/* ============================================================
   SEAVAULT - shared SEALINK brand foundation
   One theme (dark navy), one accent (cyan), one radius system.
   Used by all 5 concept directions so identity stays identical.
   ============================================================ */

/* ---- real brand fonts (from the live SEALINK site) ---- */
@font-face{font-family:'BDO Grotesk';src:url('fonts/BDOGrotesk-Regular.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'BDO Grotesk';src:url('fonts/BDOGrotesk-Medium.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'DM Mono';src:url('fonts/DMMono-Regular.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}

:root{
  --bg:#0a0f1d;        /* base navy */
  --bg-2:#0c1322;      /* raised */
  --panel:#101a2e;     /* dark panel */
  --white:#ffffff;
  --body:#c7ccd6;      /* body text */
  --soft:#878f9d;      /* muted */
  --cyan:#00bacd;      /* the single accent - locked */
  --line:rgba(255,255,255,.10);
  --line-soft:rgba(255,255,255,.06);
  --paper:#f3f5f8;     /* light diagram panels */
  --paper-ink:#0a0f1d;

  --maxw:1200px;
  --gutter:clamp(20px,4vw,32px);

  /* shape lock: pill for the contact chip, 14px for panels/buttons, 10px for small */
  --r-pill:999px;
  --r:14px;
  --r-sm:10px;

  --f:'BDO Grotesk',-apple-system,system-ui,Segoe UI,Arial,sans-serif;
  --mono:'DM Mono',ui-monospace,SFMono-Regular,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:var(--f);background:var(--bg);color:var(--body);font-weight:400;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:rgba(0,186,205,.28);color:#fff}

h1,h2,h3{font-family:var(--f);font-weight:500;color:var(--white);line-height:1.12;letter-spacing:-.005em}
h1{font-size:clamp(2.4rem,1.5rem+3.6vw,4.4rem)}
h2{font-size:clamp(1.9rem,1.3rem+2vw,2.9rem)}
h3{font-size:1.35rem;line-height:1.25}
p{color:var(--body);max-width:60ch}
strong{color:#fff;font-weight:500}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter);width:100%}
.lead{font-size:clamp(1.05rem,1rem+.35vw,1.28rem);color:var(--body)}
.muted{color:var(--soft)}
.accent{color:var(--cyan)}

/* ---------- buttons: SEALINK split-button (brand signature) ---------- */
.btn{display:inline-flex;align-items:stretch;border-radius:var(--r);overflow:hidden;background:var(--white);box-shadow:0 16px 36px -22px rgba(3,9,24,.8);transition:transform .3s cubic-bezier(.32,.72,0,1),box-shadow .3s var(--ease)}
.btn:hover{transform:translateY(-2px);box-shadow:0 24px 46px -22px rgba(3,9,24,.85)}
.btn:active{transform:translateY(0) scale(.985)}
.btn__t{color:var(--bg);font-weight:500;padding:15px 22px;font-size:1rem;white-space:nowrap}
.btn__a{background:var(--bg);color:var(--white);width:52px;display:grid;place-items:center}
.btn__a svg{width:18px;height:18px;transition:transform .3s cubic-bezier(.32,.72,0,1)}
.btn:hover .btn__a svg{transform:translateX(3px)}
.btn--ghost{background:transparent;border:1px solid var(--line);box-shadow:none}
.btn--ghost:hover{border-color:rgba(255,255,255,.28);transform:translateY(-2px);box-shadow:none}
.btn--ghost .btn__t{color:var(--white)}
.btn--ghost .btn__a{background:transparent;border-left:1px solid var(--line)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}

/* link with cyan underline */
.rlink{display:inline-flex;align-items:center;gap:8px;color:#fff;font-weight:500;border-bottom:1px solid var(--cyan);padding-bottom:3px;transition:gap .2s var(--ease)}
.rlink:hover{gap:12px}
.rlink svg{width:15px;height:15px;color:var(--cyan)}

/* ---------- nav (one line, <=72px) ---------- */
.nav{position:absolute;top:0;left:0;right:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px var(--gutter)}
.nav.solid{position:sticky;background:rgba(10,15,29,.72);backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}
.nav .logo{height:25px;filter:brightness(0) invert(1)}
.nav ul{list-style:none;display:flex;gap:30px}
.nav ul a{color:#d7dce4;font-size:.95rem;transition:color .2s}
.nav ul a:hover{color:#fff}
.nav .chip{background:#fff;color:var(--bg);padding:11px 20px;border-radius:var(--r-pill);font-weight:500;font-size:.93rem;transition:transform .2s var(--ease)}
.nav .chip:hover{transform:translateY(-2px)}
@media(max-width:820px){.nav ul{display:none}}

/* ---------- light diagram panel ---------- */
.paper{background:var(--paper);border-radius:var(--r);border:1px solid var(--line-soft);overflow:hidden}
.paper img{width:100%;display:block}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line-soft);padding:44px 0;color:var(--soft);margin-top:0}
.foot .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:.9rem}
.foot .logo{height:21px;filter:brightness(0) invert(1);opacity:.9}

/* ---------- machined-hardware depth: bezel (outer shell + inner core) ---------- */
.bezel{background:rgba(255,255,255,.035);border:1px solid var(--line);border-radius:calc(var(--r) + 6px);padding:6px;box-shadow:0 46px 100px -50px rgba(3,9,24,.95)}
.bezel__in{position:relative;border-radius:var(--r);overflow:hidden;box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}

/* ---------- hero load entrance (CSS-only; fill:both always resolves visible, no JS, never hides content) ---------- */
@media(prefers-reduced-motion:no-preference){
  .enter{animation:enter .8s var(--ease) both}
  .enter.e1{animation-delay:.06s}.enter.e2{animation-delay:.14s}.enter.e3{animation-delay:.22s}.enter.e4{animation-delay:.30s}
  @keyframes enter{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
}