:root {
  --bg: #f5f6fc;
  --surface: #ffffff;
  --text: #14172b;
  --muted: #5d6280;
  --line: #dde0f0;
  --accent: #5b50d6;
  --ring-gradient: linear-gradient(150deg, #2b6fb0 0%, #5b50d6 55%, #9a4fb8 100%);
  --accent-text: #ffffff;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1122;
    --surface: #181b30;
    --text: #eef0fb;
    --muted: #9aa0c2;
    --line: #2b2f4d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom);
}
#app { max-width: 520px; margin: 0 auto; padding: 24px 0 40px; }
.top h1 { font-size: 1.5rem; margin: 0 0 4px; letter-spacing: -0.01em; }
.muted { color: var(--muted); margin: 0; font-size: 0.9rem; }
[hidden] { display: none !important; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.groups { display: grid; gap: 12px; margin-top: 16px; }
.group h2 { margin: 0 0 2px; font-size: 1.25rem; }
.group .status { margin-bottom: 14px; }
.group.joined { border-color: var(--accent); }
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

label { display: block; font-weight: 600; margin-bottom: 8px; }
input {
  width: 100%;
  font: inherit;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  margin-bottom: 12px;
}
button {
  font: inherit;
  font-weight: 600;
  min-height: 48px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
button.primary, button.alert { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
button:disabled { opacity: 0.55; cursor: not-allowed; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.setup { margin-top: 16px; display: grid; gap: 12px; }
.setup p { margin: 0; }
#hint { margin-top: 16px; min-height: 1.4em; }
.downloads { margin-top: 12px; }
.downloads h2 { margin: 0 0 2px; font-size: 1.1rem; }
.downloads .muted { margin-bottom: 14px; }
.downloads .download-help { margin: 12px 0 0; font-size: 0.8rem; }
a.button {
  display: grid;
  place-items: center;
  min-height: 48px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}
a.button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.push-status { margin: 16px 0 0; font-size: 0.9rem; color: var(--muted); }
.push-status.ok { color: var(--accent); font-weight: 600; }
.push-status.warn { color: var(--text); border-left: 3px solid var(--accent); padding-left: 10px; }

.ring {
  position: fixed;
  inset: 0;
  background: var(--ring-gradient);
  color: var(--accent-text);
  display: grid;
  place-items: center;
  padding: 24px;
  z-index: 10;
  animation: pulse 0.8s ease-in-out infinite alternate;
}
.ring-box { text-align: center; display: grid; gap: 16px; width: 100%; max-width: 420px; }
.ring-group { margin: 0; font-size: 1rem; letter-spacing: 0.2em; text-transform: uppercase; opacity: 0.85; }
.ring h2 { margin: 0; font-size: 2rem; line-height: 1.2; }
.ring button { min-height: 64px; font-size: 1.15rem; }
.ring .dismiss { background: #fff; color: #14172b; border-color: #fff; }
@keyframes pulse { from { filter: brightness(1); } to { filter: brightness(0.82); } }
@media (prefers-reduced-motion: reduce) { .ring { animation: none; } }