 <style>
    /* Global Theming & Variables */
    :root {
        --border-radius-main: 12px;
        --border-main: 1px solid var(--border-color);
        --border-radius-btn: 6px;
        --primary-color: #F8E700;
        --primary-text-color: #000000;
        --bg-color: #F7F8FA;
        --card-bg: #FFFFFF;
        --text-primary: #1C1C1E;
        --text-secondary: #8A8A8E;
        --border-color: #EAEAEA;
        --icon-color: #444444;
        --green-positive: #27AE60;
        --red-negative: #EB5757;
        --blue-neutral: #007AFF;
    }

    .dark-mode {
        --bg-color: #121212;
        --card-bg: #1E1E1E;
        --text-primary: #F1F1F1;
        --text-secondary: #A0A0A0;
        --border-color: #333333;
        --icon-color: #A0A0A0;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }

    body {
        font-family: 'Plus Jakarta Sans', sans-serif;
        background-color: var(--bg-color);
        color: var(--text-primary);
        overscroll-behavior: none;
        transition: background-color 0.3s ease, color 0.3s ease;
    }

    /* App Layout */
    .app-container { display: flex; flex-direction: column; min-height: 100vh; width: 100%; margin: 0 auto; }
    
    /* Mobile Styles */
    .app-header { padding: 16px; padding-top: 45px; background-color: var(--card-bg); border-bottom: var(--border-main); }
    .profile-bar { display: flex; justify-content: space-between; align-items: center; position: relative; }
    .header-main-nav { display: flex; align-items: center; gap: 16px; }
    .back-btn { font-size: 1.6rem; color: var(--text-primary); text-decoration: none; }
    .header-title { font-size: 1.2rem; font-weight: 600; color: var(--text-primary); }
    main { flex-grow: 1; padding: 24px 16px; background-color: var(--bg-color); padding-bottom: 120px; }
    .desktop-sidebar { display: none; }
    
    /* Plan Toggle (Monthly/Yearly) */
    .plan-toggle {
        display: flex;
        justify-content: center;
        margin-bottom: 32px;
        background-color: var(--card-bg);
        border: var(--border-main);
        border-radius: var(--border-radius-btn);
        padding: 4px;
        width: fit-content;
        margin-left: auto;
        margin-right: auto;
    }

    .toggle-btn {
        padding: 8px 16px;
        border: none;
        background-color: transparent;
        color: var(--text-secondary);
        font-weight: 600;
        cursor: pointer;
        border-radius: 4px;
        transition: all 0.2s ease-in-out;
        position: relative;
    }

    .toggle-btn.active {
        background-color: var(--card-bg);
        color: var(--text-primary);
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .toggle-btn .discount-badge {
        position: absolute;
        top: -10px;
        right: -20px;
        background-color: var(--green-positive);
        color: white;
        font-size: 0.7rem;
        padding: 2px 6px;
        border-radius: 10px;
        font-weight: 700;
    }
    
    .plan-list {
        display: flex;
        flex-direction: column;
        gap: 16px;
        margin-bottom: 24px;
    }

    .plan-item {
        background-color: var(--card-bg);
        border: var(--border-main);
        border-radius: var(--border-radius-main);
        padding: 24px;
        position: relative;
        cursor: pointer;
        transition: all 0.2s ease-in-out;
        overflow: hidden; /* To contain badges */
    }
    
    .plan-item:not(.disabled):hover {
        transform: translateY(-4px);
        box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }

    .plan-item:not(.disabled):has(input:checked) {
        border: 2px solid var(--text-primary);
        background-color: var(--bg-color);
        box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    
    /* Disabled Plan Styles */
    .plan-item.disabled {
        filter: grayscale(80%);
        opacity: 0.7;
        cursor: not-allowed;
        pointer-events: none; /* Disables mouse events on the card itself */
    }
    
    .contact-btn {
        background-color: transparent;
        border: 1px solid var(--text-secondary);
        color: var(--text-secondary);
        padding: 8px 12px;
        border-radius: var(--border-radius-btn);
        font-weight: 600;
        font-size: 0.9rem;
        cursor: pointer;
        pointer-events: auto; /* Re-enables mouse events for the button */
        transition: all 0.2s ease;
    }
    
