:root {
  --bg: #ffffff;
  --text: #2b2b2b;
  --heading: #1e1e1e;
  --muted: #555b60;
  --rule: #b8bcc0;
  --panel: #eef0f1;
  --panel-strong: #e1e3e5;
  --icon-bg: #bfc3c6;
  --icon-fg: #ffffff;
  --ink: #202d36;
  --accent: #dc452e;
  --link: #b23420;
  --band: #3a3d40;
  --band-text: #f1f2f3;
  --head-bg: #ffffff;
  --head-text: #2b2b2b;
  --head-rule: #b8bcc0;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --text: #dfe2e5;
    --heading: #f3f4f5;
    --muted: #a5abb0;
    --rule: #3c4247;
    --panel: #1f2327;
    --panel-strong: #282d32;
    --icon-bg: #3f454b;
    --icon-fg: #e7e9eb;
    --ink: #e7e9eb;
    --accent: #f0735e;
    --link: #f58a77;
    --band: #0d0f11;
    --band-text: #dfe2e5;
    /* The logo is in its own colors in both themes, so the header stays a light band. */
    --head-bg: #eef0f1;
    --head-text: #202d36;
    --head-rule: #0d0f11;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.55;
  overflow-wrap: break-word;
}

a { color: var(--link); text-underline-offset: 0.18em; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

h1, h2, h3 {
  font-family: "Segoe UI Light", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  font-weight: 300;
  color: var(--heading);
  line-height: 1.15;
  margin: 0;
}
h1 { font-size: clamp(2.4rem, 7vw, 3.6rem); margin: 0 0 1.25rem; }
h2 { font-size: clamp(1.7rem, 4.5vw, 2.3rem); margin: 0 0 1rem; }
h3 { font-size: 1.3rem; margin: 0 0 0.5rem; }
h4 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

p { margin: 0 0 0.9rem; }
ul { margin: 0 0 1rem; padding-left: 1.2rem; }
li { margin: 0 0 0.35rem; }

.wrap { max-width: 68rem; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* Header */
.site-head { background: var(--head-bg); border-bottom: 1px solid var(--head-rule); }
.site-head .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}
.logo { display: block; line-height: 0; }
.logo img { width: 160px; height: auto; }
.site-head nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}
.site-head nav li { margin: 0; }
.site-head nav a { color: var(--head-text); text-decoration: none; }
.site-head nav a:hover { color: #b23420; text-decoration: underline; }
.site-head a:focus-visible { outline-color: #b23420; }

/* Sections */
section { padding: 3.25rem 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }
.kicker {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.lead { font-size: 1.2rem; max-width: 46rem; }
.intro { max-width: 46rem; }

/* Hero */
.hero { padding-top: 3rem; }
.hero-grid { display: grid; gap: 2rem; }
@media (min-width: 860px) { .hero-grid { grid-template-columns: 1.4fr 1fr; align-items: start; } }
.points { list-style: none; padding: 0; margin: 0 0 1.5rem; }
.points li { padding-left: 1.4rem; position: relative; margin-bottom: 0.6rem; }
.points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--accent);
}
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 0; }
.button {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.button.primary { background: var(--ink); color: var(--bg); }
.button:hover { border-color: var(--accent); color: var(--accent); }
.button.primary:hover { background: var(--heading); border-color: var(--heading); color: var(--bg); text-decoration: underline; }

/* Layouts */
.two { display: grid; gap: 2rem; }
@media (min-width: 860px) { .two { grid-template-columns: 1fr 1fr; gap: 3rem; } }
.three { display: grid; gap: 2rem; }
@media (min-width: 860px) { .three { grid-template-columns: repeat(3, 1fr); } }

.diagram { width: 100%; max-width: 26rem; height: auto; display: block; margin: 0 auto; }
.diagram .box { fill: var(--panel-strong); }
.diagram .box.device { fill: var(--icon-bg); }
.diagram .t { fill: var(--heading); font-size: 3.6px; }
.diagram .s { fill: var(--muted); font-size: 2.5px; }
.diagram .t.device { fill: var(--icon-fg); font-size: 3.1px; }
.diagram .arrows { stroke: var(--muted); stroke-width: 0.5; fill: none; }
.diagram .head { fill: var(--muted); }
.diagram text { font-family: inherit; }

.box-note {
  border: 1px solid var(--rule);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 0;
}
.box-note p:last-child { margin-bottom: 0; }

/* Feature grid */
.group { margin-top: 2.25rem; }
.group > h3 { border-top: 1px solid var(--rule); padding-top: 0.75rem; margin-bottom: 1rem; }
.features { display: grid; gap: 1.25rem 2.5rem; }
@media (min-width: 760px) { .features { grid-template-columns: 1fr 1fr; } }
.feat { display: grid; grid-template-columns: 2.6rem 1fr; gap: 0.9rem; align-items: start; }
.feat p { margin: 0; }
.ico {
  width: 2.6rem;
  height: 2.6rem;
  background: var(--icon-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ico svg { width: 1.7rem; height: 1.7rem; stroke: var(--icon-fg); fill: none; stroke-width: 0.9; }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--text);
  border: 1px solid var(--muted);
  border-radius: 3px;
  padding: 0 0.4rem;
  margin: 0 0.15rem;
  vertical-align: 0.1em;
  white-space: nowrap;
}
.tag.p { border-style: dashed; }
.tag.l { color: var(--muted); border-color: var(--rule); background: var(--panel-strong); }

.legend {
  font-size: 0.95rem;
  color: var(--muted);
  background: var(--panel);
  padding: 0.6rem 0.9rem;
  margin: 0 0 1.5rem;
  max-width: 46rem;
}
.legend .tag { margin-left: 0.6rem; }
.legend .tag:first-child { margin-left: 0; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 0 0 1.5rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
caption {
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0 0.4rem;
}
th, td { text-align: left; vertical-align: top; padding: 0.5rem 0.7rem; border-bottom: 1px solid var(--rule); }
th { font-weight: 600; width: 34%; }
tbody tr:nth-child(odd) { background: var(--panel); }

/* Status lists */
.stand h3 { margin-bottom: 0.75rem; }
.stand ul { padding-left: 1.1rem; }

/* Links */
.links { list-style: none; padding: 0; }
.links li { margin-bottom: 0.6rem; }
.links span { color: var(--muted); }

/* Footer */
.site-foot { background: var(--band); color: var(--band-text); padding: 2rem 0; font-size: 0.9rem; }
.site-foot a { color: var(--band-text); }
.site-foot p { margin: 0 0 0.5rem; }