/* SynapseOS — site styles. Brand: #a78bfa on #0a0a12. */

:root {
  --bg:        #0a0a12;
  --bg-raise:  #11101c;
  --bg-sunk:   #07070e;
  --line:      #221f36;
  --ink:       #e8e6f2;
  --ink-dim:   #a9a4c4;
  --ink-faint: #6f6a8d;
  --brand:     #a78bfa;
  --brand-dim: #7c5cf0;
  --wrap:      68rem;
  --mono: ui-monospace, "JetBrains Mono", "DejaVu Sans Mono", SFMono-Regular, Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 1.25rem; }

.skip {
  position: absolute; left: -9999px;
  background: var(--brand); color: #12002e;
  padding: .6rem 1rem; border-radius: 0 0 .5rem 0; font-weight: 600; z-index: 50;
}
.skip:focus { left: 0; top: 0; }

a { color: var(--brand); text-underline-offset: .18em; }
a:hover { color: #c4b1ff; }

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

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(10, 10, 18, .86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 3.75rem; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 700; letter-spacing: .01em; color: var(--ink); text-decoration: none;
}
.brand img { display: block; }
.site-header nav {
  display: flex; gap: 1.15rem; flex-wrap: wrap;
  font-size: .95rem;
}
.site-header nav a { color: var(--ink-dim); text-decoration: none; }
.site-header nav a:hover { color: var(--brand); }

/* ---------- hero ---------- */

.hero {
  padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  background:
    radial-gradient(60rem 30rem at 50% -12rem, rgba(167,139,250,.18), transparent 70%),
    linear-gradient(180deg, #0d0b1a, var(--bg));
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.eyebrow {
  margin: 0 0 .75rem;
  font: 600 .78rem/1 var(--mono);
  letter-spacing: .18em; text-transform: uppercase; color: var(--brand);
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.75rem, 9vw, 5rem);
  line-height: 1.02; letter-spacing: -.03em; font-weight: 800;
}
.tagline {
  margin: .5rem 0 1.5rem;
  font-size: clamp(1.15rem, 3.2vw, 1.6rem);
  color: var(--brand); font-weight: 500;
}
.lede {
  max-width: 46rem; margin: 0 auto;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem); color: var(--ink-dim);
}
.lede strong { color: var(--ink); }

.cta { display: flex; gap: .75rem; flex-wrap: wrap; justify-content: center; margin: 2rem 0 0; }
.btn {
  display: inline-block; padding: .7rem 1.4rem;
  border: 1px solid var(--line); border-radius: .6rem;
  background: var(--bg-raise); color: var(--ink);
  font-weight: 600; text-decoration: none;
  transition: border-color .15s, background .15s, transform .15s;
}
.btn:hover { border-color: var(--brand); color: var(--ink); transform: translateY(-1px); }
.btn-primary {
  background: var(--brand); border-color: var(--brand); color: #150033;
}
.btn-primary:hover { background: #bda5ff; border-color: #bda5ff; color: #150033; }
@media (prefers-reduced-motion: reduce) { .btn:hover { transform: none; } }

.status {
  max-width: 44rem; margin: 2.25rem auto 0;
  padding: .85rem 1.1rem;
  border: 1px solid var(--line); border-left: 3px solid var(--brand);
  border-radius: .5rem; background: var(--bg-sunk);
  color: var(--ink-dim); font-size: .95rem; text-align: left;
}
.status strong { color: var(--brand); }

/* ---------- sections ---------- */

.section { padding: clamp(2.75rem, 7vw, 4.5rem) 1.25rem; }
.section + .section { border-top: 1px solid var(--line); }

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 4.5vw, 2.2rem);
  letter-spacing: -.02em; line-height: 1.2;
}
h3 {
  margin: 2rem 0 .5rem;
  font-size: 1.15rem; letter-spacing: -.01em;
}
p { margin: 0 0 1rem; max-width: 62ch; }
p.small, .small { font-size: .9rem; color: var(--ink-faint); }
.small a { color: var(--brand-dim); }

code {
  font: 500 .9em/1.5 var(--mono);
  background: var(--bg-raise); border: 1px solid var(--line);
  padding: .1em .38em; border-radius: .3em; color: #d3c6ff;
}
pre {
  margin: 1rem 0; padding: 1rem 1.1rem;
  background: var(--bg-sunk); border: 1px solid var(--line); border-radius: .6rem;
  overflow-x: auto;
}
pre code {
  background: none; border: 0; padding: 0; color: var(--ink-dim);
  font-size: .875rem; line-height: 1.6; white-space: pre;
}
.diagram code { color: var(--brand); }

kbd {
  font: 500 .82em/1 var(--mono);
  background: var(--bg-raise); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: .35em;
  padding: .25em .45em; color: var(--ink); white-space: nowrap;
}

/* ---------- feature grid ---------- */

.grid {
  list-style: none; margin: 2rem 0 0; padding: 0;
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
}
.grid li {
  padding: 1.25rem 1.35rem;
  background: var(--bg-raise); border: 1px solid var(--line); border-radius: .75rem;
}
.grid h3 { margin: 0 0 .5rem; font-size: 1.05rem; color: var(--brand); }
.grid p { margin: 0; font-size: .95rem; color: var(--ink-dim); max-width: none; }

/* ---------- figures ---------- */

figure { margin: 2rem 0; }
figure img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line); border-radius: .75rem;
  background: var(--bg-sunk);
}
figcaption { margin-top: .6rem; font-size: .875rem; color: var(--ink-faint); }

/* ---------- tables ---------- */

.table-scroll { overflow-x: auto; margin: 1.25rem 0; }
table { border-collapse: collapse; width: 100%; min-width: 32rem; font-size: .95rem; }
caption { caption-side: bottom; padding-top: .75rem; font-size: .875rem; color: var(--ink-faint); text-align: left; }
th, td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { color: var(--brand); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; }
tbody th { font-weight: 600; white-space: nowrap; }
tbody tr:hover { background: var(--bg-raise); }

/* ---------- download ---------- */

.release-line { font-size: 1.1rem; color: var(--ink-dim); }
.release-line strong { color: var(--brand); }
#download .cta { justify-content: flex-start; margin-bottom: 1rem; }
.reqs { margin: 1rem 0 0; padding-left: 1.15rem; color: var(--ink-dim); max-width: 62ch; }
.reqs li { margin-bottom: .4rem; }
.reqs strong { color: var(--ink); }

.closing .cta { justify-content: flex-start; }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-sunk);
  padding: 2.5rem 0;
  color: var(--ink-dim); font-size: .95rem;
}
.site-footer p { max-width: 62ch; }
.site-footer p:last-child { margin-bottom: 0; }