/* ESP32 Tailnet Gateway website. Black/green tokens follow assets/brand/BRAND.md. */
:root {
  --bg: #0A0F0C; --surface: #0E1511; --card: #111814; --line: #1C2A22;
  --text: #E3ECE6; --muted: #8DA397; --accent: #1FC97A; --accent-text: #1FC97A;
  --accent-ink: #04130B; --off: #2E6B4C; --input: #1FC97A; --amber: #F5A524; --danger: #F85149; --code: #111814;
  --radius: 12px; --max: 1120px;
  --font: Inter, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #FFFFFF; --surface: #F4F7F5; --card: #FFFFFF; --line: #D3DED7;
    --text: #0A0F0C; --muted: #4F6158; --accent: #0B7A4B; --accent-text: #0B7A4B;
    --accent-ink: #FFFFFF; --off: #0A0F0C; --input: #0A0F0C; --amber: #9A6700; --danger: #CF222E; --code: #F4F7F5;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #FFFFFF; --surface: #F4F7F5; --card: #FFFFFF; --line: #D3DED7;
  --text: #0A0F0C; --muted: #4F6158; --accent: #0B7A4B; --accent-text: #0B7A4B;
  --accent-ink: #FFFFFF; --off: #0A0F0C; --input: #0A0F0C; --amber: #9A6700; --danger: #CF222E; --code: #F4F7F5;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--font); }
a { color: var(--accent-text); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img, svg { max-width: 100%; height: auto; }
code { font: 0.9em var(--mono); background: var(--code); border: 1px solid var(--line); border-radius: 6px; padding: 0.1em 0.35em; }
pre { position: relative; background: var(--code); border: 1px solid var(--line); border-radius: 10px; padding: 16px; overflow-x: auto; }
pre code { border: 0; padding: 0; background: none; }
.copy { position: absolute; top: 8px; right: 8px; font: 12px var(--font); padding: 4px 10px; border-radius: 6px;
  border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
table { width: 100%; border-collapse: collapse; margin: 16px 0; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 14px; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(30px, 5vw, 44px); margin: 8px 0 16px; }
h2 { font-size: clamp(22px, 3vw, 28px); margin: 40px 0 12px; }
h3 { font-size: 19px; margin: 28px 0 8px; }
p, li { max-width: 72ch; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 92%, transparent); border-bottom: 1px solid var(--line); backdrop-filter: blur(8px); }
.top-inner { max-width: var(--max); margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 650; white-space: nowrap; min-height: 44px; }
.site-nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 2px 12px; margin: 0; padding: 0; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 15px; padding: 6px 2px; display: inline-block; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }
.site-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); }
.tools { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.tools button, .tools .gh { font: 14px var(--font); color: var(--text); background: var(--card); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; cursor: pointer; text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.tools .menu { display: none; }
/* Ko-fi support: always in the sticky header (dark text on the Ko-fi colour, about 7:1). */
.tools .kofi { font: 600 14px var(--font); color: #0A0F0C; background: #FF5E5B; border: 1px solid #FF5E5B; border-radius: 8px;
  padding: 6px 12px; text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.tools .kofi:hover, .tools .kofi:focus-visible { background: #FF7D7A; border-color: #FF7D7A; }
.tools .kofi svg { width: 18px; height: 18px; fill: currentColor; }
.tools .kofi .emoji { font-style: normal; filter: drop-shadow(0 0 1px #fff) drop-shadow(0 0 1px #fff); }
.tools .icon { width: 44px; justify-content: center; padding: 0; }
.icon svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.icon svg .fill { fill: currentColor; stroke: none; }

.search-panel { position: fixed; inset: 64px 16px auto; max-width: 640px; margin: 0 auto; z-index: 20; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: 0 16px 48px rgba(0,0,0,.35); }
.search-panel label { font-weight: 600; display: block; margin-bottom: 6px; }
.search-panel input { width: 100%; font: 16px var(--font); padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); }
#search-results { list-style: none; padding: 0; margin: 12px 0; max-height: 50vh; overflow-y: auto; }
#search-results li { padding: 8px 0; border-bottom: 1px solid var(--line); }
#search-results small { display: block; color: var(--muted); }
.search-close { font: 14px var(--font); background: none; border: 1px solid var(--line); color: var(--text); border-radius: 8px; padding: 6px 10px; cursor: pointer; }

.layout { max-width: var(--max); margin: 0 auto; padding: 8px 16px 64px; }
.layout.with-sidebar { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; }
.sidebar nav { position: sticky; top: 76px; padding-top: 24px; }
.sidebar .side-h { font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 16px 0 6px; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar a { display: block; padding: 8px 10px; border-radius: 6px; color: var(--muted); text-decoration: none; font-size: 15px; }
.sidebar a[aria-current="page"], .sidebar a:hover { color: var(--text); background: var(--surface); }
main:focus { outline: none; }

.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 20px 0 0; font-size: 14px; color: var(--muted); }
.crumbs li + li::before { content: "/"; margin-right: 6px; }
.crumbs a { color: var(--muted); }

