/* ============================================================
   SEAVAULT - LIGHT theme foundation (sibling of seavault-base.css)
   Same class and token NAMES, light values. A light page links this
   instead of seavault-base.css; page-specific CSS that uses tokens
   themes automatically. One accent (cyan), one radius system.
   ============================================================ */

@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:#f6f8fc;        /* light base */
  --bg-2:#eef2f8;      /* raised */
  --panel:#ffffff;     /* panel */
  --white:#0a1424;     /* "ink": headings + primary button bg (inverts cleanly via tokens) */
  --ink:#0a1424;
  --body:#424b5c;      /* body text on light */
  --soft:#727d8e;      /* muted */
  --cyan:#008fa0;      /* accent, darkened a touch for contrast on light */
  --line:rgba(12,22,42,.12);
  --line-soft:rgba(12,22,42,.07);
  --paper:#ffffff;     /* plate that holds the light product/illustration images */

  --maxw:1200px;
  --gutter:clamp(20px,4vw,32px);
  --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(0,143,160,.22);color:#07202a}

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:var(--ink);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: navy pill with light text (inverts the dark theme cleanly) */
.btn{display:inline-flex;align-items:stretch;border-radius:var(--r);overflow:hidden;background:var(--ink);box-shadow:0 16px 36px -22px rgba(20,40,80,.35);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(20,40,80,.4)}
.btn:active{transform:translateY(0) scale(.985)}
.btn__t{color:#fff;font-weight:500;padding:15px 22px;font-size:1rem;white-space:nowrap}
.btn__a{background:rgba(255,255,255,.14);color:#fff;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(12,22,42,.28);transform:translateY(-2px);box-shadow:none}
.btn--ghost .btn__t{color:var(--ink)}
.btn--ghost .btn__a{background:transparent;border-left:1px solid var(--line);color:var(--ink)}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}

.rlink{display:inline-flex;align-items:center;gap:8px;color:var(--ink);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 */
.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(246,248,252,.78);backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}
.nav .logo{height:25px;filter:none}            /* original dark-filled logo shows dark on light */
.nav ul{list-style:none;display:flex;gap:30px}
.nav ul a{color:#394455;font-size:.95rem;transition:color .2s}
.nav ul a:hover{color:var(--ink)}
.nav .chip{background:var(--ink);color:#fff;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 plate: white plate, lifted by the bezel border + shadow */
.paper{background:var(--paper);border-radius:var(--r);border:1px solid var(--line-soft);overflow:hidden}
.paper img{width:100%;display:block}

/* bezel: light machined tray (subtle) */
.bezel{background:rgba(12,22,42,.03);border:1px solid var(--line);border-radius:calc(var(--r) + 6px);padding:6px;box-shadow:0 36px 80px -46px rgba(20,45,90,.3)}
.bezel__in{position:relative;border-radius:var(--r);overflow:hidden;box-shadow:inset 0 1px 0 rgba(255,255,255,.7),0 1px 0 rgba(12,22,42,.04)}

/* footer */
.foot{border-top:1px solid var(--line-soft);padding:44px 0;color:var(--soft)}
.foot .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:.9rem}
.foot .logo{height:21px;filter:none;opacity:.9}

/* dark media bands (data-darkhero) stay dark even on the light page, so their text/controls keep light */
[data-darkhero]{color:#fff}
[data-darkhero] h1,[data-darkhero] h2,[data-darkhero] h3{color:#fff}
[data-darkhero] p,[data-darkhero] .lead{color:#e6eaf0}
[data-darkhero] .muted{color:#b8c0cc}
[data-darkhero] .rlink{color:#fff}
[data-darkhero] .btn:not(.btn--ghost){background:#fff}
[data-darkhero] .btn:not(.btn--ghost) .btn__t{color:#0a1424}
[data-darkhero] .btn:not(.btn--ghost) .btn__a{background:#0a1424;color:#fff}
[data-darkhero] .btn--ghost{border-color:rgba(255,255,255,.32)}
[data-darkhero] .btn--ghost .btn__t,[data-darkhero] .btn--ghost .btn__a{color:#fff}
[data-darkhero] .btn--ghost .btn__a{border-left-color:rgba(255,255,255,.32)}

/* nav sitting over a dark hero keeps the dark-theme (light) nav styling */
.nav--over-dark .logo{filter:brightness(0) invert(1)}
.nav--over-dark ul a{color:#dfe4ec}
.nav--over-dark ul a:hover{color:#fff}
.nav--over-dark .chip{background:#fff;color:#0a1424}

/* hero load entrance (CSS-only, fill:both always resolves visible) */
@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}}
}