/* ============================================================
   VANNEVAR — shared stylesheet
   Brand system per Style_Guide_V2: Montserrat (display) + Arial
   (body/system), red #a61e2f / near-black #1e1e1e / gold #f0b431
   as the core triad, navy #002b5c + grey #b1b7b7 as secondary.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@500;600;700;800&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --graphite-0: #1E1E1E;   /* brand near-black — primary background */
  --graphite-1: #262626;
  --graphite-2: #2F2F2F;
  --graphite-3: #3A3A3A;
  --line: #3D3D3D;
  --ink: #F5F5F3;
  --ink-dim: #B1B7B7;      /* brand grey */
  --ink-faint: #7D8383;

  --navy: #002B5C;         /* brand navy — signature section fills */

  --gas: #B1B7B7;          /* brand grey, reused as third phase accent */
  --fluid: #A61E2F;        /* brand red */
  --solids: #F0B431;       /* brand gold */

  /* dedicated substance-indicator colors (gas/fluid/solids chips only —
     kept separate from --gas/--fluid/--solids above, which double as
     general UI accents elsewhere, e.g. links and buttons) */
  --phase-gas: #A61E2F;    /* gas = red */
  --phase-fluid: #4A90E2;  /* fluid/liquid = blue */
  --phase-solids: #F0B431; /* solids = yellow/gold */

  --radius: 2px;
  --max: 1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--graphite-0);
  color:var(--ink);
  font-family:Arial,Helvetica,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:'Montserrat',Arial,sans-serif;
  font-weight:700;
  letter-spacing:0.01em;
  margin:0 0 .5em 0;
  color:var(--ink);
}

a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.mono{font-family:'IBM Plex Mono',monospace;}

.wrap{max-width:var(--max);margin:0 auto;padding:0 28px;}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--gas);
  margin-bottom:14px;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--gas);
  display:inline-block;
}

/* ---------- nav ---------- */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(12,15,17,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-row{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 28px;
  max-width:var(--max);margin:0 auto;
}
.brand{
  display:inline-flex;
  align-items:center;
}
.brand-logo{height:26px;width:auto;display:block;}
nav.links{display:flex;gap:30px;}
nav.links a{
  font-size:13px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--ink-dim);
  font-family:'IBM Plex Mono',monospace;
  transition:color .15s;
}
nav.links a:hover,nav.links a.active{color:var(--gas);}
.nav-cta{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  border:1px solid var(--line);
  padding:8px 16px;
  color:var(--ink);
  transition:border-color .15s,color .15s;
}
.nav-cta:hover{border-color:var(--gas);color:var(--gas);}

/* ---------- phase chips (signature wayfinding device) ---------- */
.phase-chips{display:flex;gap:10px;flex-wrap:wrap;}
.chip{
  display:inline-flex;align-items:center;gap:7px;
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  padding:6px 11px;
  border:1px solid var(--line);
  color:var(--ink-dim);
  border-radius:2px;
}
.chip .dot{width:7px;height:7px;border-radius:50%;flex:none;}
.chip.gas .dot{background:var(--phase-gas);box-shadow:0 0 6px var(--phase-gas);}
.chip.fluid .dot{background:var(--phase-fluid);box-shadow:0 0 6px var(--phase-fluid);}
.chip.solids .dot{background:var(--phase-solids);box-shadow:0 0 6px var(--phase-solids);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;letter-spacing:.05em;text-transform:uppercase;
  padding:13px 22px;
  border:1px solid var(--ink);
  color:var(--ink);
  transition:all .15s;
}
.btn:hover{background:var(--ink);color:var(--graphite-0);}
.btn.primary{background:var(--fluid);border-color:var(--fluid);color:#fff;}
.btn.primary:hover{background:#a8391f;border-color:#a8391f;color:#fff;}
.btn-row{display:flex;gap:16px;flex-wrap:wrap;}

/* ---------- hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(ellipse 80% 60% at 75% 20%, rgba(166,30,47,0.10), transparent),
    var(--graphite-0);
}
.hero-video{
  position:absolute;inset:0;z-index:0;
}
.hero-video video{
  width:100%;height:100%;object-fit:cover;opacity:0.55;
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(90deg, var(--graphite-0) 20%, rgba(30,30,30,0.55) 55%, rgba(30,30,30,0.15) 100%);
}
.hero-inner{
  position:relative;z-index:2;
  padding:120px 0 100px;
}
.about-render{
  position:absolute;
  right:-8%;top:50%;
  transform:translateY(-50%) rotate(4deg);
  width:60%;
  max-width:640px;
  opacity:0.9;
  pointer-events:none;
  mix-blend-mode:screen;
}
.hero h1{
  font-size:clamp(40px,6vw,74px);
  line-height:1.02;
  text-transform:uppercase;
  max-width:820px;
  margin-bottom:22px;
}
.hero p.lead{
  font-size:18px;
  color:var(--ink-dim);
  max-width:520px;
  margin-bottom:34px;
}

