:root {
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #1a1a1f;
  --muted: #6b7280;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eef2ff;
  --warning-bg: #fdecef;
  --warning-text: #b3173a;
  --success: #16a34a;
  --shadow: 0 1px 2px rgba(15, 15, 20, 0.04), 0 8px 24px rgba(15, 15, 20, 0.06);
  --radius: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  width: 100%;
  max-width: 480px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
}

.card__header {
  text-align: center;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.domain {
  margin: 0 0 12px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  word-break: break-all;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.muted {
  color: var(--muted);
  font-weight: 400;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

input::placeholder {
  color: #9ca3af;
}

.amount-wrap {
  position: relative;
}

.amount-prefix {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 16px;
  font-weight: 500;
  pointer-events: none;
}

.amount-wrap input {
  padding-left: 28px;
  font-size: 16px;
  font-weight: 500;
}

input[type="number"] {
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.warning {
  margin: 4px 0 0;
  padding: 10px 12px;
  background: var(--warning-bg);
  color: var(--warning-text);
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: center;
}

.hp-field {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.submit {
  position: relative;
  margin-top: 4px;
  padding: 14px 20px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.15s, opacity 0.15s, transform 0.05s;
}

.submit:hover:not(:disabled) {
  background: var(--primary-hover);
}

.submit:active:not(:disabled) {
  transform: scale(0.99);
}

.submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.submit.is-loading .submit__label {
  visibility: hidden;
}

.submit__spinner {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.submit.is-loading .submit__spinner {
  display: block;
}

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

.form-error {
  margin: 0;
  padding: 10px 12px;
  background: var(--warning-bg);
  color: var(--warning-text);
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: center;
}

.success {
  text-align: center;
  padding: 16px 0;
}

.success__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 50%;
  font-size: 28px;
  font-weight: 700;
}

.success h2 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
}

.success p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

@media (max-width: 480px) {
  .card {
    padding: 24px 20px;
  }
  .domain {
    font-size: 22px;
  }
  .row {
    grid-template-columns: 1fr;
  }
}