:root{--ink-0:#070503;--ink-1:#0C0906;--ink-2:#131009;--ink-3:#1C1710;--ink-4:#251E15;--red:#C8401A;--red-hi:#E05530;--cream:#F0EBE3;--fog:#6B6058;--fog-hi:#9A8E82;--line:rgba(255,255,255,0.055);--line-red:rgba(200,64,26,0.25);}
    *,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
    html{scroll-behavior:smooth;}
    body{background:var(--ink-1);color:var(--cream);font-family:'DM Sans',sans-serif;font-weight:300;line-height:1.7;overflow-x:hidden;}

    /* NAV */
    nav{position:fixed;top:0;left:0;right:0;z-index:500;display:flex;align-items:center;justify-content:space-between;padding:2rem 3.5rem;transition:background .5s,padding .4s;}
    nav.scrolled{background:rgba(7,5,3,.95);backdrop-filter:blur(20px);border-bottom:1px solid var(--line);padding:1.35rem 3.5rem;}
    .logo{font-family:'DM Sans',sans-serif;font-weight:700;font-size:1rem;letter-spacing:.18em;text-transform:uppercase;color:var(--cream);text-decoration:none;}
    .logo span{color:var(--red);}
    .nav-links{display:flex;gap:2.75rem;list-style:none;}
    .nav-links a{font-size:.7rem;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--fog-hi);text-decoration:none;transition:color .2s;position:relative;}
    .nav-links a::after{content:'';position:absolute;bottom:-3px;left:0;width:0;height:1px;background:var(--red);transition:width .3s;}
    .nav-links a:hover,.nav-links a.active{color:var(--cream);}
    .nav-links a:hover::after,.nav-links a.active::after{width:100%;}
    .nav-cta{font-size:.65rem;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--ink-0);background:var(--cream);padding:.65rem 1.5rem;text-decoration:none;transition:background .2s,color .2s;}
    .nav-cta:hover{background:var(--red);color:var(--cream);}

    /* MOBILE NAV */
    .hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;background:none;border:none;z-index:600;position:relative;}
    .hamburger span{display:block;width:24px;height:1.5px;background:var(--cream);transition:transform .3s,opacity .3s;}
    .hamburger.open span:nth-child(1){transform:translateY(6.5px) rotate(45deg);}
    .hamburger.open span:nth-child(2){opacity:0;}
    .hamburger.open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg);}
    .mobile-menu{position:fixed;inset:0;background:var(--ink-0);z-index:550;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:2.5rem;opacity:0;pointer-events:none;transition:opacity .35s ease;}
    .mobile-menu.open{opacity:1;pointer-events:all;}
    .mobile-menu a{font-family:'Cormorant',serif;font-size:clamp(2.5rem,8vw,3.5rem);font-weight:300;color:var(--cream);text-decoration:none;letter-spacing:.05em;transition:color .2s;}
    .mobile-menu a:hover,.mobile-menu a.active{color:var(--red);}
    .mobile-menu .menu-cta{font-family:'DM Sans',sans-serif;font-size:.75rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-0);background:var(--red);padding:.9rem 2.5rem;margin-top:1rem;}
    @media(max-width:768px){
      .hamburger{display:flex !important;}
      .nav-links{display:none !important;}
      .nav-cta{display:none !important;}
    }

