:root {
            --primary: #07C160;
            --secondary: #1AAD19;
            --light-bg: #F5F5F5;
            --border: #E0E0E0;
            --text-dark: #333333;
            --text-light: #666666;
            --text-lighter: #999999;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
        }
        
        body {
            background-color: var(--light-bg);
            color: var(--text-dark);
            line-height: 1.6;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
        }
        
        .login-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 400px;
            padding: 40px;
            animation: fadeIn 0.5s ease-in-out;
            position: relative;
            overflow: hidden;
        }
        
        .login-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: var(--primary);
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .logo {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .logo i {
            font-size: 50px;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .logo h1 {
            font-size: 24px;
            color: var(--text-dark);
            font-weight: 600;
        }
        
        .logo p {
            color: var(--text-light);
            font-size: 14px;
            margin-top: 5px;
        }
        
        .form-group {
            margin-bottom: 20px;
            position: relative;
        }
        
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: var(--text-dark);
        }
        
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 2px rgba(7, 193, 96, 0.2);
        }
        
        .btn {
            width: 100%;
            padding: 12px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }
        
        .btn:hover {
            background: var(--secondary);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(7, 193, 96, 0.3);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .error {
            color: #ff4d4f;
            text-align: center;
            margin-bottom: 20px;
            font-size: 14px;
            padding: 10px;
            background: #fff2f0;
            border-radius: 4px;
            animation: shake 0.5s;
        }
        
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            20%, 60% { transform: translateX(-5px); }
            40%, 80% { transform: translateX(5px); }
        }
        
        .footer {
            text-align: center;
            margin-top: 30px;
            color: var(--text-light);
            font-size: 14px;
        }
        
        .footer a {
            color: var(--primary);
            text-decoration: none;
        }
        
        .password-toggle {
            position: absolute;
            right: 10px;
            top: 38px;
            cursor: pointer;
            color: var(--text-lighter);
        }
        
        .extra-options {
            display: flex;
            justify-content: space-between;
            margin-top: 15px;
            font-size: 14px;
        }
        
        .extra-options a {
            color: var(--text-light);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .extra-options a:hover {
            color: var(--primary);
        }
        
        .social-login {
            margin-top: 30px;
            text-align: center;
        }
        
        .social-login p {
            color: var(--text-light);
            font-size: 14px;
            margin-bottom: 15px;
            position: relative;
        }
        
        .social-login p::before,
        .social-login p::after {
            content: '';
            position: absolute;
            top: 50%;
            width: 30%;
            height: 1px;
            background: var(--border);
        }
        
        .social-login p::before {
            left: 0;
        }
        
        .social-login p::after {
            right: 0;
        }
        
        .social-icons {
            display: flex;
            justify-content: center;
            gap: 15px;
        }
        
        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 18px;
            transition: transform 0.3s;
        }
        
        .social-icon:hover {
            transform: translateY(-3px);
        }
        
        .wechat {
            background: #07C160;
        }
        
        .weibo {
            background: #E6162D;
        }
        
        .qq {
            background: #12B7F5;
        }