/* SyntaxFlow — engineering utilities
   Design system v2. One file, zero dependencies, zero external requests.
   Visual language: glass. Layered translucent planes, refracted light, precise type. */

:root{
  --bg:#06080B;
  --bg-2:#0A0E13;
  --panel:rgba(255,255,255,.035);
  --panel-2:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);
  --text:#EDF2F8;
  --dim:#9AA8B9;
  --faint:#61707F;
  --accent:#5FE3C0;
  --accent-2:#7FB4FF;
  --pass:#46DD86;
  --warn:#FFC24D;
  --fail:#FF7A7A;
  --r:16px; --r-sm:10px;
  --mono:ui-monospace,"SF Mono","Cascadia Mono","JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --maxw:1240px;
  --glow:0 0 0 1px rgba(255,255,255,.05), 0 18px 50px -20px rgba(0,0,0,.85);
}

@media (prefers-color-scheme: light){
  :root{
    --bg:#F4F7FA; --bg-2:#FFFFFF;
    --panel:rgba(255,255,255,.75); --panel-2:rgba(255,255,255,.95);
    --line:rgba(10,22,36,.10); --line-2:rgba(10,22,36,.20);
    --text:#08111C; --dim:#48596B; --faint:#7A8898;
    --accent:#0B8E72; --accent-2:#2563EB;
    --pass:#0E8F48; --warn:#A96206; --fail:#CE2727;
    --glow:0 0 0 1px rgba(10,22,36,.04), 0 18px 44px -24px rgba(10,30,50,.35);
  }
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--sans);font-size:16.5px;line-height:1.62;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
/* refracted light behind everything */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1100px 620px at 78% -14%, rgba(95,227,192,.16), transparent 62%),
    radial-gradient(900px 520px at 4% -6%,  rgba(127,180,255,.14), transparent 60%),
    radial-gradient(700px 700px at 50% 118%, rgba(95,227,192,.07), transparent 62%);
}
/* fine engineering grid */
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.35;
  background-image:
    linear-gradient(rgba(255,255,255,.030) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.030) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 20%, transparent 75%);
}
@media (prefers-color-scheme: light){
  body::after{background-image:
    linear-gradient(rgba(10,22,36,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,22,36,.045) 1px, transparent 1px);}
}

img,svg{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.12;letter-spacing:-.028em;margin:0 0 .5em;font-weight:640}
h1{font-size:clamp(2.3rem,5.2vw,3.7rem)}
h2{font-size:clamp(1.5rem,2.9vw,2.15rem)}
h3{font-size:1.1rem;letter-spacing:-.012em;font-weight:620}
p{margin:0 0 1em}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{padding:62px 0}
.hr{height:1px;border:0;margin:0;
  background:linear-gradient(90deg,transparent,var(--line) 12%,var(--line) 88%,transparent)}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:60;
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
  background:color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:11px;color:var(--text);font-weight:640;
  letter-spacing:-.025em;font-size:1.06rem}
.brand:hover{text-decoration:none}
.brand svg{width:28px;height:28px;flex:0 0 28px}
.nav{margin-left:auto;display:flex;gap:24px;font-size:.94rem}
.nav a{color:var(--dim);position:relative}
.nav a:hover{color:var(--text);text-decoration:none}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:-4px;height:1px;
  background:var(--accent);transition:right .22s ease}
.nav a:hover::after{right:0}

/* ---------- type helpers ---------- */
.eyebrow{
  font-family:var(--mono);font-size:.71rem;letter-spacing:.19em;text-transform:uppercase;
  color:var(--accent);margin:0 0 16px;display:flex;align-items:center;gap:10px;
}
.eyebrow::after{content:"";height:1px;flex:1;max-width:120px;
  background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 55%,transparent),transparent)}
.lead{font-size:1.13rem;color:var(--dim);max-width:64ch}
.balance{text-wrap:balance}

/* ---------- glass panels ---------- */
.card{
  position:relative;border-radius:var(--r);padding:24px;
  background:var(--panel);border:1px solid var(--line);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  box-shadow:var(--glow);
}
.card::before{ /* top light edge */
  content:"";position:absolute;inset:0 0 auto;height:1px;border-radius:var(--r) var(--r) 0 0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.30),transparent);
}
.grid{display:grid;gap:18px}
@media(min-width:780px){ .grid.c2{grid-template-columns:1fr 1fr} .grid.c3{grid-template-columns:repeat(3,1fr)} }

