:root{
    --abyss:#060912;
    --deep:#0A0F1E;
    --twilight:#0C1426;
    --surface:#102036;
    --glow:#3FE0C5;
    --glow-dim:#2779A7;
    --ink:#E8EEF4;
    --muted:#7E8CA0;
    --line:rgba(127,140,160,.18);
    --bg:var(--deep);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:"Satoshi",system-ui,sans-serif;
    background:var(--bg);
    color:var(--ink);
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
    transition:background .6s linear;
  }
  ::selection{background:var(--glow);color:var(--abyss)}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:1180px;margin:0 auto;padding:0 28px}
  .mono{font-family:"IBM Plex Mono",monospace;font-weight:400}
  .eyebrow{
    font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.32em;
    text-transform:uppercase;color:var(--glow);display:inline-flex;gap:10px;align-items:center;
  }
  .eyebrow::before{content:"";width:26px;height:1px;background:var(--glow);opacity:.7}

  /* ---------- nav ---------- */
  header{position:fixed;top:0;left:0;right:0;z-index:60;
    backdrop-filter:blur(8px);background:linear-gradient(to bottom,rgba(6,9,18,.7),transparent);}
  nav{display:flex;align-items:center;justify-content:space-between;height:74px}
  .brand{display:flex;align-items:center;gap:11px;font-family:"Clash Display";font-weight:600;font-size:19px;letter-spacing:.01em}
  .mark{width:22px;height:22px;position:relative;flex:0 0 auto}
  .mark span{position:absolute;inset:0;border:1.5px solid var(--glow);border-radius:50%;opacity:.9}
  .mark span:nth-child(2){inset:5px;opacity:.55}
  .mark span:nth-child(3){inset:9.5px;background:var(--glow);border:none;opacity:1;box-shadow:0 0 12px var(--glow)}
  .navlinks{display:flex;gap:34px;font-size:14.5px;color:var(--muted)}
  .navlinks a{transition:color .2s}
  .navlinks a:hover{color:var(--ink)}
  .nav-cta{font-size:14px;border:1px solid var(--line);padding:9px 18px;border-radius:40px;color:var(--ink);transition:.25s}
  .nav-cta:hover{border-color:var(--glow);color:var(--glow)}
  @media(max-width:780px){.navlinks{display:none}}

  /* ---------- depth gauge ---------- */
  .gauge{position:fixed;right:26px;top:50%;transform:translateY(-50%);z-index:55;
    width:64px;text-align:center;pointer-events:none;mix-blend-mode:normal}
  .gauge .lab{font-family:"IBM Plex Mono",monospace;font-size:9.5px;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}
  .gauge .val{font-family:"IBM Plex Mono",monospace;font-size:17px;color:var(--glow);margin:3px 0 2px;font-weight:500}
  .gauge .unit{font-family:"IBM Plex Mono",monospace;font-size:10px;color:var(--muted)}
  .gauge .track{width:2px;height:190px;background:var(--line);margin:12px auto;position:relative;border-radius:2px}
  .gauge .fill{position:absolute;top:0;left:0;width:100%;background:linear-gradient(var(--glow),var(--glow-dim));border-radius:2px;height:0%}
  .gauge .dot{position:absolute;left:50%;transform:translate(-50%,-50%);width:7px;height:7px;border-radius:50%;
    background:var(--glow);box-shadow:0 0 10px var(--glow);top:0%}
  .gauge .zone{font-family:"IBM Plex Mono",monospace;font-size:9.5px;letter-spacing:.12em;color:var(--ink);text-transform:uppercase;writing-mode:vertical-rl;margin:8px auto 0;height:auto}
  @media(max-width:900px){.gauge{display:none}}

  /* marine snow */
  .snow{position:fixed;inset:0;z-index:1;pointer-events:none;overflow:hidden}
  .snow i{position:absolute;top:-10px;width:2px;height:2px;background:rgba(232,238,244,.5);border-radius:50%;
    animation:fall linear infinite}
  @keyframes fall{to{transform:translateY(108vh)}}

