:root{
  --c-dark:#111418;
  --c-text:#222;
  --c-muted:#5b6770;
  --c-accent:#2aa9ff;
  --c-grad: linear-gradient(135deg,#9BE15D, #E6E338 40%, #38B6FF);
  --radius: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  color:var(--c-text); line-height:1.6; background:#f7f9fb;
}
a{color:#0b1220;text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* NAVBAR */
.navbar{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,0.96);
  backdrop-filter:blur(10px);
  border-bottom:1px solid #eef2f6;
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 0;
}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:700}
.nav-menu{
  list-style:none;margin:0;padding:0;
  display:flex;align-items:center;gap:16px;
}
.nav-menu a{font-weight:600;font-size:15px}
.nav-menu a:hover{color:#38B6FF}
.nav-toggle{
  display:none;background:none;border:none;
  font-size:26px;cursor:pointer;color:#111;
}

/* HERO */
.hero{
  position:relative;min-height:68vh;
  display:flex;align-items:center;
  background:linear-gradient(135deg,#f7ffe5,#e6f8ff);
}
.hero-inner{padding:80px 0}
.badge{
  display:inline-flex;gap:8px;align-items:center;
  background:#fff;border:1px solid #eaeef2;border-radius:999px;
  padding:8px 14px;box-shadow:var(--shadow);font-size:13px;
}
.badge .dot{width:8px;height:8px;border-radius:50%;background:var(--c-accent)}
.h1{font-size:44px;line-height:1.1;margin:14px 0 8px}
.p-lg{font-size:18px;color:var(--c-muted);max-width:720px}
.cta{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 18px;border-radius:12px;border:1px solid transparent;
  cursor:pointer;font-weight:600;box-shadow:var(--shadow);
  background:#fff;color:#0b1220;
}
.btn.primary{background:var(--c-grad);border:0;color:#0b1220}
.btn:hover{transform:translateY(-2px)}

/* SECTIONS */
.section{padding:56px 0}
.title{font-size:30px;margin:0 0 8px}
.subtitle{color:var(--c-muted);margin:0 0 22px}
.grid{display:grid;gap:18px}
.grid.cards{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{
  background:#fff;border:1px solid #eef2f6;
  border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);
}
.card h3{margin:6px 0 6px}
.card p{color:var(--c-muted);margin-top:4px}
.kv{display:grid;grid-template-columns:1.3fr .7fr;gap:24px;align-items:center}
.logo{height:42px;margin-bottom:10px}
.tag{
  display:inline-block;font-size:13px;padding:5px 10px;
  background:#eef7ff;border-radius:999px;margin:6px 6px 0 0;
}

/* BOOK CARDS */
.pub-grid{
  display:grid;gap:18px;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
}
.book-card{
  display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:flex-start;
  background:#fff;border:1px solid #eef2f6;border-radius:18px;padding:16px;box-shadow:var(--shadow);
}
.book-cover{
  width:120px;height:170px;border-radius:12px;
  background:linear-gradient(135deg,#9BE15D,#38B6FF);
  display:flex;align-items:center;justify-content:center;
  color:#0b1220;font-weight:800;text-align:center;padding:10px;
  font-size:14px;line-height:1.1;
}
.book-meta h3{margin:0 0 4px}
.book-cta{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}

.footer{
  padding:36px 0;border-top:1px solid #eaeef2;color:#44525e;
}
.small{font-size:14px;color:#6b7784}

/* Responsive */
@media(max-width:880px){
  .h1{font-size:34px}
  .kv{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .nav-menu{
    position:absolute;top:60px;left:0;width:100%;
    background:rgba(255,255,255,0.98);
    border-bottom:1px solid #eee;
    flex-direction:column;align-items:flex-start;
    padding:10px 20px;display:none;
  }
  .nav-menu.active{display:flex}
  .nav-menu li{width:100%;padding:7px 0}
  .nav-menu a{width:100%;font-size:15px}
  .book-card{grid-template-columns:1fr}
  .book-cover{width:100%;height:180px}
}

/* Dark mode */
body.dark{background:#05080c;color:#e3e9f2;}
body.dark .card,
body.dark .book-card{background:#111827;border-color:#273549;color:#e3e9f2;}
body.dark .navbar{background:rgba(15,23,42,0.97);border-color:#1f2937;}
body.dark a{color:#7bdcff;}
body.dark .btn{background:#111827;color:#e3e9f2;border-color:#273549;}
body.dark .btn.primary{
  background:linear-gradient(135deg,#38B6FF,#9BE15D);
  color:#020617;
}
body.dark .nav-menu{background:rgba(15,23,42,0.97);}
body.dark .nav-toggle{color:#f9fafb;}