/* ── RESET ─────────────────────────────── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg);color:var(--text);
  font-family:'Overused Grotesk',sans-serif;
  font-weight:400;font-size:16px;line-height:1.6;overflow-x:hidden;
  transition:background .3s,color .3s;
}
a{color:inherit;text-decoration:none;}

/* ── LIGHT THEME (default) ──────────────── */
:root{
  --bg:    #fafaf8;
  --bg2:   #f2f2f0;
  --bg3:   #e8e8e6;
  --text:  #1a1a1a;
  --muted: #6b6b6b;
  --teal:  #3a7bbf;
  --org:   #e04500;
  --red:   #cc3333;
  --amber: #cc8800;
  --green: #2a9960;
  --b:     rgba(0,0,0,.08);
  --bm:    rgba(0,0,0,.14);
  --ease:  cubic-bezier(.25,.46,.45,.94);
  --nh:    64px;
  --card:  #ffffff;
  --input: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,.06);
}

/* ── DARK THEME ─────────────────────────── */
[data-theme="dark"]{
  --bg:    #101010;
  --bg2:   #161618;
  --bg3:   #1e1e22;
  --text:  #eeebe4;
  --muted: #a8a5a0;
  --teal:  #5584bd;
  --org:   #ff4500;
  --red:   #e05050;
  --amber: #e09030;
  --green: #30c080;
  --b:     rgba(238,235,228,.1);
  --bm:    rgba(238,235,228,.2);
  --card:  #161618;
  --input: #1e1e22;
  --shadow: 0 1px 3px rgba(0,0,0,.3);
}

/* ── PROGRESS BAR ───────────────────────── */
#bar{
  position:fixed;inset:0 0 auto;height:2px;width:0;z-index:9000;
  background:linear-gradient(90deg,var(--teal),#8ab0e0);
  transition:width .08s linear;
}

/* ── NAV ────────────────────────────────── */
#nav{
  position:fixed;inset:0 0 auto;height:var(--nh);z-index:800;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 40px;
  border-bottom:1px solid transparent;
  transition:background .4s,border-color .4s,backdrop-filter .4s;
}
#nav.stuck{
  background:rgba(250,250,248,.92);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-color:var(--b);
}
[data-theme="dark"] #nav.stuck{background:rgba(16,16,16,.92);}

.nlogo{display:flex;align-items:center;gap:12px;cursor:pointer;}
.nmark{
  width:32px;height:32px;border:1.5px solid var(--teal);
  display:grid;place-items:center;
  font-family:'Space Mono',monospace;font-size:11px;font-weight:700;
  color:var(--teal);letter-spacing:.04em;
}
.nname{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--text);font-weight:500;}
.nnav{display:flex;gap:28px;list-style:none;}
.nnav a{font-size:13px;letter-spacing:.06em;text-transform:uppercase;
        color:var(--muted);transition:color .2s;font-weight:400;}
.nnav a:hover,.nnav a.active{color:var(--text);}
.nr{display:flex;align-items:center;gap:16px;}

/* ── THEME TOGGLE ───────────────────────── */
.theme-btn{
  width:40px;height:40px;border:1.5px solid var(--bm);border-radius:8px;
  background:var(--card);cursor:pointer;display:grid;place-items:center;
  font-size:18px;transition:all .2s;color:var(--text);
}
.theme-btn:hover{border-color:var(--teal);background:var(--bg2);}

/* ── ENGINE BUTTON ──────────────────────── */
.eng-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 18px;border:1px solid var(--teal);border-radius:6px;
  font-size:13px;letter-spacing:.04em;text-transform:uppercase;
  color:var(--teal);background:transparent;
  transition:all .2s;cursor:pointer;font-weight:500;
}
.eng-btn:hover{background:var(--teal);color:#fff;}

/* ── SECTIONS ───────────────────────────── */
section{padding:80px 40px;}
.sect-inner{max-width:1080px;margin:0 auto;}