    .contact-btn:hover {
        background-color: var(--text-secondary);
        color: var(--card-bg);
    }

    .popular-badge {
        position: absolute;
        top: 0;
        right: 0;
        background-color: var(--primary-color);
        color: var(--primary-text-color);
        padding: 6px 12px;
        font-size: 0.8rem;
        font-weight: 700;
        border-bottom-left-radius: var(--border-radius-main);
    }
    
    .plan-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 16px;
    }
    
    .plan-header .plan-name-container {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .plan-header .plan-name {
        font-size: 1.2rem;
        font-weight: 600;
        color: var(--text-primary);
    }

    .plan-header .plan-price {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--text-primary);
        white-space: nowrap;
    }
    
    .plan-price .period {
        font-size: 0.9rem;
        font-weight: 400;
        color: var(--text-secondary);
    }

    .plan-details {
        font-size: 0.9rem;
        color: var(--text-secondary);
        margin-bottom: 16px;
    }

    .plan-features {
        list-style: none;
        padding: 0;
        margin-bottom: 24px;
    }

    .plan-features li {
        display: flex;
        align-items: center;
        gap: 8px;
        margin-bottom: 8px;
        font-size: 0.95rem;
        color: var(--text-primary);
    }

    .plan-features i {
        color: var(--green-positive);
        font-size: 1.2rem;
    }

    .plan-item .plan-select-radio {
        position: absolute;
        opacity: 0;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        cursor: pointer;
    }
    
    /* Custom radio button styles */
    .custom-radio {
        width: 20px;
        height: 20px;
        border: 2px solid var(--text-secondary);
        border-radius: 50%;
        position: relative;
        flex-shrink: 0;
    }

    .custom-radio::after {
        content: '';
        width: 10px;
        height: 10px;
        background-color: var(--text-primary);
        border-radius: 50%;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) scale(0);
        transition: transform 0.2s ease-in-out;
    }

    .plan-select-radio:checked ~ .plan-header .plan-name-container .custom-radio::after {
        transform: translate(-50%, -50%) scale(1);
    }
    
    .plan-select-radio:checked ~ .plan-header .plan-name-container .custom-radio {
        border-color: var(--text-primary);
    }

    .subscribe-btn-container {
        padding: 16px;
    }

    .subscribe-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: 100%;
        padding: 16px;
        font-size: 1.1rem;
        font-weight: 600;
        color: var(--card-bg);
        background-color: var(--text-primary);
        border: none;
        border-radius: var(--border-radius-main);
        cursor: pointer;
        transition: opacity 0.2s ease;
    }
    
    .subscribe-btn:hover {
        opacity: 0.9;
    }

    /* Payment Modal Styles */
    .modal-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        display: none;
        place-items: center;
        z-index: 1000;
        padding: 16px;
    }

    .modal-container {
        background-color: var(--card-bg);
        border-radius: var(--border-radius-main);
        padding: 20px;
        width: 95%;
        max-width: 450px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        position: relative;
    }

    .modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 20px;
    }

    .modal-header h2 {
        font-size: 1.2rem;
        font-weight: 600;
    }

    .modal-close-btn {
        background: none;
        border: none;
        color: var(--text-secondary);
        font-size: 1.5rem;
        cursor: pointer;
    }

    .payment-form {
        display: grid;
        gap: 15px;
    }

    .payment-methods {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        margin-bottom: 15px;
    }

    .payment-method {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 15px;
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius-main);
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .payment-method:hover {
        border-color: var(--primary-color);
    }

    .payment-method.selected {
        border-color: var(--primary-color);
        background-color: rgba(248, 231, 0, 0.1);
    }

    .payment-method.disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }

    .payment-method i {
        font-size: 2rem;
        margin-bottom: 8px;
    }

    .payment-method span {
        font-size: 0.9rem;
        font-weight: 600;
    }

    .phone-input-container {
        display: none;
    }

    .phone-input-container.visible {
        display: block;
    }

    .phone-input-container label {
        display: block;
        font-weight: 500;
        margin-bottom: 6px;
        color: var(--text-primary);
        font-size: 0.9rem;
    }

