:root{
  /* Nova coal — dark default */
  color-scheme:dark;
  --bg:#14120F;
  --bg-soft:#1A1814;
  --panel:#1C1A16;
  --panel-2:#241F1A;
  --surface:#17140F;
  --wireframe:#2A2520;
  --code-bg:#100E0B;
  --ink:#E5E1DA;
  --ink-dim:#9A9082;
  --rule:#2F2B26;
  --accent:#E17A57;
  --accent-2:oklch(0.72 0.14 145);
  --warn:oklch(0.75 0.14 100);
  --danger:oklch(0.65 0.20 25);
  --on-accent:#14120F;
  --header-bg:rgba(20,18,15,.85);
  --hover-tint:rgba(225,122,87,.06);
  --serif:"Source Serif 4","Source Serif Pro","Iowan Old Style","Georgia",serif;
  --sans:"Inter","Söhne","Helvetica Neue",system-ui,sans-serif;
  --mono:"JetBrains Mono","SF Mono",ui-monospace,monospace;
  --maxw:760px;
}
:root[data-theme="light"]{
  /* Nova bone — light theme */
  color-scheme:light;
  --bg:#E5E1DA;
  --bg-soft:#EFEBE3;
  --panel:#EFEBE3;
  --panel-2:#DCD8CE;
  --surface:#D9D4C9;
  --wireframe:#CFC9BC;
  --code-bg:#EFEBE3;
  --ink:#171614;
  --ink-dim:#6E6558;
  --rule:#C7C3BB;
  --accent:#C15E3E;
  --accent-2:oklch(0.50 0.14 145);
  --warn:oklch(0.58 0.14 60);
  --danger:oklch(0.55 0.17 27);
  --on-accent:#E5E1DA;
  --header-bg:rgba(229,225,218,.9);
  --hover-tint:rgba(193,94,62,.06);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .15s}
a:hover{border-bottom-color:var(--accent)}
header.site{position:sticky;top:0;background:var(--header-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--rule);z-index:10}
header.site .bar{max-width:var(--maxw);margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;font-size:14px;gap:10px}
header.site .brand{font-family:var(--serif);font-weight:600;letter-spacing:.5px}
header.site .brand span{color:var(--ink-dim);font-weight:400;margin-left:8px;font-size:13px}
header.site nav{display:inline-flex;align-items:center;gap:2px}
header.site nav a{color:var(--ink-dim);font-size:13px;padding:8px 10px;display:inline-block}
header.site nav a:hover{color:var(--ink)}
main{max-width:var(--maxw);margin:0 auto;padding:56px 24px 96px}
h1{font-family:var(--serif);font-weight:600;font-size:42px;line-height:1.15;letter-spacing:-.5px;margin:0 0 12px}
h2{font-family:var(--serif);font-weight:600;font-size:26px;line-height:1.25;margin:48px 0 14px;letter-spacing:-.2px}
h3{font-family:var(--sans);font-weight:600;font-size:14px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-dim);margin:36px 0 12px}
.eyebrow{font-family:var(--sans);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.lede{font-family:var(--serif);font-size:20px;color:var(--ink);line-height:1.5;margin:14px 0 32px}
p{margin:0 0 16px;font-size:16px;color:var(--ink)}
ul{margin:0 0 16px;padding-left:18px}
li{margin:6px 0;color:var(--ink)}
.byline{color:var(--ink-dim);font-size:13px;margin:0 0 30px;letter-spacing:.04em}
.byline em{font-style:normal;color:var(--ink)}
.divider{height:1px;background:var(--rule);margin:48px 0}
.callout{border-left:2px solid var(--accent);padding:4px 0 4px 18px;margin:24px 0;color:var(--ink);font-family:var(--serif);font-size:18px;line-height:1.5}
.tag{display:inline-block;border:1px solid var(--rule);padding:3px 10px;border-radius:999px;color:var(--ink-dim);font-size:11px;letter-spacing:.1em;text-transform:uppercase;margin-right:6px}
.fig{background:var(--panel);border:1px solid var(--rule);border-radius:12px;padding:24px;margin:28px 0;overflow:hidden}
.fig .cap{font-size:12px;color:var(--ink-dim);margin-top:14px;letter-spacing:.04em;text-align:center}
footer.site{max-width:var(--maxw);margin:0 auto;padding:28px 24px 60px;border-top:1px solid var(--rule);color:var(--ink-dim);font-size:13px}
