:root,
[data-theme="light"] {
  --pay-bg: #eaf2f6;
  --pay-surface: #ffffff;
  --pay-soft: #f4f9fb;
  --pay-text: #0b3b50;
  --pay-muted: #587583;
  --pay-border: #d5e5ec;
  --pay-primary: #06778d;
  --pay-primary-bright: #10b8cf;
  --pay-deep: #06374f;
  --pay-success: #13744a;
  --pay-warning: #8a5a00;
  --pay-shadow: rgb(6 55 79 / 18%);
}

[data-theme="dark"] {
  --pay-bg: #061720;
  --pay-surface: #0b2532;
  --pay-soft: #102f3d;
  --pay-text: #e9fbff;
  --pay-muted: #adc3cc;
  --pay-border: #214758;
  --pay-primary: #72eaff;
  --pay-primary-bright: #25d7ed;
  --pay-deep: #e9fbff;
  --pay-success: #79dda9;
  --pay-warning: #ffd176;
  --pay-shadow: rgb(0 0 0 / 38%);
}

* { box-sizing: border-box; }

button { font: inherit; }

.demo-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.demo-copy { max-width: 560px; text-align: center; }
.demo-mark { display: inline-grid; width: 64px; height: 64px; margin-bottom: 18px; color: white; background: var(--pay-deep); border-radius: 18px; place-items: center; font-size: 24px; }
.demo-copy h1 { margin: 0 0 12px; color: var(--pay-deep); font-size: 34px; line-height: 1.12; }
.demo-copy p { margin: 0 auto 24px; max-width: 54ch; color: var(--pay-muted); line-height: 1.65; }

.payment-modal {
  width: min(920px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 0;
  color: var(--pay-text);
  background: var(--pay-surface);
  border: 1px solid var(--pay-border);
  border-radius: 22px;
  box-shadow: 0 24px 80px var(--pay-shadow);
  overflow: hidden;
  margin: auto;
}

.payment-modal::backdrop { background: rgb(2 25 35 / 64%); }
.payment-modal[open] { animation: modal-enter 220ms cubic-bezier(.22, 1, .36, 1); }
.payment-shell { display: flex; max-height: calc(100dvh - 32px); flex-direction: column; }

.payment-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 18px 24px 18px;
  border-bottom: 1px solid var(--pay-border);
}

.payment-brand { margin: 0; color: var(--pay-primary); font-size: 12px; font-weight: 800; }
.payment-header h2 { margin: 0; color: var(--pay-deep); font-size: 22px; line-height: 1.25; }
.icon-button { display: grid; width: 42px; height: 42px; color: var(--pay-muted); background: transparent; border: 0; border-radius: 50%; cursor: pointer; place-items: center; }
.icon-button:hover { color: var(--pay-text); background: var(--pay-soft); }

.payment-steps { display: flex; align-items: center; padding: 12px 24px; background: var(--pay-soft); }
.payment-step { display: flex; align-items: center; gap: 8px; color: var(--pay-muted); font-size: 13px; }
.payment-step span { display: grid; width: 28px; height: 28px; border: 1px solid var(--pay-border); border-radius: 50%; place-items: center; font-weight: 600; }
.payment-step.is-active { color: var(--pay-primary); }
.payment-step.is-active span { color: white; background: var(--pay-primary); border-color: var(--pay-primary); }
.payment-step.is-complete span { color: white; background: var(--pay-success); border-color: var(--pay-success); }
.step-line { width: 48px; height: 1px; margin: 0 12px; background: var(--pay-border); }

.payment-body { min-height: 0; padding: 16px 24px; overflow-y: auto; scrollbar-width: none; }
.payment-body::-webkit-scrollbar { display: none; }
.section-heading { margin-bottom: 18px; }
.section-heading h3 { margin: 0 0 6px; color: var(--pay-deep); font-size: 19px; }
.section-heading p { margin: 0; color: var(--pay-muted); font-size: 14px; line-height: 1.5; }

.plan-grid { display: grid; margin: 0; padding: 0; border: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.plan-option { position: relative; min-width: 0; cursor: pointer; }
.plan-option input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.plan-content { position: relative; display: flex; min-height: 142px; padding: 18px; background: var(--pay-surface); border: 1px solid var(--pay-border); border-radius: 16px; flex-direction: column; overflow: hidden; transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease; }
.plan-option:hover .plan-content { border-color: var(--pay-primary-bright); transform: translateY(-1px); }
.plan-option input:checked + .plan-content { background: color-mix(in srgb, var(--pay-primary-bright) 7%, var(--pay-surface)); border: 2px solid var(--pay-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--pay-primary-bright) 16%, transparent); }
.plan-option input:focus-visible + .plan-content { outline: 3px solid color-mix(in srgb, var(--pay-primary-bright) 28%, transparent); outline-offset: 2px; }
.plan-period { color: var(--pay-deep); font-size: 20px; font-weight: 600; }
.plan-bonus { margin-top: 6px; color: var(--pay-success); font-size: 13px; font-weight: 600; }
.old-price { margin-top: auto; color: var(--pay-muted); font-size: 13px; text-decoration: line-through; }
.plan-content strong { margin-top: auto; color: var(--pay-text); font-size: 22px; }
.old-price + strong { margin-top: 2px; }
.discount { position: absolute; top: 12px; right: 12px; padding: 4px 8px; color: var(--pay-primary); background: color-mix(in srgb, var(--pay-primary-bright) 12%, var(--pay-surface)); border-radius: 999px; font-size: 11px; font-weight: 600; }

