.checkout { padding-bottom: 4rem; }
.checkout h1 { font-family: var(--font-display); margin: 2rem 0 1rem; }

.layout { display: grid; gap: 1.25rem; }
@media (min-width: 900px) {
  .layout { grid-template-columns: 1fr 360px; align-items: start; }
  .col-summary { position: sticky; top: 5rem; }
}

.col-form { display: grid; gap: 1.25rem; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; display: grid; gap: 0.9rem; }
.panel h2 { margin: 0; font-size: 1.05rem; }

.field { display: grid; gap: 0.3rem; font-size: 0.9rem; }
.field input, .field select, .field textarea {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
.field input[aria-invalid="true"], .field select[aria-invalid="true"] { border-color: var(--accent); }
.two { display: grid; gap: 0.75rem; grid-template-columns: 1fr; }
@media (min-width: 560px) { .two { grid-template-columns: 1fr 1fr; } }

.error { margin: 0; min-height: 0; font-size: 0.8rem; color: var(--accent); }
.error:empty { display: none; }

.pay-methods { border: 0; padding: 0; margin: 0; }
.pay-option { display: flex; gap: 0.5rem; align-items: center; padding: 0.7rem 0.9rem; border: 1px solid var(--ink); border-radius: 10px; }
.gcash-box { display: grid; gap: 0.9rem; justify-items: center; text-align: center; }
.gcash-box .field { width: 100%; text-align: left; }
.qr { width: 260px; max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); background: #fff; }
.pay-line { margin: 0; font-size: 1.05rem; }

.sum-lines { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; font-size: 0.9rem; }
.sum-lines li { display: flex; justify-content: space-between; gap: 1rem; }
.sum-row { display: flex; justify-content: space-between; gap: 1rem; }
.sum-total { font-size: 1.15rem; border-top: 1px solid var(--line); padding-top: 0.75rem; }

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.phone-wrap { display: flex; align-items: stretch; border: 1px solid var(--line); border-radius: 10px; background: #fff; overflow: hidden; }
.phone-prefix { display: grid; place-items: center; padding: 0 0.75rem; background: var(--bg); border-right: 1px solid var(--line); color: var(--muted); }
.field .phone-wrap input { border: 0; border-radius: 0; }
.phone-wrap:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.phone-wrap:has(input[aria-invalid="true"]) { border-color: var(--accent); }

.done { max-width: 520px; margin: 3rem auto; display: grid; gap: 1rem; text-align: center; }
.done h1 { margin: 0; }
.done p { margin: 0; }
.done-code { font-family: ui-monospace, Consolas, monospace; font-size: 1.6rem; letter-spacing: 0.08em; padding: 1rem; border: 1px dashed var(--ink); border-radius: var(--radius); background: var(--surface); overflow-wrap: anywhere; }
.done-warn { padding: 0.75rem 1rem; border: 1px solid var(--accent); border-radius: 10px; color: var(--accent); }
.row-btns { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

.agree { display: flex; gap: 0.5rem; align-items: flex-start; font-size: 0.85rem; }
.agree input { margin-top: 0.2rem; }