:root {
  --bg: #0D1117; --panel: #161B22; --panel2: #1F2630; --line: #30363D;
  --fg: #E6EDF3; --muted: #9BA7B4; --green: #2ECC71; --green-ink: #06210F;
  --amber: #F2B134; --amber-ink: #2A1C00; --grey: #6E7681; --red: #FF6B6B;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
body { padding: env(safe-area-inset-top) 0 calc(72px + env(safe-area-inset-bottom)); min-height: 100vh; }
button, input, select { font: inherit; color: inherit; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px;
  border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg); z-index: 2; }
.brand { font-weight: 700; letter-spacing: .08em; display: flex; align-items: center; gap: 8px; }
.mark { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 7px;
  background: var(--green); color: var(--green-ink); font-weight: 800; letter-spacing: 0; }
.top-right { display: flex; gap: 14px; align-items: center; }
main { padding: 16px; max-width: 640px; margin: 0 auto; }
h1 { font-size: 1.35rem; margin: 4px 0 12px; text-wrap: balance; }
h2 { font-size: 1.1rem; margin: 22px 0 10px; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.center { text-align: center; }
.small { font-size: .9rem; }
.banner { border-radius: 12px; padding: 14px 16px; margin: 0 0 16px; font-weight: 600; }
.banner .sub { font-weight: 400; margin-top: 4px; }
.banner.ok { background: #12301F; border: 1px solid #1F6B3E; }
.banner.ok .dot { background: var(--green); }
.banner.problem { background: #33270A; border: 1px solid #7A5A12; }
.banner.problem .dot { background: var(--amber); }
.banner.unknown { background: #22272E; border: 1px solid var(--line); }
.banner.unknown .dot { background: var(--grey); }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 8px; vertical-align: 1px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin: 0 0 14px; }
.card h3 { margin: 0 0 4px; font-size: 1.15rem; }
.state { margin: 0 0 12px; }
.state strong { font-size: 1.05rem; }
.btns { display: grid; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); gap: 10px; }
.btn { min-height: 56px; border-radius: 12px; border: 1px solid var(--line); background: var(--panel2);
  font-weight: 700; font-size: 1.05rem; padding: 10px 12px; cursor: pointer; }
.btn:active { transform: scale(.98); }
.btn.on { background: var(--green); color: var(--green-ink); border-color: var(--green); }
.btn.off { background: #2B3138; }
.btn.off.now { border: 2px solid var(--fg); }
.btn.primary { background: var(--green); color: var(--green-ink); border-color: var(--green); width: 100%; }
.btn.danger { color: var(--red); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.pending { margin-top: 10px; font-weight: 600; }
.pending.good { color: var(--green); }
.pending.bad { color: var(--amber); }
.link-btn { background: none; border: 0; color: var(--green); text-decoration: underline; padding: 6px 0; cursor: pointer; }
.pin-dots { display: flex; justify-content: center; gap: 14px; margin: 18px 0; }
.pin-dots span { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--muted); }
.pin-dots span.f { background: var(--fg); border-color: var(--fg); }
.pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 320px; margin: 0 auto; }
.pad button { min-height: 58px; border-radius: 50%; aspect-ratio: 1; border: 1px solid var(--line);
  background: var(--panel); font-size: 1.6rem; font-weight: 600; max-width: 84px; justify-self: center; width: 100%; cursor: pointer; }
.pad button.txt { font-size: 1rem; border: 0; background: none; color: var(--muted); }
.msg { min-height: 1.5em; text-align: center; margin: 10px 0; }
.msg.err { color: var(--amber); }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
input, select { width: 100%; min-height: 50px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); padding: 10px 12px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.seg button.sel { background: var(--green); color: var(--green-ink); border-color: var(--green); }
.sess { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 0;
  border-top: 1px solid var(--line); }
.sess:first-of-type { border-top: 0; }
.sess .what { min-width: 0; }
.phone { font-size: 1.3rem; font-weight: 700; user-select: all; -webkit-user-select: all; }
.tabs { position: fixed; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: repeat(3, 1fr);
  background: var(--panel); border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom); }
.tab { min-height: 60px; background: none; border: 0; color: var(--muted); font-weight: 600; cursor: pointer; }
.tab.sel { color: var(--green); }
.hint { background: var(--panel2); border: 1px dashed var(--line); border-radius: 12px; padding: 12px; margin: 14px 0; }

/* iPhone home-screen setup (0100) */
.steps { padding-left: 1.3em; line-height: 1.5; }
.steps li { margin: 0 0 10px; }
.code { font-size: 1.6em; letter-spacing: 0.08em; white-space: nowrap; }