:root{
  --bg:#0b1020;
  --bg-elev:#0f1630;
  --panel:#111936;
  --muted:#9fb0d0;
  --text:#e6edf7;
  --primary:#2563eb; /* blue */
  --accent:#10b981;  /* green */
  --ring:rgba(37,99,235,.4);
  --shadow: 0 10px 30px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.03);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(37,99,235,.18), transparent 60%),
    radial-gradient(1200px 600px at 20% 10%, rgba(16,185,129,.14), transparent 60%),
    linear-gradient(180deg, #0b1020 0%, #0c1224 100%);
  min-height:100dvh;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

img{max-width:100%;display:block;border-radius:12px}

.container{width:min(1120px, 92vw); margin-inline:auto}
.section{padding:80px 0}
.section.alt{background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0) 40%); backdrop-filter:saturate(110%)}
.section.focus{
  background:
    radial-gradient(800px 400px at 10% 10%, rgba(37,99,235,.18), transparent 60%),
    radial-gradient(800px 400px at 90% 10%, rgba(16,185,129,.16), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0) 60%);
  border-block:1px solid rgba(255,255,255,.06);
}

h1,h2,h3{line-height:1.2;margin:0 0 12px}
h1{font-size: clamp(32px, 4vw, 48px); letter-spacing:-.02em}
h2{font-size: clamp(24px, 3vw, 32px)}
h3{font-size: clamp(18px, 2.2vw, 22px); color: #d7e4ff}
p{margin:0 0 14px;color:var(--muted)}
.section-intro{margin-top:-6px;margin-bottom:28px}

a{color:#cfe0ff;text-decoration:none}
a:hover{color:#eaf1ff}

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:12px 16px; border-radius:12px;
  border:1px solid rgba(255,255,255,.12); color:var(--text);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  transition:.2s ease;
}
.btn:hover{transform:translateY(-1px); border-color:rgba(255,255,255,.22)}
.btn.primary{
  background: linear-gradient(180deg, #2b6af0, #2159d0);
  border-color: rgba(33,89,208,.8);
  color:white;
  text-shadow:0 1px 0 rgba(0,0,0,.2);
}
.btn.primary:hover{filter:brightness(1.05)}
.btn.ghost{background:transparent}
.btn.full{width:100%}

/* Skip link */
.skip-link{
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip-link:focus{
  left:16px; top:12px; width:auto; height:auto; padding:10px 14px; z-index:1000;
  background:#0b122a; border:1px solid var(--primary); border-radius:10px; color:white;
}

/* Header */
.site-header{
  position:sticky; top:0; z-index:50;
  background: rgba(11,16,32,.65);
  backdrop-filter: blur(10px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.header-inner{display:flex; align-items:center; justify-content:space-between; padding:14px 0}
.brand{display:flex; align-items:center; gap:10px; font-weight:700; color:white}
.logo{
  display:grid; place-items:center;
  width:36px; height:36px; border-radius:10px;
  background: radial-gradient(120% 120% at 30% 20%, #4f8bff, #1a3e99);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.22), 0 6px 18px rgba(37,99,235,.35);
  font-weight:800;
}
.wordmark{font-size:18px; letter-spacing:.2px}

.nav ul{display:flex; gap:18px; list-style:none; margin:0; padding:0}
.nav a{padding:8px 10px; border-radius:10px; color:#d8e7ff}
.nav a.cta{background:rgba(37,99,235,.16); border:1px solid rgba(37,99,235,.4)}
.nav a:hover{background:rgba(255,255,255,.06)}

/* Mobile nav */
.nav-toggle{
  display:none; width:42px; height:42px; border-radius:10px; border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.03); color:inherit
}
.nav-toggle .bar{display:block; width:20px; height:2px; background:#e6edf7; margin:4px auto; border-radius:2px}
@media (max-width:840px){
  .nav-toggle{display:inline-block}
  .nav{position:absolute; right:16px; top:62px; width:min(92vw, 360px); display:none}
  .nav.open{display:block}
  .nav ul{flex-direction:column; gap:8px; background:#0d1430; border:1px solid rgba(255,255,255,.08); border-radius:14px; padding:12px; box-shadow: var(--shadow)}
}

/* Hero */
.hero{padding:80px 0 40px}
.hero-inner{display:grid; grid-template-columns:1.1fr .9fr; gap:32px; align-items:center}
.hero-copy p{font-size:18px}
.hero-actions{display:flex; gap:12px; margin-top:12px}

/* Sibling content container inside .hero-media */
.hero-media{
  position:relative;
  display:grid;
  grid-template-columns:1fr;
}
@media (min-width:961px){
  .hero-media{
    display:grid;
    grid-template-columns:1fr; /* stack content over illustration; adjust to 2 cols if you want side-by-side inside the box */
  }
}
.hero-content{
  position:absolute;
  inset:16px;
  z-index:2;
  display:grid;
  align-content:flex-start;
  gap:10px;
  padding:10px;
  pointer-events:auto;
}
.hero-title{font-size:clamp(18px,2.2vw,22px); color:#eaf1ff; margin:0}
.hero-subtitle{margin:0; color:#cfe0ff}
.btn.small{padding:8px 12px; font-size:14px; border-radius:10px}
.hero-content .btn.small{
  background: rgba(11,16,32,.9);
  color: #e6edf7;
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(4px);
}

