* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
        }
        
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, #141e30, #243b55);
            padding: 16px;
        }
        
        .container {
            width: 100%;
            max-width: 900px;
            display: flex;
            flex-direction: column;
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(12px);
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .header {
            padding: 32px;
            text-align: center;
            background: rgba(0, 0, 0, 0.2);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        
        .logo-icon {
            font-size: 36px;
            color: #ff5e62;
            margin-right: 15px;
            text-shadow: 0 0 15px rgba(255, 94, 98, 0.5);
        }
        
        .logo-text {
            font-size: 32px;
            font-weight: 700;
            background: linear-gradient(to right, #ff9966, #ff5e62);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
        }
        
        .slogan {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 400px;
            margin: 0 auto;
            line-height: 1.5;
        }
        
        .tabs {
            display: flex;
            margin: 0 32px;
            position: relative;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .tab {
            flex: 1;
            padding: 20px 0;
            text-align: center;
            font-size: 18px;
            font-weight: 600;
            color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .tab.active {
            color: #fff;
        }
        
        .tab.active::after {
            content: "";
            position: absolute;
            bottom: -1px;
            left: 20%;
            width: 60%;
            height: 3px;
            background: linear-gradient(to right, #ff9966, #ff5e62);
            border-radius: 3px;
        }
        
        .content {
            padding: 32px;
        }
        
        .form {
            display: none;
            animation: fadeIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
        }
        
        .form.active {
            display: block;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .input-group {
            margin-bottom: 24px;
            position: relative;
        }
        
        .input-label {
            display: block;
            margin-bottom: 10px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.8);
            font-size: 15px;
            display: flex;
            align-items: center;
        }
        
        .input-label i {
            margin-right: 8px;
            font-size: 18px;
        }
        
        .input-container {
            position: relative;
        }
        
        .input-container i {
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: rgba(255, 255, 255, 0.5);
            font-size: 18px;
        }
        
        input {
            width: 100%;
            padding: 18px 20px 18px 52px;
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            font-size: 16px;
            transition: all 0.3s ease;
            color: white;
            outline: none;
        }
        
        input:focus {
            border-color: rgba(255, 255, 255, 0.3);
            background: rgba(255, 255, 255, 0.1);
            box-shadow: 0 0 0 3px rgba(255, 94, 98, 0.2);
        }
        
        .password-toggle {
            position: absolute;
            right: 18px;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: rgba(255, 255, 255, 0.6);
            font-size: 20px;
            transition: all 0.2s ease;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }
        
        .password-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
            color: white;
        }
        
        .password-strength {
            height: 6px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
            margin-top: 12px;
            overflow: hidden;
            position: relative;
        }
        
        .password-strength::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: var(--strength, 0%);
            height: 100%;
            background: #ff5e62;
            border-radius: 3px;
            transition: width 0.5s ease;
        }
        
        .password-strength-text {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
            text-align: right;
        }
        
        .options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 28px 0;
            font-size: 14px;
        }
        
        .remember {
            display: flex;
            align-items: center;
        }
        
        .remember input {
            width: auto;
            margin-right: 10px;
            position: relative;
            top: 1px;
        }
        
        .checkbox-label {
            display: flex;
            align-items: center;
            color: rgba(255, 255, 255, 0.7);
        }
        
        .forgot-password {
            color: #ff9966;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s ease;
        }
        
        .forgot-password:hover {
            color: #ff5e62;
            text-decoration: underline;
        }
        
        .btn {
            display: block;
            width: 100%;
            padding: 18px;
            background: linear-gradient(to right, #ff9966, #ff5e62);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 17px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(255, 94, 98, 0.3);
        }
        
        .btn::before {
            content: "";
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: all 0.6s ease;
        }
        
        .btn:hover::before {
            left: 100%;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 25px rgba(255, 94, 98, 0.4);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .switch-text {
            text-align: center;
            margin-top: 30px;
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
        }
        
        .switch-link {
            color: #ff9966;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.2s ease;
            margin-left: 6px;
        }
        
        .switch-link:hover {
            color: #ff5e62;
            text-decoration: underline;
        }
        
        .divider {
            display: flex;
            align-items: center;
            margin: 30px 0;
            color: rgba(255, 255, 255, 0.4);
        }
        
        .divider::before,
        .divider::after {
            content: "";
            flex: 1;
            height: 1px;
            background: rgba(255, 255, 255, 0.1);
        }
        
        .divider span {
            padding: 0 16px;
            font-size: 14px;
        }
        
