* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #e8f4f8 0%, #d4e9f0 50%, #c9dfe8 100%);
    min-height: 100vh;
}
.header { background: #fff; padding: 1.5rem 0; position: relative; border-bottom: 1px solid #e5e7eb; }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; display: flex; justify-content: space-between; align-items: center; }
.nav-menu { display: flex; gap: 3rem; list-style: none; }
.nav-item { position: relative; }
.nav-link { text-decoration: none; color: #666; font-size: 0.85rem; font-weight: 700; position: relative; padding: 0.5rem 0; transition: color 0.3s ease; }
.nav-link:hover { color: #1a1a1a; }
.dropdown { position: absolute; top: 100%; left: 0; background: white; border: 1px solid #e5e7eb; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.1); min-width: 220px; opacity: 0; visibility: hidden; transform: translateY(-10px); transition: all 0.3s ease; z-index: 1000; padding: 1rem; }
.nav-item:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-link { display: block; padding: 0.8rem 1rem; color: #666; text-decoration: none; font-size: 0.9rem; transition: all 0.2s ease; border-radius: 8px; }
.dropdown-link:hover { color: #1a1a1a; background: #f8f9fa; }
@media (max-width: 900px) { .nav-container { flex-direction: column; align-items: flex-start; padding: 0 1rem; } .nav-menu { gap: 1.5rem; } }
.container { display: flex; min-height: 100vh; position: relative; }
.left-section { flex: 7; background: #f0f7fa; display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; padding: 0; }
.left-content { text-align: left; width: 100%; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; height: 100%; }
.main-title-left { position: static; text-align: left; margin-bottom: 1.5rem; width: 100%; }
.main-title-left .children { display: block; font-size: 80px; font-weight: 300; color: #333; line-height: 0.9; }
.main-title-left .health { display: block; font-size: 140px; font-weight: 300; color: #333; line-height: 0.8; }
.main-title-left .guide { display: block; font-size: 80px; font-weight: 300; color: #333; line-height: 0.9; }
.search-bar { margin: 2.5rem auto 2.5rem auto; display: flex; max-width: 700px; width: 100%; background: #fff; border-radius: 32px; box-shadow: 0 4px 24px rgba(0,0,0,0.10); }
.search-bar input[type="text"] { flex: 1; padding: 0.7rem 1.5rem; border: none; background: transparent; border-radius: 32px 0 0 32px; font-size: 1.15rem; outline: none; font-weight: 500; }
.search-bar button { padding: 0.7rem 2.2rem; border: none; background: #444; color: #fff; border-radius: 0 32px 32px 0; font-size: 1.1rem; cursor: pointer; font-weight: 700; letter-spacing: 0.03em; }
.footer-info { position: absolute; bottom: 120px; left: 40px; font-size: 18px; color: #666; text-align: left; }
.right-section { flex: 3; position: relative; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 40px; height: 100vh; }
.age-categories { display: flex; flex-direction: column; justify-content: center; align-items: center; height: 100%; width: 100%; position: relative; }
.age-category { margin-bottom: 12px; padding: 12px 16px; background: rgba(255,255,255,0.92); border-radius: 8px; font-size: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); width: 100%; max-width: 280px; }
.age-category h4 { font-size: 16px; margin-bottom: 5px; color: #333; }
.age-category p { font-size: 11px; color: #444; line-height: 1.4; }
@media (max-width: 768px) { .container { flex-direction: column; } .left-section, .right-section { flex: none; height: 50vh; } .nav-menu, .age-categories { position: static; transform: none; margin: 20px; } .main-title-left .children, .main-title-left .health, .main-title-left .guide { font-size: 40px; } .age-category { font-size: 16px; padding: 16px 10px; max-width: 100%; } .age-category h4 { font-size: 20px; } .age-category p { font-size: 14px; } }
.header-text { position: absolute; top: 20px; left: 40px; font-size: 16px; font-weight: bold; color: #666; line-height: 1.4; text-align: left; }
.content-block { background: #fff; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.04); padding: 2.5rem 2rem; margin-bottom: 2.5rem; max-width: 700px; }
.article-list { margin-top: 2rem; }
.article-item { background: #f8f8f8; border-radius: 8px; padding: 1.5rem; border-left: 4px solid #667eea; margin-bottom: 1.2rem; }
.article-item h4 { color: #667eea; margin-bottom: 0.5rem; }
.article-item p { color: #666; font-size: 0.9rem; }

/* Back Arrow */
.back-arrow {
    position: fixed;
    top: 30px;
    left: 30px;
    z-index: 1000;
    background: #222;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 20px;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}
.back-arrow:hover {
    background: #000;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}