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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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 {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.tabs {
    display: flex;
    background: white;
    border-radius: 12px;
    padding: 6px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.tab-btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #666;
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.tab-btn:hover:not(.active) {
    background: #f8f9fa;
    color: #333;
}

.tab-content {
    display: none;
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.tab-content.active {
    display: block;
}

/* 上传区域样式 */
.upload-area {
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.generate-from-btn {
    background: #6c5ce7;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.generate-from-btn:hover {
    background: #5f4dd0;
    transform: translateY(-1px);
}

.upload-area:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.upload-area.dragover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.upload-content h3 {
    margin-bottom: 10px;
    color: #333;
}

.upload-content p {
    color: #666;
    margin-bottom: 20px;
}

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

.upload-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.upload-btn, .paste-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.paste-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.upload-btn:hover, .paste-btn:hover {
    transform: translateY(-2px);
}

.upload-btn:hover {
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.paste-btn:hover {
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

/* 结果区域样式 */
.result-area {
    margin-top: 30px;
}

.result-content h3 {
    margin-bottom: 20px;
    color: #333;
}

.qr-preview {
    text-align: center;
    margin-bottom: 20px;
}

.qr-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.qr-content label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #333;
}

.qr-content textarea {
    width: 100%;
    min-height: 100px;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 0.9rem;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.qr-content textarea:focus {
    outline: none;
    border-color: #667eea;
}

.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 15px;
}

.copy-btn, .open-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

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

.copy-btn:hover {
    background: #218838;
    transform: translateY(-1px);
}

.open-btn {
    background: #007bff;
    color: white;
}

.open-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
}

/* 生成二维码表单样式 */
.encode-form {
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-group textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

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

.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

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

.generate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    width: 100%;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 二维码结果显示样式 */
.qr-result {
    text-align: center;
}

.qr-result h3 {
    margin-bottom: 20px;
    color: #333;
}

.qr-display {
    margin-bottom: 20px;
}

.qr-display canvas {
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.download-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.download-btn:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tab-content {
        padding: 20px;
    }
    
    .upload-area {
        padding: 30px 20px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons button {
        width: 100%;
    }
}

/* 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); }
}

/* 成功提示 */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 12px;
    border-radius: 6px;
    margin-top: 10px;
    border: 1px solid #c3e6cb;
}

/* 错误提示 */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 12px;
    border-radius: 6px;
    margin-top: 10px;
    border: 1px solid #f5c6cb;
}