.checkout-page {
    margin: 0 auto;
    max-width: 88rem;
    padding: clamp(2rem, 5vw, 4.5rem) clamp(1rem, 4vw, 3.5rem) 6rem;
}

.checkout-heading {
    align-items: start;
    display: flex;
    gap: 2rem;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.checkout-heading h1 { font-size: clamp(2.7rem, 6vw, 5.8rem); max-width: 13ch; }
.checkout-heading p { max-width: 64ch; }
.checkout-heading > a { border: 1px solid var(--line); border-radius: 999px; padding: 0.7rem 1rem; text-decoration: none; white-space: nowrap; }
.checkout-layout { display: grid; gap: 1.4rem; grid-template-columns: minmax(0, 0.9fr) minmax(24rem, 1.1fr); }
.checkout-order, .checkout-confirm, .checkout-state, .checkout-message { background: var(--surface); border: 1px solid var(--line); border-radius: 1.5rem; box-shadow: var(--shadow); padding: clamp(1.3rem, 3vw, 2rem); }
.checkout-message { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); display: grid; gap: 0.4rem; margin-bottom: 1.3rem; }
.checkout-message span { color: var(--muted); }
.checkout-order h2, .checkout-confirm h2 { font-size: clamp(1.8rem, 4vw, 3rem); margin: 0.8rem 0; }
.checkout-order dl, .order-detail-card dl { display: grid; gap: 0; margin: 1.5rem 0; }
.checkout-order dl div, .order-detail-card dl div { align-items: baseline; border-bottom: 1px solid var(--line); display: flex; gap: 1rem; justify-content: space-between; padding: 0.75rem 0; }
.checkout-order dt, .order-detail-card dt { color: var(--muted); }
.checkout-order dd, .order-detail-card dd { font-weight: 700; margin: 0; overflow-wrap: anywhere; text-align: right; }
.checkout-legal-note { background: color-mix(in srgb, var(--cyan) 8%, transparent); border-left: 3px solid var(--cyan); padding: 1rem; }
.checkout-parties { display: grid; gap: 0.8rem; grid-template-columns: repeat(2, 1fr); }
.checkout-parties div { background: var(--surface-raised); border-radius: 0.9rem; display: grid; gap: 0.35rem; padding: 1rem; }
.checkout-parties span { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; }
.checkout-documents { border-block: 1px solid var(--line); margin: 1.5rem 0; padding: 1.2rem 0; }
.checkout-documents h3 { margin-top: 0; }
.checkout-documents ul { display: grid; gap: 0.55rem; list-style: none; margin: 0; padding: 0; }
.checkout-documents li { align-items: center; display: flex; gap: 1rem; justify-content: space-between; }
.checkout-documents li span { font-size: 0.8rem; }
.checkout-documents .accepted span { color: var(--success); }
.checkout-documents .missing span { color: var(--danger); }
.checkout-form { display: grid; gap: 1rem; }
.checkout-form label { display: grid; gap: 0.4rem; }
.checkout-form label > span { font-weight: 700; }
.checkout-form input, .checkout-form select { background: var(--page-soft); border: 1px solid var(--line); border-radius: 0.7rem; color: var(--text); min-height: 2.9rem; padding: 0.65rem 0.8rem; width: 100%; }
.checkout-form small { color: var(--muted); line-height: 1.45; }
.checkout-form .checkout-check { align-items: start; display: grid; gap: 0.7rem; grid-template-columns: auto 1fr; }
.checkout-form .checkout-check input { min-height: 1.2rem; width: 1.2rem; }
.checkout-form button, .checkout-disabled { background: linear-gradient(135deg, var(--primary), var(--primary-deep)); border: 0; border-radius: 0.8rem; color: white; display: block; font: inherit; font-weight: 800; padding: 0.9rem 1.2rem; text-align: center; width: 100%; }
.checkout-disabled { background: var(--page-soft); border: 1px solid var(--line); color: var(--muted); }

@media (max-width: 64rem) {
    .checkout-layout { grid-template-columns: 1fr; }
}

@media (max-width: 40rem) {
    .checkout-heading { display: grid; }
    .checkout-parties { grid-template-columns: 1fr; }
    .checkout-documents li { align-items: start; flex-direction: column; gap: 0.2rem; }
}