footer.site a{color:var(--ink-dim)}
footer.site a:hover{color:var(--ink)}
footer.site .ftop{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
footer.site .legal{font-size:12px;line-height:1.7;color:var(--ink-dim);border-top:1px dashed var(--rule);padding-top:16px}
footer.site .legal strong{color:var(--ink);font-weight:600}
footer.site .legal .row{margin-bottom:4px}
.kicker{display:flex;gap:24px;margin-top:48px;flex-wrap:wrap}
.kicker .card{flex:1 1 280px;background:var(--panel);border:1px solid var(--rule);border-radius:12px;padding:22px;transition:transform .2s,border-color .2s}
.kicker .card:hover{transform:translateY(-2px);border-color:var(--accent)}
.kicker .card h4{font-family:var(--serif);font-size:18px;margin:8px 0 8px;color:var(--ink)}
.kicker .card p{font-size:14px;color:var(--ink-dim);margin:0}
.kicker .card .num{font-family:var(--mono);font-size:11px;color:var(--accent);letter-spacing:.1em}

/* THEME SWITCH */
.theme-switch{display:inline-flex;align-items:center;gap:2px;margin-left:8px;padding:2px;border:1px solid var(--rule);border-radius:8px;background:var(--panel)}
.theme-switch button{background:transparent;border:none;color:var(--ink-dim);cursor:pointer;padding:0;border-radius:5px;font-size:13px;line-height:1;font-family:var(--sans);width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;transition:background .15s,color .15s}
.theme-switch button:hover{color:var(--ink)}
.theme-switch button[aria-checked="true"]{background:var(--panel-2);color:var(--accent)}

/* INDEX hero */
main{padding-top:40px}
.hero{padding:16px 0 24px}
.hero h1{font-size:52px}
.hero .lede{font-size:22px;max-width:620px}
.index-list{margin-top:36px;border-top:1px solid var(--rule)}
.index-list a.row{display:grid;grid-template-columns:64px 1fr;gap:20px;align-items:start;padding:28px 0;border-bottom:1px solid var(--rule);color:var(--ink)}
.index-list a.row:hover{background:linear-gradient(90deg,var(--hover-tint),transparent)}
.index-list .row .glyph{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border:1px solid var(--rule);border-radius:10px;background:var(--surface)}
.index-list .row .glyph svg{width:28px;height:28px;stroke:var(--accent);fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.index-list .row .body{min-width:0}
.index-list .row .num{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.15em}
.index-list .row .t{font-family:var(--serif);font-size:24px;margin:6px 0 6px;letter-spacing:-.2px}
.index-list .row .s{font-size:14px;color:var(--ink-dim);max-width:600px}

/* --- TOPIC 1 EEG animation --- */
.eeg-stage{display:grid;grid-template-columns:120px 1fr 180px;gap:18px;align-items:center}
.eeg-stage .head{display:flex;justify-content:center}
.brain-svg{width:120px;height:120px}
.brain-svg .cap{stroke:var(--accent);stroke-width:1.5;fill:none;opacity:.8}
.brain-svg .node{fill:var(--accent);animation:pulse 1.6s infinite ease-in-out}
.brain-svg .node:nth-child(2){animation-delay:.2s}
.brain-svg .node:nth-child(3){animation-delay:.4s}
.brain-svg .node:nth-child(4){animation-delay:.6s}
.brain-svg .node:nth-child(5){animation-delay:.8s}
@keyframes pulse{0%,100%{r:2;opacity:.4}50%{r:4;opacity:1}}
@keyframes appear{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.wave-wrap{height:120px;background:var(--surface);border-radius:8px;border:1px solid var(--rule);position:relative;overflow:hidden}
.wave-wrap svg{width:100%;height:100%}
