/* Checkout: the three steps of buying (thông tin đơn hàng, chuyển khoản, nhận khóa). Loaded by /mua and /don-hang only.
   One working column with a sticky order summary beside it; a card only around each thing the buyer acts on. */

/* ---------- Steps ---------- */
.co-top { background: var(--paper); border-bottom: 1px solid var(--line); }
.co-top .wrap { padding-block: 18px; }
.co-steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.co-step { display: flex; align-items: center; gap: 12px; padding-right: 14px; min-width: 0; }
.co-step:last-child { padding-right: 0; }
.co-step:not(:last-child)::after { content: ""; flex: 1 1 24px; min-width: 16px; height: 2px; border-radius: 2px; background: var(--line); }
.co-step.is-done:not(:last-child)::after { background: var(--sugg-line); }
.co-step-dot {
  flex: none; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  border: 1.5px solid var(--line-2); background: var(--paper); color: var(--ink-3); font-weight: 700; font-size: 14px;
}
.co-step-text { display: grid; gap: 1px; min-width: 0; }
.co-step-text b { font-size: 14.5px; font-weight: 600; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.co-step-text span { font-size: 12.5px; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.co-step.is-current .co-step-dot { background: var(--accent); border-color: var(--accent); color: var(--paper); box-shadow: 0 0 0 4px var(--sel); }
.co-step.is-current .co-step-text b { color: var(--ink); }
.co-step.is-done .co-step-dot { background: var(--sugg-tint); border-color: var(--sugg-line); color: var(--sugg); }
.co-step.is-done .co-step-text b { color: var(--sugg-ink); }
@media (max-width: 700px) {
  .co-step-text span { display: none; }
  .co-step { gap: 8px; padding-right: 8px; }
  .co-step-dot { width: 28px; height: 28px; font-size: 13px; }
}
@media (max-width: 520px) {
  .co-steps { display: flex; }
  .co-step { flex: 1 1 0; }
  .co-step.is-current { flex: 3.2 1 0; }
  .co-step:not(.is-current) .co-step-text { display: none; }
}

/* ---------- Layout ---------- */
.co { display: grid; gap: 28px; padding-block: 28px 72px; }
@media (min-width: 980px) {
  .co { grid-template-columns: minmax(0, 1fr) 350px; gap: 36px; align-items: start; }
  .co-aside { position: sticky; top: calc(var(--header-h) + 20px); }
}
.co-main { display: grid; gap: 20px; min-width: 0; }
.co-head { display: grid; gap: 8px; }
.co-head h1 { font-size: clamp(26px, 3.2vw, 34px); text-wrap: balance; }
.co-head p { font-size: 16.5px; max-width: 62ch; }
.co-form { display: grid; gap: 20px; }

.co-card { display: grid; gap: 18px; padding: 24px; background: var(--paper); border: 1px solid var(--line); border-radius: var(--r2); box-shadow: var(--shadow-card); min-width: 0; }
@media (max-width: 520px) { .co-card { padding: 18px; } }
.co-card-head { display: flex; gap: 14px; align-items: flex-start; }
.co-card-head > div { display: grid; gap: 2px; min-width: 0; }
.co-card-head h2 { font-size: 19px; }
.co-num {
  flex: none; display: grid; place-items: center; width: 28px; height: 28px; margin-top: 1px; border-radius: 50%;
  background: var(--accent-tint); color: var(--accent-2); font-weight: 700; font-size: 14px;
}

