:root {
  --bg: #f5f6f8; --panel: #ffffff; --text: #15171c; --muted: #5d6573; --line: #e2e5ea;
  --accent: #2463eb; --accent-soft: #e8efff; --accent-text: #ffffff; --danger: #c62828; --ok: #1b7f3b; --warn: #a15c00;
  --radius: 12px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1115; --panel: #181b21; --text: #e8eaee; --muted: #9aa2b1; --line: #2a2e36;
    --accent: #5b8cff; --accent-soft: #1d2740; --danger: #ff6b6b; --ok: #4cc27a; --warn: #f0a640; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.5; }
a { color: var(--accent); }

/* Header and navigation */
header { display: flex; align-items: center; gap: 20px; padding: 12px 20px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line); background: var(--panel); position: sticky; top: 0; z-index: 5; }
header a.brand { font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: -.01em; }
nav { display: flex; align-items: center; gap: 4px; flex: 1; flex-wrap: wrap; }
nav a.tab { padding: 6px 12px; border-radius: 8px; color: var(--muted); text-decoration: none; font-size: .95rem; }
nav a.tab:hover { color: var(--text); background: var(--bg); }
nav a.tab.active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
nav .spacer { flex: 1; }
nav .who { color: var(--muted); font-size: .9rem; }

main { max-width: 960px; margin: 0 auto; padding: 28px 16px 72px; }
main.narrow { max-width: 440px; }
main.wide { max-width: 1040px; }
h1 { font-size: 1.6rem; margin: 0 0 18px; letter-spacing: -.01em; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 6px 0; }
.titlebar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.titlebar h1 { margin: 0; }
.center { text-align: center; }

section.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin-bottom: 18px; }
section.card > h2 .count { color: var(--muted); font-weight: 400; }

/* Landing */
.hero { text-align: center; padding: 40px 0 28px; }
.hero h1 { font-size: 2.3rem; margin-bottom: 12px; }
.hero .lead { font-size: 1.1rem; color: var(--muted); max-width: 640px; margin: 0 auto; }
.hero .row { justify-content: center; margin-top: 24px; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 20px 0 28px; }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.step .num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-weight: 700; }
ol.checklist { padding-left: 20px; margin: 0; }
ol.checklist li { margin: 8px 0; }

/* Forms */
label { display: block; font-size: .9rem; color: var(--muted); margin: 12px 0 4px; }
label.check { display: flex; gap: 8px; align-items: center; color: var(--text); margin: 6px 0; font-size: .95rem; }
fieldset.choices { border: 0; padding: 0; margin: 12px 0; }
.indent { margin-left: 26px; }
input[type=text], input[type=email], input[type=password], input[type=number], select {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--text); font-size: 1rem; }
.row > input, .row > select { width: auto; flex: 1 1 180px; }
td select { width: auto; padding: 4px 8px; font-size: .9rem; }
input.code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 1.6rem; letter-spacing: .15em;
  text-transform: uppercase; text-align: center; }
button, a.button { display: inline-block; padding: 9px 16px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent);
  color: var(--accent-text); font-size: .95rem; cursor: pointer; text-decoration: none; line-height: 1.3; font-family: inherit; }
button.secondary, a.button.secondary { background: transparent; color: var(--accent); }
button.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
button.small { padding: 4px 10px; font-size: .85rem; }
button.wide-button { width: 100%; }
button:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 14px; }
.or { text-align: center; color: var(--muted); font-size: .9rem; margin: 14px 0 0; }
.muted { color: var(--muted); font-size: .9rem; }
.msg { margin-top: 12px; font-size: .95rem; }
.msg:empty { display: none; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--ok); }
.banner { background: color-mix(in srgb, var(--warn) 14%, transparent); border: 1px solid var(--warn);
  color: var(--text); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 18px; }

/* Tables and lists */
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 10px 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
tr:last-child td { border-bottom: 0; }
th { color: var(--muted); font-weight: 500; font-size: .85rem; }
td.actions { text-align: right; white-space: nowrap; }
td .sub { display: block; color: var(--muted); font-size: .85rem; }
.empty { color: var(--muted); padding: 10px 0; }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; background: var(--muted); opacity: .5; }
.dot.on { background: var(--ok); opacity: 1; box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 20%, transparent); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .78rem; background: var(--accent-soft); color: var(--accent); margin-left: 6px; vertical-align: 1px; }
.badge.grey { background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
code.secret { display: block; padding: 12px; border-radius: 8px; background: var(--bg); border: 1px dashed var(--line);
  font-size: .95rem; word-break: break-all; user-select: all; margin-top: 8px; }

/* Dialogs */
dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); color: var(--text);
  padding: 20px 22px; width: min(440px, calc(100vw - 32px)); }
dialog::backdrop { background: rgb(0 0 0 / .35); }
dialog h2 { margin-top: 0; }
dialog .row { justify-content: flex-end; }

@media (max-width: 600px) {
  .hide-narrow { display: none; }
  .hero h1 { font-size: 1.8rem; }
  header { gap: 8px; }
  nav .who { display: none; }
}