/* Optival — dark-terminal design system.
   Ported and generalized from prototypes/a-dark-terminal.html. */

:root {
  --bg: #06080a;
  --panel: #0c1116;
  --panel-2: #0f161d;
  --line: #1b2530;
  --text: #cdd8d1;
  --muted: #66776e;
  --green: #4ade80;
  --cyan: #2dd4bf;
  --amber: #fbbf24;
  --red: #ff5f56;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --display: "Syne", var(--mono);
  --maxw: 1100px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Grid backdrop, fading toward the top. */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .22;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
          mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 80%);
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; position: relative; z-index: 1; }
a { color: inherit; }

/* ---- nav ---- */
/* Lift the nav's wrapper above the hero wrapper so the open mobile menu (a child
   stacking context) paints above hero content instead of behind it. */
.nav-wrap { z-index: 50; }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 26px 0; }
.brand { font-family: var(--display); font-weight: 800; letter-spacing: .08em; font-size: 1.15rem; text-decoration: none; }
.brand b { color: var(--green); }
.nav-links { display: flex; gap: 26px; font-size: .8rem; color: var(--muted); }
.nav-links a { color: var(--muted); text-decoration: none; transition: color .2s; }
.nav-links a:hover { color: var(--green); }
.tag-pill { border: 1px solid var(--line); border-radius: 2px; padding: 5px 11px; font-size: .7rem; color: var(--cyan); white-space: nowrap; }

/* hamburger — hidden on desktop, shown on mobile */
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 3px; width: 42px; height: 38px; cursor: pointer; padding: 0; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--text); transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- hero ---- */
.hero { padding: 86px 0 60px; }
.kicker { font-size: .72rem; letter-spacing: .35em; text-transform: uppercase; color: var(--green); display: flex; align-items: center; gap: 10px; }
.kicker::before { content: ""; width: 34px; height: 1px; background: var(--green); }
.hero h1 {
  font-family: var(--display); font-weight: 800; font-size: clamp(3rem, 9vw, 7rem);
  line-height: .92; letter-spacing: -.02em; margin: 22px 0 18px; color: #f3f8f5;
}
.hero h1 .accent { color: var(--green); }
.lede { max-width: 640px; color: var(--muted); font-size: 1.02rem; }
.lede b, .lede strong { color: var(--text); font-weight: 500; }
.cta-row { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn { font-family: var(--mono); font-size: .82rem; padding: 13px 22px; border-radius: 2px; text-decoration: none; border: 1px solid var(--line); transition: all .2s; display: inline-block; }
.btn-primary { background: var(--green); color: #04110a; border-color: var(--green); font-weight: 600; }
.btn-primary:hover { box-shadow: 0 0 28px -4px var(--green); }
.btn-ghost { color: var(--text); }
.btn-ghost:hover { border-color: var(--green); color: var(--green); }

/* ---- terminal panel ---- */
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; margin-top: 56px; overflow: hidden; }
.panel-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.panel-bar .title { margin-left: auto; color: var(--muted); font-size: .72rem; }
.panel-body { padding: 26px; font-size: .86rem; }
.ln { display: flex; gap: 14px; padding: 3px 0; flex-wrap: wrap; }
.ln .p { color: var(--green); }
.ln .c { color: var(--muted); }
.ln .v { color: var(--cyan); }
.blink { animation: blink 1.1s steps(2) infinite; }
@keyframes blink { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

/* ---- share-of-voice bar ---- */
.bar { height: 22px; background: #0a0f13; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; margin: 8px 0; position: relative; }
.bar i { position: absolute; inset: 0 auto 0 0; width: var(--w, 61%); background: linear-gradient(90deg, var(--green), var(--cyan)); }
.bar b { position: absolute; right: 8px; top: 0; line-height: 22px; font-size: .72rem; color: #04110a; font-weight: 600; }

/* ---- sections ---- */
section { padding: 78px 0; }
.sec-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 42px; flex-wrap: wrap; }
.sec-num { font-size: .72rem; color: var(--green); }
.sec-head h2 { font-family: var(--display); font-weight: 700; font-size: clamp(1.6rem, 4vw, 2.6rem); color: #eef4f0; letter-spacing: -.01em; }
.sec-head .aside { color: var(--muted); font-size: .85rem; margin-left: auto; max-width: 330px; text-align: right; }

.prose { max-width: 760px; }
.prose p { color: var(--muted); margin-bottom: 16px; }
.prose em { color: var(--text); font-style: normal; border-bottom: 1px dashed var(--line); }
.prose strong { color: var(--text); font-weight: 500; }

/* ---- engine grid ---- */
.engines { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.engine { background: var(--panel); padding: 28px 24px; transition: background .25s; }
.engine:hover { background: var(--panel-2); }
.engine .idx { font-size: .72rem; color: var(--green); }
.engine h3 { font-family: var(--display); font-weight: 700; font-size: 1.3rem; color: #eef4f0; margin: 14px 0 10px; }
.engine p { color: var(--muted); font-size: .82rem; }
.engine .io { margin-top: 18px; font-size: .72rem; color: var(--cyan); border-top: 1px dashed var(--line); padding-top: 12px; }