/* ---------- Step 1: plans ---------- */
.plan-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding-top: 8px; }
@media (min-width: 620px) { .plan-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.plan-tile {
  position: relative; display: grid; gap: 3px; align-content: start; padding: 16px 14px 14px; border: 1.5px solid var(--line-2);
  border-radius: var(--r2); background: var(--paper); cursor: pointer;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease), background-color .15s var(--ease);
}
.plan-tile:hover { border-color: var(--line-3); }
.plan-tile input { position: absolute; opacity: 0; pointer-events: none; }
.plan-tile:has(input:checked) { border-color: var(--accent); background: var(--accent-tint); box-shadow: 0 0 0 3px var(--sel); }
.plan-tile:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.plan-tile-name { font-weight: 700; font-size: 15px; color: var(--ink); padding-right: 24px; }
.plan-tile-price { font-size: 21px; font-weight: 800; color: var(--ink); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.plan-tile-sub { font-size: 13px; color: var(--ink-3); }
.plan-tile-tag { position: absolute; top: -11px; left: 12px; }
.plan-tile-check {
  position: absolute; top: 14px; right: 12px; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%;
  border: 1.5px solid var(--line-2); background: var(--paper); color: transparent;
}
.plan-tile:has(input:checked) .plan-tile-check { background: var(--accent); border-color: var(--accent); color: var(--paper); }

.co-submit { width: 100%; justify-content: center; min-height: 52px; font-size: 16.5px; }
.co-secure { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; color: var(--ink-3); }
.co-secure .ic { color: var(--sugg); flex: none; margin-top: 2px; }

/* ---------- Summary ---------- */
.co-aside { display: grid; gap: 14px; min-width: 0; align-content: start; }
.co-summary { display: grid; gap: 16px; padding: 22px; border: 1px solid var(--line); border-radius: var(--r2); background: var(--paper); box-shadow: var(--shadow-card); }
.co-sum-head { display: flex; gap: 12px; align-items: center; justify-content: space-between; }
.co-sum-plan { display: flex; gap: 12px; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.co-sum-plan > div { display: grid; gap: 2px; min-width: 0; }
.co-sum-plan b { font-size: 16.5px; }
.co-sum-icon { flex: none; display: grid; place-items: center; width: 42px; height: 42px; border-radius: var(--r2); background: var(--rail); color: var(--paper); }
.co-perks { list-style: none; padding: 16px 0 0; margin: 0; border-top: 1px solid var(--line); display: grid; gap: 10px; font-size: 14px; color: var(--ink-2); }
.co-perks li { display: flex; gap: 10px; align-items: flex-start; }
.co-perks .ic { color: var(--sugg); flex: none; margin-top: 2px; }
.co-help { display: flex; gap: 10px; align-items: flex-start; padding: 14px 16px; border: 1px dashed var(--line-2); border-radius: var(--r2); font-size: 14px; color: var(--ink-2); }
.co-help .ic { color: var(--accent); flex: none; margin-top: 2px; }

/* ---------- Step 2: transfer ---------- */
.co-pay { gap: 22px; }
@media (min-width: 700px) { .co-pay { grid-template-columns: 250px minmax(0, 1fr); align-items: start; } }
.co-qr {
  display: grid; justify-items: center; gap: 12px; padding: 18px 16px 16px; text-align: center;
  border: 1px solid var(--accent-line); border-radius: var(--r2); background: linear-gradient(180deg, var(--accent-tint), var(--paper) 70%);
}
.co-qr-brand { display: inline-flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 700; letter-spacing: .08em; color: var(--accent-2); }
.co-qr-frame { position: relative; padding: 10px; border-radius: var(--r2); background: #FFFFFF; box-shadow: var(--shadow-pop); }
.co-qr-frame img { display: block; width: 196px; height: 196px; image-rendering: pixelated; }
.co-qr-frame::after {
  content: ""; position: absolute; inset: -7px; pointer-events: none;
  background:
    linear-gradient(var(--accent), var(--accent)) top left / 22px 3px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top left / 3px 22px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 22px 3px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 3px 22px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 22px 3px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 3px 22px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 22px 3px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 3px 22px no-repeat;
}
.co-qr-frame .stamp { top: 46%; }
.co-qr-amount { display: grid; gap: 0; }
.co-qr-amount span { font-size: 12.5px; color: var(--ink-3); }
.co-qr-amount b { font-size: 24px; font-weight: 800; color: var(--ink); font-variant-numeric: tabular-nums; }
.co-bank { display: grid; gap: 12px; min-width: 0; align-content: start; }
.co-bank .copy-list .is-must { background: var(--warn-tint); border-radius: 0 0 var(--r2) var(--r2); }
.co-must { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; border: 1px solid var(--warn-line); border-radius: var(--r); background: var(--warn-tint); color: var(--warn-ink); font-size: 14px; }
.co-must .ic { flex: none; margin-top: 2px; }

