:root {
  --bg: var(--tg-theme-bg-color, #17212b);
  --text: var(--tg-theme-text-color, #f5f5f5);
  --hint: var(--tg-theme-hint-color, #8a9bad);
  --card: var(--tg-theme-secondary-bg-color, #232e3c);
  --accent: var(--tg-theme-button-color, #5288c1);
  --accent-text: var(--tg-theme-button-text-color, #ffffff);
  --border: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 12px;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.tab {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  cursor: pointer;
}

.tab.active {
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.card {
  background: var(--card);
  border-radius: 14px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
  color: var(--hint);
  margin-top: 6px;
}

select,
input {
  padding: 11px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
}

.hint {
  margin: 2px 0 4px;
  font-size: 12.5px;
  color: var(--hint);
  line-height: 1.35;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 8px 0 0;
  padding: 8px 12px 12px;
}

legend {
  padding: 0 6px;
  color: var(--accent);
  font-weight: 600;
}

.primary {
  width: 100%;
  margin-top: 14px;
  padding: 13px;
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

.result {
  margin-top: 14px;
  padding: 14px;
  background: var(--card);
  border-radius: 14px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 14px;
  line-height: 1.5;
}

.error {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #4a1f1f;
  color: #ffd4d4;
  font-size: 14px;
}

.hidden {
  display: none !important;
}