    /* SIGNAL HERO */
    .signal-hero{min-height:75vh;display:flex;flex-direction:column;justify-content:flex-end;position:relative;overflow:hidden;border-bottom:1px solid var(--line);}
    .signal-hero-bg{position:absolute;inset:0;background:#080402;overflow:hidden;}
    .river-blob{position:absolute;border-radius:50%;filter:blur(55px);will-change:transform;}
    .rb1{width:90%;height:45%;background:radial-gradient(ellipse,rgba(140,52,8,0.9) 0%,rgba(100,30,4,0.4) 50%,transparent 75%);top:15%;left:-20%;animation:rflow1 14s ease-in-out infinite alternate;}
    .rb2{width:80%;height:40%;background:radial-gradient(ellipse,rgba(100,35,6,0.85) 0%,rgba(70,20,3,0.35) 55%,transparent 75%);top:40%;left:5%;animation:rflow2 18s ease-in-out infinite alternate;}
    .rb3{width:70%;height:38%;background:radial-gradient(ellipse,rgba(160,60,10,0.75) 0%,rgba(120,40,6,0.3) 50%,transparent 75%);top:10%;left:25%;animation:rflow3 12s ease-in-out infinite alternate;}
    .rb4{width:85%;height:35%;background:radial-gradient(ellipse,rgba(80,25,4,0.9) 0%,rgba(55,15,2,0.4) 55%,transparent 75%);top:50%;left:0%;animation:rflow4 20s ease-in-out infinite alternate;}
    .rb5{width:65%;height:30%;background:radial-gradient(ellipse,rgba(175,65,12,0.65) 0%,rgba(130,45,8,0.25) 50%,transparent 75%);top:30%;left:40%;animation:rflow5 16s ease-in-out infinite alternate;}
    .river-mist{position:absolute;left:0;right:0;height:120px;filter:blur(18px);}
    .rm1{top:45%;background:linear-gradient(to right,transparent,rgba(90,35,8,0.5),transparent,rgba(70,25,5,0.35),transparent);animation:rmist 18s ease-in-out infinite alternate;opacity:.18;}
    .rm2{top:68%;background:linear-gradient(to right,rgba(60,20,5,0.35),transparent,rgba(80,30,6,0.45),transparent);animation:rmist 24s ease-in-out infinite alternate-reverse;opacity:.15;}
    .river-ripples{position:absolute;inset:0;width:100%;height:100%;opacity:.35;}
    @keyframes rflow1{0%{transform:translate(0,0) scaleX(1)}50%{transform:translate(45%,18%) scaleX(1.15)}100%{transform:translate(75%,30%) scaleX(0.9)}}
    @keyframes rflow2{0%{transform:translate(0,0) scaleX(1)}40%{transform:translate(35%,12%) scaleX(1.2)}100%{transform:translate(65%,28%) scaleX(1.05)}}
    @keyframes rflow3{0%{transform:translate(0,0)}60%{transform:translate(40%,20%) scaleX(0.95)}100%{transform:translate(55%,35%) scaleX(1.1)}}
    @keyframes rflow4{0%{transform:translate(0,0) scaleX(1)}45%{transform:translate(40%,10%) scaleX(1.15)}100%{transform:translate(70%,22%) scaleX(0.85)}}
    @keyframes rflow5{0%{transform:translate(0,0)}55%{transform:translate(20%,15%) scaleX(1.1)}100%{transform:translate(45%,28%) scaleX(0.95)}}
    @keyframes rmist{0%{transform:translateX(-15%);opacity:.12}50%{opacity:.22}100%{transform:translateX(15%);opacity:.15}}
    /* swap in: <video class="signal-video" autoplay muted loop playsinline src="signal-01.mp4"></video> */
    .signal-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0.45;}
    .signal-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,transparent 0%,rgba(7,5,3,.3) 50%,rgba(7,5,3,.92) 88%,var(--ink-1) 100%);}
    .signal-hero-inner{position:relative;z-index:2;padding:0 3.5rem 5rem;max-width:900px;}
    .signal-back{display:inline-flex;align-items:center;gap:.5rem;font-size:.65rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--fog-hi);text-decoration:none;margin-bottom:3rem;transition:color .2s,gap .2s;}
    .signal-back:hover{color:var(--red);gap:.8rem;}
    .signal-meta{display:flex;align-items:center;gap:1.5rem;margin-bottom:2rem;}
    .signal-tag{font-size:.65rem;font-weight:600;letter-spacing:.25em;text-transform:uppercase;color:var(--red);}
    .signal-divider{width:1px;height:12px;background:var(--fog);opacity:.4;}
    .signal-read{font-size:.65rem;letter-spacing:.15em;text-transform:uppercase;color:var(--fog-hi);}
    .signal-hero h1{font-family:'Cormorant',serif;font-weight:300;font-size:clamp(2.5rem,5vw,6rem);line-height:1.05;letter-spacing:-.015em;}
    .signal-hero h1 em{font-style:italic;color:var(--red);}

