:root {
  color: #15201b;
  background: #eef2ee;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
}

.brand-header {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding-top: 24px;
}

.brand-icon {
  display: block;
  width: 56px;
  height: 56px;
  object-fit: contain;
}

button,
input {
  font: inherit;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.checkout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1fr);
  gap: 28px;
  align-items: start;
}

.summary {
  padding: 28px 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: #51625b;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 14ch;
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.summary p:not(.eyebrow) {
  max-width: 56ch;
  color: #46544f;
  font-size: 1.08rem;
  line-height: 1.6;
}

.payment-form,
.result-panel {
  border: 1px solid #d2ddd7;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 18px 50px rgb(24 43 34 / 0.08);
}

.payment-form {
  display: grid;
  gap: 14px;
  padding: 24px;
}

label {
  color: #30423a;
  font-size: 0.9rem;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 48px;
  border: 1px solid #c9d5cf;
  border-radius: 6px;
  padding: 0 14px;
  color: #16231d;
  background: #fbfdfb;
}

input:focus {
  border-color: #246b57;
  outline: 3px solid rgb(36 107 87 / 0.15);
}

.payment-options {
  display: grid;
  gap: 10px;
  border: 1px solid #d2ddd7;
  border-radius: 6px;
  margin: 0;
  padding: 14px;
}

.payment-options legend {
  padding: 0 6px;
  color: #30423a;
  font-size: 0.9rem;
  font-weight: 700;
}

.checkbox-option {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #20342b;
  font-size: 0.95rem;
  font-weight: 700;
}

.checkbox-option input {
  width: 18px;
  min-height: 18px;
  accent-color: #1d6f5a;
}

.amount-presets {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.currency-selector {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.preset-button,
.currency-button {
  min-height: 44px;
  border: 1px solid #c9d5cf;
  background: #f7faf8;
  color: #20342b;
  font-weight: 800;
}

.preset-button:hover,
.preset-button.is-selected,
.currency-button:hover,
.currency-button.is-selected {
  border-color: #1d6f5a;
  background: #e4f4ed;
  color: #174f42;
}

.card-frame {
  min-height: 240px;
}

.status {
  min-height: 24px;
  margin: 0;
  color: #51625b;
  font-size: 0.92rem;
}

button {
  min-height: 48px;
  border: 0;
  border-radius: 6px;
  padding: 0 18px;
  color: #ffffff;
  background: #1d6f5a;
  font-weight: 800;
  cursor: pointer;
}

button:disabled {
  background: #9aa9a2;
  cursor: not-allowed;
}

.billing-dialog {
  width: min(520px, calc(100% - 32px));
  border: 1px solid #d2ddd7;
  border-radius: 8px;
  padding: 0;
  color: #15201b;
  background: #ffffff;
  box-shadow: 0 24px 80px rgb(24 43 34 / 0.22);
}

.billing-dialog::backdrop {
  background: rgb(10 20 16 / 0.5);
}

.billing-form {
  display: grid;
  gap: 12px;
  padding: 24px;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 8px;
}

.secondary-button {
  border: 1px solid #c9d5cf;
  color: #20342b;
  background: #f7faf8;
}

.result-panel {
  grid-column: 2;
  padding: 18px;
}

pre {
  min-height: 120px;
  margin: 0;
  overflow: auto;
  border-radius: 6px;
  padding: 14px;
  background: #12231b;
  color: #dcefe6;
  font-size: 0.86rem;
  line-height: 1.5;
}

@media (max-width: 820px) {
  .shell {
    padding: 28px 0;
  }

  .checkout {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 11ch;
  }

  .result-panel {
    grid-column: auto;
  }
}