* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    background: #ffffff;
    color: #111827;
}

a {
    text-decoration: none;
}

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-size: 22px;
    font-weight: 800;
    color: #111827;
    letter-spacing: -0.5px;
}

.brand span {
    font-weight: 500;
}

.secure {
    font-size: 13px;
    font-weight: 600;
    color: #475569;
}

.hero {
    padding: 110px 0;
    background:
        linear-gradient(
            135deg,
            #f8fafc,
            #eef2ff
        );
}

.hero-content {
    max-width: 700px;
}

.eyebrow {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.4px;
    margin-bottom: 14px;
    color: #4f46e5;
}

.hero h1 {
    margin: 0;
    font-size: clamp(44px, 7vw, 76px);
    line-height: 0.98;
    letter-spacing: -3px;
}

.hero p {
    max-width: 560px;
    font-size: 19px;
    line-height: 1.6;
    color: #475569;
    margin: 28px 0;
}

.button,
.buy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 54px;
    padding: 0 28px;
    border-radius: 10px;
    background: #111827;
    color: #ffffff;
    font-weight: 750;
}

.features {
    padding: 48px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature {
    padding: 25px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
}

.feature strong {
    display: block;
    margin-bottom: 8px;
}

.feature span {
    font-size: 14px;
    color: #64748b;
}

.product-section {
    padding: 70px 0;
}

.product-grid {
    display: grid;
    grid-template-columns: 1fr 0.85fr;
    gap: 70px;
    align-items: center;
}

.product-media {
    border-radius: 22px;
    overflow: hidden;
    background: #f8fafc;
}

.product-media img {
    width: 100%;
    display: block;
}

.product-info h1 {
    font-size: clamp(36px, 5vw, 58px);
    line-height: 1.05;
    letter-spacing: -2px;
    margin: 0 0 18px;
}

.rating {
    font-size: 17px;
    margin-bottom: 24px;
}

.rating span {
    margin-left: 8px;
    color: #64748b;
    font-size: 14px;
}

.price {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 22px;
}

.currency {
    font-size: 14px;
    vertical-align: top;
    margin-right: 3px;
}

.description {
    color: #475569;
    font-size: 17px;
    line-height: 1.7;
}

.benefits {
    padding: 18px 0;
    line-height: 2;
    font-size: 15px;
}

.buy-button {
    width: 100%;
    font-size: 17px;
    min-height: 60px;
    margin-top: 14px;
}

.payment-note {
    text-align: center;
    color: #64748b;
    font-size: 12px;
    margin-top: 12px;
}

.information {
    padding: 60px 0;
    background: #f8fafc;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 45px;
}

.info-grid h3 {
    margin-top: 0;
}

.info-grid p {
    color: #64748b;
    line-height: 1.6;
}

@media (max-width: 800px) {
    .product-grid,
    .feature-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .product-grid {
        gap: 35px;
    }

    .hero {
        padding: 70px 0;
    }

    .hero h1 {
        letter-spacing: -2px;
    }

    .product-section {
        padding: 35px 0;
    }
}

.checkout-section {
    padding: 55px 0 80px;
    background: #f8fafc;
    min-height: calc(100vh - 72px);
}

.checkout-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 50px;
    align-items: start;
}

.checkout-form-card,
.order-summary {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 18px;
    padding: 34px;
}

.checkout-form-card h1,
.order-summary h2 {
    margin-top: 0;
}

.checkout-form {
    margin-top: 30px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-field {
    margin-bottom: 18px;
}

.form-field label {
    display: block;
    margin-bottom: 7px;
    font-size: 14px;
    font-weight: 650;
}

.form-field input,
.form-field select {
    width: 100%;
    min-height: 48px;
    border: 1px solid #cbd5e1;
    border-radius: 9px;
    padding: 0 13px;
    background: #ffffff;
    font: inherit;
}

.form-field input:focus,
.form-field select:focus {
    outline: 2px solid #4f46e5;
    outline-offset: 1px;
}

.summary-product {
    display: grid;
    grid-template-columns: 82px 1fr;
    gap: 15px;
    align-items: center;
    padding: 18px 0 24px;
    border-bottom: 1px solid #e5e7eb;
}

.summary-product img {
    width: 82px;
    height: 82px;
    object-fit: cover;
    border-radius: 10px;
    background: #f1f5f9;
}

.summary-product span {
    display: block;
    margin-top: 5px;
    color: #64748b;
    font-size: 13px;
}

.summary-line,
.summary-total {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 15px 0;
}

.summary-total {
    border-top: 1px solid #e5e7eb;
    margin-top: 4px;
    font-size: 19px;
}

@media (max-width: 800px) {
    .checkout-grid,
    .form-row {
        grid-template-columns: 1fr;
    }

    .checkout-grid {
        gap: 25px;
    }

    .checkout-form-card,
    .order-summary {
        padding: 22px;
    }
}