:root { --bg: #fff; --fg: #14181d; --muted: #5b6672; --accent: #0b5fff; --err: #b3261e; --line: #d5dbe2; color-scheme: light dark; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #101418; --fg: #eef1f4; --muted: #9aa5b1; --accent: #6ea0ff; --err: #ff8a80; --line: #2b333c; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, sans-serif; }
main { max-width: 32rem; margin: 0 auto; padding: 24px 16px; }
h1 { font-size: 1.4rem; margin: 0 0 12px; }
button { font: inherit; min-height: 48px; padding: 0 20px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; }
form { display: grid; gap: 8px; margin-top: 16px; }
input { font: inherit; min-height: 48px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: transparent; color: inherit; }
.nets { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.net { width: 100%; text-align: left; background: transparent; color: var(--fg); border: 1px solid var(--line); }
.error { color: var(--err); }
.muted { color: var(--muted); }
.busy::before { content: ""; display: inline-block; width: 1em; height: 1em; margin-right: 8px; vertical-align: -2px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .busy::before { animation: none; } }
h2 { font-size: 1.1rem; margin: 12px 0 0; }
select { font: inherit; min-height: 48px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: transparent; color: inherit; }
button[disabled] { opacity: .5; }
button.secondary { background: transparent; color: var(--fg); border: 1px solid var(--line); }
button + button { margin-top: 8px; }
.rules { list-style: none; margin: 0 0 16px; padding: 0; display: grid; gap: 8px; }
.rule { border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.row button, .row button + button { margin-top: 0; padding: 0 14px; }
.action { display: grid; grid-template-columns: 1fr 5rem; gap: 8px; margin-top: 8px; }
.action select, .action button { grid-column: 1 / -1; }