/* Sticky Header Mobile Friendly */
.header-wrapper { position: sticky; top: 0; z-index: 1000; padding: 10px; background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); }
.header-content { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.logo-area img { max-height: 35px; }
/* Navigasi Swipe Mobile */
.nav-menu-list { display: flex; flex-wrap: nowrap; overflow-x: auto; gap: 5px; -webkit-overflow-scrolling: touch; padding: 5px 0; width: 100%; justify-content: flex-start; }
.nav-menu-list::-webkit-scrollbar { display: none; }
.nav-menu-list li { white-space: nowrap; }
.nav-menu-list a { font-size: 0.85rem; padding: 8px 12px; background: #f1f5f9; border-radius: 50px; }
/* Content Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 15px; }
.main-layout { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 20px; }
/* Card Buku */
.book-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.premium-card { background: white; border-radius: var(--radius); padding: 10px; border: 1px solid var(--border); }
.cover-wrapper { padding-top: 140%; position: relative; overflow: hidden; border-radius: 12px; margin-bottom: 10px; }
.cover-wrapper img { position: absolute; width: 100%; height: 100%; object-fit: cover; }
@media (min-width: 768px) {
.header-content { flex-direction: row; }
.nav-menu-list { overflow-x: visible; justify-content: center; }
.main-layout { grid-template-columns: 2.5fr 1fr; }
.book-grid { grid-template-columns: repeat(3, 1fr); }
}
