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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    min-height: calc(100vh - 40px);
    margin-top: 20px;
    margin-bottom: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e9ecef;
}

header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

nav {
    margin-top: 15px;
}

nav a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    margin: 0 10px;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

nav a:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.upload-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.upload-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.8rem;
}

.upload-form {
    max-width: 500px;
    margin: 0 auto;
}

.file-input-wrapper {
    position: relative;
    margin-bottom: 20px;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-input-label {
    display: block;
    padding: 20px;
    border: 2px dashed #667eea;
    border-radius: 10px;
    text-align: center;
    background: #f8f9fa;
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-input-label:hover {
    border-color: #5a6fd8;
    background: #e9ecef;
}

.file-input-text {
    color: #667eea;
    font-weight: 500;
    font-size: 1.1rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.upload-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.login-prompt {
    text-align: center;
    padding: 40px;
    background: #f8f9fa;
    border-radius: 10px;
    border: 2px solid #e9ecef;
}

.login-prompt p {
    font-size: 1.2rem;
    color: #6c757d;
}

.login-prompt a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.login-prompt a:hover {
    text-decoration: underline;
}

.stats-section {
    margin-bottom: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-item {
    background: white;
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 10px;
}

.stat-label {
    color: #6c757d;
    font-size: 1rem;
    font-weight: 500;
}

.recent-files {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.recent-files h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.file-list {
    /* 移除高度限制，让文件列表自然扩展，不显示滚动条 */
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.file-item:hover {
    background: #f8f9fa;
    border-color: #667eea;
}

.file-info {
    flex: 1;
}

.file-name {
    display: block;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 5px;
}

.file-size, .file-date {
    font-size: 0.9rem;
    color: #6c757d;
    margin-right: 15px;
}

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

.btn-download, .btn-copy, .btn-copy-static, .btn-delete, .btn-edit {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-download {
    background: #28a745;
    color: white;
}

.btn-download:hover {
    background: #218838;
}

.btn-copy {
    background: #17a2b8;
    color: white;
    position: relative;
}

.btn-copy:hover {
    background: #138496;
}

.btn-copy-static {
    background: #6f42c1;
    color: white;
    position: relative;
}

.btn-copy-static:hover {
    background: #5a32a3;
}

.btn-edit {
    background: #fd7e14;
    color: white;
}

.btn-edit:hover {
    background: #e8630a;
}

.btn-delete {
    background: #dc3545;
    color: white;
}

.btn-delete:hover {
    background: #c82333;
}

.no-files {
    text-align: center;
    color: #6c757d;
    font-style: italic;
    padding: 40px;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
    color: #6c757d;
}

/* 登录和注册表单样式 */
.auth-container {
    max-width: 400px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.auth-form h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 2rem;
}

.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form .btn-primary {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.auth-form .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.auth-links {
    text-align: center;
    margin-top: 20px;
}

.auth-links a {
    color: #667eea;
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* 消息提示样式 */
.message {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .file-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .file-actions {
        width: 100%;
        justify-content: space-around;
        margin-top: 10px;
    }
    
    .auth-container {
        margin: 10px;
        padding: 20px;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 文件拖拽样式 */
.file-input-wrapper.dragover .file-input-label {
    border-color: #28a745;
    background: #d4edda;
}

.file-input-wrapper.dragover .file-input-text {
    color: #28a745;
}

/* 工具提示 */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    white-space: nowrap;
    z-index: 1000;
}