/* =========================================================================
   agentbrainsystem — landing
   Aesthetic: bioluminescent organism (organic + futuristic).
   Tokens mirror docs/DESIGN.md. Glow = signature elevation (intentional).
   ========================================================================= */

/* ---- Fonts (self-hosted, offline-first — no CDN) ---- */
@font-face {
  font-family: "Space Grotesk";
  src: url("assets/fonts/SpaceGrotesk.ttf") format("truetype");
  font-weight: 300 700; font-display: swap; font-style: normal;
}
@font-face {
  font-family: "Inter";
  src: url("assets/fonts/Inter.ttf") format("truetype");
  font-weight: 100 900; font-display: swap; font-style: normal;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/JetBrainsMono.ttf") format("truetype");
  font-weight: 400 700; font-display: swap; font-style: normal;
}

/* ---- Design tokens ---- */
:root {
  /* brand / accents (DESIGN.md §4) */
  --violet-300:#C4B5FD; --violet-400:#A78BFA; --violet-500:#8B5CF6;
  --violet-600:#7C3AED; --violet-700:#6D28D9;
  --cyan:#22D3EE; --lavender:#A78BFA; --teal:#5EEAD4;
  --amber:#FBBF24; --fuchsia:#F0ABFC;

  /* neutrals — deep violet-tinted (DESIGN.md §4), not pure gray */
  --n-50:#FAFAF9; --n-100:#F3F2F7; --n-200:#E6E4ED; --n-300:#CFCBDB;
  --n-400:#9A95AD; --n-500:#6E6A82; --n-600:#4A4760; --n-700:#2A2838;
  --n-800:#1A1825; --n-900:#12101B; --n-950:#0A0810;

  /* semantic */
  --bg:var(--n-950); --surface:var(--n-800); --surface-2:var(--n-900);
  --text:var(--n-50); --text-muted:var(--n-300); --text-dim:var(--n-400);
  --border:rgba(255,255,255,0.08);
  --accent:var(--violet-500);

  /* type scale (ratio 1.25, fluid) */
  --text-xs:0.75rem; --text-sm:0.875rem; --text-base:1rem;
  --text-lg:clamp(1.05rem,1rem + .4vw,1.18rem);
  --text-xl:clamp(1.2rem,1.05rem + .8vw,1.5rem);
  --text-2xl:clamp(1.5rem,1.2rem + 1.4vw,2rem);
  --text-3xl:clamp(1.7rem,1.3rem + 1.9vw,2.4rem);
  --text-hero:clamp(2rem,1.4rem + 2.5vw,3.3rem);

  /* spacing (4px grid) */
  --s-1:.25rem; --s-2:.5rem; --s-3:.75rem; --s-4:1rem; --s-6:1.5rem;
  --s-8:2rem; --s-10:2.5rem; --s-12:3rem; --s-16:4rem; --s-20:5rem; --s-24:6rem;

  /* radius (DESIGN.md §8) */
  --r-sm:6px; --r:10px; --r-lg:16px; --r-full:9999px;

  /* glow as elevation (DESIGN.md §8) */
  --glow-sm:0 0 12px -2px rgba(139,92,246,.35);
  --glow-md:0 0 24px -2px rgba(139,92,246,.45);
  --glow-lg:0 0 56px -6px rgba(139,92,246,.5);

  /* motion (DESIGN.md §9) */
  --ease:cubic-bezier(.16,1,.3,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --dur-micro:140ms; --dur:250ms; --dur-page:400ms;

  --maxw:1280px;
  color-scheme: dark;
}

/* ---- Reset ---- */
*,*::before,*::after { box-sizing:border-box; margin:0; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:84px; }
body {
  background:var(--bg); color:var(--text);
  font-family:"Inter",system-ui,sans-serif;
  font-size:var(--text-base); line-height:1.6;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img { display:block; max-width:100%; }
a { color:inherit; text-decoration:none; }
:focus-visible { outline:2px solid var(--violet-500); outline-offset:3px; border-radius:var(--r-sm); }
::selection { background:rgba(139,92,246,.35); }

.skip-link {
  position:absolute; left:-999px; top:var(--s-2);
  background:var(--surface); color:var(--text); padding:var(--s-2) var(--s-4);
  border-radius:var(--r); z-index:100;
}
.skip-link:focus { left:var(--s-4); }

