/* usque for OpenWrt — static site styles.
   Plain CSS, no frameworks, no external assets. Light + dark via prefers-color-scheme. */

/* ---------- design tokens ---------- */
:root {
  color-scheme: light dark;
  --bg: #faf8f5;
  --bg-elev: #ffffff;
  --bg-sunken: #f2eee8;
  --text: #17181c;
  --muted: #53565e;
  --border: #e3ded6;
  --border-strong: #cfc8bc;
  --accent: #c2410c;
  --accent-strong: #9a3412;
  --accent-soft: #fff0e3;
  --accent-line: #f6821f;
  --on-accent: #ffffff;
  --code-bg: #17181b;
  --code-text: #f2efe9;
  --code-muted: #9ba1ab;
  --code-border: #2c2f35;
  --note-bg: #eef4fd;
  --note-border: #2563eb;
  --warn-bg: #fff5e6;
  --warn-border: #d97706;
  --ok: #15803d;
  --ok-soft: #edf8f0;
  --shadow: 0 1px 2px rgba(23, 24, 28, .05), 0 12px 28px -18px rgba(23, 24, 28, .35);
  --radius: 14px;
  --radius-sm: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --header-h: 3.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f11;
    --bg-elev: #16181c;
    --bg-sunken: #1c1f24;
    --text: #f1efeb;
    --muted: #a9aeb8;
    --border: #2a2d33;
    --border-strong: #3a3e46;
    --accent: #ffa04d;
    --accent-strong: #ffbe7a;
    --accent-soft: #2b1d12;
    --accent-line: #f6821f;
    --on-accent: #1a1208;
    --code-bg: #0a0b0d;
    --code-text: #f2efe9;
    --code-muted: #8b919b;
    --code-border: #2a2d33;
    --note-bg: #10202f;
    --note-border: #4b8ef7;
    --warn-bg: #2a2113;
    --warn-border: #e0a13a;
    --ok: #4ade80;
    --ok-soft: #10261a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 16px 32px -20px rgba(0, 0, 0, .8);
  }
}

/* ---------- reset / base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  letter-spacing: -.015em;
  margin: 0 0 .5em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.15rem, 5.5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.55rem, 3.4vw, 2.05rem); font-weight: 750; }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.35rem); font-weight: 700; margin-top: 2rem; }
h4 { font-size: 1.02rem; font-weight: 700; margin: .25rem 0 .35rem; }

p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem; }

a {
  color: var(--accent-strong);
  text-decoration-thickness: .08em;
  text-underline-offset: .16em;
}
a:hover { text-decoration-thickness: .14em; }

strong { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--accent-line);
  outline-offset: 2px;
  border-radius: 4px;
}

img, svg { max-width: 100%; }

/* ---------- utilities ---------- */
.wrap {
  width: min(100% - 2.5rem, 70rem);
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: .75rem;
  left: .75rem;
  z-index: 100;
  padding: .6rem .9rem;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: 999px;
  font-weight: 650;
  text-decoration: none;
  transform: translateY(-250%);
  transition: transform .15s ease;
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg); /* fallback for browsers without color-mix() */
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--text);
  text-decoration: none;
  flex: 0 0 auto;
}
.brand-mark {
  width: 1.9rem;
  height: 1.9rem;
  color: var(--accent-line);
  border-radius: 8px;
  flex: 0 0 auto;
}
.brand-text { font-weight: 800; letter-spacing: -.02em; }
.brand-sub {
  font-weight: 500;
  color: var(--muted);
  font-size: .88rem;
  letter-spacing: 0;
}

.site-nav { margin-left: auto; }
.site-nav ul {
  display: flex;
  gap: .15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}
.site-nav ul::-webkit-scrollbar { display: none; }
.site-nav a {
  display: inline-block;
  padding: .4rem .65rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: .875rem;
  font-weight: 550;
  text-decoration: none;
}
.site-nav a:hover {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

