/* PSF Guard site — hand-rolled, dependency-free. Dark astro theme. */

:root {
  color-scheme: dark;
  --bg: #070b14;
  --bg-raised: #0d1424;
  --bg-card: #0f172acc;
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.3);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --teal: #5eead4;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --grad: linear-gradient(100deg, #5eead4, #818cf8 55%, #a78bfa);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --maxw: 72rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Subtle starfield behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 78% 12%, rgba(255,255,255,.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 45%, rgba(180,220,255,.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 30% 78%, rgba(255,255,255,.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 62%, rgba(255,255,255,.45) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 5% 55%, rgba(200,190,255,.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 68% 88%, rgba(255,255,255,.3) 50%, transparent 51%),
    radial-gradient(ellipse 90rem 40rem at 70% -10%, rgba(94, 234, 212, 0.06), transparent 60%),
    radial-gradient(ellipse 70rem 40rem at 10% 110%, rgba(167, 139, 250, 0.07), transparent 60%);
  background-size: 520px 520px, 520px 520px, 520px 520px, 520px 520px,
                   520px 520px, 520px 520px, 520px 520px, 100% 100%, 100% 100%;
}

a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
code, pre { font-family: var(--mono); font-size: 0.92em; }
code { background: rgba(148,163,184,.12); padding: .12em .4em; border-radius: 5px; }
pre {
  background: #0a1120;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.55;
}
pre code { background: none; padding: 0; }
pre .c { color: #64748b; }   /* comment */
pre .p { color: var(--teal); } /* prompt/binary */

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.015em; }
h2 { font-size: 1.7rem; margin-top: 2.6rem; }
h3 { font-size: 1.2rem; margin-top: 2rem; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2rem 0;
  font-size: 0.95rem;
}
th, td { border: 1px solid var(--border); padding: .5rem .75rem; text-align: left; vertical-align: top; }
th { background: rgba(148,163,184,.08); font-weight: 600; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(7, 11, 20, 0.82);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.brand {
  display: flex; align-items: center; gap: .6rem;
  font-weight: 700; font-size: 1.06rem; color: var(--text);
}
.brand img { width: 30px; height: 30px; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 1.2rem; margin-left: auto; align-items: center; }
.nav-links a { color: var(--text-dim); font-size: .95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.cta {
  color: #06231d;
  background: var(--grad);
  padding: .42rem .9rem;
  border-radius: 8px;
  font-weight: 600;
}

/* ---------- Splash ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 5rem 1.25rem 3.2rem;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 3rem;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  margin: 0 0 1rem;
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lede { color: var(--text-dim); font-size: 1.12rem; margin-bottom: 1.8rem; }
.hero-logo { width: 64px; height: 64px; margin-bottom: 1.2rem; }
.btn-row { display: flex; gap: .8rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: .65rem 1.25rem;
  border-radius: 9px;
  font-weight: 600;
  font-size: .98rem;
  border: 1px solid var(--border-strong);
  color: var(--text);
}
.btn:hover { text-decoration: none; border-color: var(--teal); }
.btn.primary { background: var(--grad); color: #06231d; border: none; }
.btn.primary:hover { filter: brightness(1.08); }
.hero-shot img {
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  box-shadow: 0 24px 80px -20px rgba(94, 234, 212, 0.18), 0 12px 40px rgba(0,0,0,.5);
}
.hero-shot figcaption { text-align: center; color: var(--text-dim); font-size: .85rem; margin-top: .6rem; }

.strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: rgba(13, 20, 36, .55);
}
.strip-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.2rem 1.25rem;
  font-size: 1.05rem;
  color: var(--text-dim);
}
.strip-inner strong { color: var(--text); }

.section { max-width: var(--maxw); margin: 0 auto; padding: 3.6rem 1.25rem 1rem; }
.section > h2 { margin-top: 0; font-size: 1.9rem; }
.section > .sub { color: var(--text-dim); max-width: 46rem; margin-top: -0.4rem; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.1rem;
  margin-top: 2rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.3rem 1.4rem;
}
.card h3 { margin: .4rem 0 .5rem; font-size: 1.07rem; }
.card p { margin: 0; color: var(--text-dim); font-size: .95rem; }
.card .icon { font-size: 1.4rem; }

