:root {
        --brand-primary: #00ffa3;
        --bg-card: #12161f;
        --border-color: #1e293b;
        --text-muted: #94a3b8;
    }
    .page-header {
        background: #050507;
        border-bottom: 1px solid var(--border-color);
        padding: 4rem 0 3rem;
        text-align: center;
        margin-top: 80px;
    }
    .page-header .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 2rem;
    }
    .page-header h1 {
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 0.75rem;
        color: #fff;
    }
    .page-header p {
        color: var(--text-muted);
        font-size: 1.1rem;
    }
    .checkout-wrapper {
        max-width: 1200px;
        margin: 0 auto;
        padding: 4rem 1rem;
    }
    .checkout-grid {
        display: grid;
        grid-template-columns: 1fr 400px;
        gap: 2rem;
    }
    .checkout-form {
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 2.5rem;
    }
    .checkout-section {
        margin-bottom: 2.5rem;
    }
    .checkout-section h3 {
        font-size: 1.1rem;
        margin-bottom: 1.5rem;
        color: #fff;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .step-num {
        background: var(--brand-primary);
        color: #000;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.8rem;
        font-weight: 700;
    }
    .form-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
    .form-group {
        margin-bottom: 1.5rem;
    }
    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        color: var(--text-muted);
        font-size: 0.9rem;
    }
    .form-control {
        width: 100%;
        background: #050507;
        border: 1px solid var(--border-color);
        color: #fff;
        padding: 0.8rem 1rem;
        border-radius: 6px;
        font-family: inherit;
        font-size: 0.95rem;
    }
    .form-control:focus {
        outline: none;
        border-color: var(--brand-primary);
    }
    .billing-cycle {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    .cycle-option {
        background: rgba(255,255,255,0.03);
        border: 2px solid var(--border-color);
        border-radius: 8px;
        padding: 1rem;
        cursor: pointer;
        transition: 0.2s;
        text-align: center;
    }
    .cycle-option:hover {
        border-color: #555;
    }
    .cycle-option.selected {
        border-color: var(--brand-primary);
        background: rgba(0, 255, 163, 0.05);
    }
    .cycle-option input {
        display: none;
    }
    .cycle-label {
        font-weight: 600;
        color: #fff;
        margin-bottom: 0.3rem;
    }
    .cycle-price {
        color: var(--text-muted);
        font-size: 0.9rem;
    }
    .order-summary {
        background: var(--bg-card);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 2rem;
        position: sticky;
        top: 100px;
        height: fit-content;
    }
    .summary-title {
        font-size: 1.2rem;
        font-weight: 700;
        margin-bottom: 1.5rem;
        color: #fff;
    }
    .summary-item {
        display: flex;
        justify-content: space-between;
        padding: 1rem 0;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .summary-item:last-child {
        border-bottom: none;
    }
    .summary-label {
        color: var(--text-muted);
    }
    .summary-value {
        color: #fff;
        font-weight: 600;
    }
    .summary-total {
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 2px solid var(--border-color);
    }
    .summary-total .summary-label {
        font-size: 1.1rem;
        color: #fff;
    }
    .summary-total .summary-value {
        font-size: 1.5rem;
        color: var(--brand-primary);
    }
    .btn-submit {
        width: 100%;
        background: var(--brand-primary);
        color: #000;
        border: none;
        padding: 1rem;
        border-radius: 6px;
        font-weight: 700;
        font-size: 1rem;
        cursor: pointer;
        margin-top: 1.5rem;
        transition: 0.3s;
    }
    .btn-submit:hover {
        background: #fff;
        box-shadow: 0 0 20px rgba(0,255,163,0.3);
    }
    .plan-badge {
        display: inline-block;
        padding: 4px 10px;
        border-radius: 4px;
        background: rgba(0,255,163,0.1);
        color: var(--brand-primary);
        font-size: 0.75rem;
        font-weight: 700;
        margin-bottom: 1rem;
        text-transform: uppercase;
    }
    .alert-error {
        max-width: 1200px;
        margin: 0 auto 0;
        padding: 0 1rem;
    }
    .alert-error-box {
        background: rgba(255,0,85,0.1);
        border: 1px solid rgba(255,0,85,0.3);
        color: #ff6b8a;
        padding: 1rem;
        border-radius: 6px;
        text-align: center;
        margin-bottom: -2rem;
    }
    .apps-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 0.75rem;
    }
    .app-option {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
        background: rgba(255,255,255,0.03);
        border: 2px solid var(--border-color);
        border-radius: 8px;
        padding: 1rem 0.75rem;
        cursor: pointer;
        transition: 0.2s;
        text-align: center;
    }
    .app-option:hover {
        border-color: #555;
    }
    .app-option.selected {
        border-color: var(--brand-primary);
        background: rgba(0, 255, 163, 0.05);
    }
    .app-option input {
        display: none;
    }
    .app-name {
        color: #fff;
        font-weight: 600;
        font-size: 0.9rem;
    }
    .app-version {
        color: var(--text-muted);
        font-size: 0.75rem;
    }
    .addon-option {
        display: flex;
        align-items: center;
        gap: 1rem;
        background: rgba(255,255,255,0.03);
        border: 2px solid var(--border-color);
        border-radius: 8px;
        padding: 1.25rem;
        cursor: pointer;
        transition: 0.2s;
    }
    .addon-option:hover {
        border-color: #555;
    }
    .addon-option.selected {
        border-color: var(--brand-primary);
        background: rgba(0, 255, 163, 0.05);
    }
    .addon-option input {
        display: none;
    }
    .addon-info {
        flex: 1;
        display: flex;
        flex-direction: column;
        gap: 0.2rem;
    }
    .addon-name {
        color: #fff;
        font-weight: 600;
    }
    .addon-desc {
        color: var(--text-muted);
        font-size: 0.85rem;
    }
    .addon-price {
        color: var(--brand-primary);
        font-weight: 700;
        font-size: 1.1rem;
    }
    @media (max-width: 968px) {
        .checkout-grid {
            grid-template-columns: 1fr;
        }
        .form-row {
            grid-template-columns: 1fr;
        }
        .order-summary {
            position: static;
        }
        .page-header {
            margin-top: 60px;
        }
        .page-header h1 {
            font-size: 2rem;
        }
        .checkout-wrapper {
            padding: 3rem 1rem;
        }
    }