/* ============================================================
   PetaOTDR landing — "field instrument" identity
   ============================================================ */
:root{
  --bg:#0A1418;
  --bg-2:#0D1B22;
  --surface:#101F27;
  --surface-2:#13252E;
  --line:#1B333C;
  --line-2:#244550;
  --cyan:#35E7C9;      /* the trace / light in fiber */
  --cyan-dim:#1f8f7e;
  --amber:#FFAD5B;     /* reflective events / warmth */
  --text:#EAF4F3;
  --muted:#7C9AA3;
  --muted-2:#5C7982;
  --pass:#35E7C9;
  --fail:#FF6B6B;
  --shadow:0 24px 60px -30px rgba(0,0,0,.8);
  --radius:14px;
  --maxw:1180px;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --disp:"Space Grotesk",system-ui,sans-serif;
  --body:"Inter",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--body);font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
/* subtle grid texture on the page bg */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;opacity:.16;
  mask-image:radial-gradient(ellipse 90% 60% at 70% 0%,#000 25%,transparent 75%);
}
main,.nav,.footer{position:relative;z-index:1}
a{color:inherit;text-decoration:none}
code{font-family:var(--mono);font-size:.85em;background:var(--surface-2);border:1px solid var(--line);padding:.08em .4em;border-radius:5px;color:var(--cyan)}
.skip{position:absolute;left:-999px;top:0;background:var(--cyan);color:#04120e;padding:.6rem 1rem;z-index:99}
.skip:focus{left:1rem;top:1rem}

.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);margin:0 0 1.1rem}
.hl{color:var(--cyan)}
.hl-amber{color:var(--amber)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-family:var(--mono);font-weight:500;font-size:.82rem;letter-spacing:.03em;
  padding:.72rem 1.25rem;border-radius:9px;border:1px solid transparent;
  cursor:pointer;transition:transform .15s ease,background .2s,border-color .2s,box-shadow .2s;
  white-space:nowrap;
}
.btn-lg{padding:.95rem 1.7rem;font-size:.9rem}
.btn-block{display:flex;width:100%}
.btn-solid{background:var(--cyan);color:#04120e;font-weight:600;box-shadow:0 8px 30px -12px var(--cyan-dim)}
.btn-solid:hover{transform:translateY(-2px);box-shadow:0 14px 40px -14px var(--cyan-dim)}
.btn-ghost{border-color:var(--line-2);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

/* ---------- nav ---------- */
.nav{
  display:flex;align-items:center;gap:2rem;
  max-width:var(--maxw);margin:0 auto;padding:1.1rem 1.5rem;
  position:sticky;top:0;backdrop-filter:blur(12px);
  background:linear-gradient(var(--bg),rgba(10,20,24,.6));
  border-bottom:1px solid transparent;transition:border-color .3s;
}
.nav.scrolled{border-color:var(--line)}
.brand{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--disp);font-weight:500;font-size:1.15rem;letter-spacing:-.01em}
.brand b{font-weight:700}
.brand-mark{width:38px;height:23px;fill:none;stroke:var(--cyan);stroke-width:1.8;stroke-linejoin:round;stroke-linecap:round;filter:drop-shadow(0 0 6px rgba(53,231,201,.5))}
.nav-links{display:flex;gap:1.6rem;margin-left:auto;font-size:.92rem}
.nav-links a{color:var(--muted);transition:color .2s}
.nav-links a:hover{color:var(--text)}
.nav-cta{display:flex;gap:.7rem}

/* ---------- hero ---------- */
.hero{
  max-width:var(--maxw);margin:0 auto;padding:4.5rem 1.5rem 3rem;
  display:grid;grid-template-columns:1fr 1.05fr;gap:3.5rem;align-items:center;
}
.hero h1{
  font-family:var(--disp);font-weight:700;font-size:clamp(2.3rem,4.6vw,3.7rem);
  line-height:1.04;letter-spacing:-.025em;margin:0 0 1.3rem;
}
.lede{font-size:1.08rem;color:var(--muted);max-width:38ch;margin:0 0 2rem}
.hero-actions{display:flex;gap:.9rem;flex-wrap:wrap;margin-bottom:1.8rem}
.hero-trust{list-style:none;display:flex;flex-wrap:wrap;gap:1.3rem;padding:0;margin:0;font-size:.86rem;color:var(--muted)}
.hero-trust span{color:var(--cyan);font-weight:700;margin-right:.35rem}