.payment-note { display: flex; margin-top: 16px; padding: 13px 14px; color: var(--pay-success); background: color-mix(in srgb, var(--pay-success) 9%, var(--pay-surface)); border-radius: 12px; gap: 10px; font-size: 13px; line-height: 1.45; }
.payment-note i { margin-top: 3px; }

.qr-layout { display: grid; grid-template-columns: minmax(240px, .82fr) minmax(320px, 1.18fr); gap: 28px; }
.qr-column { text-align: center; }
.qr-frame { padding: 14px; background: white; border: 1px solid var(--pay-border); border-radius: 18px; box-shadow: 0 10px 30px rgb(6 55 79 / 10%); }
.qr-frame img { display: block; width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; }
.qr-hint { margin: 12px 0 0; color: var(--pay-muted); font-size: 12px; }
.selected-plan { display: flex; margin-bottom: 12px; padding: 12px 16px; background: var(--pay-soft); border-radius: 12px; flex-direction: column; gap: 4px; }
.selected-plan span { color: var(--pay-muted); font-size: 12px; }
.selected-plan strong { color: var(--pay-deep); font-size: 16px; }
.transfer-details { margin: 0; }
.transfer-details > div { display: grid; padding: 10px 0; border-bottom: 1px solid var(--pay-border); grid-template-columns: 150px minmax(0, 1fr); gap: 12px; align-items: center;}
.transfer-details dt { color: var(--pay-muted); font-size: 13px; font-weight: 500; }
.transfer-details dd { display: flex; min-width: 0; margin: 0; align-items: center; justify-content: space-between; gap: 8px; font-size: 13px; font-weight: 600; overflow-wrap: anywhere; }
.copy-button { display: inline-flex; min-height: 22px; padding: 6px 9px; color: var(--pay-primary); background: transparent; border: 0; border-radius: 8px; align-items: center; gap: 6px; cursor: pointer; font-size: 12px; font-weight: 600; }
.copy-button:hover { background: var(--pay-soft); }
.warning-note { display: flex; margin-top: 16px; padding: 13px 14px; color: var(--pay-warning); background: color-mix(in srgb, var(--pay-warning) 9%, var(--pay-surface)); border-radius: 12px; gap: 10px; }
.warning-note p { margin: 0; font-size: 12px; line-height: 1.5; }

.payment-footer { display: flex; min-height: 78px; padding: 15px 24px; border-top: 1px solid var(--pay-border); align-items: center; gap: 12px; }
.secure-caption { margin: 0 auto; color: var(--pay-muted); font-size: 12px; }
.primary-button, .secondary-button { display: inline-flex; min-height: 46px; padding: 0 18px; border-radius: 999px; align-items: center; justify-content: center; gap: 9px; cursor: pointer;}
.primary-button { color: white; background: linear-gradient(135deg, var(--pay-primary-bright), var(--pay-primary)); border: 0; box-shadow: 0 8px 22px color-mix(in srgb, var(--pay-primary) 24%, transparent); }
.primary-button:hover { filter: brightness(.96); }
.secondary-button { color: var(--pay-primary); background: var(--pay-surface); border: 1px solid var(--pay-border); }
.secondary-button:hover { background: var(--pay-soft); }
.primary-button:active, .secondary-button:active { transform: translateY(1px); }
.primary-button:focus-visible, .secondary-button:focus-visible, .icon-button:focus-visible, .copy-button:focus-visible { outline: 3px solid color-mix(in srgb, var(--pay-primary-bright) 30%, transparent); outline-offset: 2px; }

.payment-toast { position: fixed; right: 20px; bottom: 20px; z-index: 1200; max-width: min(360px, calc(100vw - 40px)); padding: 12px 16px; color: white; background: var(--pay-deep); border-radius: 12px; box-shadow: 0 12px 34px var(--pay-shadow); opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity 180ms ease, transform 180ms ease; }
.payment-toast.is-visible { opacity: 1; transform: translateY(0); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }

@keyframes modal-enter { from { opacity: 0; transform: translateY(14px) scale(.985); } }

@media (max-width: 680px) {
  .payment-modal { width: calc(100vw - 16px); max-height: calc(100dvh - 16px); border-radius: 18px; }
  .payment-shell { max-height: calc(100dvh - 16px); }
  .payment-header, .payment-body, .payment-footer { padding-right: 16px; padding-left: 16px; }
  .payment-header { padding-top: 18px; }
  .payment-header h2 { font-size: 19px; }
  .payment-steps { padding: 10px 16px; }
  .payment-step strong { font-size: 12px; }
  .step-line { width: 24px; margin: 0 8px; }
  .plan-content { min-height: 142px; padding: 14px; }
  .plan-period { font-size: 17px; }
  .plan-content strong { font-size: 19px; }
  .discount { position: static; align-self: flex-start; margin-bottom: 8px; }
  .qr-layout { grid-template-columns: 1fr; gap: 22px; }
  .qr-column { width: min(100%, 330px); margin: auto; }
  .payment-footer { flex-wrap: wrap; }
  .secure-caption { width: 100%; order: -1; text-align: center; }
  .payment-footer .primary-button, .payment-footer .secondary-button { flex: 1 1 180px; }
}

@media (max-width: 390px) {
  .plan-grid { grid-template-columns: 1fr; }
  .plan-content { min-height: 128px; }
  .transfer-details > div { grid-template-columns: 1fr; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}