:root {
  color-scheme: dark;
  --ink: #f3f8f5;
  --muted: #9db0ac;
  --canvas: #061415;
  --surface: #0b2021;
  --surface-raised: #102a2b;
  --line: #244143;
  --accent: #75e1bd;
  --accent-ink: #052018;
  --warm: #f1bb6a;
  --shadow: 0 18px 60px rgb(0 0 0 / 24%);
  --radius: 1.2rem;
  font-family: ui-rounded, "SF Pro Rounded", "Segoe UI", system-ui, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--canvas); }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background: radial-gradient(circle at 84% -10%, rgb(51 136 113 / 17%), transparent 32rem), var(--canvas);
  color: var(--ink);
}
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--warm); outline-offset: 3px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 20; padding: .75rem 1rem; border-radius: .7rem; background: var(--ink); color: var(--canvas); }
.skip-link:focus { top: 1rem; }

.app-header, main, footer { width: min(100% - 2rem, 72rem); margin-inline: auto; }
.app-header { display: flex; align-items: center; justify-content: space-between; padding-block: 1.15rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--accent); text-decoration: none; }
.brand span { display: grid; line-height: 1.02; }
.brand strong { color: var(--ink); font-size: 1.05rem; }
.brand small { margin-top: .2rem; color: var(--muted); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }
.mode-pill { display: inline-flex; align-items: center; gap: .5rem; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .76rem; font-weight: 700; }
.mode-pill > span { width: .5rem; height: .5rem; border-radius: 50%; background: var(--warm); box-shadow: 0 0 0 .25rem rgb(241 187 106 / 12%); }

main { padding-block: 3.5rem 2.5rem; }
.overview { display: grid; gap: 1.5rem; margin-bottom: 3.3rem; }
.eyebrow { margin: 0 0 .45rem; color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 12ch; margin-bottom: .8rem; font-size: clamp(2.25rem, 8vw, 4.7rem); line-height: .96; letter-spacing: -.055em; }
h2 { margin-bottom: 0; font-size: clamp(1.3rem, 3vw, 1.65rem); letter-spacing: -.025em; }
.intro { max-width: 38rem; margin-bottom: 0; color: var(--muted); line-height: 1.55; }
.home-score { align-self: end; display: flex; align-items: center; gap: .7rem; width: fit-content; padding: .8rem 1rem; border: 1px solid rgb(117 225 189 / 20%); border-radius: 1rem; background: rgb(117 225 189 / 8%); }
.home-score svg { padding: .2rem; border-radius: 50%; background: var(--accent); color: var(--accent-ink); stroke: currentColor; stroke-width: 2.5; fill: none; }
.home-score span { display: grid; }
.home-score strong { font-size: .9rem; }
.home-score small { margin-top: .15rem; color: var(--muted); font-size: .72rem; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.text-button { padding: .5rem 0; border: 0; background: none; color: var(--accent); cursor: pointer; font-size: .8rem; font-weight: 800; }
.action-grid, .status-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.action-card { position: relative; min-height: 9.6rem; padding: 1rem; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); cursor: pointer; text-align: left; transition: border-color 160ms ease, background 160ms ease, transform 160ms ease; }
.action-card:hover { border-color: #3a5d5e; transform: translateY(-2px); }
.action-card[aria-pressed="true"] { border-color: rgb(117 225 189 / 42%); background: linear-gradient(145deg, rgb(117 225 189 / 16%), var(--surface-raised)); }
.action-card:disabled { cursor: not-allowed; opacity: .62; }
.action-card:disabled:hover { border-color: var(--line); transform: none; }
.card-icon { display: grid; place-items: center; width: 2.35rem; height: 2.35rem; margin-bottom: 1.4rem; border-radius: .75rem; background: rgb(255 255 255 / 6%); color: var(--muted); }
.action-card[aria-pressed="true"] .card-icon { background: var(--accent); color: var(--accent-ink); }
.card-icon svg, .connection-icon svg { stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; fill: none; }
.action-card strong, .action-card small { display: block; }
.action-card strong { font-size: .95rem; }
.action-card small { margin-top: .25rem; color: var(--muted); font-size: .76rem; }
.demo-tag { position: absolute; right: .75rem; top: .75rem; color: var(--muted); font-size: .62rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }

.status-section { margin-top: 3rem; }
.updated-time { color: var(--muted); font-size: .75rem; }
.status-card { min-height: 8.2rem; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.status-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.status-top strong { font-size: .88rem; }
.status-dot { width: .55rem; height: .55rem; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 .27rem rgb(117 225 189 / 10%); }
.status-value { display: block; margin-top: 1.5rem; font-size: 1.45rem; font-weight: 750; letter-spacing: -.04em; }
.status-meta { display: block; margin-top: .2rem; color: var(--muted); font-size: .75rem; }

.connection-card { display: grid; gap: 1rem; margin-top: 3rem; padding: 1.2rem; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(135deg, var(--surface-raised), var(--surface)); box-shadow: var(--shadow); }
.connection-icon { display: grid; place-items: center; width: 2.8rem; height: 2.8rem; border-radius: .85rem; background: rgb(241 187 106 / 12%); color: var(--warm); }
.connection-copy p:last-child { margin: .55rem 0 0; color: var(--muted); font-size: .86rem; line-height: 1.5; }
.secondary-button, .primary-button { min-height: 2.75rem; padding: .7rem 1rem; border-radius: .8rem; cursor: pointer; font-weight: 800; }
.secondary-button { border: 1px solid var(--line); background: rgb(255 255 255 / 4%); color: var(--ink); }
.primary-button { width: 100%; border: 0; background: var(--accent); color: var(--accent-ink); }

footer { display: flex; justify-content: space-between; padding-block: 1.2rem 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .72rem; }
.toast { position: fixed; left: 50%; bottom: 1.3rem; z-index: 10; max-width: calc(100% - 2rem); padding: .7rem 1rem; border: 1px solid var(--line); border-radius: 999px; background: var(--ink); color: var(--canvas); box-shadow: var(--shadow); font-size: .8rem; font-weight: 750; opacity: 0; pointer-events: none; transform: translate(-50%, 1rem); transition: opacity 160ms ease, transform 160ms ease; }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }

dialog { width: min(calc(100% - 2rem), 31rem); padding: 1.25rem; border: 1px solid var(--line); border-radius: 1.3rem; background: var(--surface-raised); color: var(--ink); box-shadow: var(--shadow); }
dialog::backdrop { background: rgb(0 8 9 / 76%); backdrop-filter: blur(3px); }
.dialog-heading { display: flex; align-items: start; justify-content: space-between; gap: 1rem; }
.icon-button { width: 2.5rem; height: 2.5rem; border: 1px solid var(--line); border-radius: 50%; background: transparent; color: var(--ink); cursor: pointer; font-size: 1.5rem; line-height: 1; }
.checklist { display: grid; gap: 1rem; margin: 1.5rem 0; padding: 0; list-style: none; }
.checklist li { display: grid; grid-template-columns: 2rem 1fr; gap: .8rem; align-items: start; }
.checklist li > span { display: grid; place-items: center; width: 2rem; height: 2rem; border: 1px solid rgb(117 225 189 / 30%); border-radius: 50%; color: var(--accent); font-size: .75rem; font-weight: 850; }
.checklist strong { font-size: .9rem; }
.checklist p { margin: .25rem 0 0; color: var(--muted); font-size: .8rem; line-height: 1.45; }

@media (min-width: 44rem) {
  .app-header, main, footer { width: min(100% - 4rem, 72rem); }
  main { padding-top: 5rem; }
  .overview { grid-template-columns: 1fr auto; align-items: end; }
  .action-grid, .status-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .connection-card { grid-template-columns: auto 1fr auto; align-items: center; padding: 1.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}