.wave-line{stroke:var(--accent);stroke-width:1.5;fill:none;stroke-dasharray:2000;stroke-dashoffset:2000;animation:trace 4s linear infinite}
@keyframes trace{to{stroke-dashoffset:0}}
.decoded{font-family:var(--mono);font-size:13px;color:var(--ink);min-height:120px;background:var(--surface);border:1px solid var(--rule);border-radius:8px;padding:14px;display:flex;align-items:center;flex-wrap:wrap;line-height:1.7}
.decoded-inner{width:100%}
.decoded .word{opacity:0;animation:appear .4s forwards;margin-right:.4em;display:inline-block}
.context-row{display:flex;gap:18px;margin-top:14px;align-items:center;font-size:13px;color:var(--ink-dim)}
.wrist{display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--accent-2);animation:hb 1.4s infinite}
@keyframes hb{0%,100%{transform:scale(1)}50%{transform:scale(1.6)}}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 6px}
.compare .col{background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:16px}
.compare .col h5{margin:0 0 6px;font-family:var(--sans);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-dim)}
.compare .col .v{font-family:var(--serif);font-size:18px;color:var(--ink);margin-bottom:4px}
.compare .col .n{font-size:12px;color:var(--ink-dim)}
.compare .col.ours{border-color:var(--accent)}
.compare .col.ours .v{color:var(--accent)}

/* --- TOPIC 2 split --- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.split .col{background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:18px;min-height:240px;position:relative;overflow:hidden;display:flex;flex-direction:column}
.split h5{margin:0 0 14px;font-family:var(--sans);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-dim)}
.legacy-ui .row{height:10px;background:var(--wireframe);border-radius:3px;margin-bottom:8px}
.legacy-ui .row.short{width:60%}.legacy-ui .row.mid{width:80%}
.legacy-ui .tabs{display:flex;gap:6px;margin-bottom:14px}
.legacy-ui .tabs span{height:18px;width:50px;background:var(--wireframe);border-radius:3px}
.legacy-ui .tabs span:first-child{background:var(--rule)}
.legacy-ui .btn{display:inline-block;background:var(--wireframe);height:22px;width:80px;border-radius:4px;margin-top:8px;margin-right:6px}
.agent-ui .agent-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px}
.agent-ui .agent-status{color:var(--ink-dim);font-size:11px;letter-spacing:.14em;text-transform:uppercase;opacity:.6}
.agent-ui .agent-status::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:8px;vertical-align:middle;animation:hb 1.6s infinite}
.agent-ui .micro{background:var(--panel-2);border:1px solid var(--accent);border-radius:10px;padding:14px;opacity:0;transform:translateY(8px);animation:microcard 6s infinite}
.agent-ui .micro .q{font-family:var(--serif);font-size:15px;margin-bottom:10px;color:var(--ink)}
.agent-ui .micro .actions{display:flex;gap:8px}
.agent-ui .micro .b{font-size:12px;padding:6px 12px;border-radius:6px;border:1px solid var(--rule);color:var(--ink)}
.agent-ui .micro .b.primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
@keyframes microcard{0%,15%{opacity:0;transform:translateY(8px)}25%,70%{opacity:1;transform:translateY(0)}85%,100%{opacity:0;transform:translateY(-8px)}}
.flow-90-10{margin:24px 0;background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:20px}
.flow-90-10 .bar{display:flex;height:36px;border-radius:6px;overflow:hidden;background:var(--wireframe)}
.flow-90-10 .bar .auto{flex:9;background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 70%,#000));display:flex;align-items:center;justify-content:center;color:var(--on-accent);font-weight:700;font-size:13px;font-family:var(--mono);white-space:nowrap}