    /* SIGNAL BODY */
    .signal-body{max-width:720px;margin:0 auto;padding:6rem 3.5rem 5rem;}
    .signal-intro{font-family:'Cormorant',serif;font-size:clamp(1.25rem,2vw,1.6rem);font-weight:300;line-height:1.55;color:var(--cream);margin-bottom:1.5rem;padding-bottom:0;}
    .signal-intro:last-of-type{margin-bottom:3rem;padding-bottom:3rem;border-bottom:1px solid var(--line);}
    .signal-section{margin-bottom:3.5rem;}
    .signal-section h2{font-family:'Cormorant',serif;font-size:clamp(1.5rem,2.5vw,2.25rem);font-weight:300;line-height:1.2;margin-bottom:1.5rem;}
    .signal-section h2 em{font-style:italic;color:var(--red);}
    .signal-section p{font-size:1rem;color:var(--fog-hi);line-height:1.9;margin-bottom:1.25rem;}
    .signal-section p strong{color:var(--cream);font-weight:500;}
    .signal-pull{font-family:'Cormorant',serif;font-style:italic;font-size:clamp(1.35rem,2vw,1.75rem);font-weight:300;color:var(--cream);line-height:1.45;padding:2.5rem 0 2.5rem 2rem;border-left:2px solid var(--red);margin:2.5rem 0;}

    /* SIGNAL CTA */
    .signal-cta{background:var(--ink-0);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:6rem 3.5rem;text-align:center;position:relative;overflow:hidden;}
    .signal-cta::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 50% 70% at 50% 50%,rgba(200,64,26,.06) 0%,transparent 65%);pointer-events:none;}
    .signal-cta h2{font-family:'Cormorant',serif;font-size:clamp(2rem,4vw,4rem);font-weight:300;line-height:1.15;max-width:22ch;margin:0 auto 1.5rem;}
    .signal-cta h2 em{font-style:italic;color:var(--red);}
    .signal-cta p{font-size:.95rem;color:var(--fog-hi);max-width:44ch;margin:0 auto 2.5rem;line-height:1.85;}
    .cta-actions{display:flex;gap:1.5rem;justify-content:center;align-items:center;}
    .btn-primary{display:inline-block;padding:.9rem 2.25rem;background:var(--red);color:var(--cream);font-size:.65rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;text-decoration:none;transition:background .2s,transform .15s;}
    .btn-primary:hover{background:var(--red-hi);transform:translateY(-1px);}
    .btn-ghost{font-size:.65rem;font-weight:500;letter-spacing:.15em;text-transform:uppercase;color:var(--fog-hi);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;transition:color .2s,gap .2s;}
    .btn-ghost:hover{color:var(--cream);gap:.85rem;}

    /* NEXT SIGNAL */
    .next-signal{padding:5rem 3.5rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:3rem;}
    .next-signal-label{font-size:.65rem;font-weight:600;letter-spacing:.25em;text-transform:uppercase;color:var(--fog);margin-bottom:.75rem;}
    .next-signal h3{font-family:'Cormorant',serif;font-size:clamp(1.25rem,2vw,1.75rem);font-weight:300;line-height:1.25;}
    .next-signal h3 em{font-style:italic;color:var(--red);}
    .next-signal a.next-link{display:inline-flex;align-items:center;gap:.5rem;font-size:.65rem;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--red);text-decoration:none;margin-top:1rem;transition:gap .2s;}
    .next-signal a.next-link:hover{gap:.9rem;}

