* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    color: white;
    font-size: 2.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Download List */
.download-list {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    overflow: hidden;
}

.download-item {
    display: flex;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.3s ease;
}

.download-item:last-child {
    border-bottom: none;
}

.download-item:hover {
    background-color: #f8f9fa;
}

.file-icon {
    font-size: 2rem;
    margin-right: 20px;
    width: 50px;
    text-align: center;
}

.file-icon.document { color: #4285f4; }
.file-icon.image { color: #ea4335; }
.file-icon.video { color: #fbbc04; }
.file-icon.software { color: #34a853; }

.file-info {
    flex: 1;
}

.file-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #333;
}

.file-meta {
    color: #666;
    font-size: 0.9rem;
}

.file-actions {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-copy {
    background: #f8f9fa;
    color: #666;
    border: 1px solid #e9ecef;
}

.btn-copy:hover {
    background: #e9ecef;
    color: #333;
}

/* Toast 提示 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #28a745;
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .download-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .file-info {
        width: 100%;
    }
    
    .file-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .file-icon {
        margin-right: 0;
        margin-bottom: 10px;
    }
}