:root {
  --navy-950: #03102e;
  --navy-900: #04143a;
  --navy-800: #062a85;
  --navy-600: #0b40ac;
  --blue-100: #eaf2fb;
  --blue-50: #f5f8fc;
  --lime: #afd13e;
  --lime-dark: #577409;
  --amber-50: #fff8e7;
  --amber-200: #f4d58a;
  --amber-800: #704900;
  --green-50: #f1f9e8;
  --green-700: #356313;
  --red-50: #fff2f0;
  --red-700: #a1281d;
  --text: #354765;
  --muted: #667791;
  --border: #c8d8eb;
  --surface: #ffffff;
  --focus: #0b40ac;
  --shadow: 0 1.5rem 4rem rgb(4 20 58 / 12%);
  --radius-lg: 1rem;
  --radius-md: .65rem;
  --font: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: linear-gradient(145deg, #f9fbfe 0%, #eef4fb 48%, #f8faed 100%);
  font-family: var(--font);
  line-height: 1.55;
}
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .68; }
a { color: var(--navy-600); }
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: .75rem;
  left: .75rem;
  padding: .75rem 1rem;
  color: #fff;
  background: var(--navy-900);
  border-radius: .4rem;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
  padding: .75rem clamp(1rem, 4vw, 4rem);
  color: #fff;
  background: var(--navy-900);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  color: var(--navy-900);
  background: var(--lime);
  border-radius: 50%;
  font-weight: 900;
}
.test-banner {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0;
  padding: .45rem .75rem;
  color: #fff3c7;
  background: rgb(255 193 7 / 12%);
  border: 1px solid rgb(244 213 138 / 48%);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 800;
}
.test-dot { width: .55rem; height: .55rem; background: #ffc94d; border-radius: 50%; }

.page-shell { width: min(72rem, calc(100% - 2rem)); margin: 0 auto; padding: clamp(2rem, 5vw, 4.5rem) 0; }
.intro { max-width: 48rem; margin-bottom: 2rem; }
.eyebrow { margin: 0 0 .45rem; color: var(--navy-600); font-size: .76rem; font-weight: 900; letter-spacing: .12em; }
h1, h2 { margin-top: 0; color: var(--navy-800); line-height: 1.18; }
h1 { margin-bottom: .75rem; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -.035em; }
h2 { margin-bottom: .65rem; font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
.intro p:last-child, .panel-copy { margin: 0; color: var(--muted); }

.checkout-grid { display: grid; grid-template-columns: minmax(15rem, .72fr) minmax(0, 1.28fr); gap: clamp(1rem, 3vw, 2rem); align-items: start; }
.product-card, .flow-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.product-card { position: sticky; top: 1rem; overflow: hidden; }
.product-card > div:not(.product-visual), .price-summary { margin-right: 1.35rem; margin-left: 1.35rem; }
.product-visual {
  display: grid;
  min-height: 12rem;
  margin-bottom: 1.35rem;
  place-items: center;
  color: #fff;
  background: radial-gradient(circle at 30% 20%, #2c66d0 0%, var(--navy-800) 48%, var(--navy-950) 100%);
}
.product-visual span { padding: .55rem 1rem; border: 2px solid var(--lime); border-radius: 999px; font-size: 1.45rem; font-weight: 900; letter-spacing: .18em; }
.product-code { margin: 0 0 .4rem; color: var(--navy-600); font-size: .78rem; font-weight: 900; letter-spacing: .08em; }
.product-description { margin: 0; color: var(--muted); font-size: .92rem; }
.price-summary { margin-top: 1.35rem; margin-bottom: 1.35rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.price-summary div { display: flex; justify-content: space-between; gap: 1rem; }
.price-summary dt { color: var(--muted); }
.price-summary dd { margin: 0; color: var(--navy-800); font-weight: 800; }
.price-summary .price-total { margin-top: .65rem; font-size: 1.08rem; }
.price-total dd { color: var(--green-700); font-size: 1.35rem; }

