/* File: style.css */
/* Clean, modern, readable. No frameworks needed. */

/* ---------- Base ---------- */
:root{
  --bg: #0b0f14;
  --bg2:#0f1520;
  --card:#121a26;
  --text:#e8eef7;
  --muted:#a8b3c7;
  --line:#243247;
  --link:#9ad1ff;
  --link2:#b9a7ff;
  --accent:#66e3c4;
  --accent2:#7aa7ff;

  --radius: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --container: 1100px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Helvetica Neue", Helvetica, sans-serif;
  background: radial-gradient(1200px 700px at 20% -10%, rgba(102,227,196,.15), transparent 60%),
              radial-gradient(900px 600px at 90% 0%, rgba(122,167,255,.15), transparent 55%),
              linear-gradient(180deg, var(--bg) 0%, #070a0f 100%);
  color: var(--text);
  line-height:1.55;
}

a{ color: var(--link); text-decoration:none; }
a:hover{ text-decoration:underline; }
p{ margin:0 0 1rem 0; color: var(--muted); }
h1,h2,h3{ margin:0 0 .6rem 0; color: var(--text); line-height:1.15; }
h1{ font-size: clamp(1.8rem, 3.2vw, 3rem); letter-spacing:-.02em; }
h2{ font-size: clamp(1.3rem, 2.2vw, 1.8rem); }
h3{ font-size: 1.1rem; }

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

/* ---------- Topbar ---------- */
.topbar{
  background: rgba(18,26,38,.75);
  border-bottom: 1px solid rgba(36,50,71,.6);
  backdrop-filter: blur(10px);
}
.topbar__inner{
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.55rem 0;
  font-size:.92rem;
}
.topbar__tag{ color: var(--muted); }
.topbar__sep{ color: rgba(168,179,199,.5); }

/* ---------- Header / Nav ---------- */
.header{
  position: sticky;
  top:0;
  z-index:50;
  background: rgba(11,15,20,.55);
  border-bottom: 1px solid rgba(36,50,71,.6);
  backdrop-filter: blur(12px);
}
.header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding: .85rem 0;
}

.brand{
  display:flex;
  align-items:center;
  gap:.9rem;
  text-decoration:none;
}
.brand:hover{ text-decoration:none; }

.brand__mark{
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  border-radius: 12px;
  background:
    radial-gradient(12px 12px at 30% 30%, rgba(102,227,196,.35), transparent 60%),
    radial-gradient(18px 18px at 80% 20%, rgba(122,167,255,.35), transparent 65%),
    linear-gradient(135deg, rgba(102,227,196,.20), rgba(122,167,255,.18));
  border:1px solid rgba(36,50,71,.8);
  box-shadow: var(--shadow);
  font-weight:800;
  letter-spacing:-.03em;
  color: var(--text);
}
.brand__name{
  font-weight: 800;
  letter-spacing:-.02em;
}
.brand__sub{
  font-size:.92rem;
  color: var(--muted);
}

.nav{
  display:flex;
  gap: 1rem;
  align-items:center;
}
.nav a{
  color: var(--text);
  font-size:.95rem;
  padding:.35rem .5rem;
  border-radius: 10px;
}
.nav a:hover{
  background: rgba(18,26,38,.65);
  text-decoration:none;
}
.nav__cta{
  background: linear-gradient(135deg, rgba(102,227,196,.18), rgba(122,167,255,.18));
  border:1px solid rgba(36,50,71,.8);
}

.nav__toggle{
  display:none;
  width: 44px;
  height: 40px;
  border-radius: 12px;
  border:1px solid rgba(36,50,71,.8);
  background: rgba(18,26,38,.45);
  cursor:pointer;
}
.nav__toggle span{
  display:block;
  height:2px;
  width:18px;
  background: rgba(232,238,247,.9);
  margin: 5px auto;
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero{
  padding: 3.2rem 0 2.2rem;
}
.hero__grid{
  display:grid;
  grid-template-columns: 1.4fr .9fr;
  gap: 1.5rem;
  align-items:start;
}
.lead{
  font-size: 1.05rem;
  color: rgba(232,238,247,.78);
  max-width: 64ch;
}

.hero__actions{
  display:flex;
  gap:.75rem;
  margin: 1.2rem 0 1rem;
  flex-wrap:wrap;
}

.hero__meta{
  display:flex;
  gap:.55rem;
  flex-wrap:wrap;
  margin-top:.8rem;
}

.pill{
  border:1px solid rgba(36,50,71,.8);
  background: rgba(18,26,38,.45);
  color: rgba(232,238,247,.82);
  padding:.35rem .55rem;
  border-radius: 999px;
  font-size:.88rem;
}

.card{
  background: linear-gradient(180deg, rgba(18,26,38,.75), rgba(18,26,38,.45));
  border: 1px solid rgba(36,50,71,.85);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
}
.card__title{
  font-size: 1.05rem;
  margin-bottom:.65rem;
}
.facts{
  margin:0;
}
.facts__row{
  display:grid;
  grid-template-columns: 120px 1fr;
  gap:.8rem;
  padding:.55rem 0;
  border-top:1px solid rgba(36,50,71,.55);
}
.facts__row:first-child{ border-top:none; padding-top:0; }
.facts dt{ color: rgba(232,238,247,.75); font-weight:600; }
.facts dd{ margin:0; color: var(--muted); }

