/* Synapse web portal — design system.
   No external fonts, no CDN, no build step: the whole site works from file:// , from any static
   host, and inside an air-gapped review. Colour is defined once as tokens on :root so light and
   dark stay in step, and every dark override lives in one block. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-raised: #ffffff;
  --border: #e3e6ea;
  --border-strong: #cdd3da;
  --text: #14181d;
  --text-soft: #566270;
  --text-faint: #7b8794;
  --accent: #1f4fd8;
  --accent-soft: #eaf0ff;
  --accent-text: #ffffff;
  --good: #0f7a4f;
  --good-soft: #e6f5ee;
  --warn: #8a5a00;
  --warn-soft: #fdf3e0;
  --shadow: 0 1px 2px rgba(20, 24, 29, .06), 0 8px 24px rgba(20, 24, 29, .06);
  --radius: 12px;
  --maxw: 1120px;
  --step: clamp(1rem, .6rem + 1.2vw, 1.125rem);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --bg-soft: #141922;
    --bg-raised: #171d26;
    --border: #252d39;
    --border-strong: #333d4b;
    --text: #e8edf3;
    --text-soft: #a3aebc;
    --text-faint: #7d8794;
    --accent: #6f9bff;
    --accent-soft: #16233d;
    --accent-text: #0b1220;
    --good: #4bd193;
    --good-soft: #102a20;
    --warn: #e5b567;
    --warn-soft: #2a2113;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #0e1116; --bg-soft: #141922; --bg-raised: #171d26;
  --border: #252d39; --border-strong: #333d4b;
  --text: #e8edf3; --text-soft: #a3aebc; --text-faint: #7d8794;
  --accent: #6f9bff; --accent-soft: #16233d; --accent-text: #0b1220;
  --good: #4bd193; --good-soft: #102a20; --warn: #e5b567; --warn-soft: #2a2113;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: var(--step)/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.1rem, 1.3rem + 3.2vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.1rem); margin-top: 0; }
h3 { font-size: 1.125rem; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(1.05rem, .95rem + .6vw, 1.3rem); color: var(--text-soft); }
.muted { color: var(--text-soft); }
.small { font-size: .875rem; }

/* skip link */
.skip {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: var(--accent-text);
  padding: 10px 16px; z-index: 100; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* header */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; letter-spacing: -.02em; color: var(--text); text-decoration: none; }
.brand svg { display: block; }
.nav ul { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; margin-left: auto; align-items: center; }
.nav a.navlink { color: var(--text-soft); text-decoration: none; font-size: .95rem; }
.nav a.navlink:hover, .nav a.navlink[aria-current="page"] { color: var(--text); }
.nav .navtoggle { display: none; } /* .btn sets display later at equal specificity — scope to .nav to outrank it */

@media (max-width: 800px) {
  .nav ul { display: none; }
  .nav ul.open {
    display: flex; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column;
    align-items: flex-start; gap: 4px; background: var(--bg-raised); border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
  }
  .nav .navtoggle { display: inline-flex; margin-left: auto; }
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 11px 18px; border-radius: 10px; border: 1px solid transparent;
  font-weight: 600; font-size: .95rem; cursor: pointer; text-decoration: none;
  background: var(--accent); color: var(--accent-text); transition: transform .06s ease, filter .15s ease;
}
.btn:hover { filter: brightness(1.06); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn.ghost:hover { background: var(--bg-soft); }
.btn.sm { padding: 7px 12px; font-size: .875rem; border-radius: 8px; }

/* sections */
section { padding: 72px 0; }
section.tight { padding: 48px 0; }
.section-head { max-width: 720px; margin-bottom: 36px; }
.eyebrow {
  display: inline-block; font-size: .75rem; letter-spacing: .09em; text-transform: uppercase;
  font-weight: 700; color: var(--accent); margin-bottom: 10px;
}
.alt { background: var(--bg-soft); border-block: 1px solid var(--border); }

/* hero */
.hero { padding: 84px 0 64px; }
.hero .lead { max-width: 640px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-note { margin-top: 20px; font-size: .9rem; color: var(--text-faint); }

/* grids + cards */
.grid { display: grid; gap: 18px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.card {
  background: var(--bg-raised); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.card h3 { margin-bottom: .35em; }
.card p:last-child { margin-bottom: 0; }
.card .replaces { font-size: .82rem; color: var(--text-faint); margin-top: 10px; }

/* stat */
.stat { text-align: left; }
.stat .n { font-size: clamp(1.7rem, 1.2rem + 1.8vw, 2.4rem); font-weight: 700; letter-spacing: -.03em; }
.stat .l { color: var(--text-soft); font-size: .9rem; }

/* pills + tags */
.pill {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: .78rem; font-weight: 600;
  background: var(--accent-soft); color: var(--accent); border: 1px solid transparent;
}
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.plain { background: var(--bg-soft); color: var(--text-soft); }

