.loader {
    border: 4px solid rgba(66, 133, 244, 0.2);
    border-top: 4px solid transparent;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1.2s cubic-bezier(0.5, 0.1, 0.5, 0.9) infinite;
    margin: 0 auto;
    position: relative;
    background: conic-gradient(from 0deg, var(--primary-color), var(--secondary-color), var(--primary-color));
    background-clip: padding-box;
}

.loader::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    right: 4px;
    bottom: 4px;
    background: var(--bg-color);
    border-radius: 50%;
}

.loader::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    background: conic-gradient(from 0deg, transparent, var(--primary-color), transparent);
    border-radius: 50%;
    animation: spin 2s linear infinite reverse;
    opacity: 0.6;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 加载背景遮罩 */
#loading {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.95) 100%);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: fadeInScale 0.5s ease-out;
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

#loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    animation: shimmer 2s infinite;
}

#loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
    animation: shimmer 2s infinite;
}

/* 加载中的文本样式 */
.loading-text {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-base);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    font-weight: 600;
    animation: pulse 2s infinite;
    position: relative;
}

.loading-text::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: translateX(-50%);
    border-radius: 2px;
    animation: slideIn 1s ease-out 0.5s both;
}

@keyframes pulse {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.02); }
}

@keyframes fadeInScale {
    from { 
        opacity: 0; 
        transform: translateY(-30px) scale(0.9); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

@keyframes slideIn {
    from { width: 0; }
    to { width: 40px; }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}