:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --fg: #1a1f24;
  --muted: #5b6671;
  --border: #dce1e6;
  --accent: #2d8cf0;
  --accent-fg: #ffffff;
  --danger: #e04848;
  --ok: #2a9d58;
  --shadow: 0 2px 10px rgba(0,0,0,.06);
}
:root[data-theme="dark"] {
  --bg: #0f1419;
  --card: #181f27;
  --fg: #e7edf3;
  --muted: #9aa7b3;
  --border: #2a333d;
  --accent: #4ba3ff;
  --accent-fg: #06121f;
  --danger: #ff6b6b;
  --ok: #4cc47e;
  --shadow: 0 2px 12px rgba(0,0,0,.4);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1419; --card: #181f27; --fg: #e7edf3; --muted: #9aa7b3;
    --border: #2a333d; --accent: #4ba3ff; --accent-fg: #06121f;
    --danger: #ff6b6b; --ok: #4cc47e; --shadow: 0 2px 12px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 24px 0 8px; }
p { margin: 8px 0; }
.muted { color: var(--muted); font-size: .92rem; }
a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 16px 0;
}
.card h2:first-child { margin-top: 0; }

label { display: block; font-size: .88rem; color: var(--muted); margin: 12px 0 4px; }
input, select, button {
  font: inherit;
  width: 100%;
  padding: 11px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
}
input:focus, select:focus { outline: 2px solid var(--accent); border-color: transparent; }
button {
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
  font-weight: 600;
  cursor: pointer;
  margin-top: 14px;
  min-height: 44px;
}
button:hover { filter: brightness(1.05); }
button.secondary { background: transparent; color: var(--fg); border: 1px solid var(--border); }
button.danger { background: var(--danger); color: #fff; }
button:disabled { opacity: .5; cursor: not-allowed; }

.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 140px; }

.tabs { display: flex; gap: 8px; margin: 8px 0 0; }
.tabs button { width: auto; flex: 1; margin-top: 0; }
.tabs button.secondary { font-weight: 500; }

.note {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 9px; padding: 12px; font-size: .9rem; margin: 12px 0;
}
.msg { margin-top: 10px; font-size: .9rem; min-height: 1.2em; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }

.topbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.topbar h1 { flex: 0 1 auto; }
.topbar-actions { display: flex; gap: 8px; flex: 0 0 auto; }
.topbar-actions .theme-toggle { width: auto; white-space: nowrap; }
.theme-toggle {
  width: auto; min-width: 44px; padding: 8px 12px; margin: 0;
  background: var(--card); color: var(--fg); border: 1px solid var(--border);
}

.oplist { list-style: none; padding: 0; margin: 8px 0 0; }
.oplist li { border: 1px solid var(--border); border-radius: 9px; padding: 12px; margin-bottom: 8px; }
.oplist .share { font-family: monospace; font-size: .85rem; word-break: break-all; }
.badge { font-size: .75rem; padding: 2px 8px; border-radius: 20px; background: var(--border); color: var(--fg); }
.badge.on { background: var(--ok); color: #fff; }
.hidden { display: none !important; }