:root {
  color-scheme: dark;
  --bg: #07110f;
  --panel: #0c1b17;
  --panel-2: #11231e;
  --line: rgba(217, 255, 241, 0.11);
  --text: #f2f7f4;
  --muted: #8da49b;
  --green: #7df0ae;
  --green-strong: #21cf78;
  --amber: #ffc66c;
  --red: #ff8d83;
  --radius: 24px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 72% -5%, rgba(56, 218, 137, 0.18), transparent 32rem),
    radial-gradient(circle at -15% 24%, rgba(31, 126, 101, 0.11), transparent 28rem),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}

button, select { font: inherit; }
button { color: inherit; }
.app-shell { width: min(100%, 760px); margin: 0 auto; padding: env(safe-area-inset-top) 18px env(safe-area-inset-bottom); }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: 20px 2px 12px; }
.brand { color: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 11px; }
.brand > span:last-child { display: grid; line-height: 1; }
.brand strong { font-size: 13px; letter-spacing: .2em; }
.brand small { color: var(--muted); font-size: 11px; margin-top: 5px; }
.brand-mark { width: 35px; height: 35px; border: 1px solid rgba(125, 240, 174, .35); border-radius: 11px; display: flex; align-items: end; justify-content: center; gap: 3px; padding: 8px; transform: skew(-6deg); background: linear-gradient(145deg, rgba(125,240,174,.12), transparent); }
.brand-mark i { width: 4px; border-radius: 3px; background: var(--green); box-shadow: 0 0 12px rgba(125,240,174,.4); }
.brand-mark i:nth-child(1) { height: 7px; opacity: .55; }
.brand-mark i:nth-child(2) { height: 12px; opacity: .75; }
.brand-mark i:nth-child(3) { height: 18px; }

.server-state { display: flex; align-items: center; gap: 7px; padding: 8px 11px; border: 1px solid var(--line); background: rgba(13, 28, 23, .7); border-radius: 999px; color: var(--muted); font-size: 11px; white-space: nowrap; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 4px rgba(255,198,108,.09); }
.server-state[data-state="online"] { color: #c6f7d9; }
.server-state[data-state="online"] .status-dot { background: var(--green-strong); box-shadow: 0 0 0 4px rgba(33,207,120,.1), 0 0 12px rgba(33,207,120,.6); }
.server-state[data-state="offline"] .status-dot { background: var(--red); box-shadow: 0 0 0 4px rgba(255,141,131,.1); }

.hero { padding: 42px 4px 28px; }
.eyebrow, .label { margin: 0 0 10px; color: var(--green); text-transform: uppercase; letter-spacing: .16em; font-size: 11px; font-weight: 750; }
.hero h1 { margin: 0; font-size: clamp(41px, 11vw, 70px); line-height: .96; letter-spacing: -.06em; font-weight: 720; }
.hero h1 em { color: var(--green); font-style: normal; font-weight: inherit; text-shadow: 0 0 35px rgba(80, 237, 150, .18); }
.hero-copy { margin: 22px 0 0; max-width: 580px; color: var(--muted); font-size: 15px; line-height: 1.58; }

.mode-switch { position: sticky; top: calc(env(safe-area-inset-top) + 8px); z-index: 5; display: grid; grid-template-columns: 1fr 1fr; gap: 5px; margin-bottom: 16px; padding: 5px; border: 1px solid var(--line); border-radius: 17px; background: rgba(8, 22, 18, .88); backdrop-filter: blur(18px); box-shadow: 0 12px 30px rgba(0,0,0,.2); }
.mode-button { border: 0; border-radius: 12px; background: transparent; color: var(--muted); padding: 12px 14px; display: flex; align-items: center; justify-content: center; gap: 9px; font-size: 14px; font-weight: 700; cursor: pointer; }
.mode-button svg, .source-icon svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.mode-button.is-active { background: linear-gradient(135deg, rgba(125,240,174,.18), rgba(125,240,174,.07)); color: #dcffea; box-shadow: inset 0 0 0 1px rgba(125,240,174,.18); }

.mode-panel { display: grid; gap: 14px; }
.notice-card, .truth-card { display: flex; gap: 13px; align-items: flex-start; padding: 16px; border: 1px solid rgba(255, 198, 108, .18); border-radius: 18px; background: rgba(255, 198, 108, .06); }
.notice-icon { flex: 0 0 auto; width: 25px; height: 25px; border-radius: 50%; display: grid; place-items: center; background: rgba(255, 198, 108, .14); color: var(--amber); font-weight: 800; font-size: 12px; }
.notice-card strong, .truth-card strong { display: block; font-size: 13px; }
.notice-card p, .truth-card p { margin: 5px 0 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
.zigbee-notice { border-color: rgba(125,240,174,.17); background: rgba(125,240,174,.05); }
.zigbee-notice .notice-icon { color: var(--green); background: rgba(125,240,174,.11); }