/* scope = signature */
.scope{
  margin:0;border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(160deg,#0c1a20,#0a1519);box-shadow:var(--shadow);
}
.scope-bar{display:flex;align-items:center;gap:.5rem;padding:.7rem 1rem;background:var(--surface);border-bottom:1px solid var(--line)}
.scope-bar .dot{width:9px;height:9px;border-radius:50%;background:var(--line-2)}
.scope-title{margin-left:.6rem;font-family:var(--mono);font-size:.72rem;color:var(--muted);letter-spacing:.04em}
.scope-body{position:relative}
#trace{display:block;width:100%;height:auto}
.hud{
  position:absolute;top:.9rem;left:.9rem;background:rgba(6,15,18,.72);backdrop-filter:blur(4px);
  border:1px solid var(--line);border-radius:9px;padding:.6rem .8rem;font-family:var(--mono);font-size:.72rem;
}
.hud-row{display:grid;grid-template-columns:1.2rem 5.2rem 1fr;gap:.5rem;align-items:baseline;color:var(--muted)}
.hud-row span{color:var(--cyan);font-weight:600}
.hud-row b{color:var(--text);font-weight:500}
.hud-row i{font-style:normal;color:var(--muted)}
.hud-delta span{color:var(--amber)}
.hud-delta b,.hud-delta i{color:var(--amber)}
.verdict{
  position:absolute;bottom:.9rem;right:.9rem;font-family:var(--mono);font-weight:600;font-size:.78rem;
  letter-spacing:.08em;padding:.35rem .9rem;border-radius:7px;background:rgba(53,231,201,.14);
  color:var(--pass);border:1px solid rgba(53,231,201,.4);opacity:0;transform:translateY(6px);transition:.5s .3s;
}
.verdict.show{opacity:1;transform:none}

/* ---------- spec strip ---------- */
.specs{
  max-width:var(--maxw);margin:1rem auto 0;padding:0 1.5rem;
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
}
.spec{background:var(--bg-2);padding:1.4rem 1.5rem;text-align:center}
.spec b{display:block;font-family:var(--disp);font-weight:600;font-size:1.35rem;color:var(--text)}
.spec span{font-size:.8rem;color:var(--muted)}

/* ---------- sections ---------- */
.section{max-width:var(--maxw);margin:0 auto;padding:6rem 1.5rem}
.sec-head{max-width:640px;margin:0 0 3rem}
.sec-head h2{font-family:var(--disp);font-weight:700;font-size:clamp(1.7rem,3vw,2.5rem);line-height:1.1;letter-spacing:-.02em;margin:0 0 .8rem}
.sec-sub{color:var(--muted);font-size:1.05rem;margin:0}

/* feature grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
.card{
  position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.7rem;transition:border-color .25s,transform .25s,background .25s;
}
.card::after{content:"";position:absolute;top:10px;right:10px;width:10px;height:10px;border-top:1.5px solid var(--line-2);border-right:1.5px solid var(--line-2);opacity:.7}
.card:hover{border-color:var(--line-2);transform:translateY(-4px);background:var(--surface-2)}
.card-wide{grid-column:span 2;display:flex;flex-direction:column}
.tag{font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;color:var(--cyan);background:rgba(53,231,201,.08);border:1px solid rgba(53,231,201,.22);padding:.2rem .55rem;border-radius:5px}
.card h3{font-family:var(--disp);font-weight:600;font-size:1.22rem;margin:1rem 0 .5rem;letter-spacing:-.01em}
.card p{color:var(--muted);font-size:.94rem;margin:0}
.card b{color:var(--text);font-weight:600}
.pass-inline{color:var(--pass)}.fail-inline{color:var(--fail)}
.mini-scope{margin-top:auto;padding-top:1.3rem}
#trace2{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:9px;background:#0a1519}

/* why / compare */
.why{padding-top:2rem}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
.col-them,.col-us{border-radius:var(--radius);padding:2rem;border:1px solid var(--line)}
.col-them{background:var(--bg-2)}
.col-us{background:linear-gradient(160deg,rgba(53,231,201,.07),var(--surface));border-color:rgba(53,231,201,.28)}
.col-label{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;margin:0 0 1.2rem}
.col-them .col-label{color:var(--muted)}
.col-us .col-label{color:var(--cyan)}
.compare ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.85rem}
.compare li{padding-left:1.7rem;position:relative;font-size:.96rem;color:var(--muted)}
.col-them li::before{content:"—";position:absolute;left:0;color:var(--muted-2)}
.col-us li::before{content:"✓";position:absolute;left:0;color:var(--cyan);font-weight:700}
.col-us li b{color:var(--text)}