/* ── HERO ───────────────────────────────── */
#hero{
  min-height:100vh;display:flex;align-items:center;
  padding-top:var(--nh);padding-bottom:60px;
  padding-left:40px;padding-right:40px;
}
.hero-inner{max-width:1080px;margin:0 auto;width:100%;}
.hero-tag{
  font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--teal);margin-bottom:24px;
  display:flex;align-items:center;gap:10px;
}
.hero-tag::before{content:'';display:block;width:24px;height:1.5px;background:var(--teal);}
.hero-h{
  font-size:clamp(36px,5vw,72px);font-weight:700;line-height:1.05;
  letter-spacing:-.02em;margin-bottom:24px;max-width:780px;
}
.hero-h em{font-style:normal;color:var(--teal);}
.hero-sub{
  font-size:17px;color:var(--muted);max-width:520px;
  line-height:1.65;margin-bottom:40px;font-weight:300;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ── BUTTONS ────────────────────────────── */
.btn-prim{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 24px;border:none;border-radius:6px;
  background:var(--teal);color:#fff;
  font-size:14px;letter-spacing:.04em;text-transform:uppercase;font-weight:600;
  cursor:pointer;transition:background .2s;
}
.btn-prim:hover{background:#2d6aa5;}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;border:1px solid var(--bm);border-radius:6px;
  background:transparent;color:var(--muted);
  font-size:14px;letter-spacing:.04em;text-transform:uppercase;
  cursor:pointer;transition:all .2s;
}
.btn-ghost:hover{color:var(--text);border-color:var(--text);}

/* ── CARDS ──────────────────────────────── */
.card{
  background:var(--card);border:1px solid var(--b);border-radius:8px;
  padding:24px;box-shadow:var(--shadow);transition:box-shadow .2s;
}
.card:hover{box-shadow:0 2px 8px rgba(0,0,0,.08);}
[data-theme="dark"] .card:hover{box-shadow:0 2px 8px rgba(0,0,0,.4);}

.card-title{
  font-size:15px;font-weight:600;margin-bottom:8px;line-height:1.3;
}
.card-desc{font-size:14px;color:var(--muted);line-height:1.6;}
.card-label{
  font-size:12px;font-weight:500;color:var(--teal);letter-spacing:.04em;
  text-transform:uppercase;margin-bottom:12px;
}

/* ── SECTION HEADINGS ───────────────────── */
.sect-head{
  font-size:22px;font-weight:600;margin-bottom:8px;line-height:1.2;
}
.sect-sub{
  font-size:15px;color:var(--muted);margin-bottom:32px;max-width:600px;line-height:1.65;
}

/* ── INPUTS ─────────────────────────────── */
.demo-input{
  width:100%;background:var(--input);border:1px solid var(--b);
  border-radius:6px;padding:14px 16px;
  font-family:'Overused Grotesk',sans-serif;font-size:15px;
  color:var(--text);outline:none;transition:border-color .15s;
}
.demo-input:focus{border-color:var(--teal);}
.demo-submit{
  padding:14px 24px;background:var(--teal);border:none;border-radius:6px;
  color:#fff;font-size:14px;letter-spacing:.04em;text-transform:uppercase;
  font-weight:600;cursor:pointer;transition:background .2s;white-space:nowrap;
}
.demo-submit:hover{background:#2d6aa5;}
.demo-submit:disabled{background:var(--bg3);color:var(--muted);cursor:not-allowed;}

/* ── SELECT BUTTONS (no dropdowns) ──────── */
.btn-group{display:flex;gap:6px;flex-wrap:wrap;}
.btn-opt{
  padding:10px 18px;border:1px solid var(--b);border-radius:6px;
  background:var(--card);color:var(--muted);
  font-size:13px;font-weight:500;letter-spacing:.02em;
  cursor:pointer;transition:all .15s;user-select:none;
}
.btn-opt:hover{border-color:var(--bm);color:var(--text);}
.btn-opt.on{
  border-color:var(--teal);background:rgba(58,123,191,.08);
  color:var(--teal);font-weight:600;
}

/* ── MODEL TRACKS ───────────────────────── */
.model-tracks{display:flex;flex-direction:column;gap:14px;margin-bottom:24px;}
.track{
  background:var(--card);border:1px solid var(--b);border-radius:6px;
  overflow:hidden;opacity:.4;transition:opacity .3s;
}
.track.active{opacity:1;}
.track-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;border-bottom:1px solid var(--b);
}
.track-model{font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.06em;
             text-transform:uppercase;color:var(--muted);}
.track-status{font-family:'Space Mono',monospace;font-size:11px;color:var(--teal);}
.track-body{padding:14px 16px;font-size:14px;color:var(--text);line-height:1.7;
            min-height:52px;white-space:pre-wrap;}

/* agreement bar */
.agree-row{
  display:flex;align-items:center;gap:16px;padding:16px 0;
  border-top:1px solid var(--b);
}
.agree-label{font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.06em;
             text-transform:uppercase;color:var(--muted);white-space:nowrap;}
.agree-track{flex:1;height:6px;background:var(--b);border-radius:3px;overflow:hidden;}
.agree-fill{height:100%;border-radius:3px;transition:width .8s var(--ease);}
.agree-val{font-family:'Space Mono',monospace;font-size:13px;color:var(--text);
           white-space:nowrap;min-width:36px;text-align:right;}
.stability-badge{
  font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.04em;
  text-transform:uppercase;padding:4px 10px;border-radius:4px;
}
.stb-stable  {background:rgba(42,153,96,.1);color:var(--green);border:1px solid rgba(42,153,96,.25);}
.stb-mixed   {background:rgba(204,136,0,.1); color:var(--amber);border:1px solid rgba(204,136,0,.25);}
.stb-divergent{background:rgba(204,51,51,.1); color:var(--red);  border:1px solid rgba(204,51,51,.25);}

