:root{
  --bg:#f7f9fb; --card:#ffffff; --accent:#4257f5; --muted:#6b7280; --glass:rgba(255,255,255,0.6);
  --radius:14px; --shadow: 0 6px 20px rgba(20,20,50,0.06);
}
*{box-sizing:border-box}
body{font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial; margin:0; background:var(--bg); color:#0f172a}
.container{max-width:1100px;margin:0 auto;padding:28px}
.site-header{background:linear-gradient(90deg, #fff, #fbfdff);border-bottom:1px solid #e6eef7}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:700;color:var(--accent);text-decoration:none}
nav a{margin-left:18px;color:var(--muted);text-decoration:none}
.btn{background:var(--accent);color:#fff;padding:10px 14px;border-radius:10px;text-decoration:none;border:none;cursor:pointer}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn.big{padding:14px 22px;font-weight:600}
.hero{padding:60px 0}
.hero-grid{display:grid;grid-template-columns:1fr 380px;gap:26px;align-items:center}
.hero h1{font-size:40px;margin:0 0 14px}
.hero p{color:var(--muted);margin:0 0 18px}
.hero-card{background:var(--card);padding:18px;border-radius:16px;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center}
.hero-card img{max-width:100%;height:220px;object-fit:contain}
.featured h2{margin-top:10px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:18px}
.book-card{background:var(--card);padding:12px;border-radius:12px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.book-card img{height:200px;object-fit:cover;border-radius:8px}
.book-card h4{margin:10px 0 4px;font-size:16px}
.book-card p{margin:0;color:var(--muted);font-size:14px}
.how-it-works{margin-top:36px}
.features{display:flex;gap:18px}
.feature{background:var(--card);padding:18px;border-radius:12px;flex:1;box-shadow:var(--shadow)}
.site-footer{border-top:1px solid #e6eef7;padding:18px 0;margin-top:28px;background:transparent}
.search-bar{display:flex;gap:10px;align-items:center;margin:20px 0}
.search-bar input, select{padding:10px;border-radius:10px;border:1px solid #e6eef7;flex:1}
.form-card{background:var(--card);padding:18px;border-radius:12px;box-shadow:var(--shadow);display:grid;gap:12px}
.form-card label{display:flex;flex-direction:column;font-size:14px;color:var(--muted)}
.back{display:inline-block;margin:12px 0;color:var(--muted);text-decoration:none}
.detail-card{display:flex;gap:22px;background:var(--card);padding:18px;border-radius:12px;box-shadow:var(--shadow)}
.detail-card img{width:220px;height:320px;object-fit:cover;border-radius:8px}
.profile-card{display:flex;justify-content:space-between;align-items:center;background:var(--card);padding:16px;border-radius:12px;box-shadow:var(--shadow)}
.profile-stats{display:flex;gap:18px}
.profile-stats div{background:var(--glass);padding:10px;border-radius:10px;text-align:center}
@media(max-width:880px){.hero-grid{grid-template-columns:1fr}.features{flex-direction:column}.grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}}