.hero-illustration{
  position:relative; aspect-ratio:1.1/1; background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0));
  border:1px solid rgba(255,255,255,.06); border-radius:20px; overflow:hidden; box-shadow: var(--shadow)
}
.hero-illustration::after{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(80% 60% at 30% 20%, rgba(37,99,235,.16), transparent 60%),
              radial-gradient(80% 60% at 80% 80%, rgba(16,185,129,.12), transparent 70%);
  pointer-events:none;
}
.circle{position:absolute; border-radius:50%; filter:blur(20px); opacity:.7}
.c1{width:220px; height:220px; background:#2558f066; top:12%; left:10%}
.c2{width:260px; height:260px; background:#10b98155; bottom:6%; right:8%}
.c3{width:160px; height:160px; background:#6ee7b755; bottom:40%; left:50%}

.book-card{
  position:absolute; inset:auto; left:50%; top:50%; transform:translate(-50%,-50%) rotate(-6deg);
  width:68%; height:56%; border-radius:18px;
  background: linear-gradient(135deg, #0f1a3e, #0e214f);
  border:1px solid rgba(255,255,255,.08);
  box-shadow: 0 12px 30px rgba(0,0,0,.45), inset 0 1px 0 rgba(255,255,255,.06);
}
.book-card .spine{
  position:absolute; left:0; top:0; bottom:0; width:16%;
  background: linear-gradient(180deg, #19306f, #132153);
  border-right:1px solid rgba(255,255,255,.08);
  border-top-left-radius:18px; border-bottom-left-radius:18px;
}
.book-card .page{
  position:absolute; right:8%; top:12%; width:64%; height:74%;
  background: linear-gradient(180deg, #f7fafc, #e8eef7);
  border-radius:10px; box-shadow: 0 8px 16px rgba(0,0,0,.25)
}
.book-card .page.p2{right:10%; top:16%; width:62%; height:70%; opacity:.9}
.book-card .page.p3{right:12%; top:20%; width:60%; height:66%; opacity:.8}

/* Two columns */
.two-col{display:grid; grid-template-columns:1fr 1fr; gap:32px}
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
}

/* Keypoints */
.keypoints{display:grid; gap:14px}
.kp{display:flex; gap:12px; align-items:flex-start; background:rgba(255,255,255,.02); border:1px solid rgba(255,255,255,.06); padding:14px; border-radius:14px}
.kp-icon{font-size:22px}

/* Cards */
.cards{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
@media (max-width:1100px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.cards{grid-template-columns:1fr}}
.card{
  padding:18px; border-radius:16px;
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.06); box-shadow: var(--shadow)
}
.card-icon{font-size:26px; margin-bottom:6px}

/* Stats */
.stats{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
@media (max-width:960px){.stats{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.stats{grid-template-columns:1fr}}
.stat{
  text-align:center; padding:18px; border-radius:16px;
  background:linear-gradient(180deg, rgba(37,99,235,.08), rgba(255,255,255,0));
  border:1px solid rgba(37,99,235,.28)
}
.stat .num{font-size:34px; font-weight:800; color:white}
.stat .label{color:var(--muted); font-size:14px}

/* Projects */
.grid{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
@media (max-width:1100px){.grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.grid{grid-template-columns:1fr}}
.project{border:1px solid rgba(255,255,255,.06); border-radius:16px; overflow:hidden; background:rgba(255,255,255,.02); box-shadow: var(--shadow)}
.project-body{padding:14px}

/* Get Involved */
.list{padding-left:18px; color:var(--muted)}
.actions{display:flex; gap:10px; flex-wrap:wrap}
.form-card{display:grid; gap:12px}
label{display:grid; gap:6px; font-size:14px}
input, select{
  padding:12px 12px; border-radius:12px; border:1px solid rgba(255,255,255,.12);
  background:rgba(3,8,26,.6); color:var(--text);
  outline:none; transition:border .15s, box-shadow .15s;
}
input:focus, select:focus{border-color: var(--primary); box-shadow:0 0 0 4px var(--ring)}
.form-msg{min-height:20px}

/* Contact */
.contact{display:grid; grid-template-columns:1.1fr .9fr; gap:16px}
@media (max-width:900px){.contact{grid-template-columns:1fr}}
.note{background: linear-gradient(180deg, rgba(16,185,129,.08), rgba(255,255,255,0)); border:1px solid rgba(16,185,129,.28)}

/* Footer */
.site-footer{
  padding:36px 0 46px; border-top:1px solid rgba(255,255,255,.06);
  background:rgba(0,0,0,.15)
}
.footer-inner{display:grid; gap:12px; justify-items:center; text-align:center}
.brandline{display:flex; align-items:center; gap:10px}
.site-footer nav{display:flex; gap:14px; flex-wrap:wrap; justify-content:center}
.site-footer a{color:#c9d8ff}
.site-footer a:hover{color:#ffffff}

/* Utilities */
.card.form-card, .card.note{padding:18px}