/* ---------- hero ---------- */
.hero {
  padding-block: clamp(2.75rem, 7vw, 5.5rem) clamp(2.5rem, 5vw, 4rem);
  background: var(--bg); /* fallback for browsers without color-mix() */
  background:
    radial-gradient(58rem 26rem at 12% -8%, var(--accent-soft) 0%, transparent 62%),
    radial-gradient(42rem 22rem at 95% 0%, color-mix(in srgb, var(--note-border) 10%, transparent) 0%, transparent 65%);
}
.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: .3rem .7rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--muted);
  font-size: .78rem;
  font-weight: 650;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.hero h1 { max-width: 22ch; margin-bottom: .6rem; }
.lede {
  max-width: 48rem;
  font-size: clamp(1.03rem, 1.9vw, 1.18rem);
  color: var(--muted);
}
.lede strong { color: var(--text); }

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  list-style: none;
  margin: 1.1rem 0 .9rem;
  padding: 0;
}
.pills li {
  padding: .28rem .65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--muted);
  font-size: .8rem;
  font-weight: 550;
}
.status-note {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  margin: 0 0 1.5rem;
  font-size: .88rem;
  color: var(--muted);
}
.status-note .dot {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--warn-border);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, .22); /* fallback */
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn-border) 22%, transparent);
  flex: 0 0 auto;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-bottom: 1.5rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .7rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 650;
  font-size: .95rem;
  text-decoration: none;
  transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent-line);
  color: #1a1208;
  box-shadow: var(--shadow);
}
.btn-primary:hover { background: #ff9639; }
.btn-secondary {
  background: var(--bg-elev);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-secondary:hover { background: var(--bg-sunken); }
.btn-ghost {
  color: var(--accent-strong);
  padding-inline: .85rem;
}
.btn-ghost:hover { background: var(--accent-soft); }

.hero-meta {
  margin: 0;
  font-size: .88rem;
  color: var(--muted);
}

/* ---------- sections ---------- */
main > section {
  padding-block: clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + .75rem);
}
main > section:first-of-type { border-top: 0; }
section > .wrap > h2 { margin-bottom: .4rem; }
.section-lede {
  max-width: 52rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.fineprint {
  font-size: .875rem;
  color: var(--muted);
}
.bullets { padding-left: 1.25rem; }
.bullets li { margin-bottom: .5rem; }

/* cards */
.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  margin: 1.25rem 0;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem .9rem;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 .35rem; font-size: 1.02rem; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; }

/* traffic flow */
.flow {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 1.25rem;
  counter-reset: flow;
  align-items: stretch;
}
.flow li {
  position: relative;
  flex: 1 1 9rem;
  padding: .7rem .85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  font-weight: 650;
  font-size: .9rem;
}
.flow li::after {
  content: "→";
  position: absolute;
  right: -.62rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: .9rem;
  z-index: 1;
}
.flow li:last-child::after { content: none; }
.flow-sub {
  display: block;
  font-weight: 500;
  font-size: .78rem;
  color: var(--muted);
}

/* two-state comparison (routing off vs on) */
.two-up {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  margin: 1.1rem 0 1.5rem;
}
.flow-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 1rem 1.15rem .95rem;
  box-shadow: var(--shadow);
}
.flow-block h4 {
  margin: 0 0 .55rem;
  font-size: 1rem;
}
.flow-block .flow {
  margin: .4rem 0 .65rem;
  gap: .45rem;
}
.flow-block .flow li {
  flex-basis: 7.5rem;
  padding: .55rem .7rem;
  font-size: .85rem;
}
.flow-block .fineprint {
  margin: 0;
  font-size: .82rem;
}

/* ---------- steps ---------- */
ol.steps {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  counter-reset: step;
  display: grid;
  gap: 1.6rem;
}
ol.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 3.25rem;
}
ol.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -.15rem;
  width: 2.15rem;
  height: 2.15rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-line);
  color: #1a1208;
  font-weight: 750;
  font-size: .95rem;
}
ol.steps h4 + p { margin-top: .2rem; }

