fadeOut 0.3s ease-out;
}

/* 分数更新动画 */
.score-update {
    animation: bounce 0.4s ease-out;
}

/* 成就解锁动画 */
.achievement-unlock {
    animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 障碍物碰撞闪烁 */
.collision-flash {
    animation: collisionFlash 0.3s ease-out;
}

@keyframes collisionFlash {
    0% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.5) hue-rotate(10deg);
    }
    100% {
        filter: brightness(1);
    }
}