/* Atlantic Subsurface Data Hub — simple static site */
/* No frameworks. Minimal, responsive, accessible. */

:root{
  --bg:#0b1220;
  --card:#101a2f;
  --text:#e8eefc;
  --muted:#b8c4e6;
  --line:rgba(232,238,252,.14);
  --accent:#7aa7ff;
  --accent2:#7fffd4;
  --shadow: 0 12px 30px rgba(0,0,0,.35);
  --radius:16px;
  --max: 1100px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background: radial-gradient(1200px 700px at 20% -10%, rgba(122,167,255,.25), transparent 60%),
              radial-gradient(900px 600px at 85% 5%, rgba(127,255,212,.18), transparent 55%),
              var(--bg);
  line-height:1.55;
}

a{ color:inherit; text-decoration-color: rgba(232,238,252,.35); }
a:hover{ text-decoration-color: rgba(232,238,252,.8); }

.muted{ color: var(--muted); }

.container{
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.skip-link{
  position:absolute;
  left:-999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
}
.skip-link:focus{
  position:fixed;
  left:1rem;
  top:1rem;
  width:auto;
  height:auto;
  padding:.6rem .9rem;
  background:var(--card);
  border:1px solid var(--line);
  border-radius: 12px;
  z-index: 9999;
}

/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter: blur(10px);
  background: rgba(11,18,32,.7);
  border-bottom: 1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: .9rem 0;
  gap:1rem;
}
.brand{
  display:flex;
  gap:.75rem;
  align-items:center;
  min-width: 240px;
}
.logo{
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  font-weight:800;
  letter-spacing:.04em;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(122,167,255,.35), rgba(127,255,212,.18));
  border: 1px solid rgba(232,238,252,.22);
  box-shadow: var(--shadow);
}
.brand-text{
  display:flex;
  flex-direction:column;
  line-height:1.15;
}
.brand-text span{
  color:var(--muted);
  font-size:.9rem;
  margin-top:.15rem;
}

.nav{
  display:flex;
  align-items:center;
  gap:.9rem;
  flex-wrap:wrap;
  justify-content:flex-end;
}
.nav a{
  color:var(--muted);
  text-decoration:none;
  padding:.35rem .5rem;
  border-radius: 10px;
}
.nav a:hover{
  color:var(--text);
  background: rgba(232,238,252,.06);
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:.85rem 1.05rem;
  border-radius: 999px;
  border:1px solid rgba(232,238,252,.20);
  background: rgba(122,167,255,.18);
  text-decoration:none;
  font-weight:650;
  box-shadow: 0 8px 18px rgba(0,0,0,.25);
}
.btn:hover{
  background: rgba(122,167,255,.24);
}
.btn-ghost{
  background: rgba(232,238,252,.06);
}
.btn-ghost:hover{
  background: rgba(232,238,252,.10);
}
.btn-small{
  padding:.55rem .85rem;
  font-weight:650;
}

/* Sections */
.section{
  padding: 4rem 0;
}
.section-alt{
  background: linear-gradient(180deg, rgba(232,238,252,.03), transparent 55%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.hero{
  position: relative;
  overflow: hidden;
  padding: 4.25rem 0 2.5rem;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  /* Replace hero-bg.svg with a photo (hero.webp / hero.jpg) when ready */
  background:
    linear-gradient(180deg, rgba(11,18,32,.82) 0%, rgba(11,18,32,.55) 55%, rgba(11,18,32,.90) 100%),
    url("assets/hero-bg.svg") center/cover no-repeat;
}
.hero-inner{
  position: relative;
  z-index: 1;
}
.hero-inner{
  display:grid;
  grid-template-columns: 1.25fr .9fr;
  gap: 2rem;
  align-items:start;
}
h1{
  margin:0 0 .75rem;
  font-size: clamp(2.1rem, 3.5vw, 3.1rem);
  line-height:1.1;
  letter-spacing:-.02em;
}
.lead{
  color:var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1.25rem;
}
.cta-row{
  display:flex;
  gap:.75rem;
  flex-wrap:wrap;
  margin: 1.2rem 0 1.25rem;
}