.tool-card{display:block;color:inherit;transition:transform .2s cubic-bezier(.2,.7,.3,1),border-color .2s,box-shadow .2s}
.tool-card:hover{text-decoration:none;transform:translateY(-3px);border-color:var(--line-2);
  box-shadow:0 0 0 1px color-mix(in srgb,var(--accent) 22%,transparent), 0 26px 60px -26px rgba(0,0,0,.9)}
.tool-card h3{margin-bottom:.4em}
.tool-card p{color:var(--dim);font-size:.95rem;margin:0}
.tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--faint);display:inline-block;margin-bottom:12px;
  border:1px solid var(--line);border-radius:99px;padding:2px 9px}
.tool-card.live .tag{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 40%,transparent)}
.soon{opacity:.52}

/* ---------- answer-first ---------- */
.answer{
  position:relative;padding:20px 24px;margin:0 0 26px;border-radius:var(--r-sm);
  background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 11%,transparent),transparent 72%);
  border:1px solid var(--line);border-left:3px solid var(--accent);
}
.answer p{margin:0;font-size:1.06rem}

/* ---------- hero ---------- */
.hero{padding:44px 0 26px}
.hero h1{margin-bottom:.32em}

/* ---------- calculator ---------- */
.calc{
  display:grid;gap:22px;align-items:start;border-radius:var(--r);padding:24px;
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line-2);box-shadow:var(--glow);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  position:relative;overflow:hidden;
}
.calc::before{content:"";position:absolute;inset:0 0 auto;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent)}
@media(min-width:960px){ .calc{grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:30px} }

fieldset{border:0;padding:0;margin:0 0 20px}
legend{font-family:var(--mono);font-size:.69rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--faint);padding:0;margin-bottom:12px}
.field{margin-bottom:14px}
.field label{display:block;font-size:.87rem;color:var(--dim);margin-bottom:6px}
.field .hint{font-size:.77rem;color:var(--faint);margin-top:5px;line-height:1.5}
input[type=number],select{
  width:100%;padding:11px 13px;border-radius:var(--r-sm);
  border:1px solid var(--line-2);background:var(--bg-2);color:var(--text);
  font-family:var(--mono);font-size:1rem;transition:border-color .15s,box-shadow .15s;
}
input[type=number]:hover,select:hover{border-color:var(--line-2)}
input[type=number]:focus,select:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 20%,transparent);
}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.seg{display:flex;border:1px solid var(--line-2);border-radius:var(--r-sm);overflow:hidden;
  background:var(--bg-2)}
.seg button{flex:1;padding:9px 10px;background:transparent;border:0;color:var(--dim);
  font-family:var(--mono);font-size:.8rem;cursor:pointer;letter-spacing:.03em;transition:.16s}
.seg button:hover{color:var(--text)}
.seg button[aria-pressed=true]{
  background:linear-gradient(180deg,var(--accent),color-mix(in srgb,var(--accent) 78%,#000));
  color:#03130F;font-weight:660}

/* ---------- results ---------- */
.results{display:grid;gap:15px}
.verdict{
  display:flex;align-items:center;gap:14px;padding:16px 18px;border-radius:var(--r-sm);
  border:1px solid var(--line-2);background:var(--panel-2);transition:border-color .2s;
}
.verdict .dot{width:12px;height:12px;border-radius:50%;flex:0 0 12px}
.verdict strong{font-size:1.06rem;letter-spacing:-.01em}
.verdict small{display:block;color:var(--dim);font-size:.84rem;line-height:1.45;margin-top:2px}
.verdict.ok{border-color:color-mix(in srgb,var(--pass) 50%,transparent);
  background:linear-gradient(90deg,color-mix(in srgb,var(--pass) 10%,transparent),var(--panel-2) 60%)}
.verdict.ok .dot{background:var(--pass);box-shadow:0 0 14px var(--pass)}
.verdict.no{border-color:color-mix(in srgb,var(--fail) 50%,transparent);
  background:linear-gradient(90deg,color-mix(in srgb,var(--fail) 12%,transparent),var(--panel-2) 60%)}
.verdict.no .dot{background:var(--fail);box-shadow:0 0 14px var(--fail)}

.metrics{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.metric{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-sm);
  padding:15px 17px;position:relative;overflow:hidden}
.metric .k{font-size:.7rem;color:var(--faint);text-transform:uppercase;letter-spacing:.14em;
  font-family:var(--mono)}
.metric .v{font-family:var(--mono);font-size:1.72rem;font-weight:600;letter-spacing:-.035em;
  margin-top:5px;font-variant-numeric:tabular-nums}
.metric .u{font-size:.8rem;color:var(--dim);font-weight:400;letter-spacing:0}
.metric .sub{font-size:.75rem;color:var(--faint);margin-top:3px;font-family:var(--mono)}
.bar{height:4px;border-radius:99px;background:var(--line);margin-top:11px;overflow:hidden}
.bar span{display:block;height:100%;border-radius:99px;width:0;
  transition:width .45s cubic-bezier(.2,.7,.3,1), background .3s}

