:root {
  --success: #15803d;
  --error: #b91c1c;
  --mono: "Cascadia Code", "Fira Code", Consolas, monospace;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab {
  font: inherit;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  cursor: pointer;
  color: var(--muted);
}

.tab.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.tab-panel.hidden {
  display: none;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 640px) {
  .grid,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

input[type="text"],
textarea {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.55rem 0.65rem;
}

#enc-decimal {
  font-family: var(--mono);
  font-size: 0.82rem;
  resize: vertical;
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-all;
}

input:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.key-info {
  margin-top: 1rem;
  padding: 0.65rem 0.75rem;
  background: var(--surface-2);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text);
  word-break: break-all;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 0.5rem;
}

button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 6px;
}

button:hover:not(:disabled) {
  background: var(--border);
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

button.secondary {
  border-color: var(--accent);
  color: var(--accent);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.file-btn {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.file-btn input {
  display: none;
}

.file-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.file-meta {
  font-size: 0.88rem;
  color: var(--text);
}

.file-label .file-meta {
  color: var(--muted);
}

.preview-label {
  margin-top: 1.25rem;
}

.status {
  min-height: 1.25rem;
  font-size: 0.85rem;
  margin: 0.25rem 0 0;
}

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

.status.err {
  color: var(--error);
}