:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1b2230;
  --muted: #5d6676;
  --border: #dfe3e9;
  --primary: #254c84;
  --primary-text: #ffffff;
  --primary-soft: #e6edf7;
  --success: #1f7a4d;
  --success-soft: #e5f4ec;
  --warning: #8a5a00;
  --warning-soft: #fff4dc;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 1px 3px rgb(16 24 40 / 8%);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #10141b;
    --surface: #181e27;
    --surface-2: #202834;
    --text: #e8ecf2;
    --muted: #9aa4b4;
    --border: #2c3542;
    --primary: #7fa7e0;
    --primary-text: #0d1726;
    --primary-soft: #1c2b42;
    --success: #5cc993;
    --success-soft: #15291f;
    --warning: #f0b955;
    --warning-soft: #2e2412;
    --danger: #f2877d;
    --danger-soft: #331a18;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #10141b; --surface: #181e27; --surface-2: #202834; --text: #e8ecf2; --muted: #9aa4b4;
  --border: #2c3542; --primary: #7fa7e0; --primary-text: #0d1726; --primary-soft: #1c2b42;
  --success: #5cc993; --success-soft: #15291f; --warning: #f0b955; --warning-soft: #2e2412;
  --danger: #f2877d; --danger-soft: #331a18; --shadow: none;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
[hidden] { display: none !important; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.1rem; }
p { margin: 0 0 .75rem; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 16px; padding-top: max(.6rem, env(safe-area-inset-top));
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; font-size: 1.05rem; }
.brand img { border-radius: 7px; }
.topbar-actions { display: flex; align-items: center; gap: .5rem; }
.user-box { display: flex; align-items: center; gap: .4rem; }
.user-box img { border-radius: 50%; background: var(--surface-2); }

main { flex: 1; width: 100%; max-width: 720px; margin: 0 auto; padding: 16px; }
.view.center { display: grid; place-items: center; min-height: 50vh; }
.hero { padding: 1rem 0 .5rem; }
.lead { font-size: 1.05rem; color: var(--muted); }
.hello { color: var(--muted); margin: .25rem 0 1rem; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1rem 1.1rem; margin-bottom: 1rem;
}
.card-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.card-success { border-color: var(--success); background: var(--success-soft); }
details.card > summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; }
details.card > summary::-webkit-details-marker { display: none; }
details.card > summary::after { content: "▾"; color: var(--muted); transition: transform .2s; }
details.card[open] > summary::after { transform: rotate(180deg); }
details.card > summary h2 { margin: 0; }
details.card[open] > summary { margin-bottom: .75rem; }

.badge {
  font-size: .75rem; font-weight: 600; padding: .15rem .55rem; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary); white-space: nowrap;
}
.badge.ok { background: var(--success-soft); color: var(--success); }
.badge.warn { background: var(--warning-soft); color: var(--warning); }
.badge.danger { background: var(--danger-soft); color: var(--danger); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  min-height: 42px; padding: .5rem 1rem; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn-primary:hover { background: var(--primary); filter: brightness(1.08); }
.btn-ghost { background: transparent; border-color: transparent; min-height: 36px; padding: .35rem .7rem; }
.btn-danger-ghost { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn.small { min-height: 34px; padding: .3rem .7rem; font-size: .875rem; }
.actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1rem; }
.actions.end { justify-content: flex-end; }

input[type="email"], input[type="text"] {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: .55rem .75rem; min-height: 42px; width: 100%; min-width: 0;
}
input:focus-visible, .btn:focus-visible, summary:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.row { display: flex; gap: .5rem; align-items: center; }
.row.wrap { flex-wrap: wrap; }
.row.wrap input { flex: 1 1 200px; }

.alert { padding: .7rem .9rem; border-radius: 10px; margin: .75rem 0; font-size: .95rem; }
.alert-error { background: var(--danger-soft); color: var(--danger); }
.alert-warn { background: var(--warning-soft); color: var(--warning); }
.alert-info { background: var(--primary-soft); color: var(--primary); }

.google-button { min-height: 44px; margin: 1rem 0; }
.dev-login { border-top: 1px dashed var(--border); padding-top: .75rem; margin-top: 1rem; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: .5rem; }
.stat { background: var(--surface-2); border-radius: 10px; padding: .55rem .7rem; }
.stat b { display: block; font-size: 1.2rem; font-variant-numeric: tabular-nums; }
.stat span { font-size: .8rem; color: var(--muted); }

.dropzone {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: .25rem;
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 1.4rem 1rem; cursor: pointer;
  background: var(--surface-2); margin-top: .5rem;
}
.dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }
.dropzone input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }

.backup-list { display: grid; gap: .6rem; margin-top: .9rem; }
.backup {
  border: 1px solid var(--border); border-radius: 12px; padding: .75rem .85rem; background: var(--surface);
}
.backup-head { display: flex; justify-content: space-between; gap: .5rem; align-items: flex-start; }
.backup-name { font-weight: 700; word-break: break-word; }
.backup-meta { font-size: .85rem; color: var(--muted); }
.backup .remove { border: 0; background: transparent; color: var(--muted); font-size: 1.3rem; line-height: 1; cursor: pointer; padding: .1rem .3rem; }
.backup-report { margin-top: .5rem; font-size: .9rem; }
.chips { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .35rem; }
.chip { font-size: .8rem; padding: .1rem .5rem; border-radius: 999px; background: var(--surface-2); }
.chip.add { background: var(--success-soft); color: var(--success); }
.chip.del { background: var(--danger-soft); color: var(--danger); }
.chip.upd { background: var(--primary-soft); color: var(--primary); }
.toggle { display: flex; gap: .5rem; align-items: flex-start; margin-top: .5rem; font-size: .9rem; }
.toggle input { margin-top: .25rem; width: 18px; height: 18px; flex: none; }
.detail-list { margin: .4rem 0 0; padding-left: 1.1rem; font-size: .85rem; max-height: 220px; overflow: auto; }

.progress { display: flex; align-items: center; gap: .6rem; margin-top: 1rem; color: var(--muted); }
.spinner {
  width: 34px; height: 34px; border-radius: 50%; border: 3px solid var(--border); border-top-color: var(--primary);
  animation: spin .8s linear infinite;
}
.spinner.small { width: 18px; height: 18px; border-width: 2px; }
@keyframes spin { to { transform: rotate(360deg); } }

.device-list, .history-list, .admin-list { display: grid; gap: .5rem; }
.item-row {
  display: flex; justify-content: space-between; align-items: center; gap: .6rem;
  padding: .6rem .1rem; border-bottom: 1px solid var(--border);
}
.item-row:last-child { border-bottom: 0; }
.item-row .grow { flex: 1; min-width: 0; }
.item-row .title { font-weight: 600; word-break: break-word; }

.steps { padding-left: 1.2rem; margin: .5rem 0; }
.steps li { margin-bottom: .4rem; }
.danger-zone { border-top: 1px solid var(--border); margin-top: 1rem; padding-top: 1rem; }

.footer { text-align: center; padding: 1rem 16px 2rem; padding-bottom: max(2rem, env(safe-area-inset-bottom)); }

dialog {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text);
  max-width: min(440px, calc(100vw - 32px)); padding: 1.1rem;
}
dialog::backdrop { background: rgb(0 0 0 / 45%); }