:root {
            --md-primary: #6750A4;
            --md-primary-dark: #56408A;
            --md-surface: #FFFFFF;
            --md-outline: #D1D5DB;
            --md-error: #EF4444;
            --md-on-primary: #FFFFFF;
            --md-text-primary: #1F2937;
            --md-text-secondary: #4B5563;
            --md-text-caption: #6B7280;
            --md-elevation-2: 0 2px 4px rgba(0,0,0,0.1);
            --md-divider: #E5E7EB;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: #F8FAFC;
            color: var(--md-text-primary);
            line-height: 1.5;
        }

        /* PasswordCard 主容器 */
        .password-card {
            background: var(--md-surface);
            border-radius: 16px;
            box-shadow: var(--md-elevation-2);
            margin: 16px auto;
            padding: 24px 16px;
            width: 88%;
            max-width: 400px;
        }

        /* PasswordHeader 顶部标题栏 */
        .password-header {
            height: 56px;
            display: flex;
            align-items: center;
            position: relative;
            border-bottom: 1px solid var(--md-divider);
            margin-bottom: 16px;
        }

        .back-button {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--md-primary);
            cursor: pointer;
            border: none;
            background: none;
            border-radius: 50%;
            transition: background-color 0.2s;
        }

        .back-button:hover {
            background-color: rgba(103, 80, 164, 0.08);
        }

        .back-button .material-icons {
            font-size: 24px;
        }

        .header-title {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            font-size: 20px;
            font-weight: 500;
            color: var(--md-text-primary);
        }

        /* PasswordTip 提示文本区 */
        .password-tip {
            font-size: 14px;
            color: var(--md-text-secondary);
            margin-bottom: 24px;
            line-height: 1.4;
        }

        /* PasswordInput 密码输入框 */
        .password-input-group {
            margin-bottom: 20px;
        }

        .input-label {
            font-size: 12px;
            font-weight: 500;
            color: var(--md-text-caption);
            margin-bottom: 4px;
            display: block;
            transition: color 0.2s;
        }

        .input-wrapper {
            position: relative;
            height: 56px;
        }

        .password-input {
            width: 100%;
            height: 100%;
            padding: 16px;
            border: 1px solid var(--md-outline);
            border-radius: 8px;
            font-size: 16px;
            background: var(--md-surface);
            transition: all 0.2s;
            outline: none;
        }

        .password-input:focus {
            border-color: var(--md-primary);
        }

        .password-input:focus + .input-label {
            color: var(--md-primary);
        }

        .toggle-visibility {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--md-text-caption);
            cursor: pointer;
            padding: 4px;
            border-radius: 50%;
            transition: all 0.2s;
        }

        .toggle-visibility:hover {
            background-color: rgba(0,0,0,0.04);
        }

        .toggle-visibility .material-icons {
            font-size: 20px;
        }

        .error-message {
            font-size: 12px;
            color: var(--md-error);
            margin-top: 4px;
            display: none;
        }

        .input-error .password-input {
            border-color: var(--md-error);
        }

        .input-error .error-message {
            display: block;
        }

        /* SubmitButton 确认修改按钮 */
        .submit-button {
            width: 100%;
            height: 48px;
            background-color: var(--md-primary);
            color: var(--md-on-primary);
            border: none;
            border-radius: 24px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s;
            margin-top: 8px;
        }

        .submit-button:hover:not(:disabled) {
            background-color: var(--md-primary-dark);
        }

        .submit-button:disabled {
            background-color: var(--md-outline);
            color: var(--md-text-caption);
            cursor: not-allowed;
        }

        /* 响应式设计 */
        @media (max-width: 359px) {
            .password-card {
                padding: 20px 12px;
            }
        }