.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: center; padding: 56px 0 24px; }
.eyebrow { color: var(--accent-text); font-weight: 600; letter-spacing: .2em; text-transform: uppercase; font-size: 14px; margin: 0; }
.hero h1 { font-size: clamp(34px, 6vw, 56px); margin: 8px 0 12px; }
.lead { font-size: 20px; color: var(--muted); max-width: 40ch; }
.tagline { font-size: 22px; font-weight: 600; margin: 0 0 8px; }
.tagline span { color: var(--accent-text); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.boards { margin-top: 18px; font-size: 15px; color: var(--muted); }
.boards strong { color: var(--text, inherit); }
.btn { display: inline-flex; align-items: center; min-height: 44px; padding: 10px 18px; border-radius: 10px; font-weight: 600; text-decoration: none; border: 1px solid var(--line); color: var(--text); background: var(--card); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.roles { width: 100%; }
.roles .hole, .roles .nodes circle { fill: var(--bg); } .roles { color: var(--input); } .roles .muted-line { stroke: var(--off); } .roles .nodes .lit { fill: var(--accent); } .roles .lit { stroke: var(--accent); fill: var(--accent); }
.roles text { fill: var(--muted); font: 15px var(--font); } .roles text.on { fill: var(--text); font-weight: 650; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 20px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.card h3 { margin-top: 0; }
.card p { margin: 0 0 8px; color: var(--muted); }
.badge { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.badge.on { color: var(--accent-text); border-color: var(--accent); }
.note { border-left: 4px solid var(--amber); background: var(--surface); padding: 12px 16px; border-radius: 0 10px 10px 0; margin: 20px 0; }
.note.ok { border-left-color: var(--accent); }
.flasher { margin: 24px 0; min-width: 0; }
.flasher h2 { margin: 0 0 8px; font-size: 24px; }
.flasher esp-web-install-button { display: block; max-width: 100%; margin-top: 16px; }
.flasher-message { display: block; margin: 0; overflow-wrap: anywhere; }
.flasher-message strong { display: block; margin-bottom: 8px; }
.flasher-message p { margin: 0 0 12px; color: var(--text); }
.flasher-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.flasher .btn, .install-alternative .btn { max-width: 100%; white-space: normal; text-align: center; justify-content: center; font: inherit; font-weight: 600; }
.flasher .flasher-help { margin: 16px 0 0; font-size: 14px; }
.install-alternative { margin: 20px 0; }
.install-alternative h2 { margin-top: 0; font-size: 22px; }
@media (max-width: 480px) {
  .flasher, .install-alternative { padding: 16px; }
  .flasher-message { padding: 12px; }
  .flasher-actions { flex-direction: column; }
  .flasher-actions .btn, .install-alternative .btn { width: 100%; }
}
figure { margin: 24px 0; }
figure img { border-radius: var(--radius); border: 1px solid var(--line); display: block; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 8px; }
.ui-preview { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: 28px; align-items: start; margin: 24px 0 40px; }
.ui-preview > a { display: block; }
.ui-preview img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.ui-shot { margin: 0; }
.ui-preview > div h3:first-child { margin-top: 0; }
@media (max-width: 760px) { .ui-preview { grid-template-columns: minmax(0, 1fr); } }
details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 10px 0; background: var(--surface); }
summary { cursor: pointer; font-weight: 600; }

.foot { border-top: 1px solid var(--line); background: var(--surface); }
.foot-inner { max-width: var(--max); margin: 0 auto; padding: 24px 16px; font-size: 14px; color: var(--muted); }

@media (max-width: 900px) {
  .layout.with-sidebar { display: flex; flex-direction: column-reverse; }
  .sidebar { border-top: 1px solid var(--line); margin-top: 32px; }
  .sidebar nav { position: static; padding-top: 8px; }
  .sidebar ul { display: flex; flex-wrap: wrap; gap: 4px; }
  .hero { grid-template-columns: 1fr; padding-top: 32px; }
}
@media (max-width: 760px) {
  .tools .menu { display: inline-flex; }
  .top-inner { flex-wrap: wrap; gap: 8px; }
  .site-nav { order: 3; width: 100%; display: none; }
  .tools { gap: 6px; }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav a { padding: 10px 2px; display: block; }
  .tools .gh { display: none; }
  .brand span { font-size: 15px; }
}
/* The header row is tight: the Ko-fi link is a heart-only button below
 * 1200 px and "Support me! ❤️" above, where the header may grow wider than the
 * content column; GitHub stays in the footer below 900 px. */
@media (max-width: 1199px) {
  .tools .kofi { width: 44px; padding: 0; justify-content: center; }
  .tools .kofi span { display: none; }
}
@media (min-width: 1200px) {
  .top-inner { max-width: 1360px; }
  .tools .kofi svg { display: none; }
}
@media (max-width: 899px) { .tools .gh { display: none; } }
@media (max-width: 700px) {
  figure.diagram { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  figure.diagram img { min-width: 820px; max-width: none; }
  figure.diagram figcaption::after { content: " Swipe sideways to see the whole diagram."; }
}
@media (max-width: 389px) { .brand span { display: none; } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }
.release-note { margin: 0 0 2rem; padding: 1rem 1.2rem; border: 1px solid var(--line); border-left: 3px solid #1FC97A; border-radius: 12px; font-size: .94rem; line-height: 1.65; }
.release-note strong { display: block; margin-bottom: .3rem; }
@media print { .top, .sidebar, .foot, .copy { display: none; } }