.flow-card { min-height: 34rem; padding: clamp(1.15rem, 3vw, 2.25rem); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: .45rem; margin: 0 0 2rem; padding: 0; list-style: none; }
.steps li { display: flex; align-items: center; gap: .45rem; min-width: 0; color: var(--muted); font-size: .78rem; font-weight: 800; }
.steps li::after { height: 2px; flex: 1; margin-left: .1rem; background: var(--border); content: ""; }
.steps li:last-child::after { display: none; }
.steps span { display: grid; width: 1.75rem; height: 1.75rem; flex: 0 0 auto; place-items: center; background: var(--blue-100); border-radius: 50%; }
.steps li.is-active, .steps li.is-complete { color: var(--navy-800); }
.steps li.is-active span { color: #fff; background: var(--navy-600); }
.steps li.is-complete span { color: var(--navy-950); background: var(--lime); }
.steps li.is-complete::after { background: var(--lime); }
.panel { animation: panel-enter 260ms ease-out; }
@keyframes panel-enter { from { opacity: 0; transform: translateY(.4rem); } to { opacity: 1; transform: translateY(0); } }

form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.form-field--full { grid-column: 1 / -1; }
label { display: block; margin-bottom: .4rem; color: var(--navy-800); font-size: .86rem; font-weight: 800; }
input:not([type="checkbox"]) {
  width: 100%;
  min-height: 3rem;
  padding: .8rem .9rem;
  color: var(--navy-900);
  background: var(--blue-50);
  border: 1px solid #7188a8;
  border-radius: var(--radius-md);
}
input:not([type="checkbox"]):hover { border-color: var(--navy-600); }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
input:not([type="checkbox"]):user-invalid { border-color: var(--red-700); }
.form-hint { margin: .4rem 0 0; color: var(--muted); font-size: .82rem; }
.form-hint strong { color: var(--navy-800); }
.checkbox-field { padding: .85rem 1rem; background: var(--blue-50); border: 1px solid var(--border); border-radius: var(--radius-md); }
.checkbox-label { display: flex; align-items: center; gap: .7rem; margin: 0; cursor: pointer; }
.checkbox-label input { width: 1.15rem; height: 1.15rem; flex: 0 0 auto; margin: 0; accent-color: var(--navy-600); }
.checkbox-field .form-hint { margin-left: 1.85rem; }
.invoice-fields { min-width: 0; margin: 0; padding: 1rem; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); }
.invoice-fields legend { padding: 0 .35rem; color: var(--navy-800); font-size: .9rem; font-weight: 900; }
.invoice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }

.button {
  min-height: 3rem;
  padding: .7rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 900;
  transition: transform 150ms ease, background-color 150ms ease;
}
.button:not(:disabled):hover { transform: translateY(-1px); }
.button--primary { color: #fff; background: var(--navy-600); }
.button--primary:not(:disabled):hover { background: var(--navy-800); }
.button--secondary { color: var(--navy-800); background: var(--blue-100); border-color: var(--border); }
.button--text { color: var(--navy-600); background: transparent; }

