:root{
  --bg:#0b1220; --text:#e8eef7; --muted:#9fb0c8; --brand:#3aa7ff; --accent:#6ee7ff;
  --card:#121b2e; --border:#24324e;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.55}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1080px;margin:0 auto;padding:24px}
.row{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
nav{border-bottom:1px solid var(--border);position:sticky;top:0;background:rgba(11,18,32,.85);backdrop-filter: blur(6px);z-index:50}
.brand{font-weight:800;letter-spacing:.08em}
.brand span{color:var(--accent)}
.menu a{margin:0 8px;color:var(--text)}
.menu .btn{background:var(--brand);color:#041020;padding:10px 14px;border-radius:10px}
.hero{position:relative;overflow:hidden}
.hero .bg{position:absolute;inset:0;background:radial-gradient(1200px 500px at 20% -10%,rgba(58,167,255,.2),transparent),radial-gradient(1000px 600px at 80% 0,rgba(110,231,255,.15),transparent)}
.hero .container{position:relative;padding:64px 24px 24px}
.badge{display:inline-block;padding:6px 10px;border:1px solid var(--border);border-radius:999px;color:var(--muted);font-size:13px;margin-bottom:10px}
h1{font-size:42px;margin:8px 0 6px}
h2{font-size:28px;margin:8px 0 12px}
h3{margin:0 0 8px}
p.muted{color:var(--muted)}
.section{padding:32px 0}
.grid{display:grid;gap:16px}
.cols-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.card{background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,.00));border:1px solid var(--border);border-radius:14px;padding:18px}
.book-cover{width:100%;height:auto;border-radius:10px;border:1px solid var(--border)}
.button{display:inline-block;padding:12px 16px;border:1px solid var(--border);border-radius:12px}
.button.primary{background:var(--brand);color:#041020;border-color:transparent}
.actions{display:flex;gap:12px;flex-wrap:wrap}
footer{border-top:1px solid var(--border);margin-top:32px}
footer .social a{margin-right:10px}
.form .input{width:100%;padding:12px;border-radius:10px;border:1px solid var(--border);background:#0e1628;color:var(--text);margin:6px 0}
.form button{margin-top:6px}
.small{font-size:14px;color:var(--muted)}
hr.soft{border:none;border-top:1px solid var(--border);margin:18px 0}