/* secryst.github.io — technical primer & documentation
   Light instrument-panel theme; one spectral accent (the prism).
   Fonts: Space Grotesk (display) · IBM Plex Sans (body) · IBM Plex Mono (code) */

:root {
  --paper: #fafbfc;
  --panel: #ffffff;
  --ink: #101828;
  --slate: #475467;
  --faint: #98a2b3;
  --line: #e4e7ec;
  --code-bg: #0e1526;
  --code-ink: #d5dce8;
  --violet: #5a4fe0;
  --cyan: #00b8d9;
  --spectral: linear-gradient(100deg, #5a4fe0 0%, #7a5cf0 35%, #00b8d9 100%);
  --display: "Space Grotesk", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--violet); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--violet); outline-offset: 2px; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 251, 252, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 2.25rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand-gem {
  width: 18px; height: 18px;
  background: var(--spectral);
  clip-path: polygon(50% 0, 100% 38%, 50% 100%, 0 38%);
}
.nav {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
  font-size: .9rem;
  font-weight: 500;
}
.nav a { color: var(--slate); padding: .3rem 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--ink); text-decoration: none; }
body[data-page="index"]    .nav a[href="/"], 
body[data-page="primer"]   .nav a[href="primer.html"],
body[data-page="spec"]     .nav a[href="spec.html"],
body[data-page="crystals"] .nav a[href="crystals.html"],
body[data-page="models"]   .nav a[href="models.html"] {
  color: var(--ink);
  border-bottom-color: var(--violet);
}
@media (max-width: 720px) {
  .nav { gap: .9rem; font-size: .82rem; }
  .topbar-inner { gap: 1rem; }
}

/* ---------- layout scaffolding ---------- */

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.docs-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 3rem;
  padding: 2.5rem 1.5rem 5rem;
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
}
.toc {
  position: sticky;
  top: 84px;
  align-self: start;
  font-size: .82rem;
}
.toc-heading {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 .75rem;
}
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: .3rem 0; }
.toc a { color: var(--slate); display: block; padding: .15rem 0 .15rem .8rem; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--ink); text-decoration: none; border-left-color: var(--faint); }

.page { max-width: 76ch; }
.page h1 {
  font-family: var(--display);
  font-size: 2.1rem;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 .6rem;
}
.page h2 {
  font-family: var(--display);
  font-size: 1.35rem;
  margin: 2.6rem 0 .7rem;
  letter-spacing: -0.01em;
}
.page h3 { font-family: var(--display); font-size: 1.05rem; margin: 1.8rem 0 .5rem; }
.page p { color: var(--ink); margin: .8rem 0; }
.page p, .page li { max-width: 70ch; }
.page-eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--violet);
  margin: 0 0 .5rem;
}

/* spec sections: ordered like a standard */
.sec { border-top: 1px solid var(--line); margin-top: 2.5rem; padding-top: 1.5rem; }
.sec-num {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--faint);
}
.sec > h2 { margin-top: .2rem; }

/* RFC-2119 keywords */
.rfc { font-family: var(--mono); font-weight: 600; font-size: .82em; letter-spacing: .06em; color: var(--violet); }

/* ---------- code ---------- */

code {
  font-family: var(--mono);
  font-size: .86em;
  background: #eef0f4;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: .08em .38em;
  color: #1d2939;
}
pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: .84rem;
  line-height: 1.6;
  margin: 1rem 0;
}
pre code { background: none; border: 0; padding: 0; color: inherit; font-size: 1em; }
.code-label {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 1.1rem 0 -0.6rem;
}

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

table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: .9rem; }
th {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate);
  text-align: left;
  padding: .55rem .75rem;
  border-bottom: 2px solid var(--line);
}
td { padding: .55rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

/* ---------- badges ---------- */

.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .18rem .5rem;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--slate);
  background: var(--panel);
  vertical-align: middle;
}
.badge-v1 {
  background: var(--spectral);
  color: #fff;
  border: 0;
}
.badge-ok { color: #067647; border-color: #abefc6; background: #ecfdf3; }
.badge-review { color: #b54708; border-color: #fead0a66; background: #fffaeb; }
.badge-hold { color: #475467; border-color: var(--line); }

/* ---------- hero (landing) ---------- */

.hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 380px at 85% -10%, rgba(90, 79, 224, .06), transparent 60%),
    var(--paper);
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 3rem;
  align-items: center;
}
@media (max-width: 900px) { .hero-inner { grid-template-columns: 1fr; padding: 3rem 1.5rem 3rem; } }
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.3rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: .8rem 0 1rem;
}
.hero .page-eyebrow { margin-bottom: 0; }
.hero-lede { color: var(--slate); font-size: 1.08rem; max-width: 54ch; margin: 0 0 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.btn {
  font-family: var(--display);
  font-weight: 600;
  font-size: .95rem;
  padding: .65rem 1.3rem;
  border-radius: 8px;
  border: 1px solid var(--ink);
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #1d2939; text-decoration: none; }
.btn-ghost { color: var(--ink); border-color: var(--line); background: var(--panel); }
.btn-ghost:hover { border-color: var(--ink); text-decoration: none; }

/* ---------- the prism (signature) ---------- */

.prism-stage { position: relative; padding: 2rem 0 2.4rem; }
.prism-svg { width: 100%; height: auto; display: block; }
.beam-in, .beam-out { stroke-dasharray: 600; stroke-dashoffset: 600; animation: draw 1.6s .3s ease-out forwards; }
.beam-out { animation-delay: 1s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.disperse { opacity: 0; animation: appear .9s 1.9s ease-out forwards; }
@keyframes appear { to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .beam-in, .beam-out { stroke-dashoffset: 0; animation: none; }
  .disperse { opacity: 1; animation: none; }
}

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

.band { border-bottom: 1px solid var(--line); }
.band-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}
.band h2 {
  font-family: var(--display);
  font-size: 1.5rem;
  margin: 0 0 .4rem;
  letter-spacing: -0.01em;
}
.band .band-sub { color: var(--slate); margin: 0 0 1.8rem; max-width: 70ch; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: 1.1rem;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.4rem 1.4rem 1.2rem;
}
.card h3 { font-family: var(--display); margin: 0 0 .5rem; font-size: 1.02rem; }
.card p { color: var(--slate); font-size: .92rem; margin: 0 0 .8rem; }
.card .mono-chip { font-family: var(--mono); font-size: .72rem; color: var(--violet); }

.reveal-io {
  display: grid;
  gap: .15rem;
  margin: .4rem 0 .6rem;
}
.reveal-io .src {
  font-family: var(--display);
  font-size: 1.55rem;
  color: var(--faint);
}
.reveal-io .dst {
  font-family: var(--display);
  font-size: 1.7rem;
  background: var(--spectral);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.reveal-io .gloss { font-size: .78rem; color: var(--faint); font-style: italic; }

.contract-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--panel);
}
@media (max-width: 820px) { .contract-card { grid-template-columns: 1fr; } }
.contract-half { padding: 1.5rem 1.6rem; }
.contract-half + .contract-half { border-left: 1px solid var(--line); }
@media (max-width: 820px) { .contract-half + .contract-half { border-left: 0; border-top: 1px solid var(--line); } }
.contract-half h3 { font-family: var(--mono); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; margin: 0 0 .6rem; color: var(--slate); }

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

footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 1.5rem 3rem;
  font-size: .85rem;
  color: var(--slate);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
}