/* steps */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;counter-reset:s}
.flow li{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;position:relative}
.step-no{font-family:var(--mono);font-size:.8rem;color:var(--amber);letter-spacing:.1em}
.flow h3{font-family:var(--disp);font-weight:600;font-size:1.08rem;margin:.7rem 0 .4rem}
.flow p{color:var(--muted);font-size:.9rem;margin:0}
.mid{color:var(--amber)!important;font-size:.82em;white-space:nowrap}

/* pricing */
.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem;align-items:stretch}
.tier{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:2rem;display:flex;flex-direction:column}
.tier-hi{background:linear-gradient(170deg,rgba(53,231,201,.1),var(--surface));border-color:var(--cyan);position:relative;box-shadow:0 20px 50px -30px var(--cyan-dim)}
.tier-badge{position:absolute;top:-.75rem;left:2rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;background:var(--cyan);color:#04120e;padding:.3rem .7rem;border-radius:6px;font-weight:600}
.tier-name{font-family:var(--mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 .8rem}
.tier-price{font-family:var(--disp);font-weight:700;font-size:2.6rem;line-height:1;margin:0 0 .3rem;letter-spacing:-.03em}
.tier-price .cur{font-size:1.1rem;color:var(--muted);font-weight:500;margin-right:.15rem;vertical-align:.5rem}
.tier-price .k{font-size:1.5rem}
.tier-price .per{font-family:var(--mono);font-size:.9rem;color:var(--muted);font-weight:500;margin-left:.25rem;letter-spacing:0}
.tier-desc{color:var(--muted);font-size:.9rem;margin:0 0 1.4rem;min-height:2.5em}
.tier-list{list-style:none;margin:0 0 1.6rem;padding:0;display:flex;flex-direction:column;gap:.7rem;font-size:.92rem;color:var(--muted);flex:1}
.tier-list li{padding-left:1.5rem;position:relative}
.tier-list li::before{content:"✓";position:absolute;left:0;color:var(--cyan)}

/* final cta */
.cta-final{max-width:var(--maxw);margin:2rem auto;padding:0 1.5rem}
.cta-inner{
  background:radial-gradient(120% 140% at 50% 0%,rgba(53,231,201,.1),var(--surface));
  border:1px solid var(--line-2);border-radius:20px;padding:4rem 2rem;text-align:center;
}
.cta-inner h2{font-family:var(--disp);font-weight:700;font-size:clamp(1.8rem,3.4vw,2.7rem);letter-spacing:-.02em;margin:0 0 .8rem}
.cta-inner>p{color:var(--muted);max-width:46ch;margin:0 auto 2rem}
.cta-inner .hero-actions{justify-content:center}
.cta-note{font-family:var(--mono);font-size:.76rem;color:var(--muted-2);margin-top:1.4rem}

/* faq */
.faq-list{display:flex;flex-direction:column;gap:.7rem;max-width:820px}
.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:0 1.4rem;transition:border-color .2s}
.faq-list details[open]{border-color:var(--line-2)}
.faq-list summary{cursor:pointer;list-style:none;padding:1.15rem 0;font-family:var(--disp);font-weight:500;font-size:1.02rem;display:flex;justify-content:space-between;align-items:center}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-family:var(--mono);color:var(--cyan);font-size:1.3rem;transition:transform .2s}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list p{color:var(--muted);margin:0 0 1.2rem;font-size:.95rem}

/* footer */
.footer{
  max-width:var(--maxw);margin:3rem auto 0;padding:3.5rem 1.5rem 2.5rem;
  border-top:1px solid var(--line);display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;
}
.foot-brand p{color:var(--muted);font-size:.9rem;max-width:34ch;margin:1rem 0 0}
.foot-col{display:flex;flex-direction:column;gap:.6rem}
.foot-h{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);margin:0 0 .3rem}
.foot-col a{color:var(--muted);font-size:.92rem;transition:color .2s}
.foot-col a:hover{color:var(--cyan)}
.foot-legal{grid-column:1/-1;margin:2.5rem 0 0;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.78rem;color:var(--muted-2)}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:920px){
  .hero{grid-template-columns:1fr;gap:2.5rem;padding-top:3rem}
  .grid,.tiers,.flow,.compare{grid-template-columns:1fr}
  .card-wide{grid-column:span 1}
  .specs{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .footer{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .nav-cta .btn-ghost{display:none}
  .specs{grid-template-columns:1fr}
  .footer{grid-template-columns:1fr}
  .hud{transform:scale(.82);transform-origin:top left}
  .section{padding:4rem 1.3rem}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none;transition:none}
}