:root{
    --ink:#0B1416;
    --ink-2:#101C1F;
    --steel:#26343A;
    --sea:#123B3E;
    --foam:#E9E5D9;
    --foam-dim:#B9C1BC;
    --brass:#C08A3E;
    --hazard:#C4491D;
    --line: rgba(233,229,217,0.16);
    --bg: var(--ink);
    --text: var(--foam);
    --text-dim: var(--foam-dim);
    --panel: var(--ink-2);
  }
  :root:not([data-theme="light"]){
    --bg: var(--ink); --text: var(--foam); --panel: var(--ink-2);
  }
  :root[data-theme="light"]{
    --bg:#E9E5D9; --text:#0B1416; --text-dim:#3A4643; --panel:#DAD5C6; --line: rgba(11,20,22,0.14);
  }
  @media (prefers-color-scheme: light){
    :root:not([data-theme="dark"]){
      --bg:#E9E5D9; --text:#0B1416; --text-dim:#3A4643; --panel:#DAD5C6; --line: rgba(11,20,22,0.14);
    }
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--text);
    font-family:'IBM Plex Sans', system-ui, sans-serif;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  h1,h2,h3, .stencil{
    font-family:'Oswald', 'Arial Narrow', sans-serif;
    font-weight:600;
    letter-spacing:0.01em;
    margin:0;
  }
  .mono{ font-family:'IBM Plex Mono', monospace; }
  a{ color:inherit; }
  img,svg{ max-width:100%; display:block; }

  /* ---------- top navigation ---------- */
  .topnav{
    position:fixed;
    top:0; left:0; right:0;
    height:60px;
    z-index:50;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
    padding:0 24px;
    background:var(--ink-2);
    border-bottom:1px solid var(--line);
  }
  .topnav__brand{
    font-family:'Oswald', sans-serif;
    font-size:13px;
    letter-spacing:0.1em;
    text-transform:uppercase;
    text-decoration:none;
    color:var(--text);
    white-space:nowrap;
    padding-left:40px;
  }
  .topnav__brand span{ color:var(--text-dim); font-weight:400; }
  .topnav__links{
    display:flex;
    align-items:center;
    gap:22px;
    flex-wrap:wrap;
  }
  .topnav__link{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    letter-spacing:0.04em;
    text-decoration:none;
    color:var(--text-dim);
    padding:6px 0;
    border-bottom:1px solid transparent;
    transition:color .15s ease, border-color .15s ease;
  }
  .topnav__link:hover{ color:var(--text); }
  .topnav__link.is-active{ color:var(--brass); border-color:var(--brass); }
  .topnav__social{
    display:flex; align-items:center; justify-content:center;
    width:28px; height:28px;
    color:var(--text-dim);
  }
  .topnav__social:hover{ color:var(--text); }
  .topnav__social svg{ width:16px; height:16px; }
  @media (max-width:760px){
    .topnav{ padding:0 12px; }
    .topnav__brand{ display:none; }
    .topnav__links{ gap:12px; }
    .topnav__link{ font-size:10.5px; }
  }

  /* ---------- sub-page hero ---------- */
  .subhero{ padding:156px 0 44px; border-bottom:1px solid var(--line); }
  .subhero__eyebrow{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    color:var(--text-dim);
    margin-bottom:20px;
  }
  .subhero h1{
    font-size:clamp(2.1rem, 5.5vw, 3.4rem);
    line-height:1.02;
    text-transform:uppercase;
  }
  .subhero h1 span{ color:var(--brass); }
  .subhero p{
    max-width:620px;
    font-size:1.05rem;
    line-height:1.65;
    color:var(--text-dim);
    margin-top:22px;
  }
  @media (max-width:640px){
    .subhero{ padding:110px 0 32px; }
  }