.note{font-size:.85rem;color:var(--dim);background:var(--panel);
  border:1px solid var(--line);border-left:3px solid var(--warn);
  padding:12px 15px;border-radius:0 var(--r-sm) var(--r-sm) 0;line-height:1.55}
.note.info{border-left-color:var(--accent-2)}
.echo{font-family:var(--mono);font-size:.75rem;color:var(--faint);line-height:1.8;
  border-top:1px dashed var(--line);padding-top:12px}

/* ================= HOME: hero, bands, showcase ================= */
.hero-grid{display:grid;gap:40px;align-items:center;padding:56px 0 30px}
@media(min-width:980px){ .hero-grid{grid-template-columns:1.06fr .94fr;gap:56px;padding:76px 0 44px} }
.hero-grid h1{font-size:clamp(2.6rem,6vw,4.5rem);line-height:1.02;margin-bottom:.3em}
.hero-grid .lead{font-size:clamp(1.06rem,1.5vw,1.25rem);max-width:52ch}
.hl{
  background:linear-gradient(100deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}

.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.cta{
  display:inline-flex;align-items:center;gap:9px;padding:13px 22px;border-radius:99px;
  font-weight:640;font-size:.96rem;letter-spacing:-.01em;transition:.18s;border:1px solid transparent;
}
.cta.solid{background:linear-gradient(180deg,var(--accent),color-mix(in srgb,var(--accent) 76%,#000));color:#03130F}
.cta.solid:hover{text-decoration:none;filter:brightness(1.08);transform:translateY(-1px)}
.cta.ghost{border-color:var(--line-2);color:var(--text)}
.cta.ghost:hover{text-decoration:none;border-color:var(--accent);color:var(--accent)}

/* animated glass plate */
.hero-art{position:relative}
.hero-art svg{width:100%;height:auto;overflow:visible}
@keyframes sweep{ 0%{transform:translateX(-140%)} 55%{transform:translateX(140%)} 100%{transform:translateX(140%)} }
.sweep{animation:sweep 6.5s cubic-bezier(.5,.05,.5,.95) infinite}
@keyframes floaty{ 0%,100%{transform:translateY(0)} 50%{transform:translateY(-7px)} }
.floaty{animation:floaty 7s ease-in-out infinite}
@media (prefers-reduced-motion: reduce){ .sweep,.floaty{animation:none} }

/* stats band */
.stats{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin:8px 0 4px;
}
@media(min-width:760px){ .stats{grid-template-columns:repeat(4,1fr)} }
.stats div{background:var(--bg);padding:22px 20px}
.stats .n{font-family:var(--mono);font-size:1.9rem;font-weight:600;letter-spacing:-.04em;
  background:linear-gradient(180deg,var(--text),var(--dim));-webkit-background-clip:text;
  background-clip:text;color:transparent}
.stats .l{font-size:.8rem;color:var(--faint);text-transform:uppercase;letter-spacing:.12em;margin-top:4px}

/* standards chips */
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}
.chip{
  font-family:var(--mono);font-size:.76rem;letter-spacing:.04em;color:var(--dim);
  border:1px solid var(--line);border-radius:99px;padding:6px 13px;background:var(--panel);
}
.chip b{color:var(--accent);font-weight:600}

/* section head */
.shead{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:26px}
.shead h2{margin:0}
.shead .more{margin-left:auto;font-size:.92rem}

/* ---------- tool card: living diagrams ---------- */
.tool-card{position:relative;overflow:hidden;isolation:isolate}
.tool-card .art{margin:-2px 0 16px;height:92px;display:block}
.tool-card .art svg{height:92px;width:auto;overflow:visible}

/* spotlight that follows the cursor */
.tool-card::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:-1;
  background:radial-gradient(460px circle at var(--mx,50%) var(--my,0%),
             color-mix(in srgb, var(--accent) 15%, transparent), transparent 62%);
  opacity:0;transition:opacity .35s ease;
}
.tool-card:hover::after{opacity:1}

