/* 主样式文件 */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --success-color: #4cc9f0;
    --light-bg: #f8f9fa;
    --dark-bg: #212529;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fb;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 1.5rem;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: white;
    border-bottom: 1px solid #eee;
    font-weight: 600;
}

.file-card {
    height: 100%;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.file-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.1);
}

.file-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.file-actions {
    opacity: 0;
    transition: opacity 0.2s;
}

.file-card:hover .file-actions {
    opacity: 1;
}

.badge-category {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

.file-size {
    font-size: 0.85rem;
    color: #6c757d;
}

.modal-content {
    border-radius: 10px;
    border: none;
}

footer {
    margin-top: auto;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .file-card {
        margin-bottom: 1rem;
    }
    
    .file-actions {
        opacity: 1; /* 在移动设备上始终显示 */
    }
}

/* 加载动画 */
.spinner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #6c757d;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #dee2e6;
}

/* 按钮样式 */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 文件卡片网格 */
#filesGrid {
    min-height: 300px;
}