  /* ---------- layout shell ---------- */
  .rail{
    position:fixed;
    left:0; top:60px; bottom:0;
    width:64px;
    border-right:1px solid var(--line);
    z-index:40;
    display:flex;
    flex-direction:column;
    align-items:center;
    padding:22px 0;
    background:linear-gradient(180deg, var(--sea) 0%, var(--ink-2) 55%, var(--ink) 100%);
    overflow:hidden;
  }
  .rail::before{
    content:'';
    position:absolute;
    inset:0;
    pointer-events:none;
    background:
      repeating-linear-gradient(115deg,
        rgba(233,229,217,0.05) 0px,
        rgba(233,229,217,0.05) 1px,
        transparent 1px,
        transparent 34px);
    opacity:0.5;
    animation:water-shimmer 9s linear infinite;
  }
  @keyframes water-shimmer{
    0%{ background-position:0 0; }
    100%{ background-position:0 220px; }
  }
  .rail__bubble{
    position:absolute;
    left:50%;
    border-radius:50%;
    background:rgba(233,229,217,0.4);
    box-shadow:inset -1px -1px 1px rgba(0,0,0,0.2), 0 0 3px rgba(233,229,217,0.35);
    pointer-events:none;
    z-index:1;
    will-change:transform, opacity;
    animation:bubble-rise var(--dur,1800ms) ease-out forwards;
  }
  @keyframes bubble-rise{
    0%{ transform:translate(-50%, 0) scale(0.5); opacity:0; }
    10%{ opacity:0.9; }
    85%{ opacity:0.6; }
    100%{ transform:translate(calc(-50% + var(--drift,6px)), calc(-1 * var(--rise,120px))) scale(1); opacity:0; }
  }
  .rail__brand{
    writing-mode:vertical-rl;
    text-orientation:mixed;
    font-family:'Oswald', sans-serif;
    font-size:12px;
    letter-spacing:0.14em;
    color:var(--text-dim);
    margin-bottom:24px;
  }
  .rail__gauge{
    position:relative;
    flex:1;
    width:2px;
    background:var(--line);
    margin:8px 0;
  }
  .rail__tick{
    position:absolute;
    left:-4px;
    width:10px;
    height:1px;
    background:var(--text-dim);
  }
  .rail__tick-label{
    position:absolute;
    left:14px;
    transform:translateY(-50%);
    font-family:'IBM Plex Mono', monospace;
    font-size:10px;
    color:var(--text-dim);
    white-space:nowrap;
  }
  .rail__marker{
    position:absolute;
    left:-17px;
    width:34px;
    max-width:none;
    transform:translate(0, -50%);
    transition:top 0.08s linear;
    display:block;
    z-index:2;
  }
  .rail__seabed{
    display:flex;
    justify-content:center;
    margin-bottom:6px;
    pointer-events:none;
  }
  .rail__seabed img{ display:block; width:54px; height:auto; max-width:none; }
  .rail__hose{
    position:absolute;
    top:0; left:50%;
    transform:translateX(-50%);
    overflow:visible;
    pointer-events:none;
  }
  .rail__depth{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    color:var(--brass);
    margin-top:10px;
    letter-spacing:0.06em;
  }

  main{ margin-left:64px; margin-top:60px; }

  .wrap{
    max-width:920px;
    margin:0 auto;
    padding:0 28px;
  }

  section{ padding:88px 0; border-bottom:1px solid var(--line); position:relative; }
  section:last-of-type{ border-bottom:none; }

  .plate-label{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    letter-spacing:0.08em;
    color:var(--brass);
    margin-bottom:14px;
    display:flex;
    align-items:center;
    gap:10px;
  }
  .plate-label::before{
    content:"";
    width:18px; height:1px;
    background:var(--brass);
    display:inline-block;
  }

