body {
            font-family: 'Inter', sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            background-attachment: fixed;
        }
        
        .glassmorphism {
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
        }
        
        .card-hover {
            transition: all 0.3s ease;
        }
        
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 28px 0 rgba(31, 38, 135, 0.15);
        }
        
        .input-field {
            transition: all 0.3s ease;
            border: 1px solid rgba(0, 0, 0, 0.1);
        }
        
        .input-field:focus {
            border-color: #6366f1;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.4);
        }
        
        .btn-secondary {
            background: linear-gradient(135deg, #94a3b8 0%, #cbd5e1 100%);
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 6px -1px rgba(148, 163, 184, 0.4);
        }
        
        .tab-active {
            color: #6366f1;
            border-bottom: 2px solid #6366f1;
        }
        
        .error-message {
            color: #ef4444;
            font-size: clamp(0.75rem, 2vw, 0.875rem);
            margin-top: 0.25rem;
        }
        
        .verification-code-container {
            display: flex;
            gap: 10px;
        }
        
        .verification-code-container input {
            flex: 1;
        }
        
        .collapsible-section {
            transition: all 0.3s ease;
        }
        
        .collapsible-content {
            max-height: 500px;
            transition: max-height 0.3s ease;
            overflow: hidden;
        }
        
        .collapsed .collapsible-content {
            max-height: 0;
            overflow: hidden;
        }
        
        .toggle-btn {
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }
        
        .avatar-upload {
            position: relative;
            width: 120px;
            height: 120px;
            margin: 0 auto;
            border-radius: 50%;
            overflow: hidden;
            border: 2px dashed #cbd5e1;
            cursor: pointer;
        }
        
        .avatar-preview {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .avatar-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .avatar-upload:hover .avatar-overlay {
            opacity: 1;
        }
        
        .progress-container {
            height: 4px;
            width: 100%;
            background-color: #e2e8f0;
            border-radius: 2px;
            overflow: hidden;
            margin-top: 10px;
        }
        
        .progress-bar {
            height: 100%;
            background-color: #6366f1;
            width: 0%;
            transition: width 0.3s ease;
        }
        
        /* 登录方式切换 */
        .login-method-tabs {
            display: flex;
            border-bottom: 1px solid #e2e8f0;
            margin-bottom: 1rem;
        }
        
        .login-method-tab {
            padding: 0.5rem 1rem;
            cursor: pointer;
            border-bottom: 2px solid transparent;
        }
        
        .login-method-tab.active {
            border-bottom-color: #6366f1;
            color: #6366f1;
            font-weight: medium;
        }
        
        /* 密码强度指示器 */
        .password-strength {
            margin-top: 0.25rem;
        }
        
        .strength-labels {
            display: flex;
            justify-content: space-between;
            font-size: 0.75rem;
            color: #64748b;
            margin-bottom: 4px;
        }
        
        .strength-bars {
            display: flex;
            gap: 2px;
            height: 4px;
        }
        
        .strength-bar {
            flex: 1;
            background-color: #e2e8f0;
            border-radius: 2px;
            transition: background-color 0.3s ease;
        }
        
        .strength-bar.weak {
            background-color: #ef4444;
        }
        
        .strength-bar.medium {
            background-color: #f59e0b;
        }
        
        .strength-bar.strong {
            background-color: #10b981;
        }
        
        .password-requirements {
            margin-top: 0.5rem;
            font-size: 0.75rem;
            color: #64748b;
        }
        
        .password-requirements ul {
            list-style-type: none;
            padding-left: 0;
        }
        
        .password-requirements li {
            display: flex;
            align-items: center;
            margin-bottom: 2px;
        }
        
        .password-requirements li i {
            width: 16px;
            margin-right: 4px;
        }
        
        .password-requirements li.valid i {
            color: #10b981;
        }
        
        .password-requirements li.invalid i {
            color: #94a3b8;
        }
        
        /* 小屏幕竖屏样式 */
        @media (max-width: 640px) {
            .verification-code-container {
                flex-direction: column;
            }
            
            .verification-code-container button {
                width: 100%;
            }
        }
        
        /* 手机横屏样式 */
        @media (max-height: 450px) and (orientation: landscape) {
            .glassmorphism {
                padding: 4px 8px;
                max-height: 90vh;
                overflow-y: auto;
            }
            
            .tab-container {
                margin-bottom: 0.5rem;
            }
            
            .form-container {
                padding: 0 1rem;
            }
            
            .loginForm, .registerForm, .profileForm, .changePasswordForm {
                gap: 0.75rem;
                padding: 0.5rem 0;
            }
            
            .form-field {
                margin-bottom: 0.25rem;
            }
            
            .input-field {
                padding: 0.65rem;
            }
            
            .btn-primary, .btn-secondary {
                padding: 0.65rem;
            }
            
            .collapsible-section {
                margin-top: 0.5rem;
                font-size: 0.85rem;
            }
            
            .tech-stack, .security-features {
                padding: 0.5rem;
            }
            
            .footer-text {
                font-size: 0.75rem;
                margin-top: 0.5rem;
            }
        }
        
        /* 平板横屏样式 */
        @media (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
            .glassmorphism {
                padding: 1.5rem;
                max-width: 80%;
            }
            
            .registerForm, .profileForm, .changePasswordForm {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            
            .registerForm h2, .profileForm h2, .changePasswordForm h2 {
                grid-column: 1 / -1;
            }
            
            .full-width {
                grid-column: 1 / -1;
            }
            
            .tech-stack, .security-features {
                margin-top: 1rem;
            }
        }