/* ---------- section rhythm ---------- */
section{padding:88px 0;border-bottom:1px solid var(--line);}
section.tight{padding:60px 0;}
.section-head{
  display:flex;justify-content:space-between;align-items:flex-end;
  gap:24px;margin-bottom:44px;flex-wrap:wrap;
}
.section-head h2{font-size:clamp(28px,3.4vw,40px);text-transform:uppercase;max-width:640px;}
.section-head p{color:var(--ink-dim);max-width:420px;margin:0;}

/* ---------- legend strip ---------- */
.legend-strip{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.legend-cell{
  background:var(--graphite-1);
  padding:30px 28px;
}
.legend-cell .tag{
  font-family:'IBM Plex Mono',monospace;font-size:12px;
  letter-spacing:.1em;text-transform:uppercase;
  display:flex;align-items:center;gap:8px;margin-bottom:10px;
}
.legend-cell .tag .dot{width:9px;height:9px;border-radius:50%;}
.legend-cell.gas .tag .dot{background:var(--phase-gas);box-shadow:0 0 8px var(--phase-gas);}
.legend-cell.fluid .tag .dot{background:var(--phase-fluid);box-shadow:0 0 8px var(--phase-fluid);}
.legend-cell.solids .tag .dot{background:var(--phase-solids);box-shadow:0 0 8px var(--phase-solids);}
.legend-cell.gas .tag{color:var(--phase-gas);}
.legend-cell.fluid .tag{color:var(--phase-fluid);}
.legend-cell.solids .tag{color:var(--phase-solids);}
.legend-cell p{color:var(--ink-dim);font-size:14px;margin:0;}

/* ---------- product grid ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.product-card{
  background:var(--graphite-1);
  padding:30px 26px;
  display:flex;flex-direction:column;gap:14px;
  transition:background .15s;
  min-height:230px;
}
.product-card:hover{background:var(--graphite-2);}
.product-card .pthumb{width:100%;height:110px;display:flex;align-items:center;justify-content:center;margin-bottom:4px;}
.product-card .pthumb img{max-width:100%;max-height:100%;object-fit:contain;}
.product-card .pname{font-family:'Montserrat',Arial,sans-serif;font-size:22px;text-transform:uppercase;}
.product-card .ptype{font-size:13px;color:var(--ink-faint);font-family:'IBM Plex Mono',monospace;}
.product-card p.desc{color:var(--ink-dim);font-size:14px;margin:0;flex:1;}
.product-card .go{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--gas);text-transform:uppercase;letter-spacing:.06em;}
.product-card.pending{cursor:default;}
.product-card.pending:hover{background:var(--graphite-1);}
.product-card.pending .pname{color:var(--ink-dim);}
.product-card.pending .go{color:var(--ink-faint);}
.pending-tag{
  display:inline-flex;align-items:center;gap:7px;
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-faint);
}
.pending-tag::before{content:"";width:7px;height:7px;border-radius:50%;border:1px solid var(--ink-faint);flex:none;}
.lift-nav{display:flex;gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:60px;}
.lift-nav a{
  flex:1;background:var(--graphite-1);padding:22px 24px;
  display:flex;flex-direction:column;gap:4px;
  transition:background .15s;
}
.lift-nav a:hover{background:var(--graphite-2);}
.lift-nav .lname{font-family:'Montserrat',Arial,sans-serif;font-weight:700;font-size:16px;text-transform:uppercase;color:var(--ink);}
.lift-nav .ldesc{font-size:13px;color:var(--ink-dim);}

/* ---------- values ---------- */
.values-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.value-card{background:var(--graphite-1);padding:26px 20px;}
.value-card h3{font-size:16px;text-transform:uppercase;margin-bottom:8px;}
.value-card p{font-size:13.5px;color:var(--ink-dim);margin:0;}