  /* ---------- hero ---------- */
  .hero{
    padding-top:64px;
    min-height:92vh;
    display:flex;
    flex-direction:column;
    justify-content:center;
    border-bottom:1px solid var(--line);
  }
  .hero__eyebrow{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    color:var(--text-dim);
    margin-bottom:22px;
  }
  .hero__top{
    display:flex;
    align-items:flex-start;
    justify-content:space-between;
    gap:32px;
  }
  .hero__badge{
    width:clamp(90px, 12vw, 170px);
    height:clamp(90px, 12vw, 170px);
    border-radius:50%;
    flex-shrink:0;
    margin-top:8px;
  }
  @media (max-width:760px){
    .hero__badge{ display:none; }
  }
  .hero h1{
    font-size:clamp(2.6rem, 7vw, 5.2rem);
    line-height:0.98;
    text-transform:uppercase;
  }
  .hero h1 span{ display:block; }
  .hero__accent{ color:var(--brass); }
  .hero__sub{
    max-width:520px;
    font-size:1.08rem;
    line-height:1.6;
    color:var(--text-dim);
    margin-top:28px;
  }
  .hero__cta{
    display:flex;
    gap:14px;
    flex-wrap:wrap;
    margin-top:38px;
  }
  .btn{
    font-family:'IBM Plex Mono', monospace;
    font-size:13px;
    letter-spacing:0.03em;
    padding:14px 22px;
    border:1px solid var(--text);
    background:transparent;
    color:var(--text);
    text-decoration:none;
    display:inline-block;
    transition:background .15s ease, color .15s ease;
  }
  .btn--solid{
    background:var(--brass);
    border-color:var(--brass);
    color:var(--ink);
  }
  .btn:hover{ background:var(--text); color:var(--bg); }
  .btn--solid:hover{ background:var(--foam); color:var(--ink); border-color:var(--foam); }

  .hero__vessel-mark{
    position:absolute;
    right:28px;
    bottom:40px;
    width:180px;
    opacity:0.55;
  }
  @media (max-width: 760px){ .hero__vessel-mark{ display:none; } }

  /* ---------- capabilities ---------- */
  .cap-grid{
    display:grid;
    grid-template-columns: 1.3fr 1fr;
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    margin-top:36px;
  }
  .cap{
    background:var(--bg);
    padding:32px;
  }
  .cap:nth-child(1){ grid-column:1 / 2; grid-row:1 / 3; }
  .cap:nth-child(2){ grid-column:2 / 3; grid-row:1 / 2; }
  .cap:nth-child(3){ grid-column:2 / 3; grid-row:2 / 3; }
  .cap:nth-child(4){ grid-column:1 / 3; }
  .cap__icon{ width:34px; height:20px; margin-bottom:18px; color:var(--brass); }
  .cap__icon svg{ width:100%; height:100%; }
  .cap h3{ font-size:1.3rem; text-transform:uppercase; margin-bottom:10px; }
  .cap p{ color:var(--text-dim); line-height:1.6; font-size:0.95rem; margin:0; }
  @media (max-width: 720px){
    .cap-grid{ grid-template-columns:1fr; }
    .cap:nth-child(1),.cap:nth-child(2),.cap:nth-child(3),.cap:nth-child(4){
      grid-column:auto; grid-row:auto;
    }
  }

  /* ---------- accreditation ---------- */
  .accred{
    display:flex;
    gap:0;
    margin-top:30px;
    border:1px solid var(--line);
  }
  .accred__item{
    flex:1;
    padding:26px 28px;
    border-right:1px solid var(--line);
  }
  .accred__item:last-child{ border-right:none; }
  .accred__tag{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    color:var(--brass);
    letter-spacing:0.06em;
    margin-bottom:8px;
  }
  .accred__item p{ margin:0; color:var(--text-dim); font-size:0.92rem; line-height:1.55; }
  @media (max-width: 640px){
    .accred{ flex-direction:column; }
    .accred__item{ border-right:none; border-bottom:1px solid var(--line); }
    .accred__item:last-child{ border-bottom:none; }
  }