        .social-login {
            margin-top: 24px;
            margin-bottom: 8px;
            text-align: center;
        }
        
        .social-buttons {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 24px;
        }
        
        .social-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 14px;
            color: white;
            font-size: 18px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .social-btn:hover {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        
        .facebook-btn:hover {
            background: rgba(59, 89, 152, 0.2);
            border-color: rgba(59, 89, 152, 0.4);
        }
        
        .google-btn:hover {
            background: rgba(221, 75, 57, 0.2);
            border-color: rgba(221, 75, 57, 0.4);
        }
        
        .twitter-btn:hover {
            background: rgba(29, 161, 242, 0.2);
            border-color: rgba(29, 161, 242, 0.4);
        }
        
        .message {
            padding: 18px;
            border-radius: 12px;
            margin-bottom: 24px;
            text-align: center;
            display: none;
            font-size: 15px;
            line-height: 1.5;
        }
        
        .error {
            background: rgba(198, 40, 40, 0.15);
            color: #ff5252;
            border: 1px solid rgba(255, 80, 80, 0.3);
        }
        
        .success {
            background: rgba(46, 125, 50, 0.15);
            color: #69f0ae;
            border: 1px solid rgba(100, 255, 170, 0.3);
        }
        

        
        .footer {
            padding: 24px 32px;
            text-align: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 13px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .footer a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            margin: 0 8px;
            transition: color 0.2s ease;
        }
        
        .footer a:hover {
            color: #ff9966;
            text-decoration: underline;
        }
        
        /* 移动端优化 */
        @media (max-width: 768px) {
            .container {
                border-radius: 20px;
            }
            
            .header {
                padding: 24px 20px;
            }
            
            .logo-text {
                font-size: 28px;
            }
            
            .tabs {
                margin: 0 20px;
            }
            
            .tab {
                padding: 18px 0;
                font-size: 16px;
            }
            
            .content {
                padding: 24px 20px;
            }
            
            input {
                padding: 16px 18px 16px 48px;
                font-size: 15px;
            }
            
            .btn {
                padding: 16px;
                font-size: 16px;
            }
            
            .footer {
                padding: 20px;
                font-size: 12px;
            }
        }
        
        @media (max-width: 480px) {
            .options {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .forgot-password {
                margin-top: 14px;
            }
            
            .logo {
                flex-direction: column;
                text-align: center;
            }
            
            .logo-icon {
                margin-right: 0;
                margin-bottom: 12px;
            }
            
            .social-buttons {
                grid-template-columns: 1fr;
                gap: 12px;
            }
        }
        
        /* 下载按钮样式 */
        .download-section {
            margin-top: 25px;
            text-align: center;
        }
        
        .download-title {
            margin-bottom: 16px;
            color: rgba(255, 255, 255, 0.5);
            font-size: 13px;
            position: relative;
        }
        
        .download-title::before,
        .download-title::after {
            content: "";
            position: absolute;
            top: 50%;
            width: 40px;
            height: 1px;
            background: rgba(255, 255, 255, 0.08);
        }
        
        .download-title::before {
            left: 0;
        }
        
        .download-title::after {
            right: 0;
        }
        
        .download-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .download-btn {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 16px;
            border-radius: 8px;
            text-decoration: none;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.2s ease;
            border: 1px solid rgba(255, 255, 255, 0.08);
            min-width: 100px;
            justify-content: center;
            background: rgba(255, 255, 255, 0.05);
            color: rgba(255, 255, 255, 0.8);
        }
        
        .app-download {
            background: rgba(78, 205, 196, 0.15);
            border-color: rgba(78, 205, 196, 0.3);
            color: #4ecdc4;
        }
        
        .app-download:hover {
            background: rgba(78, 205, 196, 0.25);
            border-color: rgba(78, 205, 196, 0.5);
            color: #5dd5cd;
            transform: translateY(-1px);
        }
        
        .pc-download {
            background: rgba(69, 183, 209, 0.15);
            border-color: rgba(69, 183, 209, 0.3);
            color: #45b7d1;
        }
        
        .pc-download:hover {
            background: rgba(69, 183, 209, 0.25);
            border-color: rgba(69, 183, 209, 0.5);
            color: #4fc5db;
            transform: translateY(-1px);
        }
        
        .download-btn i {
            font-size: 14px;
        }
        
        /* 移动端下载按钮优化 */
        @media (max-width: 768px) {
            .download-buttons {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            
            .download-btn {
                width: 100%;
                max-width: 180px;
                padding: 12px 20px;
            }
        }