:root {
  --primary: #38bdf8;
  --primary-dark: #0284c7;
  --bg: #0a0f1e;
  --bg-soft: #0f1626;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #e7ecf5;
  --text-muted: #93a1b8;
  --heading: #fff;
  --live: #86efac;
  --live-border: rgba(134, 239, 172, 0.3);
  --divider: rgba(255, 255, 255, 0.15);
  --warn: #fbbf24;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(60rem 40rem at 15% -10%, rgba(56, 189, 248, 0.16), transparent 60%),
    radial-gradient(50rem 30rem at 110% 10%, rgba(56, 189, 248, 0.10), transparent 55%),
    var(--bg);
  min-height: 100vh;
}

.wrap {
  max-width: 60rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

.wrap.narrow {
  max-width: 40rem;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand img {
  width: 28px;
  height: 28px;
}

.nav a.gh {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  border: 1px solid var(--card-border);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  transition: all 0.15s ease;
}

.nav a.gh:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--primary);
}

/* Badges */
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.badge {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
}

.badge.live {
  color: var(--live);
  border-color: var(--live-border);
  background: rgba(34, 197, 94, 0.08);
}

.badge.live::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  margin-right: 0.4rem;
  box-shadow: 0 0 6px #4ade80;
}

/* Header */
.hero {
  text-align: center;
  padding: 1.5rem 0 2.5rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.6rem;
  background: linear-gradient(135deg, var(--heading), var(--primary) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 34rem;
  margin: 0 auto;
  line-height: 1.6;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 2rem;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.card + .card {
  margin-top: 1.25rem;
}

.card h2, .card h3 {
  color: var(--heading);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p, .card li {
  color: var(--text-muted);
  line-height: 1.65;
}

.card a {
  color: var(--primary);
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}

@media (max-width: 720px) {
  .grid3 {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2rem;
  }
}

.tile {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 1.9rem;
  text-align: center;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.tile:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 12px 30px -12px rgba(56, 189, 248, 0.35);
}

.tile h3 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
}

.tile p {
  font-size: 0.9rem;
  min-height: 3.4rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 0.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  transition: filter 0.15s ease, transform 0.15s ease;
  box-shadow: 0 8px 20px -8px rgba(56, 189, 248, 0.55);
}

.btn:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

/* Spec grid */
.specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.spec {
  background: rgba(56, 189, 248, 0.07);
  border: 1px solid rgba(56, 189, 248, 0.15);
  padding: 0.9rem 1rem;
  border-radius: 0.7rem;
}

.spec .label {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.spec .value {
  font-weight: 600;
  margin-top: 0.15rem;
  color: var(--heading);
}

.note {
  border-left: 3px solid var(--primary);
  background: rgba(56, 189, 248, 0.08);
  padding: 0.9rem 1.1rem;
  border-radius: 0 0.6rem 0.6rem 0;
  margin-top: 1.25rem;
}

.note strong {
  color: var(--heading);
}

.tag {
  display: inline-block;
  background: linear-gradient(135deg, #4ade80, #22c55e);
  color: #052e16;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 0.4rem;
  vertical-align: middle;
  margin-left: 0.5rem;
}

/* Install button */
esp-web-install-button button {
  font-size: 1.05rem;
  padding: 0.9rem 2.2rem;
  border-radius: 0.7rem;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  font-weight: 600;
  font-family: inherit;
  box-shadow: 0 10px 25px -10px rgba(56, 189, 248, 0.6);
  transition: filter 0.15s ease, transform 0.15s ease;
}

esp-web-install-button button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

footer {
  text-align: center;
  padding: 3rem 0 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

footer a:hover {
  color: var(--primary);
}

.divider {
  color: var(--divider);
}

.section-card {
  margin-top: 2.5rem;
}

.section-gap {
  margin-top: 2rem;
}

.card.center {
  text-align: center;
}

.unsupported-note {
  display: block;
  margin-top: 1.5rem;
}

ol, ul {
  padding-left: 1.2rem;
}

/* Light mode support */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f7fb;
    --card: rgba(255, 255, 255, 0.7);
    --card-border: rgba(15, 23, 42, 0.08);
    --text: #0f172a;
    --text-muted: #52607a;
    --heading: #0f172a;
    --live: #15803d;
    --live-border: rgba(21, 128, 61, 0.3);
    --divider: rgba(15, 23, 42, 0.2);
  }

  .hero h1 {
    background: linear-gradient(135deg, var(--heading), var(--primary-dark) 120%);
    -webkit-background-clip: text;
    background-clip: text;
  }

  .nav a.gh:hover {
    border-color: rgba(15, 23, 42, 0.25);
  }

  .card, .tile {
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .badge {
    background: rgba(15, 23, 42, 0.03);
  }
}

/* Auto-fitting tile grid, used where a fourth variant makes a fixed
   three-column layout wrap awkwardly. */
.grid-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.1rem;
}

@media (max-width: 720px) {
  .grid-tiles {
    grid-template-columns: 1fr;
  }
}

/* Amber variant of .note, for consequences a reader must not skim past. */
.note.warn {
  border-left-color: var(--warn);
  background: rgba(251, 191, 36, 0.09);
}

.note.warn strong {
  color: var(--warn);
}

.tag.warn {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #431407;
}

/* Consequence list: one-way changes, spelled out rather than buried in prose. */
.consequences {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}

.consequences li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 0.8rem;
}

.consequences li::before {
  content: "!";
  position: absolute;
  left: 0;
  top: 0.05rem;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: rgba(251, 191, 36, 0.18);
  color: var(--warn);
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
  line-height: 1.1rem;
}

.consequences li strong {
  color: var(--heading);
}