/* ── CONCEPTS SECTION ───────────────────── */
.concepts-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;
  margin-top:32px;
}
.concept-card{
  background:var(--card);border:1px solid var(--b);border-radius:8px;
  padding:28px 24px;box-shadow:var(--shadow);
  transition:all .2s;cursor:pointer;
}
.concept-card:hover{box-shadow:0 3px 12px rgba(0,0,0,.08);border-color:var(--teal);}
[data-theme="dark"] .concept-card:hover{box-shadow:0 3px 12px rgba(0,0,0,.4);}
.cc-num{
  font-family:'Space Mono',monospace;font-size:12px;color:var(--teal);
  letter-spacing:.06em;margin-bottom:16px;
}
.cc-title{font-size:18px;font-weight:600;margin-bottom:10px;line-height:1.25;}
.cc-desc{font-size:14px;color:var(--muted);line-height:1.6;}

/* ── PATTERNS SECTION ───────────────────── */
.pat-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:16px;margin-top:32px;
}
.pat-card{
  background:var(--card);border:1px solid var(--b);border-radius:8px;
  padding:24px;box-shadow:var(--shadow);
  transition:all .2s;cursor:default;
}
.pat-card:hover{box-shadow:0 3px 12px rgba(0,0,0,.08);}
[data-theme="dark"] .pat-card:hover{box-shadow:0 3px 12px rgba(0,0,0,.4);}
.pat-sev{display:flex;gap:2px;margin-bottom:14px;}
.sev-pip{width:12px;height:5px;border-radius:2px;background:var(--bg3);}
.sev-pip.on{background:var(--red);}
.pat-name{font-size:16px;font-weight:600;margin-bottom:8px;}
.pat-desc{font-size:13px;color:var(--muted);line-height:1.6;margin-bottom:12px;}
.pat-refs{font-family:'Space Mono',monospace;font-size:11px;color:var(--muted);
          letter-spacing:.03em;opacity:.7;}

/* ── AXIOM SECTION ──────────────────────── */
#axiom{
  background:var(--bg2);border-top:1px solid var(--b);
  text-align:center;padding:80px 40px;
}
.axiom-quote{
  font-size:clamp(18px,2.5vw,32px);font-weight:300;line-height:1.4;
  max-width:680px;margin:0 auto 20px;color:var(--text);
  font-style:italic;letter-spacing:-.01em;
}
.axiom-attr{
  font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted);
}

/* ── ENGINE (dashboard) ─────────────────── */
#engine{display:none;}
#engine.open{display:block;}
.engine-head{
  height:var(--nh);display:flex;align-items:center;gap:16px;
  padding:0 40px;border-bottom:1px solid var(--b);
  position:sticky;top:0;z-index:100;
  background:rgba(250,250,248,.95);backdrop-filter:blur(12px);
}
[data-theme="dark"] .engine-head{background:rgba(16,16,16,.95);}
.engine-title{
  font-family:'Space Mono',monospace;font-size:13px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--text);
}
.engine-tabs{display:flex;gap:0;margin-left:auto;}
.etab{
  padding:8px 16px;font-size:12px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--muted);border:none;background:none;cursor:pointer;
  border-bottom:2px solid transparent;transition:all .15s;
}
.etab:hover{color:var(--text);}
.etab.active{color:var(--teal);border-bottom-color:var(--teal);}
.back-btn{
  font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);
  border:none;background:none;cursor:pointer;display:flex;align-items:center;gap:6px;
  transition:color .15s;
}
.back-btn:hover{color:var(--text);}

