:root {
  --bg: var(--tg-theme-bg-color, #0e1621);
  --text: var(--tg-theme-text-color, #f5f7fa);
  --hint: var(--tg-theme-hint-color, #8b9bb4);
  --button: var(--tg-theme-button-color, #3390ec);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --card: var(--tg-theme-secondary-bg-color, #17212b);
  --danger: #e85d4c;
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  padding:
    calc(20px + var(--tg-content-safe-area-inset-top, 0px))
    16px
    calc(24px + var(--tg-content-safe-area-inset-bottom, 16px));
}

.app {
  max-width: 480px;
  margin: 0 auto;
}

.screen[hidden],
.overlay[hidden],
.notice[hidden],
.field[hidden] {
  display: none !important;
}

.title {
  margin: 8px 0 20px;
  font-size: 26px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
}

.field + .field {
  margin-top: 14px;
}

.field__label {
  display: block;
  margin-bottom: 8px;
  color: var(--hint);
  font-size: 13px;
  font-weight: 600;
}

.toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 4px;
  border-radius: 12px;
  background: var(--bg);
}

.toggle__btn {
  min-height: 40px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--hint);
  font-size: 15px;
  font-weight: 650;
  cursor: pointer;
  touch-action: manipulation;
}

.toggle__btn.is-active {
  background: var(--button);
  color: var(--button-text);
}

input {
  width: 100%;
  height: 48px;
  border: 0;
  border-radius: 12px;
  padding: 0 14px;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  outline: none;
}

input::placeholder {
  color: var(--hint);
  opacity: 0.8;
}

input:disabled {
  opacity: 0.6;
}

.notice {
  margin: 14px 0 0;
  color: var(--danger);
  font-size: 14px;
  line-height: 1.4;
}

.actions {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.btn {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 650;
  cursor: pointer;
  touch-action: manipulation;
}

.btn:disabled {
  opacity: 0.55;
  cursor: default;
}

.btn--primary {
  margin-top: 16px;
  background: var(--button);
  color: var(--button-text);
}

.actions .btn--primary {
  margin-top: 0;
}

.btn--ghost {
  background: transparent;
  color: var(--button);
  box-shadow: inset 0 0 0 1.5px var(--button);
}

.receipt__text {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 15px;
  line-height: 1.5;
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  text-align: center;
  color: var(--hint);
  font-size: 15px;
}

.spinner {
  width: 36px;
  height: 36px;
  margin: 0 auto;
  border: 3px solid color-mix(in srgb, var(--button) 25%, transparent);
  border-top-color: var(--button);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}