/* SelfHost Stack — spec-sheet design system
   Palette: cool paper #EEF0F3 / surface #FFF / ink #0E1726 / cable blue #2749F0
   LED green #2FBF71 (status dots only) / amber #E8A13D (warnings only) */

:root {
  --bg: #EEF0F3;
  --surface: #FFFFFF;
  --ink: #0E1726;
  --muted: #5B6472;
  --line: #D8DCE2;
  --accent: #2749F0;
  --led: #2FBF71;
  --amber: #E8A13D;
  --radius: 6px;
  --maxw: 880px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: "IBM Plex Mono", ui-monospace, monospace; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}
.logo {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.logo .dot { color: var(--led); }
.site-nav a {
  color: var(--muted);
  font-size: 14px;
  margin-left: 18px;
}

/* ---------- hero ---------- */
.hero { padding: 64px 0 48px; }
.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
h1 {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: clamp(30px, 5.5vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  max-width: 18ch;
}
.hero p.lede {
  margin-top: 18px;
  font-size: 19px;
  color: var(--muted);
  max-width: 56ch;
}

/* ---------- rack-unit cards (signature element) ---------- */
.rack { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 28px 0; background: var(--surface); }
.rack-unit {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}
.rack-unit:last-child { border-bottom: none; }
a.rack-unit:hover { background: #F6F8FB; text-decoration: none; }
.led {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--led);
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(47,191,113,.15);
}
.led.amber { background: var(--amber); box-shadow: 0 0 0 3px rgba(232,161,61,.15); }
.rack-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 15px;
  font-weight: 600;
  min-width: 150px;
}
.rack-desc { color: var(--muted); font-size: 15px; flex: 1; }
.rack-tag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}
/* vent-hole texture on the right edge of rack units */
.vents {
  width: 42px; align-self: stretch; flex-shrink: 0;
  background-image: radial-gradient(var(--line) 1.2px, transparent 1.2px);
  background-size: 7px 7px;
  opacity: .8;
}

/* ---------- content sections ---------- */
main section { padding: 34px 0; }
h2 {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
h3 {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 19px;
  margin: 26px 0 8px;
}
p + p { margin-top: 12px; }
ul.plain { margin: 12px 0 0 22px; }
ul.plain li { margin-bottom: 8px; }

/* TL;DR pick box */
.pick {
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px 20px;
  margin: 22px 0;
}
.pick .eyebrow { margin-bottom: 8px; color: var(--ink); }

/* spec table */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); margin: 20px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 640px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); }
th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: #F6F8FB;
}
tr:last-child td { border-bottom: none; }
td:first-child { font-weight: 600; }

/* callout */
.callout {
  border-left: 3px solid var(--amber);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15.5px;
  color: var(--muted);
}

/* buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  padding: 10px 18px;
  border-radius: var(--radius);
  margin-top: 10px;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 28px 0 40px;
  font-size: 13.5px;
  color: var(--muted);
}
.site-footer p + p { margin-top: 10px; }

@media (max-width: 620px) {
  .rack-desc { display: none; }
  .rack-name { min-width: 0; }
  .vents { width: 26px; }
}

@media (prefers-reduced-motion: no-preference) {
  .led { animation: pulse 2.4s ease-in-out infinite; }
  @keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 3px rgba(47,191,113,.15); }
    50% { box-shadow: 0 0 0 5px rgba(47,191,113,.28); }
  }
}