.bullets{
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}
.bullets li{ margin:.35rem 0; }

.hero-card .card{
  background: rgba(16,26,47,.65);
  border: 1px solid rgba(232,238,252,.14);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}
.card-row{
  display:grid;
  grid-template-columns: 120px 1fr;
  gap:.9rem;
  padding:.65rem 0;
  border-bottom: 1px solid rgba(232,238,252,.10);
}
.card-row:last-child{ border-bottom:0; }
.tag{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height: 28px;
  padding: 0 .7rem;
  border-radius: 999px;
  background: rgba(232,238,252,.07);
  border: 1px solid rgba(232,238,252,.12);
  color: var(--muted);
  font-size: .85rem;
  white-space:nowrap;
}
.fineprint{
  color: rgba(232,238,252,.72);
  font-size: .92rem;
  margin: .9rem 0 0;
}

/* Grids */
.grid-3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin-top: 1.6rem;
}
.grid-2{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.1rem;
  margin-top: 1.6rem;
}

.gallery{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin-top: 1.6rem;
}
.tile{
  margin:0;
  background: rgba(16,26,47,.55);
  border: 1px solid rgba(232,238,252,.14);
  border-radius: var(--radius);
  overflow:hidden;
}
.tile img{
  width:100%;
  height: 200px;
  object-fit: cover;
  display:block;
}
.tile figcaption{
  padding: .85rem 1rem 1rem;
  color: rgba(232,238,252,.82);
  font-weight: 650;
}


.panel{
  background: rgba(16,26,47,.55);
  border: 1px solid rgba(232,238,252,.14);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.panel h3{
  margin:.15rem 0 .55rem;
  font-size: 1.1rem;
}
.panel p{ color: var(--muted); margin: 0 0 .75rem; }
.panel ul{
  margin:.6rem 0 0;
  padding-left: 1.1rem;
  color: rgba(232,238,252,.78);
}
.panel li{ margin:.35rem 0; }

.panel-img{
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid rgba(232,238,252,.14);
  background: rgba(232,238,252,.04);
  margin-bottom: .9rem;
}

.callout{
  margin-top: 1.35rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px dashed rgba(232,238,252,.22);
  color: var(--muted);
  background: rgba(232,238,252,.04);
}

/* Steps */
.steps{
  display:grid;
  gap: 1rem;
  margin-top: 1.6rem;
}
.step{
  display:grid;
  grid-template-columns: 48px 1fr;
  gap: 1rem;
  padding: 1.1rem 1.1rem;
  border-radius: var(--radius);
  background: rgba(16,26,47,.45);
  border: 1px solid rgba(232,238,252,.12);
}
.step-num{
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display:grid;
  place-items:center;
  font-weight: 800;
  background: rgba(122,167,255,.18);
  border: 1px solid rgba(232,238,252,.18);
}
.step h3{ margin:.05rem 0 .35rem; }
.step p{ margin:0; color: var(--muted); }

/* Contact */
.contact-box{
  margin-top: 1.35rem;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.contact-label{
  margin:0;
  color: rgba(232,238,252,.65);
  font-size: .9rem;
}
.note{
  margin-top: 1.3rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  background: rgba(122,167,255,.12);
  border: 1px solid rgba(232,238,252,.16);
  color: rgba(232,238,252,.85);
}

/* Footer */
.site-footer{
  padding: 2.25rem 0 3rem;
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:1rem;
  flex-wrap:wrap;
  color: rgba(232,238,252,.76);
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}

/* Responsive */
@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; }
  .grid-3{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr; }
  .contact-box{ grid-template-columns: 1fr; }
  .gallery{ grid-template-columns: 1fr; }
  .brand{ min-width: unset; }
  .card-row{ grid-template-columns: 1fr; }
  .tag{ justify-content:flex-start; width: fit-content; }
}