/* the diagrams come alive on hover — each one does what it calculates */
.tool-card .art *{transition:transform .55s cubic-bezier(.25,.85,.35,1), opacity .4s ease}
.tool-card:hover .art .a-defl{transform:translateY(7px) scaleY(1.5)}     /* the pane sags   */
.tool-card:hover .art .a-push{transform:translateX(9px)}                  /* wind pushes     */
.tool-card:hover .art .a-drop{transform:translateY(6px)}                  /* weight drops    */
.tool-card:hover .art .a-heat{transform:translateX(7px);opacity:.45}      /* heat escapes    */
.tool-card:hover .art .a-bend{transform:translateX(9px) rotate(3deg)}     /* barrier bends   */
.tool-card:hover .art .a-pull{transform:translateX(-8px)}                 /* hinge pulls out */
.tool-card:hover .art .a-rise{transform:translateY(-5px)}                 /* sheet lifts     */
.tool-card:hover .art .a-glow{opacity:1}
.tool-card .art .a-glow{opacity:.25}
@media (prefers-reduced-motion: reduce){ .tool-card .art *{transition:none} }

/* a real figure from the tool, so the card shows the product */
.tool-card .ex{
  display:block;margin-top:14px;padding-top:10px;border-top:1px dashed var(--line);
  font-family:var(--mono);font-size:.74rem;color:var(--faint);letter-spacing:.01em;
}
.tool-card .ex b{color:var(--accent);font-weight:600}

/* showcase */
.showcase{display:grid;gap:28px;align-items:center}
@media(min-width:900px){ .showcase{grid-template-columns:1fr 1fr;gap:44px} }
.showcase .formula{margin:0}

/* footer */
.foot-grid{display:grid;gap:22px;margin-bottom:26px}
@media(min-width:760px){ .foot-grid{grid-template-columns:1.4fr 1fr 1fr} }
.foot-grid h4{font-family:var(--mono);font-size:.72rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--faint);margin:0 0 10px;font-weight:500}
.foot-grid a{display:block;margin-bottom:6px;color:var(--dim);font-size:.9rem}
.foot-grid a:hover{color:var(--accent);text-decoration:none}

/* ---------- hand-over to the specification sheet ---------- */
.addspec{
  width:100%;margin-top:4px;padding:12px 16px;border-radius:var(--r-sm);cursor:pointer;
  border:1px dashed var(--line-2);background:transparent;color:var(--dim);
  font:inherit;font-size:.92rem;transition:.16s;
}
.addspec:hover{border-color:var(--accent);color:var(--accent);border-style:solid}
.addspec.done{border-style:solid;border-color:var(--pass);color:var(--pass)}
.addspec.fail{border-style:solid;border-color:var(--fail);color:var(--fail)}
.addspec-link{display:block;text-align:center;font-size:.82rem;color:var(--faint);margin-top:-4px}
.addspec-link:hover{color:var(--accent)}

/* ---------- diagram ---------- */
.diagram{background:linear-gradient(160deg,var(--bg-2),color-mix(in srgb,var(--bg-2) 80%, var(--accent) 4%));
  border:1px solid var(--line);border-radius:var(--r-sm);padding:8px}
.diagram text{font-family:var(--mono);font-size:11px;fill:var(--faint)}

/* ---------- prose ---------- */
.prose{max-width:76ch}
.prose h2{margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.15em;color:var(--dim)}
.prose li{margin-bottom:.45em}
.formula{font-family:var(--mono);font-size:.93rem;line-height:1.75;
  background:var(--bg-2);border:1px solid var(--line);border-left:3px solid var(--accent-2);
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:16px 18px;margin:16px 0;
  overflow-x:auto;color:var(--text);white-space:pre}
.formula .c{color:var(--faint)}
table{width:100%;border-collapse:collapse;font-size:.89rem;margin:16px 0;display:block;overflow-x:auto}
th,td{text-align:left;padding:9px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-family:var(--mono);font-size:.71rem;text-transform:uppercase;letter-spacing:.11em;
  color:var(--faint);font-weight:500}
td.num{font-family:var(--mono);font-variant-numeric:tabular-nums}
details{border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 18px;margin:16px 0;
  background:var(--panel)}
summary{cursor:pointer;font-weight:620;font-size:.96rem}
details[open] summary{margin-bottom:12px}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);padding:38px 0 52px;margin-top:48px;
  color:var(--faint);font-size:.88rem}
.site-foot a{color:var(--dim)}
.disclaimer{border:1px solid var(--line);border-left:3px solid var(--faint);
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:14px 18px;font-size:.85rem;
  color:var(--dim);margin:28px 0 0;line-height:1.6}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}