*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,sans-serif;background:#f5f6f8;color:#17191c}.shell{max-width:1180px;margin:auto;padding:0 24px}.topbar{padding:8px 24px;text-align:center;background:#111827;color:white;font-size:12px}.header{background:white;border-bottom:1px solid #e6e8eb}.header-row{height:72px;display:flex;align-items:center;gap:22px}.logo{font-weight:900;font-size:23px}.search{flex:1;padding:13px 16px;border:1px solid #d9dde3;border-radius:12px}.secure{font-size:13px;font-weight:800}.crumbs{font-size:13px;color:#667085;padding:20px 0 8px}.page-title{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin:10px 0 24px}.page-title h1{font-size:38px;margin:4px 0}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.11em;font-weight:800;color:#667085}.badge{display:inline-flex;padding:7px 10px;border:1px solid #dfe3e8;background:white;border-radius:999px;font-size:12px}.checkout-grid{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:22px;align-items:start}.card{background:white;border:1px solid #e1e4e8;border-radius:18px;box-shadow:0 8px 28px rgba(17,24,39,.05)}.flow{padding:22px}.step{padding:18px 0;border-bottom:1px solid #edf0f2}.step:last-child{border:0}.step h2{font-size:18px;margin:0 0 10px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.input,.select{width:100%;padding:12px 13px;border:1px solid #d8dde4;border-radius:11px;background:white}.option-row{display:flex;gap:10px;flex-wrap:wrap}.option{padding:10px 12px;border:1px solid #d8dde4;border-radius:11px;background:white}.option[aria-pressed=true]{border-color:#111827;box-shadow:0 0 0 1px #111827}.summary{padding:22px;position:sticky;top:18px}.summary h2{margin-top:0}.row{display:flex;justify-content:space-between;gap:16px;padding:9px 0}.total{font-size:20px;font-weight:900;border-top:1px solid #e5e7eb;margin-top:8px;padding-top:15px}.notice,.state{font-size:12px;color:#667085;background:#f7f8fa;border-radius:10px;padding:10px;margin:10px 0}.btn{width:100%;border:0;border-radius:12px;padding:13px 16px;font-weight:850;cursor:pointer}.primary{background:#111827;color:#fff}.secondary{background:#eef1f4;color:#111827}.checks{display:flex;gap:8px;align-items:flex-start;margin:10px 0;font-size:13px}.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}.trust .card{padding:16px}.details{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.details .card{padding:18px}footer{margin-top:34px;background:#111827;color:white;padding:30px 0}.footer-row{display:flex;justify-content:space-between;gap:20px}.muted{color:#667085}@media(max-width:900px){.checkout-grid{grid-template-columns:1fr}.summary{position:static}.trust,.details{grid-template-columns:1fr 1fr}}@media(max-width:620px){.shell{padding:0 15px}.header-row{height:auto;padding:14px 0;flex-wrap:wrap}.search{order:3;flex-basis:100%}.page-title{display:block}.page-title h1{font-size:31px}.grid2,.trust,.details{grid-template-columns:1fr}.checkout-grid{gap:14px}}:focus-visible{outline:3px solid currentColor;outline-offset:3px}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* Stage 2 — Design-System Parity */
.logo-wrap{display:flex;align-items:baseline;gap:8px}.logo-sub{font-size:10px;letter-spacing:.14em;color:#667085;font-weight:800}.checkout-progress{list-style:none;margin:0 0 22px;padding:0;display:flex;align-items:center;gap:0;background:#fff;border:1px solid #e1e4e8;border-radius:14px;overflow:hidden}.checkout-progress li{flex:1;padding:12px 14px;text-align:center;font-size:12px;font-weight:750;color:#98a2b3;position:relative}.checkout-progress li+li:before{content:"";position:absolute;left:0;top:25%;height:50%;width:1px;background:#e5e7eb}.checkout-progress .done{color:#344054;background:#f8fafc}.checkout-progress .active{color:#111827;background:#eef2f7}.premium-badge{font-weight:800}.premium-flow{padding:8px 24px}.step{padding:22px 0}.step-head{display:flex;align-items:flex-start;gap:12px;margin-bottom:14px}.step-head h2{margin:0 0 3px}.step-head p{margin:0;color:#667085;font-size:13px}.step-index{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:#111827;color:#fff;font-weight:900;font-size:12px;flex:none}.step-status{margin-left:auto;border:1px solid #e4e7ec;background:#f9fafb;border-radius:999px;padding:5px 8px;font-size:10px;font-weight:800;color:#475467}.input,.select{min-height:46px;transition:border-color .15s ease,box-shadow .15s ease}.input:hover,.select:hover{border-color:#98a2b3}.input:focus,.select:focus{border-color:#667085;box-shadow:0 0 0 3px rgba(102,112,133,.12);outline:0}.option{min-height:44px;font-weight:750;transition:transform .15s ease,box-shadow .15s ease}.option:hover{transform:translateY(-1px);box-shadow:0 5px 14px rgba(17,24,39,.07)}.premium-summary{border-color:#d0d5dd;box-shadow:0 18px 42px rgba(17,24,39,.09)}.summary-kicker{font-size:10px;letter-spacing:.13em;font-weight:900;color:#667085;margin-bottom:5px}.summary-item{display:grid;grid-template-columns:38px 1fr auto;gap:10px;align-items:center;background:#f8fafc;padding:10px;border-radius:12px;margin:12px 0}.summary-item .thumb{width:38px;height:38px;border-radius:9px;background:#e9edf2;display:grid;place-items:center;font-size:10px;font-weight:900}.summary-item small,.risk-card small{display:block;color:#667085;margin-top:2px}.risk-card{display:flex;gap:10px;align-items:flex-start;background:#f7f9fb;border:1px solid #e4e7ec;border-radius:12px;padding:12px;margin:12px 0;font-size:12px}.risk-icon{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:#111827;color:#fff;font-weight:900}.authorize-premium{display:flex;justify-content:center;gap:10px;align-items:center;min-height:48px;box-shadow:0 8px 18px rgba(17,24,39,.18)}.premium-trust .card{min-height:92px;display:flex;flex-direction:column;justify-content:center}.card{transition:box-shadow .18s ease,border-color .18s ease}.card:hover{border-color:#d0d5dd}.state{border:1px solid #eaecf0}@media(max-width:900px){.checkout-progress li{font-size:11px;padding:10px 6px}.premium-summary{position:static}}@media(max-width:620px){.checkout-progress{display:grid;grid-template-columns:1fr 1fr}.checkout-progress li+li:before{display:none}.step-head{flex-wrap:wrap}.step-status{margin-left:40px}.premium-flow{padding:6px 16px}.summary-item{grid-template-columns:38px 1fr}.summary-item>strong{grid-column:2}}