.message { margin: 1rem 0 0; padding: .75rem .9rem; color: var(--navy-800); background: var(--blue-50); border-left: .25rem solid var(--navy-600); }
.message--error { color: var(--red-700); background: var(--red-50); border-left-color: var(--red-700); }
.message--success { color: var(--green-700); background: var(--green-50); border-left-color: var(--lime-dark); }
.status-badge { display: inline-flex; align-items: center; gap: .5rem; margin-bottom: 1rem; padding: .4rem .7rem; border-radius: 999px; font-size: .82rem; font-weight: 900; }
.status-badge--pending { color: var(--amber-800); background: var(--amber-50); border: 1px solid var(--amber-200); }
.spinner { width: .85rem; height: .85rem; border: 2px solid var(--amber-200); border-top-color: var(--amber-800); border-radius: 50%; animation: spin .85s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.payment-layout { display: grid; grid-template-columns: minmax(11rem, .82fr) minmax(0, 1.18fr); gap: 1rem; margin-top: 1.5rem; align-items: start; }
.qr-frame { display: grid; min-height: 14rem; padding: .75rem; place-items: center; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md); }
.qr-frame img { width: min(100%, 17.5rem); height: auto; aspect-ratio: 1; object-fit: contain; }
.payment-details, .success-summary { margin: 0; }
.payment-details { display: grid; gap: .55rem; }
.payment-details div, .success-summary div { min-width: 0; padding: .65rem .75rem; background: var(--blue-50); border-radius: .4rem; }
.payment-details dt, .success-summary dt { color: var(--muted); font-size: .72rem; font-weight: 900; text-transform: uppercase; }
.payment-details dd, .success-summary dd { margin: .15rem 0 0; color: var(--navy-800); font-weight: 900; overflow-wrap: anywhere; }
.payment-details .discount-row { background: var(--green-50); }
.payment-details .discount-row dd { color: var(--green-700); }
.payment-details .payment-total { border: 1px solid var(--lime); }
.payment-details .payment-total dd { color: var(--green-700); font-size: 1.15rem; }
.payment-details dd.copy-value { display: flex; align-items: center; justify-content: space-between; gap: .65rem; }
.copy-value span { min-width: 0; overflow-wrap: anywhere; }
.copy-button {
  min-height: 2.25rem;
  flex: 0 0 auto;
  padding: .35rem .6rem;
  color: var(--navy-600);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: .5rem;
  font-size: .76rem;
  font-weight: 900;
  white-space: nowrap;
}
.copy-button:hover { color: #fff; background: var(--navy-600); }
.copy-button[data-copy-state="success"] { color: var(--green-700); background: var(--green-50); border-color: var(--lime); }
.required-note { color: var(--red-700); font-size: .7rem; text-transform: none; }
.copy-message { min-height: 1.5rem; margin: .65rem 0 0; color: var(--green-700); font-size: .82rem; text-align: center; }
.copy-message.message--error { padding: .5rem .7rem; text-align: left; }
.countdown-line { margin: 1.25rem 0 0; color: var(--muted); text-align: center; }
.countdown-line strong { color: var(--amber-800); font-variant-numeric: tabular-nums; }
.action-row { display: flex; justify-content: center; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }

.success-panel { max-width: 34rem; margin: 1rem auto 0; text-align: center; }
.success-mark { display: grid; width: 4.5rem; height: 4.5rem; margin: 0 auto 1.25rem; place-items: center; color: #fff; background: var(--green-700); border: .45rem solid #def0ca; border-radius: 50%; font-size: 2.1rem; font-weight: 900; }
.success-summary { display: grid; grid-template-columns: repeat(2, 1fr); gap: .55rem; margin-top: 1.5rem; text-align: left; }
.success-panel > .button { width: 100%; margin-top: 1rem; }

.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding: 1.5rem clamp(1rem, 4vw, 4rem); color: #b8c8e5; background: var(--navy-950); font-size: .85rem; }
.site-footer p { margin: 0; }
.site-footer a { color: #fff; }

@media (max-width: 48rem) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .checkout-grid { grid-template-columns: 1fr; }
  .product-card { position: static; }
  .product-visual { min-height: 8rem; }
  .payment-layout { grid-template-columns: 1fr; }
  .qr-frame { min-height: 12rem; }
  .copy-button { min-height: 2.75rem; }
}

@media (max-width: 34rem) {
  .page-shell { width: min(100% - 1rem, 72rem); padding-top: 1.5rem; }
  .flow-card { padding: 1rem; }
  .steps li { display: grid; justify-items: center; text-align: center; }
  .steps li::after { display: none; }
  form, .invoice-grid, .success-summary { grid-template-columns: 1fr; }
  .form-field--full { grid-column: auto; }
  .site-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}