:root{
  --bg0:#070a12;
  --bg1:#0b1224;
  --card:#0f1a33cc;
  --line:#1e2b55;
  --text:#eaf0ff;
  --muted:#a9b4d6;
  --aqua:#35f2ff;
  --violet:#8b5cff;
  --gold:#ffd35a;
  --shadow: 0 20px 80px rgba(0,0,0,.55);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 20% 10%, rgba(53,242,255,.12), transparent 60%),
    radial-gradient(900px 500px at 80% 20%, rgba(139,92,255,.12), transparent 55%),
    radial-gradient(700px 500px at 50% 90%, rgba(255,211,90,.08), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  overflow-x:hidden;
}

/* HERO */
.hero{
  position:relative;
  min-height:92vh;
  display:grid;
  place-items:center;
  padding:64px 18px;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.hero::before{
  content:"";
  position:absolute; inset:-2px;
  background:
    repeating-linear-gradient(
      90deg,
      rgba(255,255,255,.04) 0px,
      rgba(255,255,255,.04) 1px,
      transparent 1px,
      transparent 90px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(255,255,255,.03) 0px,
      rgba(255,255,255,.03) 1px,
      transparent 1px,
      transparent 90px
    );
  opacity:.35;
  pointer-events:none;
  mask-image: radial-gradient(circle at 50% 25%, black 0 55%, transparent 75%);
}
.overlay{
  position:absolute; inset:0;
  background:
    radial-gradient(700px 500px at 50% 30%, rgba(53,242,255,.16), transparent 60%),
    radial-gradient(600px 420px at 52% 28%, rgba(139,92,255,.12), transparent 60%);
  pointer-events:none;
  filter: blur(.2px);
}
.hero-content{
  position:relative;
  width:min(980px, 100%);
  text-align:center;
  padding:46px 18px;
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(15,26,51,.75), rgba(15,26,51,.35));
  box-shadow: var(--shadow);
  border-radius:22px;
  backdrop-filter: blur(12px);
}
.hero-content::after{
  content:"";
  position:absolute; inset:-2px;
  border-radius:24px;
  background: linear-gradient(90deg, rgba(53,242,255,.35), rgba(139,92,255,.35), rgba(255,211,90,.25));
  z-index:-1;
  filter: blur(18px);
  opacity:.55;
}
h1{
  margin:0;
  letter-spacing:.14em;
  font-weight:800;
  font-size: clamp(2.1rem, 5vw, 3.6rem);
}
h2{
  margin:12px 0 0;
  font-weight:700;
  font-size: clamp(1.05rem, 2.6vw, 1.55rem);
  color: var(--aqua);
  text-transform: uppercase;
  letter-spacing:.18em;
}
.tagline{
  margin:18px auto 26px;
  max-width: 52ch;
  color: var(--muted);
  font-size: 1.02rem;
  line-height:1.6;
}

/* BUTTON */
#atlasBtn{
  appearance:none;
  border:none;
  cursor:pointer;
  padding:14px 18px;
  border-radius:14px;
  font-weight:800;
  letter-spacing:.08em;
  text-transform: uppercase;
  color: #071018;
  background: linear-gradient(90deg, var(--aqua), var(--violet));
  box-shadow: 0 18px 60px rgba(53,242,255,.12);
  transition: transform .12s ease, filter .12s ease;
}
#atlasBtn:active{ transform: translateY(1px) scale(.99); }
#atlasBtn:hover{ filter: brightness(1.06); }

/* SECTIONS */
section{
  width:min(1100px, 100%);
  margin:0 auto;
  padding:64px 18px;
}
.about h2, .atlas h2{
  margin:0 0 18px;
  color: var(--text);
  letter-spacing:.08em;
  text-transform: uppercase;
}
.cards{
  display:grid;
  gap:14px;
  grid-template-columns: repeat(12, 1fr);
}
.card{
  grid-column: span 12;
  padding:18px 16px;
  border-radius:16px;
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(15,26,51,.65), rgba(15,26,51,.35));
  box-shadow: 0 10px 40px rgba(0,0,0,.35);
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  inset:-40% -40%;
  background: radial-gradient(circle at 30% 30%, rgba(53,242,255,.14), transparent 60%),
              radial-gradient(circle at 70% 40%, rgba(139,92,255,.12), transparent 55%);
  transform: rotate(8deg);
  pointer-events:none;
}
.card h3{
  margin:0 0 10px;
  font-size: 1.05rem;
  letter-spacing:.06em;
}
.card p{
  margin:0;
  color: var(--muted);
  line-height:1.6;
}

.atlas{
  border-top:1px solid rgba(255,255,255,.06);
}
.atlas p{
  margin:0;
  color: var(--muted);
  line-height:1.8;
  font-size:1.03rem;
  max-width:70ch;
}

/* FOOTER */
footer{
  border-top:1px solid rgba(255,255,255,.06);
  padding:22px 18px;
  color: rgba(233,240,255,.70);
  text-align:center;
  font-size:.95rem;
}

/* RESPONSIVE */
@media (min-width: 780px){
  .card{ grid-column: span 4; }
}

/* ATLAS MODAL */
.atlas-modal{
  position:fixed;
  inset:0;
  display:none;
  place-items:center;
  padding:18px;
  background: rgba(0,0,0,.62);
  z-index:999;
}
.atlas-modal.open{ display:grid; }
.atlas-panel{
  width:min(720px, 100%);
  border-radius:18px;
  border:1px solid rgba(255,255,255,.12);
  background: linear-gradient(180deg, rgba(15,26,51,.88), rgba(15,26,51,.55));
  box-shadow: var(--shadow);
  overflow:hidden;
}
.atlas-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 14px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-weight:900;
  letter-spacing:.10em;
  text-transform:uppercase;
}
.badge-dot{
  width:10px; height:10px; border-radius:50%;
  background: var(--aqua);
  box-shadow: 0 0 18px rgba(53,242,255,.55);
}
.close-btn{
  border:none;
  background: transparent;
  color: rgba(233,240,255,.82);
  font-size: 22px;
  cursor:pointer;
  padding:4px 10px;
  border-radius:10px;
}
.close-btn:hover{ background: rgba(255,255,255,.06); }
.atlas-body{
  padding:14px;
}
.chat{
  height: 300px;
  overflow:auto;
  padding:12px;
  border:1px solid rgba(255,255,255,.08);
  border-radius:14px;
  background: rgba(7,10,18,.35);
}
.msg{
  margin:10px 0;
  display:flex;
  gap:10px;
  line-height:1.5;
}
.msg .who{
  min-width:64px;
  font-weight:800;
  letter-spacing:.05em;
  color: var(--aqua);
}
.msg.user .who{ color: var(--gold); }
.msg .text{ color: rgba(233,240,255,.88); }
.input-row{
  display:flex;
  gap:10px;
  margin-top:12px;
}
#atlasInput{
  flex:1;
  border-radius:12px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(7,10,18,.45);
  color: var(--text);
  padding:12px 12px;
  outline:none;
}
#atlasSend{
  border:none;
  cursor:pointer;
  border-radius:12px;
  padding:12px 14px;
  font-weight:900;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:#071018;
  background: linear-gradient(90deg, var(--gold), var(--aqua));
}