:root {
  --tg-bg: #0e0e10;
  --tg-text: #ffffff;
  --tg-hint: #9a9a9d;
  --tg-link: #6ab7ff;
  --tg-button: #3b81f6;
  --tg-button-text: #ffffff;
  --tg-secondary-bg: #1c1c1e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--tg-bg);
  color: var(--tg-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 16px;
}

.card {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

h1 {
  font-size: 22px;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--tg-hint);
  margin-top: 0;
  margin-bottom: 28px;
}

.primary-btn {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  background: var(--tg-button);
  color: var(--tg-button-text);
  cursor: pointer;
}

.primary-btn:disabled {
  opacity: 0.6;
}

.secondary-btn {
  padding: 10px 16px;
  font-size: 14px;
  border: none;
  border-radius: 10px;
  background: var(--tg-secondary-bg);
  color: var(--tg-text);
  cursor: pointer;
  white-space: nowrap;
}

.result {
  margin-top: 24px;
}

.result.hidden,
.error.hidden {
  display: none;
}

#qr-image {
  width: 220px;
  height: 220px;
  border-radius: 12px;
  background: #fff;
  padding: 8px;
}

.link-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

#sub-link {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--tg-secondary-bg);
  background: var(--tg-secondary-bg);
  color: var(--tg-text);
  font-size: 13px;
}

.hint {
  color: var(--tg-hint);
  font-size: 13px;
  margin-top: 16px;
}

.error {
  color: #ff6b6b;
  margin-top: 16px;
}