:root{
    --bg:#080b12;
    --text:#f8fafc;
    --muted:#b6c2d1;
    --accent:#38bdf8;
    --accent2:#a78bfa;
    --border:rgba(255,255,255,.12);
}

*{
    box-sizing:border-box;
}

body{
    margin:0;
    font-family:Segoe UI, Arial, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(56,189,248,.18), transparent 35%),
        radial-gradient(circle at top right, rgba(167,139,250,.16), transparent 30%),
        var(--bg);
    color:var(--text);
    line-height:1.6;
}

nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    max-width:1150px;
    margin:0 auto;
    padding:24px 22px;
}

.logo{
    font-weight:800;
    letter-spacing:.08em;
    text-transform:uppercase;
}

.navlinks a{
    margin-left:22px;
    color:var(--muted);
    text-decoration:none;
}

.navlinks a:hover{
    color:var(--text);
}

.hero{
    max-width:1150px;
    margin:0 auto;
    padding:80px 22px 60px;
    display:grid;
    grid-template-columns:1.2fr .8fr;
    gap:40px;
    align-items:center;
}

.badge{
    display:inline-block;
    border:1px solid var(--border);
    color:var(--accent);
    padding:7px 12px;
    border-radius:999px;
    font-size:.85rem;
    margin-bottom:20px;
}

.hero h1{
    font-size:clamp(3rem,7vw,6rem);
    line-height:.95;
    margin:0 0 20px;
}

.hero p{
    color:var(--muted);
    font-size:1.2rem;
}

.hero-card{
    background:linear-gradient(145deg,#1e293b,#0f172a);
    border:1px solid var(--border);
    border-radius:24px;
    padding:30px;
}

.book-title{
    font-size:2rem;
    margin:0 0 8px;
}

.series{
    color:var(--accent);
    font-weight:700;
}

.button-row{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    margin-top:24px;
}

.button{
    display:inline-block;
    padding:12px 18px;
    background:linear-gradient(135deg,var(--accent),var(--accent2));
    color:#000;
    text-decoration:none;
    border-radius:10px;
    font-weight:700;
}

.button.secondary{
    background:#1e293b;
    color:white;
    border:1px solid var(--border);
}

.section{
    max-width:1150px;
    margin:0 auto;
    padding:40px 22px;
}

.section h2{
    font-size:2rem;
}

.grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
}

.card{
    background:#111827;
    border:1px solid var(--border);
    border-radius:20px;
    padding:24px;
}

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

.contact-email{
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
}

.contact-email:hover{
    color: var(--accent);
}

footer{
    max-width:1150px;
    margin:40px auto 0;
    padding:30px 22px;
    border-top:1px solid var(--border);
    color:#94a3b8;
    display:flex;
    justify-content:space-between;
}

@media(max-width:850px){
    .hero{
        grid-template-columns:1fr;
    }

    .grid{
        grid-template-columns:1fr;
    }

    footer{
        flex-direction:column;
    }

    .navlinks a{
        margin-left:0;
        margin-right:16px;
    }
}