.card__links{
  margin-top:.8rem;
  display:flex;
  gap:1rem;
  flex-wrap:wrap;
}
.link{
  color: var(--link);
  font-weight:600;
}

/* ---------- Sections ---------- */
.section{
  padding: 2.2rem 0;
}
.section--alt{
  background: linear-gradient(180deg, rgba(15,21,32,.75), rgba(11,15,20,0));
  border-top: 1px solid rgba(36,50,71,.35);
  border-bottom: 1px solid rgba(36,50,71,.35);
}
.section__head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:1.2rem;
  margin-bottom: 1.25rem;
  flex-wrap:wrap;
}
.section__head p{
  margin:0;
  max-width: 70ch;
}
.section__actions{
  display:flex;
  gap:.75rem;
  margin-top: 1.2rem;
  flex-wrap:wrap;
}

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

.tile{
  background: rgba(18,26,38,.45);
  border: 1px solid rgba(36,50,71,.75);
  border-radius: var(--radius);
  padding: 1rem;
  transition: transform .15s ease, border-color .15s ease;
}
.tile:hover{
  transform: translateY(-2px);
  border-color: rgba(154,209,255,.45);
}
.tile p{ margin-bottom:.8rem; }
.tile__link{ font-weight:700; color: var(--link2); }

.feature{
  background:
    radial-gradient(350px 200px at 20% 10%, rgba(102,227,196,.12), transparent 65%),
    radial-gradient(350px 200px at 85% 20%, rgba(122,167,255,.12), transparent 65%),
    rgba(18,26,38,.45);
  border: 1px solid rgba(36,50,71,.75);
  border-radius: var(--radius);
  padding: 1.1rem;
}
.feature__kicker{
  display:inline-block;
  font-size:.82rem;
  color: rgba(232,238,247,.72);
  border:1px solid rgba(36,50,71,.65);
  background: rgba(18,26,38,.35);
  padding:.2rem .5rem;
  border-radius: 999px;
  margin-bottom:.6rem;
}

/* ---------- Publications preview ---------- */
.pubs{
  display:grid;
  gap:.75rem;
}
.pub{
  padding: .9rem 1rem;
  border-radius: var(--radius);
  border:1px solid rgba(36,50,71,.75);
  background: rgba(18,26,38,.35);
}
.pub__title{ font-weight:750; color: rgba(232,238,247,.92); }
.pub__meta{ color: var(--muted); font-size:.95rem; margin-top:.25rem; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding: .7rem 1rem;
  border-radius: 14px;
  border: 1px solid rgba(36,50,71,.85);
  font-weight: 750;
  text-decoration:none;
  cursor:pointer;
  transition: transform .12s ease, background .12s ease;
}
.btn:hover{ transform: translateY(-1px); text-decoration:none; }

.btn--primary{
  color: #041017;
  background: linear-gradient(135deg, rgba(102,227,196,1), rgba(122,167,255,1));
  border-color: rgba(102,227,196,.55);
}
.btn--ghost{
  color: rgba(232,238,247,.92);
  background: rgba(18,26,38,.35);
}
.btn--small{
  padding: .55rem .85rem;
  border-radius: 12px;
  background: rgba(18,26,38,.35);
  color: rgba(232,238,247,.92);
}

/* ---------- Footer ---------- */
.footer{
  margin-top: 2rem;
  padding: 2rem 0 2.2rem;
  border-top: 1px solid rgba(36,50,71,.55);
  background: rgba(7,10,15,.6);
}
.footer__grid{
  display:grid;
  grid-template-columns: 1.4fr .8fr .8fr;
  gap: 1.2rem;
}
.footer__brand{
  font-weight: 850;
  letter-spacing:-.02em;
}
.footer__text{ color: var(--muted); }
.small{ font-size:.92rem; }
.footer__links{
  display:flex;
  flex-direction:column;
  gap:.5rem;
}
.footer__links a{
  color: rgba(232,238,247,.85);
}
.footer__links a:hover{ color: var(--link); text-decoration:none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .hero__grid{ grid-template-columns: 1fr; }
  .footer__grid{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
  .grid--2{ grid-template-columns: 1fr; }

  .nav__toggle{ display:block; }
  .nav{
    position:absolute;
    right: 1rem;
    top: 72px;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:.3rem;
    width: min(320px, calc(100% - 2rem));
    background: rgba(15,21,32,.92);
    border:1px solid rgba(36,50,71,.85);
    border-radius: 16px;
    padding:.6rem;
    box-shadow: var(--shadow);
  }
  .nav a{ padding:.6rem .7rem; }
  .nav.is-open{ display:flex; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior:auto !important; }
  .tile, .btn{ transition:none !important; }
}