  section{position:relative;z-index:2}

  /* ---------- hero ---------- */
  .hero{min-height:100vh;display:flex;align-items:center;padding:120px 0 80px;position:relative}
  .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
  .hero h1{font-family:"Clash Display";font-weight:600;font-size:clamp(40px,6.4vw,82px);line-height:1.02;letter-spacing:-.01em}
  .hero h1 em{font-style:normal;color:var(--glow);text-shadow:0 0 30px rgba(63,224,197,.35)}
  .hero p.lead{font-size:clamp(16px,1.5vw,19px);color:var(--muted);max-width:46ch;margin:26px 0 34px}
  .cta-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
  .btn{font-family:"Satoshi";font-weight:700;font-size:15px;padding:15px 26px;border-radius:46px;
    background:var(--glow);color:var(--abyss);transition:.25s;box-shadow:0 0 0 rgba(63,224,197,0)}
  .btn:hover{box-shadow:0 0 34px rgba(63,224,197,.45);transform:translateY(-2px)}
  .btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
  .btn.ghost:hover{border-color:var(--glow);color:var(--glow);box-shadow:none}
  .sonar{position:relative;aspect-ratio:1;max-width:340px;margin-left:auto;border-radius:50%;
    border:1px solid var(--line);display:grid;place-items:center}
  .sonar::before,.sonar::after{content:"";position:absolute;inset:0;border-radius:50%;border:1px solid var(--glow);opacity:0;animation:ping 4s ease-out infinite}
  .sonar::after{animation-delay:2s}
  @keyframes ping{0%{transform:scale(.35);opacity:.7}100%{transform:scale(1);opacity:0}}
  .sonar .core{text-align:center}
  .sonar .core .big{font-family:"IBM Plex Mono",monospace;font-size:42px;color:var(--glow);font-weight:500}
  .sonar .core .sub{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase}
  @media(max-width:860px){.hero-grid{grid-template-columns:1fr}.sonar{display:none}}

  /* ---------- generic section ---------- */
  .band{padding:110px 0;border-top:1px solid var(--line)}
  .band h2{font-family:"Clash Display";font-weight:600;font-size:clamp(28px,3.6vw,46px);line-height:1.08;letter-spacing:-.01em;margin:18px 0 0;max-width:18ch}
  .lead2{color:var(--muted);font-size:17px;max-width:54ch;margin-top:20px}

  /* problem stats */
  .stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);margin-top:54px;border:1px solid var(--line)}
  .stat{background:var(--bg);padding:34px 28px;transition:background .6s linear}
  .stat .n{font-family:"Clash Display";font-weight:600;font-size:46px;color:var(--ink);line-height:1}
  .stat .n b{color:var(--glow);font-weight:600}
  .stat .t{color:var(--muted);font-size:14.5px;margin-top:12px;max-width:30ch}
  @media(max-width:760px){.stats{grid-template-columns:1fr}}

  /* descent / process */
  .steps{margin-top:54px;display:flex;flex-direction:column;gap:0}
  .step{display:grid;grid-template-columns:90px 1fr auto;gap:26px;align-items:baseline;padding:30px 0;border-top:1px solid var(--line)}
  .step:last-child{border-bottom:1px solid var(--line)}
  .step .idx{font-family:"IBM Plex Mono",monospace;color:var(--glow);font-size:14px}
  .step h3{font-family:"Clash Display";font-weight:600;font-size:23px}
  .step p{color:var(--muted);font-size:15px;margin-top:8px;max-width:52ch}
  .step .d{font-family:"IBM Plex Mono",monospace;color:var(--muted);font-size:12.5px;white-space:nowrap}
  @media(max-width:680px){.step{grid-template-columns:54px 1fr}.step .d{display:none}}

  /* practices */
  .dives{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:54px}
  .dive{border:1px solid var(--line);border-radius:14px;padding:28px;position:relative;overflow:hidden;
    transition:.3s;background:linear-gradient(180deg,rgba(63,224,197,0),rgba(63,224,197,0))}
  .dive:hover{border-color:rgba(63,224,197,.5);transform:translateY(-3px);
    background:linear-gradient(180deg,rgba(63,224,197,.06),rgba(63,224,197,0))}
  .dive .pd{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--glow);letter-spacing:.12em}
  .dive h3{font-family:"Clash Display";font-weight:600;font-size:26px;margin:14px 0 8px}
  .dive p{color:var(--muted);font-size:14.5px;max-width:40ch}
  .dive .go{margin-top:18px;font-size:13.5px;color:var(--ink);display:inline-flex;gap:8px;align-items:center;opacity:.0;transition:.3s}
  .dive:hover .go{opacity:1}
  .dive .go b{color:var(--glow)}
  @media(max-width:680px){.dives{grid-template-columns:1fr}}