.shot-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  margin: 1.8rem 0;
}
.shot-pair figure, .gallery figure { margin: 0; }
.shot-pair img, .gallery img {
  border-radius: 10px;
  border: 1px solid var(--border);
  width: 100%;
}
.shot-pair figcaption, .gallery figcaption {
  font-size: .86rem; color: var(--text-dim); margin-top: .5rem; text-align: center;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.1rem;
  margin-top: 2rem;
}

.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.1rem;
  margin-top: 2rem;
}
.install-grid .card h3 { display: flex; align-items: center; gap: .5rem; margin-top: 0; }
.install-grid pre { margin: .8rem 0 0; font-size: .82rem; }
.install-grid p { margin: .4rem 0 0; }

.footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 2.2rem 1.25rem 3rem;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.4rem;
  color: var(--text-dim);
  font-size: .92rem;
  align-items: center;
}
.footer a { color: var(--text-dim); }
.footer a:hover { color: var(--text); }

/* Callout */
.callout {
  border: 1px solid rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.07);
  border-radius: 10px;
  padding: .9rem 1.15rem;
  margin: 1.4rem 0;
  font-size: .96rem;
}
.callout.info {
  border-color: rgba(94, 234, 212, 0.3);
  background: rgba(94, 234, 212, 0.06);
}

/* ---------- Docs layout ---------- */
.docs-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3rem;
  align-items: start;
}
.docs-nav {
  position: sticky;
  top: 4.4rem;
  font-size: .93rem;
}
.docs-nav h4 {
  margin: 1.1rem 0 .35rem;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-dim);
}
.docs-nav ul { list-style: none; margin: 0; padding: 0; }
.docs-nav li { margin: .18rem 0; }
.docs-nav a { color: var(--text-dim); display: block; padding: .18rem .55rem; border-radius: 6px; }
.docs-nav a:hover { color: var(--text); text-decoration: none; background: rgba(148,163,184,.08); }
.docs-nav a.active { color: var(--teal); background: rgba(94,234,212,.08); font-weight: 600; }

.docs-main { min-width: 0; }
.docs-main h1 { font-size: 2.1rem; margin-top: 0.4rem; }
.docs-main .lede { color: var(--text-dim); font-size: 1.08rem; }
.docs-main img { border: 1px solid var(--border); border-radius: 10px; }
.docs-main figure { margin: 1.6rem 0; }
.docs-main figcaption { color: var(--text-dim); font-size: .87rem; margin-top: .5rem; }

.kbd-table td:first-child, .kbd-table td:nth-child(3) { font-family: var(--mono); white-space: nowrap; }

.next-prev {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.2rem;
  border-top: 1px solid var(--border);
  padding-top: 1.4rem;
  font-size: .95rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 3rem; }
  .docs-wrap { grid-template-columns: 1fr; gap: 1.4rem; }
  .docs-nav { position: static; border: 1px solid var(--border); border-radius: 10px; padding: .8rem 1rem; }
  .shot-pair { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav-links { gap: .8rem; }
  .nav-links a:not(.cta):not(.keep) { display: none; }
}

/* ---------- Lightbox ---------- */
.lb-zoomable { cursor: zoom-in; }
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(4, 6, 12, 0.92);
  backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.lightbox.show { display: flex; }
.lightbox figure {
  margin: 0;
  max-width: 96vw;
  max-height: 94vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
}
.lightbox img {
  max-width: 96vw;
  max-height: 86vh;
  width: auto;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  box-shadow: 0 30px 90px rgba(0,0,0,.7);
}
.lightbox figcaption {
  color: var(--text-dim);
  font-size: .92rem;
  text-align: center;
  max-width: 70rem;
  display: flex;
  gap: 1.2rem;
  align-items: baseline;
  flex-wrap: wrap;
  justify-content: center;
}
.lightbox .lb-full { color: var(--teal); white-space: nowrap; cursor: pointer; }
.lightbox .lb-close {
  position: fixed;
  top: 1rem;
  right: 1.2rem;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
}
.lightbox .lb-close:hover { color: var(--text); }