:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #eef2f8;
  --text: #0f172a;
  --muted: #5b6474;
  --border: #dde3ec;
  --brand: #1f4fd8;
  --brand-ink: #ffffff;
  --brand-soft: #e6edfd;
  --danger: #c62828;
  --danger-soft: #fdecec;
  --ok: #157f3b;
  --navy: #0b1730;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 16px rgba(15, 23, 42, .05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0f1c;
    --surface: #111827;
    --surface-2: #1a2334;
    --text: #e8edf6;
    --muted: #97a1b3;
    --border: #263044;
    --brand: #5b8cff;
    --brand-soft: #18264a;
    --danger: #ff6b6b;
    --danger-soft: #3a1a1d;
    --ok: #4ade80;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
[hidden] { display: none !important; }

/* Layout */
.wrap { max-width: 720px; margin: 0 auto; padding-inline: 16px; }
.wrap-narrow { max-width: 420px; margin: 0 auto; padding-inline: 16px; }
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 12px; }
.topbar .row { min-width: 0; }
.topbar .wrap-wide { height: 64px; }
.nav-link { color: var(--text); font-weight: 600; padding: 8px 10px; }
@media (max-width: 360px) {
  .nav-link { padding-inline: 6px; }
  .topbar .brand { font-size: 0; gap: 0; } /* logo only, so Guides + Get started fit at 320px */
}
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { width: 26px; height: 26px; }
main { padding: 24px 0 48px; }
.stack > * + * { margin-top: 16px; }
.row { display: flex; align-items: center; gap: 12px; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.grow { flex: 1; min-width: 0; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }

/* Surfaces */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px;
}
.list { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.list-item {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px;
  border-top: 1px solid var(--border); color: var(--text); width: 100%;
  background: none; border-left: 0; border-right: 0; border-bottom: 0; font: inherit; text-align: left;
}
.list-item:first-child { border-top: 0; }
a.list-item:hover, button.list-item:hover { background: var(--surface-2); text-decoration: none; cursor: pointer; }
.empty { padding: 32px 16px; text-align: center; color: var(--muted); }

/* Controls */
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
input, select {
  width: 100%; font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 11px 12px; min-height: 44px;
}
input:focus, select:focus, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--brand); outline-offset: 1px;
}
.field + .field { margin-top: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; min-height: 44px; padding: 10px 16px;
  border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:disabled { opacity: .6; cursor: default; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { background: var(--brand); filter: brightness(1.08); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--danger-soft); }
.btn-block { width: 100%; }
.btn-sm { min-height: 34px; padding: 6px 10px; font-size: .875rem; }
.btn-icon { min-height: 40px; min-width: 40px; padding: 8px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); overflow-x: auto; }
.tab {
  padding: 10px 14px; font-weight: 600; color: var(--muted); border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab:hover { text-decoration: none; color: var(--text); }
.tab.active { color: var(--brand); border-color: var(--brand); }
.seg { display: flex; background: var(--surface-2); border-radius: 8px; padding: 3px; }
.seg button {
  flex: 1; font: inherit; font-weight: 600; border: 0; background: none; color: var(--muted);
  padding: 8px; border-radius: 6px; cursor: pointer; min-height: 38px;
}
.seg button.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
details summary { cursor: pointer; color: var(--muted); font-weight: 600; font-size: .9rem; }

/* Badges / alerts */
.badge {
  display: inline-block; font-size: .75rem; font-weight: 600; padding: 2px 8px;
  border-radius: 999px; background: var(--surface-2); color: var(--muted);
}
.badge-owner { background: var(--brand-soft); color: var(--brand); }
.alert { padding: 12px 14px; border-radius: 8px; background: var(--danger-soft); color: var(--danger); font-size: .9rem; }
.alert-ok { background: var(--brand-soft); color: var(--brand); }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 50;
  background: var(--navy); color: #fff; padding: 10px 16px; border-radius: 8px; font-size: .9rem; box-shadow: var(--shadow);
}

/* Codes */
.avatar {
  flex: none; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); font-weight: 700;
}
.code {
  font: 600 1.6rem/1 var(--mono); letter-spacing: .12em; color: var(--text);
}
.code-hidden { color: var(--muted); letter-spacing: .2em; }
.ring { flex: none; width: 28px; height: 28px; }
.ring circle { fill: none; stroke-width: 3; }
.ring .track { stroke: var(--border); }
.ring .bar { stroke: var(--brand); stroke-linecap: round; transform: rotate(-90deg); transform-origin: 50% 50%; }
.ring.low .bar { stroke: var(--danger); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Scanner */
.scanner { position: relative; border-radius: var(--radius); overflow: hidden; background: #000; aspect-ratio: 1; }
.scanner video { width: 100%; height: 100%; object-fit: cover; display: block; }
.scanner .frame {
  position: absolute; inset: 18%; border: 3px solid rgba(255, 255, 255, .85); border-radius: 14px;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, .35);
}

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(8, 12, 24, .55); z-index: 40;
  display: flex; align-items: flex-end; justify-content: center; padding: 16px;
}
.modal { width: 100%; max-width: 440px; }
@media (min-width: 640px) { .modal-backdrop { align-items: center; } }
.auth-page { padding-top: 12vh; }
.mt-lg { margin-top: 20px; }

/* Mobile refinements */
.btn { white-space: nowrap; }
.title { overflow-wrap: anywhere; margin: 0; }
.tab { padding: 10px 12px; }
.member { flex-wrap: wrap; }
.member .actions { display: flex; flex-wrap: wrap; gap: 8px; width: 100%; padding-left: 52px; }
.member .actions:empty { display: none; }
@media (max-width: 480px) {
  #me-email { max-width: 34vw; }
}
@media (min-width: 640px) {
  .member { flex-wrap: nowrap; }
  .member .actions { width: auto; padding-left: 0; }
}

/* Shared site footer — same markup on every page (test/site-chrome.test.js). */
.wrap-wide { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.footer { padding: 32px 0 40px; border-top: 1px solid var(--border); }
.footer .row-between { flex-wrap: wrap; row-gap: 12px; }
.footer-links { gap: 12px 24px; flex-wrap: wrap; }
.footer-links a { color: var(--text); font-weight: 500; white-space: nowrap; }
.footer-legal { margin-top: 16px; }
.page { min-height: 100vh; display: flex; flex-direction: column; }
.page > main { flex: 1 0 auto; width: 100%; }
.page > .footer { margin-top: 48px; }