  /* ---------- vessel spec sheet ---------- */
  .spec-sheet{
    border:1px solid var(--line);
    margin-top:36px;
    display:grid;
    grid-template-columns: 1.1fr 1fr;
  }
  .spec-sheet__art{
    padding:30px;
    border-right:1px solid var(--line);
    display:flex;
    align-items:center;
  }
  .spec-sheet__list{ padding:8px 0; }
  .spec-row{
    display:flex;
    justify-content:space-between;
    gap:16px;
    padding:16px 26px;
    border-bottom:1px solid var(--line);
  }
  .spec-row:last-child{ border-bottom:none; }
  .spec-row__k{ color:var(--text-dim); font-size:0.85rem; }
  .spec-row__v{ font-family:'IBM Plex Mono', monospace; font-size:0.9rem; text-align:right; }
  @media (max-width: 720px){
    .spec-sheet{ grid-template-columns:1fr; }
    .spec-sheet__art{ border-right:none; border-bottom:1px solid var(--line); }
  }

  /* ---------- coverage ---------- */
  .coverage{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap:40px;
    align-items:center;
    margin-top:30px;
  }
  .coverage__map{ border:1px solid var(--line); padding:20px; }
  .coverage__copy p{ color:var(--text-dim); line-height:1.7; }
  .coverage__pin-label{ font-family:'IBM Plex Mono', monospace; font-size:11px; fill:var(--brass); }
  @media (max-width: 720px){ .coverage{ grid-template-columns:1fr; } }

  /* ---------- contact / footer ---------- */
  .contact{
    background:var(--panel);
    border-top:1px solid var(--line);
  }
  .contact h2{ font-size:clamp(1.8rem,4vw,2.6rem); text-transform:uppercase; }
  .contact__grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:40px;
    margin-top:34px;
  }
  .contact__block{ border-left:2px solid var(--brass); padding-left:18px; }
  .contact__block h4{ font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:0.06em; color:var(--brass); margin-bottom:8px; font-weight:500;}
  .contact__block p, .contact__block a{ color:var(--text-dim); font-size:0.95rem; line-height:1.6; text-decoration:none; }
  .contact__block a:hover{ color:var(--text); }
  .contact__note{
    margin-top:44px;
    padding:16px 18px;
    border:1px dashed var(--line);
    font-size:0.85rem;
    color:var(--text-dim);
    font-style:italic;
  }
  @media (max-width: 640px){ .contact__grid{ grid-template-columns:1fr; } }

  footer{
    padding:26px 0 40px;
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    color:var(--text-dim);
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:10px;
  }

  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    .rail__marker{ transition:none; }
  }

  @media (max-width: 640px){
    .rail{ width:34px; top:50px; }
    .rail__brand{ display:none; }
    main{ margin-left:34px; margin-top:50px; }
    section{ padding:60px 0; }
    .rail__seabed img{ width:30px; }
    .wrap{ padding:0 18px; }
    .topnav{ height:50px; }
  }  .floating-contact{
    position:fixed;
    right:20px;
    bottom:24px;
    z-index:60;
    display:flex;
    flex-direction:column;
    gap:12px;
  }
  .floating-contact__btn{
    width:52px; height:52px;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    box-shadow:0 4px 14px rgba(0,0,0,0.4);
    transition:transform 0.15s ease, box-shadow 0.15s ease;
    text-decoration:none;
  }
  .floating-contact__btn:hover{
    transform:translateY(-2px) scale(1.05);
    box-shadow:0 6px 18px rgba(0,0,0,0.5);
  }
  .floating-contact__btn svg{ width:26px; height:26px; display:block; }
  .floating-contact__btn--whatsapp{ background:#25D366; }
  .floating-contact__btn--email{ background:var(--brass); }
  @media (max-width:600px){
    .floating-contact{ right:14px; bottom:18px; }
    .floating-contact__btn{ width:46px; height:46px; }
    .floating-contact__btn svg{ width:22px; height:22px; }
  }

