:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5d6470;
  --border: #d9dde3;
  --accent: #2f5bea;
  --accent-text: #ffffff;
  --error: #c0362c;
  --radius: 10px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1a1d23;
    --text: #e8eaee;
    --muted: #9aa1ad;
    --border: #2e333c;
    --accent: #6b8cff;
    --accent-text: #0d1020;
    --error: #ff7b70;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

header { margin-bottom: 28px; }

.brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.tagline { margin: 4px 0 0; color: var(--muted); }

section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

h2 { margin: 0 0 8px; font-size: 1.2rem; }

label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.95rem; }

textarea, input, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  resize: vertical;
}

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

.row { display: flex; gap: 16px; margin-top: 16px; }
.row .field { flex: 1; min-width: 0; }
#reveal-pass-field { margin: 16px 0 4px; }

button, .button {
  display: inline-block;
  margin-top: 20px;
  padding: 11px 18px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

button:disabled { opacity: 0.6; cursor: progress; }

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

.copy-row { display: flex; gap: 8px; margin: 16px 0 8px; }
.copy-row input { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.85rem; }
.copy-row button { margin-top: 0; flex-shrink: 0; }

.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.actions .button, .actions button { margin-top: 16px; }

.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--error); margin: 12px 0 0; }
code { font-size: 0.9em; }

@media (max-width: 520px) {
  main { padding-top: 28px; }
  section { padding: 18px; }
  .row { flex-direction: column; gap: 12px; }
}