  /* proof */
  .proof{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:54px}
  .pc{border-left:2px solid var(--glow);padding:6px 0 6px 22px}
  .pc .n{font-family:"Clash Display";font-weight:600;font-size:40px;color:var(--ink)}
  .pc .t{color:var(--muted);font-size:14.5px;margin-top:8px}
  .pc .src{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--glow);margin-top:14px;letter-spacing:.08em}
  @media(max-width:760px){.proof{grid-template-columns:1fr;gap:30px}}

  /* contact */
  .surface{padding:120px 0;text-align:center;border-top:1px solid var(--line)}
  .surface h2{font-family:"Clash Display";font-weight:600;font-size:clamp(30px,4.4vw,56px);line-height:1.05;max-width:20ch;margin:18px auto 0}
  .surface p{color:var(--muted);font-size:17px;max-width:48ch;margin:22px auto 34px}

  footer{border-top:1px solid var(--line);padding:40px 0;color:var(--muted);font-size:13.5px}
  .frow{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
  .frow .mono{font-size:12px}

  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
  .reveal.in{opacity:1;transform:none}
  @media(prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    .reveal{opacity:1;transform:none}
    html{scroll-behavior:auto}
  }

/* ---------- practice (dive site) pages ---------- */
.pp-hero{min-height:78vh;display:flex;align-items:center;padding:140px 0 70px}
.pp-hero .tag{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.28em;color:var(--glow);text-transform:uppercase}
.pp-hero h1{font-family:"Clash Display";font-weight:600;font-size:clamp(38px,6vw,76px);line-height:1.03;letter-spacing:-.01em;margin:20px 0 0;max-width:16ch}
.pp-hero h1 em{font-style:normal;color:var(--glow);text-shadow:0 0 30px rgba(63,224,197,.35)}
.pp-hero .lead{font-size:clamp(16px,1.5vw,19px);color:var(--muted);max-width:50ch;margin:26px 0 34px}
.crumbs{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted);margin-bottom:8px;letter-spacing:.08em}
.crumbs a:hover{color:var(--glow)}
.svc{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);margin-top:54px;border:1px solid var(--line)}
.svc .item{background:var(--bg);padding:30px 28px;transition:background .6s linear}
.svc .item .k{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--glow);letter-spacing:.1em}
.svc .item h3{font-family:"Clash Display";font-weight:600;font-size:21px;margin:12px 0 8px}
.svc .item p{color:var(--muted);font-size:14.5px;max-width:42ch}
@media(max-width:680px){.svc{grid-template-columns:1fr}}
.divenav{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.divenav a{font-family:"IBM Plex Mono",monospace;font-size:13px;border:1px solid var(--line);padding:9px 16px;border-radius:40px;color:var(--muted);transition:.25s}
.divenav a:hover{border-color:var(--glow);color:var(--glow)}
.divenav a[aria-current]{border-color:var(--glow);color:var(--glow)}

/* ---------- dive form ---------- */
.dform{max-width:580px;margin:38px auto 0;text-align:left}
.dform .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.frow2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.dform label{display:block;font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.dform input,.dform select,.dform textarea{
  width:100%;margin-top:8px;background:rgba(232,238,244,.03);border:1px solid var(--line);
  border-radius:9px;padding:13px 14px;color:var(--ink);font-family:"Satoshi",sans-serif;font-size:15px;
  letter-spacing:normal;text-transform:none;transition:border-color .2s,box-shadow .2s}
.dform select{cursor:pointer;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 19px,calc(100% - 13px) 19px;background-size:5px 5px,5px 5px;background-repeat:no-repeat}
.dform textarea{resize:vertical;min-height:90px}
.dform input:focus,.dform select:focus,.dform textarea:focus{outline:none;border-color:var(--glow);box-shadow:0 0 0 3px rgba(63,224,197,.12)}
.dform button{margin-top:6px;border:none;cursor:pointer;width:auto}
.dform .fmsg{font-family:"IBM Plex Mono",monospace;font-size:13px;margin-top:16px;min-height:18px;letter-spacing:.02em}
.dform .fmsg.ok{color:var(--glow)}
.dform .fmsg.err{color:#ff8b7a}
@media(max-width:560px){.frow2{grid-template-columns:1fr}}