/* ---- Layout helpers ---- */
.wrap { width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--s-6); }
.eyebrow {
  font-family:"JetBrains Mono",monospace; font-size:var(--text-xs);
  letter-spacing:.18em; text-transform:uppercase; color:var(--violet-400);
}
h1,h2,h3 { font-family:"Space Grotesk",sans-serif; font-weight:700; line-height:1.05;
  letter-spacing:-.02em; text-wrap:balance; }
.lead { color:var(--text-muted); font-size:var(--text-lg); max-width:60ch; text-wrap:pretty; }
.mono { font-family:"JetBrains Mono",monospace; }
[translate="no"] { font-family:"Space Grotesk",sans-serif; }

/* =========================================================================
   Header / nav
   ========================================================================= */
.nav {
  position:sticky; top:0; z-index:50;
  backdrop-filter:blur(12px); background:rgba(10,8,16,.72);
  border-bottom:1px solid var(--border);
}
.nav__inner { display:flex; align-items:center; gap:var(--s-4);
  height:64px; }
.brand { display:flex; align-items:center; gap:var(--s-3); margin-right:auto; font-weight:700; }
.brand img { width:30px; height:30px; filter:drop-shadow(0 0 8px rgba(139,92,246,.6)); }
.brand b { font-family:"Space Grotesk",sans-serif; font-size:1.05rem; letter-spacing:-.02em; }
.nav__links { display:flex; gap:var(--s-6); font-size:var(--text-sm); color:var(--text-muted); }
.nav__links a { transition:color var(--dur-micro) var(--ease); }
.nav__links a:hover { color:var(--text); }

/* language toggle */
.langtoggle { display:inline-flex; border:1px solid var(--border); border-radius:var(--r-full);
  overflow:hidden; font-family:"JetBrains Mono",monospace; font-size:var(--text-xs); }
.langtoggle button {
  appearance:none; background:transparent; color:var(--text-dim); border:0;
  padding:var(--s-1) var(--s-3); cursor:pointer; letter-spacing:.05em;
  transition:color var(--dur-micro) var(--ease), background var(--dur-micro) var(--ease);
}
.langtoggle button[aria-pressed="true"] { color:var(--n-950); background:var(--violet-400); }
.langtoggle button:hover:not([aria-pressed="true"]) { color:var(--text); }

/* buttons */
.btn {
  display:inline-flex; align-items:center; gap:var(--s-2);
  font-family:"Space Grotesk",sans-serif; font-weight:500; font-size:var(--text-sm);
  padding:var(--s-3) var(--s-6); border-radius:var(--r-full); cursor:pointer;
  border:1px solid transparent; white-space:nowrap;
  transition:transform var(--dur-micro) var(--ease), box-shadow var(--dur) var(--ease),
             background var(--dur-micro) var(--ease), border-color var(--dur-micro) var(--ease);
}
.btn-primary { background:var(--violet-500); color:#fff; box-shadow:var(--glow-sm); }
.btn-primary:hover { background:var(--violet-400); box-shadow:var(--glow-md); }
.btn-primary:active { transform:translateY(1px) scale(.99); }
.btn-ghost { background:transparent; color:var(--text); border-color:var(--border); }
.btn-ghost:hover { border-color:var(--violet-500); background:rgba(139,92,246,.08); }
.btn-ghost:active { transform:translateY(1px); }
.btn[aria-disabled="true"] { opacity:.5; pointer-events:none; }
.btn .star { color:var(--amber); }
.nav .btn { padding:var(--s-2) var(--s-4); }

/* =========================================================================
   Hero
   ========================================================================= */
.hero { position:relative; min-height:calc(100svh - 65px); display:flex; align-items:center;
  padding-block:var(--s-10); }
.hero__grid { display:grid; grid-template-columns:1.05fr .95fr; gap:var(--s-12); align-items:center; }
.hero__copy { display:flex; flex-direction:column; gap:var(--s-6); }
.hero h1 { font-size:var(--text-hero); }
.hero h1 .hl { color:var(--violet-400); }
.hero__cta { display:flex; gap:var(--s-3); flex-wrap:wrap; align-items:center; }
.hero__note { font-size:var(--text-sm); color:var(--text-dim); display:flex; align-items:center; gap:var(--s-2); }

/* creature visual */
.creature { position:relative; display:grid; place-items:center; min-height:420px; }
.creature::before { /* radial glow behind */
  content:""; position:absolute; inset:0; margin:auto; width:78%; aspect-ratio:1;
  background:radial-gradient(circle, rgba(124,58,237,.45), rgba(124,58,237,0) 65%);
  filter:blur(10px); z-index:0;
}
.creature img {
  position:relative; z-index:1; width:min(100%,460px); aspect-ratio:1;
  mix-blend-mode:screen; /* black bg vanishes, only glow shows */
  animation:breathe 7s var(--ease) infinite alternate;
}
@keyframes breathe {
  from { transform:translateY(-6px) scale(.99); }
  to   { transform:translateY(8px) scale(1.01); }
}

