* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 14px;
  background: var(--tg-theme-secondary-bg-color, #f4f4f5);
  color: var(--tg-theme-text-color, #111);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

.app {
  max-width: 440px;
  margin: 0 auto;
}

h1 {
  margin: 8px 0 14px;
  font-size: 24px;
  text-align: center;
}

.card {
  background: var(--tg-theme-bg-color, #fff);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06);
}

.field {
  margin-bottom: 14px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--tg-theme-hint-color, #777);
  font-size: 13px;
  font-weight: 600;
}

input {
  width: 100%;
  height: 50px;
  padding: 0 14px;
  border: 1px solid #ddd;
  border-radius: 12px;
  background: var(--tg-theme-bg-color, #fff);
  color: var(--tg-theme-text-color, #111);
  font-size: 17px;
  outline: none;
}

input:focus {
  border-color: var(--tg-theme-button-color, #3390ec);
}

button {
  width: 100%;
  height: 52px;
  margin-top: 6px;
  border: 0;
  border-radius: 14px;
  background: var(--tg-theme-button-color, #3390ec);
  color: var(--tg-theme-button-text-color, #fff);
  font-size: 17px;
  font-weight: 700;
}

button:disabled {
  opacity: 0.6;
}

hr {
  border: 0;
  border-top: 1px solid #eee;
  margin: 16px 0;
}

#message {
  display: none;
  margin-top: 14px;
  padding: 12px;
  border-radius: 12px;
  text-align: center;
  font-weight: 700;
  line-height: 1.35;
}

#message.success {
  display: block;
  background: rgba(46, 204, 113, 0.15);
  color: #27ae60;
}

#message.error {
  display: block;
  background: rgba(231, 76, 60, 0.15);
  color: #c0392b;
}