/* ========== 页面转场动画 ========== */
.screen-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

/* 淡入淡出 */
.transition-fade-enter {
    opacity: 0;
    transform: scale(0.95);
}

.transition-fade-enter-active {
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.transition-fade-exit {
    opacity: 1;
    transform: scale(1);
}

.transition-fade-exit-active {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 滑动进入 */
.transition-slide-left-enter {
    transform: translateX(100%);
}

.transition-slide-left-enter-active {
    transform: translateX(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-slide-left-exit {
    transform: translateX(0);
}

.transition-slide-left-exit-active {
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-slide-right-enter {
    transform: translateX(-100%);
}

.transition-slide-right-enter-active {
    transform: translateX(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-slide-right-exit {
    transform: translateX(0);
}

.transition-slide-right-exit-active {
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 缩放效果 */
.transition-zoom-enter {
    opacity: 0;
    transform: scale(0.8);
}

.transition-zoom-enter-active {
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.transition-zoom-exit {
    opacity: 1;
    transform: scale(1);
}

.transition-zoom-exit-active {
    opacity: 0;
    transform: scale(1.1);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 翻转效果 */
.transition-flip-enter {
    opacity: 0;
    transform: rotateY(-180deg);
}

.transition-flip-enter-active {
    opacity: 1;
    transform: rotateY(0);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-flip-exit {
    opacity: 1;
    transform: rotateY(0);
}

.transition-flip-exit-active {
    opacity: 0;
    transform: rotateY(180deg);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

/* ========== 元素动画 ========== */

/* 弹跳进入 */
@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3) translateY(-100px);
    }
    50% {
        transform: scale(1.05) translateY(0);
    }
    70% {
        transform: scale(0.9) translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.bounce-in {
    animation: bounceIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

/* 脉冲动画 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* 闪烁效果 */
@keyframes flash {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.flash {
    animation: flash 1s ease-in-out infinite;
}

/* 摇晃效果 */
@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-10px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(10px);
    }
}

.shake {
    animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

/* 旋转进入 */
@keyframes rotateIn {
    0% {
        opacity: 0;
        transform: rotate(-200deg) scale(0.5);
    }
    100% {
        opacity: 1;
        transform: rotate(0) scale(1);
    }
}

.rotate-in {
    animation: rotateIn 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* 下落效果 */
@keyframes dropIn {
    0% {
        opacity: 0;
        transform: translateY(-200px);
    }
    60% {
        transform: translateY(10px);
    }
    80% {
        transform: translateY(-5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.drop-in {
    animation: dropIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

/* 漂浮动画 */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.float {
    animation: float 3s ease-in-out infinite;
}

/* 发光效果 */
@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
    }
    50% {
        box-shadow: 0 0 40px rgba(102, 126, 234, 1), 0 0 60px rgba(102, 126, 234, 0.5);
    }
}

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

/* 渐变色彩流动 */
@keyframes gradientFlow {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.gradient-flow {
    background-size: 200% 200%;
    animation: gradientFlow 3s ease infinite;
}

/* ========== 粒子效果 ========== */

/* 樱花飘落 */
@keyframes sakuraFall {
    0% {
        transform: translateY(-10px) rotate(0deg) translateX(0);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg) translateX(100px);
        opacity: 0;
    }
}

.sakura-particle {
    position: fixed;
    top: -20px;
    font-size: 20px;
    animation: sakuraFall 5s linear forwards;
    pointer-events: none;
    z-index: 9000;
}

/* 星星闪烁 */
@keyframes starTwinkle {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

.star-twinkle {
    animation: starTwinkle 1.5s ease-in-out infinite;
}

/* 火花四溅 */
@keyframes spark {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

.spark {
    position: absolute;
    width: 6px;
    height: 6px;
    background: #fbbf24;
    border-radius: 50%;
    animation: spark 0.8s ease-out forwards;
    pointer-events: none;
}

/* 彩带飘落 */
@keyframes confettiFall {
    0% {
        transform: translateY(-100px) rotate(0deg) scaleX(1);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg) scaleX(0.1);
        opacity: 0;
    }
}

.confetti {
    position: fixed;
    width: 10px;
    height: 15px;
    animation: confettiFall 3s linear forwards;
    pointer-events: none;
    z-index: 9000;
}

/* 波纹效果 */
@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    animation: ripple 0.6s ease-out forwards;
    pointer-events: none;
}