/* ---------- video ---------- */
.video-slot{
  position:relative;
  aspect-ratio:16/9;
  background:var(--graphite-2);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.video-slot .play{
  width:64px;height:64px;border-radius:50%;
  border:1px solid var(--ink-dim);
  display:flex;align-items:center;justify-content:center;
  color:var(--ink);
}
.video-slot .caption{
  position:absolute;bottom:0;left:0;right:0;
  padding:16px 20px;
  background:linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ink-dim);
}
.video-slot video{width:100%;height:100%;object-fit:cover;display:block;background:#000;}
.video-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}

/* ---------- mission quote ---------- */
.mission{
  background:var(--navy);
  padding:80px 0;
  border-bottom:1px solid var(--line);
}
.mission blockquote{
  margin:0;
  font-family:'Montserrat',Arial,sans-serif;
  font-size:clamp(22px,2.6vw,32px);
  font-weight:400;
  line-height:1.4;
  color:#fff;
  max-width:880px;
}
.mission blockquote::before{content:"“";color:var(--solids);}
.mission blockquote::after{content:"”";color:var(--solids);}

/* ---------- footer ---------- */
footer.site{padding:50px 0;}
.footer-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;}
.footer-links{display:flex;gap:26px;flex-wrap:wrap;}
.footer-links a{font-size:13px;color:var(--ink-dim);font-family:'IBM Plex Mono',monospace;text-transform:uppercase;letter-spacing:.05em;}
.footer-links a:hover{color:var(--gas);}
.footer-meta{font-size:12px;color:var(--ink-faint);font-family:'IBM Plex Mono',monospace;}

/* ---------- product detail page ---------- */
.detail-hero{
  padding:70px 0 60px;
  border-bottom:1px solid var(--line);
}
.detail-hero .grid2{
  display:grid;grid-template-columns:1.05fr 0.95fr;gap:60px;align-items:center;
}
.detail-hero h1{font-size:clamp(38px,5.4vw,64px);text-transform:uppercase;margin:14px 0 18px;}
.render-frame{
  background:radial-gradient(ellipse at 50% 50%, rgba(240,180,49,0.07), transparent 70%);
  border:1px solid var(--line);
  padding:20px;
}

.mechanism-row{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;}
.step-list{list-style:none;margin:0;padding:0;counter-reset:step;}
.step-list li{
  counter-increment:step;
  padding:20px 0 20px 46px;
  position:relative;
  border-top:1px solid var(--line);
}
.step-list li:last-child{border-bottom:1px solid var(--line);}
.step-list li::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:20px;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;color:var(--fluid);
}
.step-list h4{font-size:16px;margin-bottom:6px;text-transform:none;}
.step-list p{margin:0;color:var(--ink-dim);font-size:14px;}

.feature-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px 32px;}
.feature-list li{
  padding-left:22px;position:relative;
  font-size:14.5px;color:var(--ink);
  border-left:2px solid var(--fluid);
  padding:2px 0 2px 16px;
}

table.spec{width:100%;border-collapse:collapse;font-family:'IBM Plex Mono',monospace;font-size:13.5px;}
table.spec caption{text-align:left;font-family:Arial,sans-serif;color:var(--ink-dim);font-size:13px;margin-bottom:10px;caption-side:top;}
table.spec th,table.spec td{border:1px solid var(--line);padding:12px 14px;text-align:left;}
table.spec th{background:var(--graphite-2);color:var(--gas);font-weight:500;text-transform:uppercase;font-size:11.5px;letter-spacing:.06em;}
table.spec td{color:var(--ink-dim);}
table.spec tr td:first-child{color:var(--ink);}

.variant-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.variant-card{background:var(--graphite-1);padding:24px;}
.variant-card .pname{font-family:'Montserrat',Arial,sans-serif;font-size:18px;text-transform:uppercase;margin-bottom:6px;}
.variant-card p{font-size:13.5px;color:var(--ink-dim);margin:0 0 12px;}

.confidential-note{
  font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--ink-faint);
  border-top:1px solid var(--line);padding-top:14px;margin-top:40px;
}

/* ---------- technical page ---------- */
.filter-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:40px;}
.filter-chip{
  font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.05em;text-transform:uppercase;
  padding:9px 16px;border:1px solid var(--line);color:var(--ink-dim);cursor:pointer;transition:all .15s;
}
.filter-chip:hover,.filter-chip.active{border-color:var(--gas);color:var(--gas);}

