:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a66ff;
  --accent-hover: #0850c9;
  --border: #d8d8de;
  --error: #d92d20;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --card-bg: #222226;
    --text: #f2f2f3;
    --muted: #9a9aa2;
    --border: #38383e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 16px;
}

.view { width: 100%; display: flex; justify-content: center; }
.view[hidden] { display: none; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 100%;
  max-width: 420px;
}

.card.wide { max-width: 720px; }

h1 { margin: 0 0 4px; font-size: 1.4rem; }
h2 { margin: 0; font-size: 1.05rem; }

.subtitle, .hint { color: var(--muted); font-size: 0.9rem; margin: 0 0 16px; }

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

form { display: flex; flex-direction: column; gap: 12px; }

input[type="password"], input[type="file"], select {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.95rem;
}

.field-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 2px;
}

button {
  cursor: pointer;
  border-radius: 8px;
  border: none;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 500;
}

.primary-btn, button[type="submit"] {
  background: var(--accent);
  color: white;
  margin-top: 8px;
}
.primary-btn:hover, button[type="submit"]:hover { background: var(--accent-hover); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.link-btn {
  background: transparent;
  color: var(--accent);
  padding: 4px 8px;
}

.error { color: var(--error); font-size: 0.9rem; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; border-bottom: 1px solid var(--border); }
.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 4px;
  color: var(--muted);
}
.tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }

.tab-panel { display: flex; flex-direction: column; gap: 10px; margin-bottom: 8px; }
.tab-panel[hidden] { display: none; }

.status {
  margin: 16px 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.result-panel { margin-top: 16px; }

#result-text {
  width: 100%;
  min-height: 260px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
}

.privacy-note {
  margin-top: 24px;
  font-size: 0.78rem;
  color: var(--muted);
}