/* callout */
.callout {
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  background: var(--bg-soft); border-radius: 8px; padding: 16px 18px;
}
.callout.warn { border-left-color: var(--warn); }
.callout h3 { margin-bottom: .3em; }
.callout p:last-child { margin-bottom: 0; }

/* table */
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint); font-weight: 700; }
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-raised); }

/* pricing */
.tier { display: flex; flex-direction: column; }
.tier.featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow); }
.tier .price { font-size: 2rem; font-weight: 700; letter-spacing: -.03em; margin: 6px 0 2px; }
.tier .per { color: var(--text-faint); font-size: .85rem; }
.tier ul { list-style: none; padding: 0; margin: 16px 0 22px; display: grid; gap: 9px; font-size: .93rem; }
.tier li { padding-left: 24px; position: relative; color: var(--text-soft); }
.tier li::before {
  content: ""; position: absolute; left: 4px; top: .55em; width: 9px; height: 5px;
  border-left: 2px solid var(--good); border-bottom: 2px solid var(--good); transform: rotate(-45deg);
}
.tier .btn { margin-top: auto; }

/* steps */
ol.steps { counter-reset: s; list-style: none; padding: 0; display: grid; gap: 18px; }
ol.steps li { counter-increment: s; padding-left: 52px; position: relative; }
ol.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); font-weight: 700; font-size: .95rem;
}
ol.steps h3 { margin-bottom: .2em; }

/* calculator */
.calc { display: grid; grid-template-columns: minmax(320px, 1fr) minmax(300px, .85fr); gap: 26px; align-items: start; }
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
.field .hint { display: block; font-weight: 400; color: var(--text-faint); font-size: .82rem; margin-top: 2px; }
input[type="number"], input[type="text"], select {
  width: 100%; padding: 10px 12px; font: inherit; font-size: .95rem;
  color: var(--text); background: var(--bg); border: 1px solid var(--border-strong); border-radius: 9px;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.tool-row { display: grid; grid-template-columns: 1fr 130px 40px; gap: 8px; align-items: center; margin-bottom: 8px; }
.tool-row input { margin: 0; }
.iconbtn {
  border: 1px solid var(--border-strong); background: var(--bg); color: var(--text-soft);
  border-radius: 8px; height: 38px; cursor: pointer; font-size: 1.1rem; line-height: 1;
}
.iconbtn:hover { background: var(--bg-soft); color: var(--text); }
.result { position: sticky; top: 88px; }
.result .big { font-size: clamp(1.9rem, 1.4rem + 2vw, 2.6rem); font-weight: 700; letter-spacing: -.03em; color: var(--good); }
.result dl { display: grid; grid-template-columns: 1fr auto; gap: 10px 16px; margin: 18px 0 0; font-size: .93rem; }
.result dt { color: var(--text-soft); }
.result dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.result .divider { grid-column: 1 / -1; border-top: 1px solid var(--border); margin: 4px 0; }

/* bar viz */
.bars { display: grid; gap: 10px; margin-top: 18px; }
.bar-row { display: grid; grid-template-columns: 130px 1fr auto; gap: 12px; align-items: center; font-size: .87rem; }
.bar { height: 10px; border-radius: 999px; background: var(--bg-soft); overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: 999px; }

/* footer */
footer.site { border-top: 1px solid var(--border); padding: 44px 0 60px; color: var(--text-soft); font-size: .92rem; }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 28px; }
@media (max-width: 800px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
footer.site h4 { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); margin: 0 0 12px; }
footer.site ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
footer.site a { color: var(--text-soft); text-decoration: none; }
footer.site a:hover { color: var(--text); text-decoration: underline; }
.legal { margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--border); font-size: .84rem; color: var(--text-faint); }

/* status banner */
.status-bar {
  background: var(--warn-soft); border-bottom: 1px solid var(--border);
  font-size: .88rem; padding: 9px 0; color: var(--text);
}
.status-bar strong { font-weight: 700; }

@media print {
  header.site, .status-bar, footer.site, .hero-cta { display: none; }
  body { color: #000; background: #fff; }
}

/* ---- spacing utilities ---------------------------------------------------
   These exist so no element needs a style="" attribute. That is not tidiness for
   its own sake: it lets the Content-Security-Policy drop 'unsafe-inline' from
   style-src, which on a security vendor's own site is the difference between
   practising and preaching. */
.mt-sm { margin-top: 10px; }
.mt-md { margin-top: 18px; }
.mt-lg { margin-top: 20px; }
.mt-xl { margin-top: 24px; }
.mt-2xl { margin-top: 26px; }
.mt-3xl { margin-top: 34px; }
.mb-sm { margin-bottom: 10px; }
.my-lg { margin: 22px 0; }
.my-xl { margin: 26px 0; }
.tight-note { margin: 2px 0 0; }
.hero-short { padding-bottom: 36px; }
.hero-shorter { padding-bottom: 40px; }
.measure { max-width: 720px; }
.subhead { font-size: 1.25rem; }
.stack-sm { margin-top: 20px; gap: 14px; }