:root{color-scheme:dark;--bg:#07101f;--panel:#0f1a2d;--line:#263652;--text:#f7f8fc;--muted:#9ba8bd;--purple:#7c4dff;--green:#43df98}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;background:radial-gradient(circle at 75% 0,rgba(124,77,255,.18),transparent 34%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.checkout-nav{display:flex;align-items:center;justify-content:space-between;max-width:1060px;margin:auto;padding:24px 28px}
.checkout-nav a{color:#c4cee0;text-decoration:none;font-weight:750}
.brand{display:flex;align-items:center;gap:14px}.brand img{width:158px}.brand span{color:#a88bff;font-size:.8rem;font-weight:900;letter-spacing:.12em}
.checkout-shell{display:grid;place-items:center;padding:28px 20px 64px}
.checkout-card{width:min(720px,100%);padding:42px;border:1px solid var(--line);border-radius:24px;background:linear-gradient(150deg,rgba(18,31,52,.98),rgba(10,19,34,.98));box-shadow:0 24px 70px rgba(0,0,0,.28)}
.eyebrow{margin:0 0 8px;color:#a88bff;font-size:.74rem;font-weight:900;letter-spacing:.13em;text-transform:uppercase}
h1{margin:0;font-size:clamp(2.1rem,7vw,3.6rem)}.price{display:flex;align-items:baseline;gap:8px;margin:10px 0 30px}.price strong{font-size:2rem}.price span,.hint,.secure-note{color:var(--muted)}
fieldset{padding:0;border:0}legend{font-size:1.15rem;font-weight:850}.hint{margin:7px 0 18px;font-size:.92rem}
.market-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.market-option{display:flex;align-items:center;gap:12px;padding:17px;border:1px solid var(--line);border-radius:15px;background:#111d31;cursor:pointer}.market-option:has(input:checked){border-color:#9271ff;background:rgba(124,77,255,.15);box-shadow:0 0 0 2px rgba(124,77,255,.12)}.market-option input{width:18px;height:18px;accent-color:var(--purple)}.flag{font-size:1.65rem}.market-option span:last-child{display:flex;flex-direction:column}.market-option small{color:var(--muted);font-size:.7rem}
.all-markets{display:flex;align-items:center;gap:18px;padding:22px;border:1px solid rgba(67,223,152,.3);border-radius:16px;background:rgba(67,223,152,.08)}.all-markets>span{color:var(--green);font-size:2rem}.all-markets div{display:flex;flex-direction:column;gap:4px}.all-markets small{color:var(--muted)}
.secure-note{margin:24px 0 14px;font-size:.85rem;line-height:1.5}button{width:100%;min-height:54px;border:0;border-radius:12px;background:linear-gradient(135deg,#8a5bff,#5e2ee7);color:white;font:inherit;font-weight:900;cursor:pointer}button:hover{filter:brightness(1.08)}
.error{margin:0 0 20px;padding:13px 15px;border:1px solid rgba(255,121,137,.4);border-radius:10px;background:rgba(255,90,111,.1);color:#ffb7c0;font-weight:750}
@media(max-width:620px){.checkout-nav{padding:18px}.brand img{width:130px}.checkout-card{padding:28px 20px;border-radius:18px}.market-grid{grid-template-columns:1fr}.checkout-nav>a:last-child{font-size:.8rem}}