/* ---- generic card rows (research, roadmap, pipeline) ---- */
.rows { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.row { background: var(--panel); padding: 24px 26px; }
.row:hover { background: var(--panel-2); }
.row .top { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.row h3 { font-family: var(--display); font-weight: 700; font-size: 1.15rem; color: #eef4f0; }
.paper-link { color: #eef4f0; text-decoration: none; transition: color .2s; }
.paper-link:hover { color: var(--green); }
.paper-link .ext { color: var(--green); font-size: .8em; }
.row .meta { color: var(--cyan); font-size: .74rem; }
.row .meta.who { color: var(--muted); }
.row p { color: var(--muted); font-size: .85rem; margin-top: 10px; }
.badge { font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; border: 1px solid var(--line); border-radius: 2px; padding: 3px 8px; color: var(--muted); }
.badge.now { color: #04110a; background: var(--green); border-color: var(--green); }
.badge.next { color: var(--cyan); border-color: var(--cyan); }

/* ---- provider chips ---- */
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 4px; }
.chip { background: var(--panel); border: 1px solid var(--line); border-radius: 2px; padding: 8px 14px; font-size: .78rem; }
.chip .mode { color: var(--muted); font-size: .68rem; display: block; margin-top: 2px; }

/* ---- team ---- */
.team { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.member { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 24px; }
.member h3 { font-family: var(--display); font-weight: 700; font-size: 1.2rem; color: #eef4f0; }
.member .role { color: var(--green); font-size: .76rem; margin-top: 4px; }
.member p { color: var(--muted); font-size: .82rem; margin-top: 12px; }
.member .links { margin-top: 14px; display: flex; gap: 14px; font-size: .74rem; }
.member .links a { color: var(--cyan); text-decoration: none; }
.member .links a:hover { text-decoration: underline; }

/* ---- callout / placeholder ---- */
.callout { border: 1px dashed var(--line); border-radius: 6px; padding: 22px 24px; background: var(--panel); color: var(--muted); font-size: .85rem; }
.callout.warn { border-color: var(--amber); }
.callout .label { color: var(--amber); font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; display: block; margin-bottom: 8px; }

/* ---- 404 ---- */
.notfound { padding: 90px 0 80px; }
.notfound h1 { font-family: var(--display); font-weight: 800; font-size: clamp(4rem, 16vw, 9rem); line-height: .9; color: #f3f8f5; margin: 16px 0 14px; letter-spacing: -.03em; }

/* ---- page (docs/examples) ---- */
.page-head { padding: 60px 0 8px; }
.page-head h1 { font-family: var(--display); font-weight: 800; font-size: clamp(2.2rem, 6vw, 3.6rem); color: #f3f8f5; letter-spacing: -.02em; margin: 18px 0 14px; }
.page-head .intro { color: var(--muted); max-width: 680px; }
.content { padding: 30px 0 40px; max-width: 820px; }
.content h2 { font-family: var(--display); font-weight: 700; font-size: 1.6rem; color: #eef4f0; margin: 44px 0 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.content h2:first-child { border-top: none; padding-top: 0; margin-top: 8px; }
.content p { color: var(--muted); margin-bottom: 14px; }
.content ul { color: var(--muted); margin: 0 0 16px 1.1rem; }
.content li { margin-bottom: 7px; }
.content em { color: var(--text); font-style: normal; }
.content strong { color: var(--text); font-weight: 500; }
.content a { color: var(--cyan); }
.content code { background: var(--panel); border: 1px solid var(--line); border-radius: 3px; padding: 1px 6px; font-size: .85em; color: var(--cyan); }

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; color: var(--muted); font-size: .78rem; margin-top: 40px; }
.site-footer .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); text-decoration: none; transition: color .2s; }
.footer-links a:hover { color: var(--green); }

/* ---- reveal-on-load ---- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .7s ease, transform .7s ease; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } .blink { animation: none; } }

/* ---- responsive ---- */
@media (max-width: 760px) {
  .engines { grid-template-columns: 1fr; }
  .sec-head .aside { display: none; }

  /* mobile nav: hamburger reveals a dropdown panel */
  .nav { position: relative; }
  .nav-toggle { display: flex; }
  .nav .tag-pill { display: none; } /* status pill lives in the desktop bar only */

  .nav-links {
    flex-direction: column;
    gap: 0;
    align-items: stretch;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 8px;
    z-index: 30;
    box-shadow: 0 18px 40px -12px rgba(0, 0, 0, .7);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity .18s ease, transform .18s ease, visibility .18s;
  }
  .nav-links.open { visibility: visible; opacity: 1; transform: none; }
  .nav-links a { color: var(--text); padding: 13px 14px; border-radius: 4px; font-size: .95rem; }
  .nav-links a:hover { background: var(--panel-2); color: var(--green); }
}