:root {
  --tg-bg: #ffffff;
  --tg-text: #000000;
  --tg-hint: #707579;
  --tg-link: #40a7e3;
  --tg-button: #40a7e3;
  --tg-button-text: #ffffff;
  --tg-secondary-bg: #f1f1f1;
  --tg-section-bg: #ffffff;
  --tg-separator: #e4e4e4;
  --tg-destructive: #e53935;
  --tg-success: #2eab5b;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--tg-bg);
  color: var(--tg-text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.shell {
  max-width: 460px;
  margin: 0 auto;
  padding: 24px 18px calc(28px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100vh;
}

/* ---------- brand ---------- */
.brand {
  text-align: center;
}

.brand__mark {
  font-size: 34px;
  line-height: 1;
}

.brand__title {
  margin: 6px 0 2px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.brand__subtitle {
  margin: 0;
  color: var(--tg-hint);
  font-size: 14px;
}

/* ---------- card ---------- */
.card {
  background: var(--tg-section-bg);
  border: 1px solid var(--tg-separator);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card--center {
  align-items: center;
  text-align: center;
}

.card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 650;
}

.card__hint {
  margin: -8px 0 0;
  color: var(--tg-hint);
  font-size: 14px;
}

.done__icon {
  font-size: 44px;
  line-height: 1;
}

/* ---------- fields ---------- */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--tg-hint);
}

.field__hint {
  margin: 0;
  font-size: 12.5px;
  color: var(--tg-hint);
  min-height: 1em;
}

.field__hint--ok {
  color: var(--tg-success);
}

.field__hint--bad {
  color: var(--tg-destructive);
}

.input,
.select-wrap select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  font-size: 16px;
  font-family: inherit;
  color: var(--tg-text);
  background: var(--tg-secondary-bg);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  appearance: none;
}

.input::placeholder {
  color: var(--tg-hint);
}

.input:focus,
.select-wrap select:focus {
  border-color: var(--tg-button);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--tg-button) 22%, transparent);
}

.input--code {
  text-align: center;
  font-size: 24px;
  letter-spacing: 10px;
  font-weight: 600;
  text-indent: 10px;
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--tg-hint);
  border-bottom: 2px solid var(--tg-hint);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.select-wrap select {
  padding-right: 40px;
  cursor: pointer;
}

/* ---------- buttons ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 12px 18px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.06s ease;
}

.btn:active {
  transform: scale(0.99);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--tg-button);
  color: var(--tg-button-text);
}

.btn--ghost {
  background: transparent;
  color: var(--tg-link);
  min-height: 42px;
  font-weight: 500;
  font-size: 15px;
}

.row {
  display: flex;
  gap: 8px;
  justify-content: space-between;
}

.row .btn {
  flex: 1;
}

.spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn.is-loading .spinner {
  display: inline-block;
}

.btn.is-loading .btn__label {
  opacity: 0.75;
}

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

/* ---------- alert ---------- */
.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: color-mix(in srgb, var(--tg-destructive) 12%, transparent);
  color: var(--tg-destructive);
  border: 1px solid color-mix(in srgb, var(--tg-destructive) 30%, transparent);
}

.alert--ok {
  background: color-mix(in srgb, var(--tg-success) 12%, transparent);
  color: var(--tg-success);
  border-color: color-mix(in srgb, var(--tg-success) 30%, transparent);
}

/* ---------- footer ---------- */
.foot {
  margin-top: auto;
  text-align: center;
  color: var(--tg-hint);
  font-size: 12.5px;
}

[hidden] {
  display: none !important;
}