.engine-body{padding:32px 40px;max-width:1080px;margin:0 auto;}

/* engine form blocks */
.e-block{
  background:var(--card);border:1px solid var(--b);border-radius:8px;
  padding:24px;margin-bottom:20px;box-shadow:var(--shadow);
}
.e-block h3{
  font-family:'Space Mono',monospace;font-size:13px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--text);margin-bottom:20px;
  padding-bottom:12px;border-bottom:1px solid var(--b);
}
.e-row{margin-bottom:14px;}
.e-row label{
  display:block;font-size:12px;letter-spacing:.04em;text-transform:uppercase;
  color:var(--muted);margin-bottom:6px;font-weight:500;
}
.e-row input,.e-row textarea,.e-row select{
  width:100%;background:var(--input);border:1px solid var(--b);
  color:var(--text);padding:10px 14px;font-family:'Overused Grotesk',sans-serif;
  font-size:14px;border-radius:6px;outline:none;transition:border-color .15s;
}
.e-row input:focus,.e-row textarea:focus,.e-row select:focus{
  border-color:var(--teal);
}
.e-row textarea{resize:vertical;min-height:72px;}
.e-row select option{background:var(--input);}

.e-result{
  background:var(--bg2);border:1px solid var(--b);border-radius:8px;
  padding:20px;margin-top:16px;display:none;
}
.e-result.show{display:block;}
.e-result-label{
  font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--muted);margin-bottom:12px;
  display:flex;align-items:center;justify-content:space-between;
}
.e-result-text{font-size:14px;color:var(--text);line-height:1.7;white-space:pre-wrap;}

/* stats row */
.stat-row{display:flex;gap:1px;background:var(--b);border:1px solid var(--b);
          margin-bottom:24px;border-radius:8px;overflow:hidden;}
.stat-box{flex:1;background:var(--card);padding:20px;text-align:center;}
.stat-n{font-family:'Space Mono',monospace;font-size:28px;font-weight:700;
        color:var(--text);line-height:1;}
.stat-l{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);
        margin-top:6px;}
.stat-box.c-teal .stat-n{color:var(--teal);}
.stat-box.c-red   .stat-n{color:var(--red);}
.stat-box.c-green .stat-n{color:var(--green);}
.stat-box.c-amber .stat-n{color:var(--amber);}

/* data table */
.dtable{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:24px;}
.dtable th{
  text-align:left;padding:10px 14px;
  font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--b);
  font-weight:500;
}
.dtable td{padding:10px 14px;border-bottom:1px solid var(--b);color:var(--text);
           vertical-align:middle;}
.dtable tr:hover td{background:rgba(0,0,0,.02);}
[data-theme="dark"] .dtable tr:hover td{background:rgba(255,255,255,.02);}

/* spinner */
.spin{display:inline-block;width:12px;height:12px;border:2px solid var(--bg3);
      border-top-color:var(--teal);border-radius:50%;animation:spin .6s linear infinite;}
@keyframes spin{to{transform:rotate(360deg)}}

/* badges */
.bstable  {background:rgba(42,153,96,.1);color:var(--green);border:1px solid rgba(42,153,96,.2);}
.bmixed   {background:rgba(204,136,0,.1);color:var(--amber);border:1px solid rgba(204,136,0,.2);}
.bdivergent{background:rgba(204,51,51,.1);color:var(--red);  border:1px solid rgba(204,51,51,.2);}
.badge{display:inline-block;padding:3px 8px;border-radius:4px;
       font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.04em;text-transform:uppercase;}

/* fragility bars */
.fbar{display:flex;gap:3px;}
.fpip{width:18px;height:28px;border-radius:3px;cursor:help;}

/* ── FOOTER ─────────────────────────────── */
footer{
  padding:36px 40px;border-top:1px solid var(--b);
  display:flex;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
footer .fm{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.06em;
           text-transform:uppercase;}

/* ── RESPONSIVE ─────────────────────────── */
@media(max-width:768px){
  #nav{padding:0 20px;}
  #hero,section{padding-left:20px;padding-right:20px;}
  #axiom{padding:60px 20px;}
  footer{padding:24px 20px;flex-direction:column;gap:10px;text-align:center;}
  .engine-head{padding:0 20px;}
  .engine-body{padding:20px;}
  .nnav{display:none;}
  .stat-row{flex-wrap:wrap;}
  .stat-box{min-width:calc(50% - 1px);}
}
@media(max-width:480px){
  .hero-h{font-size:32px;}
}

/* scrollbar */
::-webkit-scrollbar{width:6px;}
::-webkit-scrollbar-track{background:var(--bg);}
::-webkit-scrollbar-thumb{background:var(--bg3);border-radius:3px;}

/* ── VECTOR CHIPS (kept for compat) ─────── */
.vchip{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 16px;border:1px solid var(--b);border-radius:6px;
  background:var(--card);color:var(--muted);
  font-size:13px;font-weight:500;letter-spacing:.02em;
  cursor:pointer;transition:all .15s;user-select:none;
}
.vchip:hover{border-color:var(--bm);color:var(--text);}
.vchip.on{
  border-color:var(--teal);background:rgba(58,123,191,.08);
  color:var(--teal);font-weight:600;
}