/* Stage 3 — Customer, Delivery & Billing Configuration */
.configuration-band{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:4px 0 16px}.config-chip{border:1px solid #e4e7ec;background:#f8fafc;border-radius:12px;padding:10px;display:flex;flex-direction:column;gap:3px}.config-chip strong{font-size:11px}.config-chip span{font-size:10px;color:#667085}.configuration-stage3{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:22px 0}.config-card{padding:18px}.config-card h2{margin:5px 0 8px;font-size:18px}.validation-list{display:grid;gap:8px}.validation-list span{padding:9px 10px;background:#f8fafc;border:1px solid #eaecf0;border-radius:10px;font-size:12px}.config-summary{grid-column:1/-1}.config-summary dl{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:10px 0 0}.config-summary dl div{background:#f8fafc;border-radius:10px;padding:10px}.config-summary dt{font-size:10px;color:#667085;text-transform:uppercase;font-weight:800}.config-summary dd{margin:4px 0 0;font-weight:800;font-size:12px}@media(max-width:900px){.configuration-band{grid-template-columns:1fr 1fr}.configuration-stage3{grid-template-columns:1fr}.config-summary{grid-column:auto}.config-summary dl{grid-template-columns:1fr 1fr}}@media(max-width:620px){.configuration-band,.config-summary dl{grid-template-columns:1fr}}

.conversion-stage4{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:24px 0}.conversion-stage4 .config-card{min-height:190px}@media(max-width:900px){.conversion-stage4{grid-template-columns:1fr 1fr}}@media(max-width:620px){.conversion-stage4{grid-template-columns:1fr}}

/* Stage 5 — Trust, Risk & Personalization */
.trust-personalization-stage5{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:24px 0}.trust-personalization-stage5 .config-card{min-height:190px}.trust-personalization-stage5 .badge{margin-top:8px}@media(max-width:900px){.trust-personalization-stage5{grid-template-columns:1fr 1fr}}@media(max-width:620px){.trust-personalization-stage5{grid-template-columns:1fr}}

.checkout-boundary-card{margin-top:22px}.boundary-toggle{width:100%;display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border:1px solid #d8dde4;border-radius:12px;background:#fff;font-weight:800;cursor:pointer}.boundary-detail{margin-top:8px;padding:14px 16px;border:1px solid #e1e4e8;border-radius:12px;background:#f7f8fa;color:#667085;font-size:13px}