/* =========================================================================
   Sections
   ========================================================================= */
section { padding-block:var(--s-16); }
.section-head { max-width:62ch; margin-bottom:var(--s-10); display:grid; gap:var(--s-4); }
.section-head .lead { color:var(--text-muted); }
.section-head h2 { font-size:var(--text-3xl); }
.section-head p { color:var(--text-muted); font-size:var(--text-lg); }

/* hero features (3) */
.features-3 { display:grid; grid-template-columns:repeat(3,1fr); gap:var(--s-6); }
.feat {
  position:relative; padding:var(--s-8); border-radius:var(--r-lg);
  background:var(--surface); border:1px solid var(--border);
  display:grid; gap:var(--s-3); align-content:start;
  transition:transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.feat:hover { transform:translateY(-4px); border-color:rgba(139,92,246,.4); box-shadow:var(--glow-sm); }
.feat .ic { width:40px; height:40px; display:grid; place-items:center; border-radius:var(--r);
  background:rgba(139,92,246,.12); color:var(--violet-300); }
.feat h3 { font-size:var(--text-xl); }
.feat p { color:var(--text-muted); font-size:var(--text-base); }
.feat .stat { font-family:"JetBrains Mono",monospace; font-size:var(--text-xs);
  color:var(--teal); letter-spacing:.04em; }

/* how it works — 3 numbered steps (distinct from feature cards) */
.steps { display:grid; grid-template-columns:repeat(3,1fr); gap:var(--s-8); list-style:none; }
.step { display:grid; gap:var(--s-2); padding-top:var(--s-4); border-top:2px solid var(--violet-700); }
.step__n { font-family:"JetBrains Mono",monospace; font-size:var(--text-2xl); font-weight:500;
  color:var(--violet-400); line-height:1; }
.step h3 { font-size:var(--text-lg); margin-top:var(--s-1); }
.step p { color:var(--text-muted); font-size:var(--text-sm); }
.step .tech { font-family:"JetBrains Mono",monospace; font-size:var(--text-xs); color:var(--teal); letter-spacing:.03em; }

/* "more" panel — spec-sheet grid with hairline dividers */
.more-panel { display:grid; grid-template-columns:repeat(3,1fr); gap:1px;
  background:var(--border); border:1px solid var(--border); border-radius:var(--r-lg); overflow:hidden; }
.more-item { background:var(--surface); padding:var(--s-6); display:flex; align-items:center; gap:var(--s-3);
  font-family:"JetBrains Mono",monospace; font-size:var(--text-sm); color:var(--text-muted);
  transition:background var(--dur) var(--ease), color var(--dur) var(--ease); }
.more-item:hover { background:var(--n-700); color:var(--text); }
.more-item .dot { width:9px; height:9px; border-radius:50%; flex:none;
  background:var(--violet-500); box-shadow:0 0 9px var(--violet-500); }
.more-item:nth-child(2) .dot{ background:var(--cyan); box-shadow:0 0 9px var(--cyan);}
.more-item:nth-child(3) .dot{ background:var(--amber); box-shadow:0 0 9px var(--amber);}
.more-item:nth-child(4) .dot{ background:var(--teal); box-shadow:0 0 9px var(--teal);}
.more-item:nth-child(5) .dot{ background:var(--fuchsia); box-shadow:0 0 9px var(--fuchsia);}
.more-item:nth-child(6) .dot{ background:var(--lavender); box-shadow:0 0 9px var(--lavender);}

