/* ============================================
   动画效果 - AI Forum
   ============================================ */

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 滑动动画 */
@keyframes slideInUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

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

/* 缩放动画 */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* 旋转动画 */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 弹跳动画 */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* 摇晃动画 */
@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

/* 加载动画 */
@keyframes loadingDots {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* 打字机效果 */
@keyframes typing {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes blink {
    50% {
        border-color: transparent;
    }
}

/* 应用动画的类 */
.fade-in {
    animation: fadeIn 0.5s ease;
}

.fade-in-up {
    animation: fadeInUp 0.5s ease;
}

.fade-in-down {
    animation: fadeInDown 0.5s ease;
}

.fade-in-left {
    animation: fadeInLeft 0.5s ease;
}

.fade-in-right {
    animation: fadeInRight 0.5s ease;
}

.scale-in {
    animation: scaleIn 0.3s ease;
}

.bounce {
    animation: bounce 1s ease;
}

.shake {
    animation: shake 0.5s ease;
}

.pulse {
    animation: pulse 2s ease infinite;
}

/* 加载器 */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner-sm {
    width: 24px;
    height: 24px;
    border-width: 3px;
}

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

.loading-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    animation: loadingDots 1.4s ease infinite;
}

.loading-dots span:nth-child(1) {
    animation-delay: 0s;
}

.loading-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

/* 骨架屏 */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary) 0%,
        var(--bg-secondary) 50%,
        var(--bg-tertiary) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s ease infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 16px;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

/* 悬浮效果 */
.hover-lift {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* 过渡效果 */
.transition-all {
    transition: all var(--transition-normal);
}

.transition-colors {
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.transition-transform {
    transition: transform var(--transition-normal);
}

/* 列表项进入动画（依次） */
.list-item-enter {
    opacity: 0;
    transform: translateY(20px);
}

.list-item-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.3s ease;
}

/* 消息气泡动画 */
@keyframes messagePop {
    0% {
        opacity: 0;
        transform: scale(0.8) translateY(10px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.message-bubble {
    animation: messagePop 0.3s ease;
}

/* 进度条动画 */
@keyframes progressFill {
    from {
        width: 0;
    }
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-sm);
    animation: progressFill 1s ease;
}

/* 通知弹出动画 */
@keyframes toastSlide {
    0% {
        transform: translateX(100%);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast {
    animation: toastSlide 0.3s ease;
}

/* 渐入延迟 */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* ============================================
   落英（花瓣）动效
   ============================================ */
.petals-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

@keyframes petalFall {
    0% {
        transform: translateY(-10vh) rotate(0deg) translateX(0);
        opacity: 1;
    }
    25% {
        transform: translateY(25vh) rotate(90deg) translateX(20px);
    }
    50% {
        transform: translateY(50vh) rotate(180deg) translateX(-20px);
    }
    75% {
        transform: translateY(75vh) rotate(270deg) translateX(15px);
    }
    100% {
        transform: translateY(110vh) rotate(360deg) translateX(-10px);
        opacity: 0;
    }
}

@keyframes petalSway {
    0%, 100% {
        transform: translateX(0) rotate(0deg);
    }
    25% {
        transform: translateX(30px) rotate(10deg);
    }
    50% {
        transform: translateX(-20px) rotate(-5deg);
    }
    75% {
        transform: translateX(25px) rotate(8deg);
    }
}

.petal {
    position: absolute;
    width: 15px;
    height: 15px;
    background: linear-gradient(135deg, #ffb7c5 0%, #ff69b4 50%, #ff1493 100%);
    border-radius: 50% 0 50% 50%;
    opacity: 0.8;
    animation: petalFall linear infinite;
    box-shadow: 0 2px 4px rgba(255, 105, 180, 0.3);
}

.petal::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: inherit;
    border-radius: inherit;
    transform: rotate(45deg) scale(0.8);
    opacity: 0.6;
}

.petal:nth-child(odd) {
    background: linear-gradient(135deg, #ffc0cb 0%, #ffb6c1 50%, #ff69b4 100%);
}

.petal:nth-child(3n) {
    width: 12px;
    height: 12px;
}

.petal:nth-child(5n) {
    width: 18px;
    height: 18px;
}

/* 深色模式下的花瓣 */
[data-theme="dark"] .petal {
    opacity: 0.6;
    filter: brightness(0.8);
}