.step-row { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 8px; padding: 8px 2px; }
.step { display: flex; align-items: center; gap: 10px; min-width: 0; }
.step > span { width: 29px; height: 29px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--green); font-size: 11px; font-weight: 800; }
.step p { margin: 0; display: grid; gap: 3px; min-width: 0; }
.step strong { font-size: 12px; white-space: nowrap; }
.step small { color: var(--muted); font-size: 10px; white-space: nowrap; }
.step-arrow { color: #486159; }

.measure-card, .source-card, .how-card { border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(150deg, rgba(18, 39, 32, .92), rgba(9, 22, 18, .96)); box-shadow: var(--shadow); }
.measure-card { padding: 21px; overflow: hidden; position: relative; }
.measure-card::after { content: ""; position: absolute; width: 180px; height: 180px; border-radius: 50%; background: rgba(63, 220, 135, .07); filter: blur(30px); top: -100px; right: -80px; pointer-events: none; }
.card-heading { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; position: relative; z-index: 1; }
.card-heading .label { margin-bottom: 5px; font-size: 9px; }
.card-heading h2 { margin: 0; font-size: 19px; letter-spacing: -.02em; }
.quality-badge, .source-pill { border-radius: 999px; padding: 7px 10px; color: var(--muted); background: rgba(255,255,255,.045); border: 1px solid var(--line); font-size: 10px; white-space: nowrap; }
.quality-badge[data-quality="good"], .source-pill[data-state="live"] { color: var(--green); border-color: rgba(125,240,174,.22); background: rgba(125,240,174,.07); }
.quality-badge[data-quality="okay"] { color: var(--amber); border-color: rgba(255,198,108,.22); background: rgba(255,198,108,.07); }
.quality-badge[data-quality="poor"], .source-pill[data-state="stale"] { color: var(--red); border-color: rgba(255,141,131,.2); background: rgba(255,141,131,.06); }

.primary-reading, .zigbee-reading { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: center; margin: 22px 0; }
.score-ring, .signal-orbit { --score: 0; width: 106px; height: 106px; border-radius: 50%; display: grid; place-items: center; position: relative; background: conic-gradient(var(--green-strong) calc(var(--score) * 1%), rgba(255,255,255,.065) 0); box-shadow: 0 0 28px rgba(40, 212, 120, .08); }
.score-ring::before, .signal-orbit::before { content: ""; position: absolute; inset: 7px; border-radius: 50%; background: #0d1e19; border: 1px solid rgba(255,255,255,.04); }
.score-ring > div, .signal-orbit > div { position: relative; display: grid; text-align: center; }
.score-ring strong, .signal-orbit strong { font-size: 28px; line-height: 1; letter-spacing: -.04em; }
.score-ring small, .signal-orbit small { margin-top: 4px; color: var(--muted); font-size: 9px; text-transform: uppercase; letter-spacing: .1em; }
.reading-summary strong { display: block; font-size: 15px; line-height: 1.25; }
.reading-summary p { margin: 7px 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }

.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.metric { padding: 12px 10px; min-width: 0; border: 1px solid rgba(255,255,255,.065); border-radius: 14px; background: rgba(2, 12, 9, .28); }
.metric span { display: block; color: var(--muted); font-size: 9px; margin-bottom: 7px; white-space: nowrap; }
.metric strong { font-size: 10px; font-weight: 600; white-space: nowrap; }
.metric b { font-size: 17px; letter-spacing: -.03em; }
.metric .compact { display: block; overflow: hidden; text-overflow: ellipsis; font-size: 11px; }
.two-columns { grid-template-columns: 1fr 1fr; }

.chart-wrap { margin-top: 18px; }
.chart-label { display: flex; justify-content: space-between; color: var(--muted); font-size: 9px; }
.line-chart { width: 100%; height: 82px; overflow: visible; margin-top: 8px; }
.chart-grid { fill: none; stroke: rgba(255,255,255,.055); stroke-width: 1; vector-effect: non-scaling-stroke; }
.line-chart polyline { fill: none; stroke: var(--green); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; filter: drop-shadow(0 0 5px rgba(125,240,174,.25)); }
.chart-area { fill: url(#none); stroke: none; opacity: .13; }