/* graph UI section — framed like a product window */
.graph-sec { display:grid; grid-template-columns:1fr 1.15fr; gap:var(--s-12); align-items:center; }
.graph-window { border:1px solid var(--border); border-radius:var(--r-lg); overflow:hidden;
  background:var(--surface-2); box-shadow:var(--glow-sm), 0 30px 80px -45px #000; }
.gw-bar { display:flex; align-items:center; gap:var(--s-2); padding:var(--s-3) var(--s-4);
  border-bottom:1px solid var(--border); background:var(--surface); }
.gw-bar i { width:11px; height:11px; border-radius:50%; background:var(--n-600); display:block; }
.gw-bar i:nth-child(1){ background:#ff5f56cc; } .gw-bar i:nth-child(2){ background:#ffbd2ecc; }
.gw-bar i:nth-child(3){ background:#27c93fcc; }
.gw-bar span { margin-left:auto; font-family:"JetBrains Mono",monospace; font-size:var(--text-xs);
  color:var(--text-dim); letter-spacing:.04em; }
.gw-canvas { aspect-ratio:1.5; background:radial-gradient(circle at 58% 46%, rgba(124,58,237,.18), transparent 62%), var(--n-950); }
.gw-canvas svg { width:100%; height:100%; display:block; }
.gnode { transform-box:fill-box; transform-origin:center; animation:pulse 3s var(--ease) infinite; }
.gnode:nth-child(7n+2){ animation-delay:.4s } .gnode:nth-child(7n+3){ animation-delay:.9s }
.gnode:nth-child(7n+4){ animation-delay:1.4s } .gnode:nth-child(7n+5){ animation-delay:.7s }
.gnode:nth-child(7n+6){ animation-delay:1.9s } .gnode:nth-child(7n+7){ animation-delay:1.1s }
@keyframes pulse { 0%,100%{ opacity:.9; transform:scale(1) } 50%{ opacity:1; transform:scale(1.1) } }
.gedge { stroke:rgba(196,181,253,.28); stroke-width:1.4; }

/* FAQ */
.faq { display:grid; gap:var(--s-3); max-width:760px; }
.faq details { border:1px solid var(--border); border-radius:var(--r);
  background:var(--surface); overflow:hidden; transition:border-color var(--dur) var(--ease); }
.faq details[open] { border-color:rgba(139,92,246,.35); }
.faq summary { cursor:pointer; padding:var(--s-4) var(--s-6); font-family:"Space Grotesk",sans-serif;
  font-weight:500; font-size:var(--text-lg); list-style:none; display:flex; align-items:center; gap:var(--s-4); }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; margin-left:auto; color:var(--violet-400); font-size:1.4em;
  transition:transform var(--dur) var(--ease); }
.faq details[open] summary::after { transform:rotate(45deg); }
.faq summary:hover { color:var(--violet-300); }
.faq .ans { padding:0 var(--s-6) var(--s-6); color:var(--text-muted); }
.faq .ans code { font-family:"JetBrains Mono",monospace; font-size:.85em;
  background:var(--n-900); padding:1px 6px; border-radius:var(--r-sm); color:var(--violet-300); }

/* final CTA */
.final { text-align:center; }
.final h2 { font-size:var(--text-3xl); margin-bottom:var(--s-6); }
.final .cta { display:flex; gap:var(--s-3); justify-content:center; flex-wrap:wrap; }
.final .tags { margin-top:var(--s-6); font-family:"JetBrains Mono",monospace;
  font-size:var(--text-xs); color:var(--text-dim); letter-spacing:.08em; }

/* footer */
.footer { border-top:1px solid var(--border); padding-block:var(--s-10); color:var(--text-dim);
  font-size:var(--text-sm); }
.footer__inner { display:flex; gap:var(--s-6); align-items:center; flex-wrap:wrap; }
.footer a { color:var(--text-muted); transition:color var(--dur-micro) var(--ease); }
.footer a:hover { color:var(--violet-300); }
.footer .right { margin-left:auto; }

/* =========================================================================
   Reveal on scroll
   ========================================================================= */
.reveal { opacity:0; transform:translateY(20px); transition:opacity var(--dur-page) var(--ease),
  transform var(--dur-page) var(--ease); }
.reveal.in { opacity:1; transform:none; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width:920px) {
  .hero__grid { grid-template-columns:1fr; gap:var(--s-10); }
  .creature { order:-1; min-height:320px; }
  .creature img { width:min(72%,360px); }
  .features-3 { grid-template-columns:1fr; }
  .steps { grid-template-columns:1fr; gap:var(--s-6); }
  .more-panel { grid-template-columns:repeat(2,1fr); }
  .graph-sec { grid-template-columns:1fr; }
  .graph-window { order:-1; }
  .nav__links { display:none; }
}
@media (max-width:520px) {
  .hero { min-height:0; padding-block:var(--s-12) var(--s-10); }
  section { padding-block:var(--s-16); }
  .hero__cta .btn { flex:1 1 auto; justify-content:center; }
  .more-panel { grid-template-columns:1fr; }
}

/* touch targets */
@media (pointer:coarse) {
  .btn,.langtoggle button,.faq summary { min-height:44px; }
}

/* =========================================================================
   Reduced motion — kill ambient life, keep essential transitions short
   ========================================================================= */
@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after { animation:none !important; }
  .reveal { opacity:1; transform:none; transition:none; }
  html { scroll-behavior:auto; }
  .creature img { animation:none; }
}