/* ========== 进度条动画 ========== */

/* 进度条填充 */
@keyframes progressFill {
    from {
        width: 0;
    }
}

.progress-animate {
    animation: progressFill 1s ease-out forwards;
}

/* 条纹流动 */
@keyframes stripeFlow {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 40px 0;
    }
}

.progress-striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 40px 40px;
    animation: stripeFlow 1s linear infinite;
}

/* ========== 按钮点击效果 ========== */

/* 按钮涟漪 */
.btn-ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: scale(0);
    animation: btnRipple 0.6s ease-out;
    pointer-events: none;
}

@keyframes btnRipple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* 按钮按压 */
.btn-press {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

/* ========== 卡片翻转 ========== */

.card-flip {
    perspective: 1000px;
}

.card-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card-flip.flipped .card-flip-inner {
    transform: rotateY(180deg);
}

.card-flip-front,
.card-flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.card-flip-back {
    transform: rotateY(180deg);
}

/* ========== 数字滚动动画 ========== */

@keyframes numberRoll {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.number-roll {
    display: inline-block;
    overflow: hidden;
}

.number-roll span {
    display: inline-block;
    animation: numberRoll 0.5s ease forwards;
}

/* ========== 解锁动画 ========== */

@keyframes unlockShake {
    0%, 100% {
        transform: rotate(0);
    }
    25% {
        transform: rotate(-10deg);
    }
    75% {
        transform: rotate(10deg);
    }
}

.unlock-shake {
    animation: unlockShake 0.4s ease-in-out;
}

@keyframes unlockOpen {
    0% {
        transform: rotate(-30deg);
    }
    100% {
        transform: rotate(0);
    }
}

.unlock-open {
    animation: unlockOpen 0.3s ease forwards;
}

/* ========== 升级动画 ========== */

@keyframes levelUpGlow {
    0% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 60px rgba(102, 126, 234, 1), 0 0 100px rgba(118, 75, 162, 0.5);
        transform: scale(1.1);
    }
    100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
        transform: scale(1);
    }
}

.level-up {
    animation: levelUpGlow 1.5s ease-in-out;
}

/* ========== 连击效果 ========== */

@keyframes comboPop {
    0% {
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.3) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.combo-pop {
    animation: comboPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ========== 正确答案高亮 ========== */

@keyframes correctFlash {
    0%, 100% {
        background-color: var(--bg-card-light);
    }
    50% {
        background-color: rgba(74, 222, 128, 0.3);
    }
}

.correct-flash {
    animation: correctFlash 0.5s ease-in-out;
}

/* ========== 错误答案震动 ========== */

@keyframes wrongShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-15px);
    }
    50% {
        transform: translateX(15px);
    }
    75% {
        transform: translateX(-15px);
    }
}

.wrong-shake {
    animation: wrongShake 0.4s ease-in-out;
}

/* ========== 加载动画 ========== */

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse-dot {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.5;
    }
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-dots {
    display: flex;
    gap: 8px;
}

.loading-dot {
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: pulse-dot 1.4s ease-in-out infinite;
}

.loading-dot:nth-child(1) { animation-delay: 0s; }
.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }

/* ========== 成就解锁 ========== */

@keyframes achievementSlide {
    0% {
        transform: translateX(-100%) scale(0.8);
        opacity: 0;
    }
    100% {
        transform: translateX(0) scale(1);
        opacity: 1;
    }
}

.achievement-popup {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 2px solid var(--warning-color);
    border-radius: 15px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    z-index: 10000;
    animation: achievementSlide 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.achievement-icon {
    font-size: 2.5rem;
    animation: achievementBounce 0.8s ease infinite;
}

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

/* ========== 倒计时警告 ========== */

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

.timer-warning {
    animation: timerWarning 1s ease-in-out infinite;
}

.timer-danger {
    animation: timerWarning 0.5s ease-in-out infinite;
}

/* ========== 分数增加动画 ========== */

@keyframes scoreIncrease {
    0% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translateY(-50px) scale(1.5);
        opacity: 0;
    }
}

.score-float {
    position: absolute;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--success-color);
    animation: scoreIncrease 1s ease-out forwards;
    pointer-events: none;
}

/* ========== 背景粒子 ========== */

.bg-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(102, 126, 234, 0.5);
    border-radius: 50%;
    animation: particleFloat 15s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) translateX(100px);
        opacity: 0;
    }
}