.co-wait-head { display: flex; gap: 14px; align-items: flex-start; }
.co-wait-head > div { display: grid; gap: 2px; min-width: 0; }
.co-wait-head b { font-size: 17px; }
.co-pulse { position: relative; flex: none; width: 14px; height: 14px; margin: 5px 4px 0; border-radius: 50%; background: var(--warn); }
.co-pulse::after { content: ""; position: absolute; inset: -6px; border: 2px solid var(--warn); border-radius: 50%; opacity: 0; animation: co-ring 1.8s var(--ease) infinite; }
@keyframes co-ring { 0% { transform: scale(.55); opacity: .75; } 100% { transform: scale(1.55); opacity: 0; } }
.co-howto { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; counter-reset: co-step; }
.co-howto li { counter-increment: co-step; display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: 10px; font-size: 15px; color: var(--ink-2); }
.co-howto li::before {
  content: counter(co-step); display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%;
  background: var(--paper-3); color: var(--ink-2); font-size: 13px; font-weight: 700;
}
.co-fallback { display: grid; gap: 10px; padding-top: 16px; border-top: 1px solid var(--line); }

/* ---------- Step 3: the key ---------- */
.co-success { display: grid; justify-items: start; gap: 10px; }
.co-success-mark {
  display: grid; place-items: center; width: 60px; height: 60px; margin-bottom: 4px; border-radius: 50%;
  background: var(--sugg); color: var(--paper); box-shadow: 0 0 0 8px var(--sugg-tint); animation: co-pop .55s var(--ease) both;
}
@keyframes co-pop { 0% { transform: scale(.4); opacity: 0; } 70% { transform: scale(1.08); opacity: 1; } 100% { transform: scale(1); } }
.co-success h1 { font-size: clamp(28px, 3.6vw, 38px); text-wrap: balance; }
.co-success p { font-size: 16.5px; }
.co-key { border-color: var(--accent-line); background: linear-gradient(180deg, var(--accent-tint) 0, var(--paper) 140px); }
.co-key-head { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; justify-content: space-between; }
.co-key-box {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; padding: 16px 18px;
  border: 1.5px dashed var(--accent-line); border-radius: var(--r2); background: var(--paper);
}
.co-key-box code { font: 700 clamp(17px, 2.6vw, 23px)/1.25 var(--font-mono); letter-spacing: .05em; color: var(--accent-2); overflow-wrap: anywhere; }
.co-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.co-chip { display: inline-block; padding: 5px 12px; border: 1px solid var(--line); border-radius: 16px; background: var(--paper-2); font-size: 13.5px; line-height: 1.45; color: var(--ink-3); }
.co-chip b { margin-left: 4px; color: var(--ink); font-weight: 600; }
.co-next-head { display: grid; gap: 4px; }
.co-next-head h2 { font-size: 21px; }
.co-next { display: grid; gap: 12px; }
@media (min-width: 720px) { .co-next { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.co-next article { display: grid; gap: 8px; align-content: start; padding: 18px; border: 1px solid var(--line); border-radius: var(--r2); background: var(--paper); }
.co-next-icon { display: grid; place-items: center; width: 38px; height: 38px; border-radius: var(--r); background: var(--accent-tint); color: var(--accent-2); }
.co-next h3 { font-size: 16px; }
.co-next p { font-size: 14px; color: var(--ink-2); }
.co-next .btn { justify-self: start; margin-top: 2px; }

@media (prefers-reduced-motion: reduce) {
  :root:not([data-motion="on"]) .co-pulse::after,
  :root:not([data-motion="on"]) .co-success-mark { animation: none; }
  :root:not([data-motion="on"]) .plan-tile { transition: none; }
}