.tech-card{background:var(--graphite-1);border:1px solid var(--line);padding:0;margin-bottom:1px;}
.tech-card-head{
  display:flex;justify-content:space-between;align-items:center;
  padding:22px 26px;border-bottom:1px solid var(--line);flex-wrap:wrap;gap:14px;
}
.tech-card-head h3{font-size:19px;text-transform:uppercase;margin:0;}
.tech-card-body{padding:22px 26px;}
.tech-card-body table.spec{margin-top:0;}
.tech-card-body p.mechanism{color:var(--ink-dim);font-size:14px;margin:0 0 18px;max-width:760px;}

.principle-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.principle-card{background:var(--graphite-1);padding:28px 24px;}
.principle-card .num{font-family:'IBM Plex Mono',monospace;color:var(--fluid);font-size:13px;margin-bottom:10px;}
.principle-card h3{font-size:18px;text-transform:uppercase;margin-bottom:10px;}
.principle-card p{font-size:14px;color:var(--ink-dim);margin:0;}

/* ---------- responsive ---------- */
@media (max-width: 1100px){
  nav.links{display:none;}
  .nav-toggle{display:flex;order:3;margin-left:16px;}
  .nav-row{justify-content:flex-start;}
  .brand{margin-right:auto;}
  nav.links.open{
    display:flex;flex-direction:column;position:absolute;top:100%;right:12px;left:auto;min-width:240px;
    background:var(--graphite-0);border:1px solid var(--line);box-shadow:0 12px 32px rgba(0,0,0,.5);padding:18px 24px;gap:16px;z-index:60;
  }
}
@media (max-width: 900px){
  .hero-inner{padding:60px 0 50px;}
  .detail-hero .grid2{grid-template-columns:1fr;gap:36px;}
  .mechanism-row{grid-template-columns:1fr;gap:30px;}
  .product-grid,.values-grid,.legend-strip,.variant-grid,.principle-grid{grid-template-columns:1fr;}
  .feature-list{grid-template-columns:1fr;}
  .video-grid{grid-template-columns:1fr;}
}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:30px;height:24px;background:none;border:none;cursor:pointer;padding:0;
}
.nav-toggle span{display:block;width:100%;height:2px;background:var(--ink);}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{transition:none !important;}
}
:focus-visible{outline:2px solid var(--gas);outline-offset:2px;}

/* ---------- oil/water density experiment ---------- */
.experiment-wrap{display:flex;gap:48px;align-items:flex-start;flex-wrap:wrap;}
.experiment-tube-col{flex:none;}
#oilWaterCanvas{background:var(--graphite-1);border:1px solid var(--line);border-radius:4px;display:block;}
.experiment-side{flex:1;min-width:260px;padding-top:10px;}
.experiment-readout{display:flex;flex-direction:column;gap:10px;margin-bottom:16px;}
.experiment-fluid-row{display:flex;align-items:center;gap:10px;font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--ink);}
.experiment-fluid-row .dot{width:10px;height:10px;border-radius:50%;flex:none;}
@media (max-width: 700px){
  #oilWaterCanvas{width:100%;height:auto;}
}

/* ---------- made in america badge ---------- */
.usa-badge{
  display:inline-flex;align-items:center;gap:10px;
  border:1px solid var(--solids);
  padding:10px 16px;
  margin-bottom:26px;
}
.usa-badge .flag-icon{width:26px;height:auto;flex:none;display:block;}
.usa-badge .usa-text{
  font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:.06em;text-transform:uppercase;
  color:var(--solids);font-weight:500;
}
.usa-badge-footer{
  display:inline-flex;align-items:center;gap:7px;margin-top:6px;
}
.usa-badge-footer .flag-icon{width:17px;height:auto;flex:none;display:block;}
.usa-badge-footer .usa-text{
  font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.05em;text-transform:uppercase;
  color:var(--solids);font-weight:600;
}

/* ---------- range slider (cyclone widget) ---------- */
input[type="range"]{
  -webkit-appearance:none;appearance:none;
  height:4px;border-radius:2px;
  background:var(--graphite-3);
  outline:none;
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:16px;height:16px;border-radius:50%;
  background:var(--fluid);cursor:pointer;
  border:2px solid var(--ink);
}
input[type="range"]::-moz-range-thumb{
  width:16px;height:16px;border-radius:50%;
  background:var(--fluid);cursor:pointer;
  border:2px solid var(--ink);
}

/* header menu button: must come after the base .nav-toggle rule so it can show on narrow screens */
@media (max-width: 1100px){ .nav-toggle{display:flex;} }