.flow-90-10 .bar .human{flex:1;min-width:68px;background:var(--warn);display:flex;align-items:center;justify-content:center;color:var(--on-accent);font-weight:700;font-size:13px;font-family:var(--mono);white-space:nowrap}
.flow-90-10 .lab{display:flex;justify-content:space-between;margin-top:8px;font-size:12px;color:var(--ink-dim)}

/* --- TOPIC 3 architecture --- */
.arch{background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:20px;position:relative;height:380px;overflow:hidden}
.arch-frame{width:100%;overflow-x:auto}
.arch svg{width:100%;height:100%}
.arch .stage-ctrl{display:flex;gap:8px;justify-content:center;margin-top:14px}
.arch .stage-ctrl button{background:transparent;border:1px solid var(--rule);color:var(--ink-dim);padding:6px 14px;border-radius:6px;font-size:12px;cursor:pointer;font-family:var(--sans)}
.arch .stage-ctrl button.active{border-color:var(--accent);color:var(--accent)}
.arch .stage-ctrl button:hover{color:var(--ink)}
.node-box{fill:var(--panel-2);stroke:var(--rule);stroke-width:1}
.node-box.lit{stroke:var(--accent);fill:color-mix(in srgb,var(--accent) 12%,var(--panel-2))}
.node-box.green{stroke:var(--accent-2);fill:color-mix(in srgb,var(--accent-2) 12%,var(--panel-2))}
.node-box.amber{stroke:var(--warn);fill:color-mix(in srgb,var(--warn) 12%,var(--panel-2))}
.node-label{fill:var(--ink);font-family:var(--sans);font-size:11px}
.node-sub{fill:var(--ink-dim);font-family:var(--mono);font-size:9px}
.arch-edge{stroke:var(--rule);stroke-width:1;fill:none;stroke-dasharray:3 3}
.arch-edge.lit{stroke:var(--accent);stroke-dasharray:none}
.caller-demo{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.caller-demo .col{background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:16px}
.caller-demo .col h5{margin:0 0 10px;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-dim)}
.caller-demo code{display:block;font-family:var(--mono);font-size:12px;color:var(--ink);background:var(--code-bg);padding:10px;border-radius:6px;border:1px solid var(--rule);white-space:pre-wrap;line-height:1.5}
.caller-demo .dev code .scrubbed{color:var(--danger)}
.caller-demo .rep code .agg{color:var(--accent-2)}

@media(max-width:680px){
  h1{font-size:32px}.hero h1{font-size:36px}
  main{padding:28px 20px 80px}
  .eeg-stage{grid-template-columns:1fr;gap:14px}
  .split,.caller-demo,.compare{grid-template-columns:1fr}
  .arch{height:auto;min-height:300px;padding:14px}
  .kicker{gap:14px}
  header.site .bar{padding:10px 16px;flex-wrap:wrap;gap:4px}
  header.site nav a{padding:6px 8px;font-size:12px}
  .theme-switch{margin-left:4px}
  .agent-ui{min-height:240px}
  footer.site{flex-direction:column;gap:8px;text-align:center}
}
@media(max-width:480px){
  h1{font-size:28px}.hero h1{font-size:30px}
  .lede{font-size:17px}
  h2{font-size:22px;margin-top:36px}
  main{padding:20px 16px 60px}
  .index-list a.row{grid-template-columns:40px 1fr;gap:14px;padding:22px 0}
  .index-list .row .glyph{width:36px;height:36px}
  .index-list .row .glyph svg{width:20px;height:20px}
  .index-list .row .t{font-size:20px}
  .fig{padding:14px}
  .flow-90-10{padding:14px}
  .flow-90-10 .bar{height:32px}
  .flow-90-10 .bar .auto,.flow-90-10 .bar .human{font-size:11px}
  .arch{padding:10px}
  .arch svg .node-label{font-size:18px}
  .arch svg .node-sub{font-size:14px}
  .stage-ctrl{flex-wrap:wrap}
  .compare .col .v{font-size:16px}
  .caller-demo code{font-size:11px}
  .split .col{min-height:220px}
}