    .phone-input-container input {
        width: 100%;
        padding: 10px;
        border: var(--border-main);
        border-radius: var(--border-radius-btn);
        background-color: var(--bg-color);
        color: var(--text-primary);
        font-family: inherit;
        font-size: 0.9rem;
    }

    .phone-input-container input:focus {
        outline: none;
        border-color: var(--primary-color);
    }

    .phone-example {
        font-size: 0.8rem;
        color: var(--text-secondary);
        margin-top: 5px;
    }

    .form-actions {
        display: flex;
        justify-content: flex-end;
        gap: 10px;
        margin-top: 20px;
    }

    .form-actions button {
        padding: 10px 20px;
        border: none;
        border-radius: var(--border-radius-btn);
        font-weight: 600;
        cursor: pointer;
        transition: opacity 0.2s ease;
        font-size: 0.9rem;
    }

    .form-actions button:hover {
        opacity: 0.85;
    }

    .form-actions .btn-cancel {
        background-color: var(--bg-color);
        color: var(--text-primary);
        border: var(--border-main);
    }

    .form-actions .btn-submit {
        background-color: var(--primary-color);
        color: var(--primary-text-color);
        min-width: 100px;
        position: relative;
    }

    .loading-spinner {
        border: 3px solid rgba(255, 255, 255, 0.3);
        border-top: 3px solid var(--primary-text-color);
        border-radius: 50%;
        width: 20px;
        height: 20px;
        animation: spin 1s linear infinite;
        display: none;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }

    @keyframes spin {
        0% { transform: translate(-50%, -50%) rotate(0deg); }
        100% { transform: translate(-50%, -50%) rotate(360deg); }
    }

    .btn-submit .btn-text {
        visibility: visible;
    }

    .btn-submit.loading .btn-text {
        visibility: hidden;
    }

    .btn-submit.loading .loading-spinner {
        display: block;
    }

    .notification {
        position: fixed;
        top: 20px;
        right: 20px;
        padding: 15px 20px;
        border-radius: var(--border-radius-main);
        z-index: 1000;
        display: flex;
        align-items: center;
        gap: 10px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        max-width: 350px;
    }

    .notification.success {
        background-color: var(--green-positive);
        color: white;
    }

    .notification.error {
        background-color: var(--red-negative);
        color: white;
    }

    .notification i {
        font-size: 1.2rem;
    }

    /* Desktop Styles */
    @media (min-width: 768px) {
        .app-container { flex-direction: row; height: 100vh; background-color: transparent; }
        main { padding-bottom: 32px; }
        .desktop-sidebar { display: flex; flex-direction: column; width: 280px; background-color: var(--card-bg); padding: 24px; border-right: var(--border-main); flex-shrink: 0; }
        .sidebar-profile { position: relative; margin-bottom: 40px; }
        .user-info { display: flex; align-items: center; gap: 12px; cursor: pointer; }
        .user-info .desktop-business-icon { font-size: 2.2rem; color: var(--icon-color); }
        .user-details .name { font-weight: 600; font-size: 1.1rem; }
        .user-details .status { font-size: 0.9rem; color: var(--text-secondary); }
        .sidebar-nav { display: flex; flex-direction: column; gap: 8px; flex-grow: 1; }
        .sidebar-nav .nav-item { display: flex; align-items: center; flex-direction: row; justify-content: flex-start; gap: 16px; font-size: 1rem; padding: 12px; border-radius: var(--border-radius-main); transition: background-color 0.2s ease; color: var(--text-secondary); text-decoration: none; }
        .sidebar-nav .nav-item:hover { background-color: var(--bg-color); }
        .sidebar-nav .nav-item.active { background-color: var(--primary-color); color: var(--primary-text-color); font-weight: 600; }
        .sidebar-nav .nav-item i { font-size: 1.5rem; }
        .desktop-main-content { display: flex; flex-direction: column; flex-grow: 1; overflow-y: auto; }
        .app-header { padding: 24px 32px; background-color: var(--card-bg); border-bottom: var(--border-main); }
        main { padding: 32px; }
        
        .plan-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        
        .subscribe-btn-container {
            position: fixed;
            bottom: 0;
            left: 280px;
            right: 0;
            background-color: var(--card-bg);
            padding: 16px 32px;
            border-top: var(--border-main);
            box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
        }
    }
    </style>