:root { --fg: #1d2330; --muted: #5d6677; --bg: #f5f6f8; --card: #fff; --line: #d6dae1; --accent: #1f5fbf; --ok: #1a7f37; --err: #b42318; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6e8ec; --muted: #9aa3b2; --bg: #14171c; --card: #1d2128; --line: #343a45; --accent: #6ea2ff; --ok: #4ac26b; --err: #ff7b72; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 640px; margin: 32px auto; padding: 24px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
h1 { font-size: 1.5rem; margin: 0 0 4px; }
.en { color: var(--muted); font-size: .9em; }
label .en { margin-left: 6px; }
.small { font-size: .9rem; color: var(--muted); }
label { display: block; font-weight: 600; margin: 16px 0 6px; }
input, textarea, select { width: 100%; padding: 10px; font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; }
textarea { font-family: ui-monospace, Menlo, Consolas, monospace; resize: vertical; }
button { margin-top: 20px; padding: 12px 18px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 6px; cursor: pointer; }
button .en { color: inherit; opacity: .85; }
button:disabled { opacity: .6; cursor: wait; }
#msg.ok { color: var(--ok); font-weight: 600; }
#msg.err { color: var(--err); font-weight: 600; }
a { color: var(--accent); }