  /* ---------- enquiry form ---------- */
  .enquiry-form{
    background:var(--panel, #1a1e21);
    border:1px solid var(--line);
    border-radius:4px;
    padding:28px;
    margin-bottom:36px;
  }
  .enquiry-form__row{
    margin-bottom:16px;
    display:flex;
    flex-direction:column;
    gap:6px;
  }
  .enquiry-form__row label{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    letter-spacing:0.06em;
    color:var(--text-dim);
    text-transform:uppercase;
  }
  .enquiry-form__row input,
  .enquiry-form__row textarea{
    background:var(--bg);
    border:1px solid var(--line);
    border-radius:3px;
    padding:10px 12px;
    color:var(--text);
    font-family:inherit;
    font-size:14px;
  }
  .enquiry-form__row input:focus,
  .enquiry-form__row textarea:focus{
    outline:none;
    border-color:var(--brass);
  }
  .enquiry-form__row textarea{ resize:vertical; min-height:100px; }
  .enquiry-form__hp{ position:absolute; left:-9999px; }
  .enquiry-form__submit{
    border:none;
    cursor:pointer;
    font-family:'Oswald', sans-serif;
    letter-spacing:0.04em;
  }
  .enquiry-form__submit:disabled{ opacity:0.6; cursor:default; }
  .enquiry-form__status{
    margin-top:12px;
    font-family:'IBM Plex Mono', monospace;
    font-size:13px;
  }
  .enquiry-form__status--ok{ color:#5fbf7a; }
  .enquiry-form__status--err{ color:#d94f3d; }

  /* ---------- service detail blocks ---------- */
  .service-block{ margin-top:34px; }
  .service-block:first-child{ margin-top:36px; }
  .service-block h3{
    font-size:1.15rem;
    text-transform:uppercase;
    margin-bottom:10px;
    color:var(--foam);
  }
  .service-block__lede{ color:var(--text-dim); line-height:1.7; margin:0 0 16px; }
  .service-cap{ margin-bottom:14px; }
  .service-cap__t{
    font-family:'IBM Plex Mono', monospace;
    font-size:12px;
    letter-spacing:0.04em;
    color:var(--brass);
    display:block;
    margin-bottom:4px;
  }
  .service-cap p{ color:var(--text-dim); line-height:1.7; margin:0; font-size:0.95rem; }

  /* ---------- checkbox row (enquiry form) ---------- */
  .enquiry-form__checks{
    display:flex;
    flex-wrap:wrap;
    gap:10px 18px;
  }
  .enquiry-form__check{
    display:flex;
    align-items:center;
    gap:6px;
    font-size:13px;
    color:var(--text-dim);
  }
  .enquiry-form__check input{ accent-color:var(--brass); }
  .enquiry-form__grid2{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
  }
  @media (max-width:560px){ .enquiry-form__grid2{ grid-template-columns:1fr; } }
  .enquiry-form__hint{
    font-size:0.82rem;
    color:var(--text-dim);
    margin:-4px 0 20px;
    line-height:1.6;
  }

  /* ---------- explore grid (home) ---------- */
  .explore{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    margin-top:30px;
  }
  .explore a{
    background:var(--bg);
    padding:28px;
    text-decoration:none;
    color:inherit;
    display:block;
    transition:background .15s ease;
  }
  .explore a:hover{ background:var(--panel); }
  .explore__tag{
    font-family:'IBM Plex Mono', monospace;
    font-size:11px;
    color:var(--brass);
    margin-bottom:10px;
    display:block;
  }
  .explore h3{ font-size:1.1rem; text-transform:uppercase; margin-bottom:8px; }
  .explore p{ color:var(--text-dim); font-size:0.9rem; line-height:1.6; margin:0; }
  @media (max-width:720px){ .explore{ grid-template-columns:1fr; } }

  /* ---------- sea life pods ---------- */
  .pods{ display:grid; grid-template-columns:1.1fr 0.9fr; gap:40px; align-items:start; margin-top:30px; }
  .pods__copy p{ color:var(--text-dim); line-height:1.7; margin:0 0 14px; }
  .pods__art{ border:1px solid var(--line); padding:20px; }
  .pods__art svg{ width:100%; height:auto; }
  @media (max-width:760px){ .pods{ grid-template-columns:1fr; } }