:root{
  --bg:#f5f5f7;
  --surface:#ffffff;
  --ink:#1b1c20;
  --ink-soft:#5c5d64;
  --line:#e2e2e6;
  --accent:#5c5e66;
  --accent-soft:#eceeef;
  --brand:#2f8f5f;
  --brand-soft:#e6f3ec;
  --danger:#c4392f;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0f1016;
    --surface:#181a1e;
    --ink:#f1f1f2;
    --ink-soft:#9a9ba3;
    --line:#2b2c31;
    --accent:#c2c4cc;
    --accent-soft:#24252b;
    --brand:#4cbf8b;
    --brand-soft:#16261e;
    --danger:#e0685e;
  }
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  line-height:1.5;
}

.page{
  min-height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:32px 16px;
}

.checkout-card{
  width:100%;
  max-width:920px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:6px;
  overflow:hidden;
  display:grid;
  grid-template-columns:1.3fr 1fr;
  box-shadow:0 20px 50px -30px rgba(0,0,0,.35);
}
@media(max-width:720px){
  .checkout-card{grid-template-columns:1fr;}
}

.pane-left{padding:36px 34px;}
.pane-right{
  background:linear-gradient(160deg,#4b4d57,#1e1f24 120%);
  padding:34px 28px;
  color:#fff;
  display:flex;
  flex-direction:column;
  gap:20px;
}

.back{font-size:12.5px;color:var(--ink-soft);text-decoration:none;display:inline-block;margin-bottom:18px;}
.back:hover{text-decoration:underline;}
h1{font-size:26px;margin:0 0 6px;letter-spacing:-.01em;}
.tag{color:var(--ink-soft);font-size:13px;margin:0 0 26px;}

.step-h{
  font-size:12px;font-weight:700;color:var(--ink-soft);
  text-transform:uppercase;letter-spacing:.05em;margin:22px 0 12px;
}
.step-h:first-of-type{margin-top:0;}

.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px;}
.field-row.single{grid-template-columns:1fr;}

.field{
  display:block;
  border:1px solid var(--line);
  border-radius:4px;
  padding:9px 12px;
  background:var(--bg);
}
.field b{
  display:block;color:var(--ink);font-size:9.5px;text-transform:uppercase;
  letter-spacing:.05em;font-weight:600;margin-bottom:3px;
}
.field input{
  border:none;background:transparent;outline:none;width:100%;
  font-size:13.5px;color:var(--ink);font-family:inherit;padding:0;
}
.field:focus-within{border-color:var(--brand);}

.field-select{
  display:grid;
  grid-template-columns:auto 1fr;
  align-items:center;
  column-gap:8px;
}
.field-select b{grid-column:1 / -1;}
.select-flag{
  grid-column:1;
  display:flex;
  align-items:center;
  width:20px;height:15px;
  border:1px solid var(--line);
  border-radius:2px;
  overflow:hidden;
  flex-shrink:0;
}
.select-flag img{width:100%;height:100%;object-fit:cover;display:block;}
.field-select select{
  grid-column:2;
  border:none;background:transparent;outline:none;width:100%;
  font-size:13.5px;color:var(--ink);font-family:inherit;padding:0;
  appearance:none;-webkit-appearance:none;cursor:pointer;
}

.phone-row{
  display:flex;
  align-items:center;
  gap:6px;
}
.phone-row select{
  border:none;background:transparent;outline:none;
  font-size:13.5px;color:var(--ink);font-family:inherit;padding:0;
  appearance:none;-webkit-appearance:none;cursor:pointer;
  max-width:56px;
}
.phone-row input{
  flex:1;min-width:0;
  border:none;background:transparent;outline:none;
  font-size:13.5px;color:var(--ink);font-family:inherit;padding:0;
}

.cvv-wrap{display:flex;align-items:center;gap:6px;}
.cvv-wrap input{flex:1;}
.cvv-toggle{
  border:none;background:none;color:var(--ink-soft);cursor:pointer;
  padding:0;display:flex;align-items:center;
}
.cvv-toggle:hover{color:var(--ink);}

.acct-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;}
.acct{
  position:relative;
  border:1.5px solid var(--line);border-radius:4px;padding:14px 10px;
  text-align:center;font-size:12.5px;cursor:pointer;
}
.acct input{position:absolute;opacity:0;pointer-events:none;}
.acct.sel{border-color:var(--brand);background:var(--brand-soft);}
.acct .name{font-weight:700;font-size:13px;margin-bottom:4px;}
.acct .price{color:var(--brand);font-weight:700;font-size:15px;}

.pay-row{display:flex;gap:10px;margin-top:6px;margin-bottom:14px;}
.pay-opt{
  flex:1;border:1.5px solid var(--line);border-radius:4px;padding:10px;
  text-align:center;font-size:12.5px;font-weight:600;
}
.pay-opt.active{background:var(--brand);color:#fff;border-color:var(--brand);}

.pay-btn{
  display:block;
  margin-top:20px;width:100%;background:var(--brand);color:#fff;border:none;border-radius:4px;
  padding:14px;font-size:14.5px;font-weight:700;text-align:center;cursor:pointer;
  text-decoration:none;
}
.pay-btn:disabled{opacity:.6;cursor:not-allowed;}
.pay-btn:not(:disabled):hover{filter:brightness(1.06);}

.resend-btn{
  display:block;width:100%;margin-top:10px;background:none;border:none;
  color:var(--ink-soft);font-size:12.5px;cursor:pointer;padding:6px;
}
.resend-btn:not(:disabled):hover{color:var(--brand);}
.resend-btn:disabled{opacity:.5;cursor:not-allowed;}

.form-error{color:var(--danger);font-size:12.5px;margin:10px 0 0;}

/* Right pane */
.card-visual{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);
  border-radius:5px;padding:18px;font-size:13px;
}
.card-visual .chip{width:30px;height:22px;border-radius:2px;background:rgba(255,255,255,.35);margin-bottom:26px;}
.card-visual .num{letter-spacing:.12em;font-size:15px;margin-bottom:14px;}
.card-bottom{display:flex;justify-content:space-between;font-size:11.5px;opacity:.85;}

.summary-row{display:flex;justify-content:space-between;font-size:13px;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.14);}
.summary-row.total{font-size:17px;font-weight:700;border-bottom:none;padding-top:14px;}

/* Modals */
.modal-backdrop{
  position:fixed;inset:0;background:rgba(10,10,12,.5);
  display:flex;align-items:center;justify-content:center;padding:16px;z-index:10;
}
.modal-backdrop[hidden]{display:none;}
.otp-box{
  background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:28px;
  max-width:340px;width:100%;text-align:center;
}
.otp-box h4{margin:14px 0 6px;font-size:17px;}
.otp-box p{color:var(--ink-soft);font-size:13px;margin:0 0 20px;}
.otp-digits{display:flex;gap:8px;justify-content:center;margin-bottom:16px;}
.otp-digits input{
  width:38px;height:46px;border:1.5px solid var(--line);border-radius:3px;
  text-align:center;font-size:18px;font-weight:700;color:var(--ink);
  background:var(--bg);outline:none;font-family:inherit;
}
.otp-digits input:focus{border-color:var(--brand);}
.otp-timer{font-size:12px;color:var(--ink-soft);margin-bottom:16px;}

.check-mark{
  width:44px;height:44px;border-radius:4px;border:1.5px solid var(--brand);
  color:var(--brand);display:flex;align-items:center;justify-content:center;
  font-size:22px;margin:0 auto 14px;
}
.success-box{max-width:420px;}
.success-box p{text-align:left;}
.success-box .pay-btn{margin-top:8px;}