/* ---------- code blocks ---------- */
figure.cmd {
  position: relative;
  margin: .9rem 0 1.1rem;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 12px;
  overflow: hidden;
}
figure.cmd pre {
  margin: 0;
  padding: 1rem 1.1rem;
  transition: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  font-family: var(--font-mono);
  font-size: .855rem;
  line-height: 1.62;
  color: var(--code-text);
  tab-size: 2;
}
figure.cmd code {
  font-family: inherit;
  background: none;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}
/* when JS injects the copy button, reserve room above the first line */
figure.cmd.has-copy pre { padding-top: 2.35rem; }
.copy-btn {
  position: absolute;
  top: .45rem;
  right: .45rem;
  padding: .28rem .6rem;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 7px;
  background: rgba(255, 255, 255, .09);
  color: #f2efe9;
  font-family: var(--font-sans);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .01em;
  cursor: pointer;
  opacity: .9;
}
.copy-btn:hover { background: rgba(255, 255, 255, .2); }
.copy-btn.is-copied {
  background: #1f7a44;
  border-color: #2f9e5c;
  color: #fff;
}

/* inline code */
code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .08em .34em;
  overflow-wrap: break-word;
}
figure.cmd code, .footer-meta code, .brand-text code { border: 0; background: none; padding: 0; }

/* ---------- tables ---------- */
.table-wrap {
  margin: 1.1rem 0 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  overflow-x: auto;
  box-shadow: var(--shadow);
}
table {
  width: 100%;
  min-width: 38rem;
  border-collapse: collapse;
  font-size: .92rem;
}
caption { text-align: left; padding: .8rem 1rem 0; color: var(--muted); font-size: .85rem; }
th, td {
  padding: .62rem .85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
thead th {
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--bg-sunken);
  border-bottom: 1px solid var(--border-strong);
}
tbody th { font-weight: 650; white-space: nowrap; }
tbody tr:last-child th,
tbody tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td { color: var(--muted); }
td strong { color: var(--text); }

/* ---------- callouts ---------- */
.callout {
  margin: 1.25rem 0;
  padding: .9rem 1.1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--note-border);
  border-radius: var(--radius-sm);
  background: var(--note-bg);
  font-size: .93rem;
}
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout.warn {
  border-left-color: var(--warn-border);
  background: var(--warn-bg);
}
.callout.ok {
  border-left-color: var(--ok);
  background: var(--ok-soft);
}

/* ---------- details / FAQ ---------- */
details.faq {
  margin: 0 0 .7rem;
  padding: .85rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  scroll-margin-top: calc(var(--header-h) + .75rem);
}
details.faq[open] { box-shadow: var(--shadow); }
details.faq summary {
  cursor: pointer;
  font-weight: 650;
  line-height: 1.45;
  padding-left: .2rem;
}
details.faq summary:hover { color: var(--accent-strong); }
details.faq[open] summary { margin-bottom: .7rem; }
details.faq > :last-child { margin-bottom: 0; }

/* ---------- screenshots (used once assets exist) ---------- */
figure.screenshot {
  margin: 1.5rem 0;
}
figure.screenshot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
figure.screenshot figcaption {
  margin-top: .55rem;
  font-size: .85rem;
  color: var(--muted);
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-sunken);
  padding-block: 2rem 2.5rem;
  font-size: .88rem;
  color: var(--muted);
}
.footer-main {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem 2rem;
  margin-bottom: 1rem;
}
.footer-brand { margin: 0; max-width: 34rem; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem 1.5rem;
  margin: 0;
  font-size: .82rem;
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .site-header .wrap {
    flex-wrap: wrap;
    gap: .35rem;
    padding-block: .5rem;
  }
  .site-header { position: static; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .site-nav { width: 100%; margin-left: 0; }
  .site-nav ul { padding-bottom: .15rem; }
  main > section, details.faq { scroll-margin-top: 1rem; }
  .hero { padding-top: 2.25rem; }
  ol.steps > li { padding-left: 2.75rem; }
  ol.steps > li::before { width: 1.85rem; height: 1.85rem; font-size: .85rem; }
  .flow li { flex: 1 1 100%; }
  .flow li::after { content: "↓"; right: auto; left: 50%; top: auto; bottom: -.85rem; transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

@media print {
  .site-header, .actions, .copy-btn, .skip-link { display: none !important; }
  body { background: #fff; color: #000; }
  figure.cmd { background: #f4f4f4; border-color: #ccc; }
  figure.cmd pre, figure.cmd code { color: #111; }
  a { color: #000; }
  main > section { break-inside: avoid-page; }
}