/* CSS样式与之前相同 */
        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

        :root {
            --primary-color: #000;
            --secondary-color: #fff;
            --accent-color: #e9e9e9;
            --plus-bg-color: #f7f7f7;
            --plus-border-color: #000;
            --text-color: #333;
            --subtle-text-color: #666;
            --button-bg-color: #000;
            --button-text-color: #fff;
            --button-border-color: #000;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--secondary-color);
            color: var(--text-color);
            margin: 0;
            padding: 2rem;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .container {
            max-width: 1380px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 600;
            margin-bottom: 2rem;
        }

        .toggles {
            display: flex;
            align-items: center;
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .plan-toggle {
            display: none;
        }

        .billing-toggle {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            position: relative;
        }

        .billing-toggle label {
            font-size: 1rem;
            color: var(--text-color);
        }

        .billing-toggle .switch {
            position: relative;
            display: inline-block;
            width: 50px;
            height: 28px;
        }

        .billing-toggle .switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .billing-toggle .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: var(--accent-color);
            transition: .4s;
            border-radius: 34px;
        }

        .billing-toggle .slider:before {
            position: absolute;
            content: "";
            height: 20px;
            width: 20px;
            left: 4px;
            bottom: 4px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }

        .billing-toggle input:checked+.slider {
            background-color: var(--primary-color);
        }

        .billing-toggle input:checked+.slider:before {
            transform: translateX(22px);
        }

        .pricing-cards {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            width: 100%;
        }

        .pricing-card {
            background-color: var(--plus-bg-color);
            border: 1px solid var(--accent-color);
            border-radius: 12px;
            padding: 2.5rem;
            display: flex;
            flex-direction: column;
        }

        .pricing-card.plus {
            border-color: var(--plus-border-color);
            background-color: var(--secondary-color);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            position: relative;
        }

        .pricing-card.plus .most-popular {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background-color: #F8F4FF;
            color: #7942C7;
            padding: 4px 12px;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.05em;
        }

        .card-header h2 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
        }

        .card-header .price {
            font-size: 3rem;
            font-weight: 600;
            margin: 0.5rem 0 0.25rem;
        }

        .card-header .billing-info {
            font-size: 0.9rem;
            color: var(--subtle-text-color);
            min-height: 20px;
        }

        .card-header .billing-info .discount {
            color: #a04d9c;
            font-weight: 500;
            margin-left: 0.5rem;
        }

        .card-header .current-plan {
            background-color: var(--accent-color);
            color: var(--subtle-text-color);
            padding: 8px 16px;
            border-radius: 9999px;
            text-align: center;
            font-size: 0.9rem;
            font-weight: 500;
            margin-top: 1rem;
        }

        .pricing-card.free button {
            display: block;
            border-radius: 8px;
        }

        .divider {
            height: 1px;
            background-color: var(--accent-color);
            margin: 2rem 0;
        }

        .card-features {
            flex-grow: 1;
        }

        .card-features ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .card-features li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 1rem;
            font-size: 0.9rem;
            line-height: 1.4;
        }

        .card-features .icon {
            width: 1.25rem;
            height: 1.25rem;
            margin-right: 0.75rem;
            fill: #333;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .card-features .icon.check {
            color: #333;
        }

        .footer-note {
            text-align: center;
            margin-top: 3rem;
            color: var(--subtle-text-color);
            font-size: 0.9rem;
        }

        .footer-note a {
            color: var(--text-color);
            text-decoration: underline;
        }

        /* 新增：Free 按钮的独立样式 */
        .free-button {
            width: 100%;
            padding: 12px;
            margin-top: 20px;
            font-size: 16px;
            font-weight: bold;
            border: 1px solid #007e70;
            /* 定义一个边框，使其可见 */
            border-radius: 8px;
            cursor: pointer;
            text-align: center;
            /* 确保文字居中 */
            text-decoration: none;
            /* 移除链接的下划线 */
            color: #007e70;
            /* 默认文字颜色 */
            background-color: transparent;
            /* 默认背景透明 */
            transition: background-color 0.3s ease, color 0.3s ease;
            display: inline-block;
            /* 确保它像按钮一样显示 */
        }

        .free-button:hover {
            background-color: #05685c;
            /* 悬停时背景变为黑色 */
            color: #fff;
            /* 悬停时文字变为白色 */
        }

        .stripe-checkout-btn {
            width: 100%;
            padding: 12px;
            margin-top: 20px;
            background-color: #635bff;
            /* Stripe 的主题色 */
            color: white;
            font-size: 16px;
            font-weight: bold;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .stripe-checkout-btn:hover {
            background-color: #554cd6;
            /* #05685c */
        }

        .stripe-checkout-btn:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

        @media (max-width: 1024px) {
            .pricing-cards {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .pricing-cards {
                grid-template-columns: 1fr;
            }

            .toggles {
                flex-direction: column;
                gap: 1rem;
            }
        }