/* ============================================
   轻量级动画效果 - 平舆一高校园社区
   ============================================ */

/* CSS 变量定义 - 简约灰色系 */
:root {
    --animation-primary: #333;
    --animation-secondary: #666;
    --animation-accent: #888;
    --animation-success: #555;
    --animation-danger: #444;
}

/* 极简背景（静态无颜色） */
.particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: #fafafa;
}

/* 轻量级过渡效果 */
.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* 按钮轻量级动画 */
.btn {
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

/* 列表项轻量级动画 */
.list-group-item {
    transition: background-color 0.2s ease, padding-left 0.2s ease;
}

.list-group-item:hover {
    padding-left: 15px;
    background: #f8fafc;
}

/* 表单输入框 */
.form-control, .form-select {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--animation-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* 导航链接 */
.nav-link {
    transition: color 0.2s ease;
}

/* 模态框 */
.modal.fade .modal-dialog {
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.modal.show .modal-dialog {
    transform: scale(1) translateY(0);
    opacity: 1;
}

/* 头像动画 */
.avatar-animated {
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.avatar-animated:hover {
    transform: scale(1.05);
    border-color: var(--animation-primary);
}

/* 加载动画（简化版） */
.loader {
    width: 30px;
    height: 30px;
    border: 2px solid #e2e8f0;
    border-top-color: var(--animation-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Toast通知 */
.toast-animated {
    animation: toast-fade 0.3s ease;
}

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

/* 骨架屏 */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 打印样式（禁用动画） */
@media print {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 移动端禁用复杂动画 */
@media (max-width: 768px) {
    .card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
    
    .list-group-item:hover {
        padding-left: 12px;
    }
}