.primary-button { width: 100%; margin-top: 16px; padding: 14px 16px; display: flex; align-items: center; justify-content: center; gap: 12px; border: 1px solid rgba(125,240,174,.25); border-radius: 16px; color: #062014; background: linear-gradient(135deg, #8af6b6, #45db8a); cursor: pointer; box-shadow: 0 12px 25px rgba(33,207,120,.14); }
.primary-button:active { transform: translateY(1px); }
.primary-button[aria-pressed="true"] { background: rgba(255,141,131,.12); border-color: rgba(255,141,131,.25); color: #ffd8d4; box-shadow: none; }
.button-icon { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; background: rgba(0,0,0,.1); font-size: 10px; }
.primary-button > span:last-child { display: grid; text-align: left; }
.primary-button strong { font-size: 13px; }
.primary-button small { font-size: 9px; margin-top: 3px; opacity: .65; }
.data-note { margin: 10px 0 0; color: #647a72; text-align: center; font-size: 9px; }

.source-card { display: flex; align-items: flex-start; gap: 14px; padding: 17px; box-shadow: 0 15px 45px rgba(0,0,0,.18); }
.source-icon { flex: 0 0 auto; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; color: var(--green); background: rgba(125,240,174,.08); border: 1px solid rgba(125,240,174,.12); }
.source-copy { min-width: 0; flex: 1; }
.source-title { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.source-title strong { font-size: 13px; }
.source-copy > p { color: var(--muted); margin: 7px 0 0; font-size: 11px; line-height: 1.5; }
.source-pill { padding: 5px 8px; font-size: 9px; }
.device-select { width: 100%; margin-top: 12px; min-height: 43px; padding: 0 38px 0 12px; border: 1px solid var(--line); border-radius: 12px; color: var(--text); background: #0b1814; }
.device-select:disabled { color: var(--muted); opacity: 1; }
.radio-readings { margin-top: 12px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.radio-readings div { padding: 10px; border-radius: 11px; background: rgba(255,255,255,.035); color: var(--muted); font-size: 9px; }
.radio-readings strong { display: block; color: var(--text); font-size: 13px; margin-top: 4px; }

.select-label { display: block; color: var(--muted); font-size: 10px; margin: 22px 0 -5px; }
.zigbee-reading { margin-top: 22px; }
.signal-orbit { --signal: 0; --score: var(--signal); background: conic-gradient(from 210deg, var(--green-strong) calc(var(--signal) * 1%), rgba(255,255,255,.06) 0); }
.orbit-dot { position: absolute; z-index: 2; width: 9px; height: 9px; background: var(--green); border-radius: 50%; top: 7px; left: calc(50% - 4px); box-shadow: 0 0 15px var(--green); transform-origin: 4px 46px; transform: rotate(calc(var(--signal) * 3.6deg)); }
.truth-card { margin-top: 1px; border-color: rgba(125,240,174,.15); background: rgba(125,240,174,.045); }
.truth-card svg { flex: 0 0 auto; width: 26px; height: 26px; padding: 5px; border-radius: 50%; color: var(--green); background: rgba(125,240,174,.1); fill: none; stroke: currentColor; stroke-width: 2; }

.how-card { margin-top: 14px; box-shadow: none; overflow: hidden; }
.how-card > button { width: 100%; border: 0; background: transparent; display: flex; justify-content: space-between; align-items: center; padding: 17px; text-align: left; cursor: pointer; }
.how-card button span:first-child { display: grid; gap: 4px; }
.how-card button small { color: var(--green); text-transform: uppercase; letter-spacing: .12em; font-size: 8px; }
.how-card button strong { font-size: 13px; }
.chevron { color: var(--muted); font-size: 18px; transition: transform .2s ease; }
.how-card button[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.how-content { border-top: 1px solid var(--line); padding: 5px 17px 17px; }
.how-content ol { list-style: none; padding: 0; margin: 0; }
.how-content li { display: grid; grid-template-columns: 78px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,.05); }
.how-content li:last-child { border: 0; }
.how-content span { color: var(--green); font-size: 11px; font-weight: 700; }
.how-content p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.45; }

footer { display: flex; justify-content: space-between; gap: 12px; padding: 28px 4px 35px; color: #52675f; font-size: 9px; }
[hidden] { display: none !important; }

@media (min-width: 620px) {
  .app-shell { padding-left: 28px; padding-right: 28px; }
  .hero { padding-top: 62px; }
  .measure-card { padding: 27px; }
  .score-ring, .signal-orbit { width: 122px; height: 122px; }
  .score-ring::before, .signal-orbit::before { inset: 8px; }
  .score-ring strong, .signal-orbit strong { font-size: 34px; }
  .metric { padding: 15px; }
  .metric b { font-size: 21px; }
}

@media (max-width: 370px) {
  .hero h1 { font-size: 38px; }
  .primary-reading, .zigbee-reading { gap: 13px; }
  .score-ring, .signal-orbit { width: 92px; height: 92px; }
  .score-ring strong, .signal-orbit strong { font-size: 24px; }
  .metric { padding: 10px 7px; }
  .metric b { font-size: 15px; }
  .step small { display: none; }
}

@media (max-width: 520px) {
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}