/**
 * 赞助商展示组件样式
 * 设计理念：简洁、现代、高效的横向Logo展示
 */

.sponsor-widget {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    padding: 20px;
    margin-bottom: 24px;
}

.sponsor-widget-header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid #f0f0f0;
}

.sponsor-widget-title {
    font-size: 15px;
    font-weight: 600;
    color: #333;
    margin: 0;
    text-align: center;
}

.sponsor-widget-icon {
    margin-right: 6px;
    font-size: 16px;
}

.sponsor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 12px;
    padding: 0;
}

.sponsor-item {
    display: block;
    text-decoration: none;
    border-radius: 8px;
    overflow: hidden;
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    transition: all 0.2s ease;
    aspect-ratio: 16/9;
    position: relative;
}

.sponsor-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-color: #007bff;
}

.sponsor-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: white;
    padding: 8px;
    box-sizing: border-box;
}

.sponsor-logo.error {
    opacity: 0.5;
    background: #f8f9fa;
}

/* Tooltip 样式 */
.sponsor-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    margin-bottom: 8px;
    pointer-events: none;
}

.sponsor-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
}

.sponsor-item:hover .sponsor-tooltip {
    opacity: 1;
    visibility: visible;
}

/* 空状态样式 */
.sponsor-empty {
    text-align: center;
    color: #999;
    font-size: 14px;
    padding: 20px;
}

.sponsor-empty-icon {
    font-size: 32px;
    opacity: 0.5;
    margin-bottom: 8px;
}

/* 加载状态 */
.sponsor-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: #999;
}

.sponsor-loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #4A90E2;
    border-radius: 50%;
    animation: sponsor-spin 1s linear infinite;
    margin-right: 8px;
}

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

/* 移动端适配 */
@media (max-width: 768px) {
    .sponsor-widget {
        /* 移动端隐藏，在底部显示 */
        display: none;
    }
}

/* 移动端底部展示 - 已废弃，使用新的mobile-sidebar-bottom */
.sponsor-mobile-bottom {
    display: none;
}

/* 点击动效 */
.sponsor-item:active {
    transform: scale(0.95);
}

/* 特殊状态：VIP 赞助商 */
.sponsor-item.sponsor-vip {
    background: linear-gradient(135deg, #fff9e6, #fff2cc);
    border-color: #ffd700;
}

.sponsor-item.sponsor-vip:hover {
    background: linear-gradient(135deg, #fff5d6, #ffeb99);
    border-color: #ffcd00;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

/* 赞助商统计 */
.sponsor-stats {
    font-size: 11px;
    color: #666;
    text-align: center;
    margin-top: 12px;
    padding-top: 8px;
    border-top: 1px solid #f0f0f0;
}

.sponsor-item .sponsor-placeholder {
    display: none;
    width: 100%;
    height: 100%;
    background: #f5f5f5;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.sponsor-item .sponsor-placeholder::before {
    content: '📷';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 18px;
    opacity: 0.5;
}

.sponsor-logo.error + .sponsor-placeholder {
    display: block;
}

/* 无障碍优化 */
.sponsor-item:focus {
    outline: 2px solid #4A90E2;
    outline-offset: 2px;
}

.sponsor-item:focus .sponsor-tooltip {
    opacity: 1;
    visibility: visible;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .sponsor-item {
        border-width: 2px;
    }
    
    .sponsor-tooltip {
        background: #000;
        border: 1px solid #fff;
    }
}

/* 暗色主题适配 */
@media (prefers-color-scheme: dark) {
    .sponsor-item {
        background: #2d3748;
        border-color: #4a5568;
    }
    
    .sponsor-item:hover {
        border-color: #63b3ed;
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    
    .sponsor-logo {
        background: white;
    }
    
    .sponsor-mobile-bottom {
        background: #1a202c;
        border-color: #4a5568;
    }
    
    .sponsor-mobile-bottom h3 {
        color: #e2e8f0;
    }
}