    /* FOOTER */
    footer{background:var(--ink-0);border-top:1px solid var(--line);}
    .footer-inner{padding:4.5rem 3.5rem 0;display:grid;grid-template-columns:5fr 2fr 2fr;gap:5rem;}
    .footer-brand .logo{display:block;margin-bottom:1.25rem;}
    .footer-brand p{font-family:'Cormorant',serif;font-style:italic;font-size:1.05rem;color:var(--fog);max-width:30ch;line-height:1.6;}
    .footer-col h4{font-size:.6rem;font-weight:600;letter-spacing:.3em;text-transform:uppercase;color:var(--red);margin-bottom:1.5rem;}
    .footer-col ul{list-style:none;}
    .footer-col li{margin-bottom:.7rem;}
    .footer-col a{font-size:.82rem;color:var(--fog-hi);text-decoration:none;transition:color .2s;}
    .footer-col a:hover{color:var(--cream);}
    .footer-bottom{margin-top:3.5rem;padding:1.5rem 3.5rem;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;}
    .footer-bottom p{font-size:.7rem;color:var(--fog);letter-spacing:.04em;}

    .reveal{opacity:0;transform:translateY(28px);transition:opacity .9s cubic-bezier(.22,1,.36,1),transform .9s cubic-bezier(.22,1,.36,1);}
    .reveal.visible{opacity:1;transform:translateY(0);}
    .d1{transition-delay:.1s;}.d2{transition-delay:.2s;}.d3{transition-delay:.35s;}

    @media(max-width:768px){
      nav{padding:1.25rem 1.5rem;}
      nav.scrolled{padding:1rem 1.5rem;}
      .signal-hero-inner{padding:0 1.5rem 3.5rem;}
      .signal-body{padding:4rem 1.5rem 3.5rem;}
      .signal-cta{padding:5rem 1.5rem;}
      .cta-actions{flex-direction:column;}
      .next-signal{flex-direction:column;padding:3.5rem 1.5rem;gap:2rem;}
      .footer-inner{grid-template-columns:1fr;gap:2.5rem;padding:3rem 1.5rem 0;}
      .footer-bottom{padding:1.5rem;flex-direction:column;gap:.5rem;text-align:center;}
    }
  
    /* SITE PERFORMANCE PASS: smoother scrolling while preserving atmosphere */
    canvas,
    .rl-canvas,
    .river-ripples,
    .hero-bg,
    .page-header-bg,
    .service-hero-bg,
    .contact-left,
    .contact-right,
    .method-hero-field,
    .signal-hero,
    .featured,
    .services-hero,
    .page-header {
      contain: layout paint style;
    }

    .rl-blob,
    .particle,
    .signal-cloud,
    .sediment-tide,
    .sediment-cool-resonance,
    [class*="glow"],
    [class*="pulse"],
    [class*="field"],
    [class*="gas"],
    [class*="mist"] {
      will-change: transform, opacity;
      transform: translateZ(0);
    }

    .reveal,
    .flow-step,
    .service-entry,
    .dossier-card,
    .contact-link-row,
    .signal-card,
    .article-card,
    .principle-card,
    .pattern-item {
      backface-visibility: hidden;
      transform: translateZ(0);
    }

    @media(max-width:768px) {
      nav.scrolled {
        backdrop-filter: blur(10px);
      }

      .rl-canvas,
      .river-ripples {
        opacity: .48;
        mix-blend-mode: normal !important;
      }

      .rl-blob,
      .particle {
        animation-duration: calc(var(--duration, 1s) * 1.4);
      }

      [class*="glow"],
      [class*="pulse"],
      [class*="field"],
      [class*="gas"],
      [class*="mist"] {
        filter: none;
      }

      .hero-bg [class*="rl-b"],
      .page-header-bg [class*="rl-b"],
      .service-hero-bg [class*="rl-b"] {
        filter: blur(38px) !important;
      }

      .flow-step,
      .service-entry,
      .dossier-card,
      .contact-link-row,
      .signal-card,
      .article-card {
        transition:
          background .45s ease,
          color .35s ease,
          transform .4s cubic-bezier(.22,1,.36,1),
          box-shadow .45s ease,
          border-color .45s ease !important;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: .001ms !important;
      }

      canvas,
      .rl-canvas,
      .river-ripples {
        display: none !important;
      }
    }