body { font-family: 'Poppins', Arial, sans-serif; margin: 0; color: #333; background: #fff; }
header, footer { background: #0F4C81; color: #fff; padding: 15px 0; }
.header-flex { display: flex; justify-content: space-between; align-items: center; }
.logo-area { display: flex; align-items: center; text-decoration: none; color: #fff; }
img.logo { height: 50px; margin-right: 12px; }
.logo-text h2 { margin: 0; font-size: 1.1rem; }
.logo-text span { font-size: 0.75rem; opacity: 0.8; }
nav a { color: #fff; margin: 0 12px; text-decoration: none; font-weight: 500; opacity: 0.8; }
nav a:hover, nav a.active { opacity: 1; border-bottom: 2px solid #f7941d; }
.container { max-width: 1100px; margin: auto; padding: 0 20px; box-sizing: border-box; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 25px; }
.card { border: 1px solid #ddd; padding: 20px; border-radius: 8px; background: #fff; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.book { width: 100%; height: 280px; background: #e9ecef; display: flex; align-items: center; justify-content: center; border-radius: 6px; color: #666; font-weight: bold; }
.hero-section { background: linear-gradient(rgba(15,76,129,0.9), rgba(15,76,129,0.95)); color: #fff; padding: 100px 0; }
.hero-section h1 span { color: #f7941d; }
.btn-cta { background: #f7941d; color: #fff; padding: 12px 25px; text-decoration: none; border-radius: 5px; font-weight: 600; display: inline-block; }
.btn-secondary { background: transparent; color: #fff; padding: 11px 24px; text-decoration: none; border-radius: 5px; border: 1px solid #fff; display: inline-block; }
.page-title-section { background: #f8f9fa; padding: 50px 0; border-bottom: 1px solid #eee; }
.page-title-section h1 span { color: #0F4C81; }
.page-content { padding: 60px 20px; }
.about-grid, .detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 768px) { .header-flex { flex-direction: column; gap: 15px; } .about-grid, .detail-grid { grid-template-columns: 1fr; } }
.image-placeholder { background: #0F4C81; height: 300px; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: bold; }
.book-info h3 { margin: 15px 0 10px; color: #0F4C81; }
.btn-detail { display: block; text-align: center; background: #f8f9fa; color: #0F4C81; border: 1px solid #0F4C81; padding: 8px; margin-top: 15px; border-radius: 5px; text-decoration: none; font-weight: 500; }
.btn-detail:hover { background: #0F4C81; color: #fff; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; padding-bottom: 20px; }
.copyright { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; font-size: 0.85rem; opacity: 0.7; }
.detail-table { width: 100%; border-collapse: collapse; margin: 15px 0; }
.detail-table td { padding: 8px 0; }
.category-badge { background: #e1f5fe; color: #0288d1; padding: 4px 12px; border-radius: 50px; font-size: 0.8rem; font-weight: 600; }