*,:before,:after{box-sizing:border-box}body{color:#1a1a2e;background:#f8f9fa;min-height:100dvh;margin:0;font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif}.top-header{z-index:100;background:#fff;border-bottom:1px solid #e5e7eb;padding:14px 20px;position:sticky;top:0}.top-header-site{color:#3b82f6;font-size:1rem;font-weight:700;text-decoration:none}.top-main{max-width:860px;margin:0 auto;padding:24px 16px 48px}@media (width>=640px){.top-main{padding:40px 24px 64px}}.hero{background:#fff;border:1px solid #e5e7eb;border-radius:16px;margin-bottom:36px;padding:28px 24px}.hero-catch{color:#1a1a2e;margin:0 0 10px;font-size:1.2rem;font-weight:700;line-height:1.5}.hero-sub{color:#6b7280;margin:0;font-size:.875rem;line-height:1.7}@media (width>=640px){.hero{padding:36px 32px}.hero-catch{font-size:1.4rem}.hero-sub{font-size:.925rem}}.top-section{margin-bottom:32px}.section-label{color:#6b7280;text-transform:uppercase;letter-spacing:.06em;margin:0 0 12px;font-size:.75rem;font-weight:600}.card-grid{grid-template-columns:1fr;gap:12px;display:grid}@media (width>=640px){.card-grid{grid-template-columns:repeat(2,1fr)}}.card{color:inherit;background:#fff;border:1px solid #e5e7eb;border-radius:12px;flex-direction:column;padding:20px;text-decoration:none;transition:box-shadow .15s,border-color .15s;display:flex;box-shadow:0 1px 4px #0000000f}.card:hover{border-color:#3b82f6;box-shadow:0 4px 12px #3b82f61f}.card-tag{color:#3b82f6;background:#eff6ff;border-radius:4px;align-self:flex-start;margin-bottom:10px;padding:2px 8px;font-size:.7rem;font-weight:600;display:inline-block}.card-title{margin:0 0 6px;font-size:.975rem;font-weight:700}.card-desc{color:#6b7280;flex:1;margin:0;font-size:.825rem;line-height:1.6}.card-arrow{text-align:right;color:#3b82f6;margin-top:14px;font-size:1rem;display:block}.coming-soon{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.coming-soon-item{color:#9ca3af;background:#f3f4f6;border:1px solid #e5e7eb;border-radius:20px;padding:4px 14px;font-size:.8rem}.article-category{margin-bottom:28px}.article-category:last-child{margin-bottom:0}.category-title{color:#374151;border-left:3px solid #3b82f6;margin:0 0 10px;padding-left:10px;font-size:.8rem;font-weight:600}.coming-note{color:#9ca3af;margin:0;padding-left:13px;font-size:.8rem}.site-footer{text-align:center;background:#fff;border-top:1px solid #e5e7eb;padding:24px 20px}.footer-nav{flex-wrap:wrap;justify-content:center;gap:8px 20px;margin-bottom:12px;display:flex}.footer-nav a{color:#6b7280;font-size:.8rem;text-decoration:none}.footer-nav a:hover{color:#3b82f6;text-decoration:underline}.footer-copy{color:#9ca3af;margin:0;font-size:.75rem}.quiz-card{color:inherit;background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:20px;text-decoration:none;transition:box-shadow .15s,border-color .15s;display:block}.quiz-card:hover{border-color:#3b82f6;box-shadow:0 2px 8px #3b82f61f}.quiz-card-tag{color:#3b82f6;background:#eff6ff;border-radius:4px;margin-bottom:8px;padding:2px 8px;font-size:.7rem;font-weight:600;display:inline-block}.quiz-card h3{margin:0 0 6px;font-size:1rem;font-weight:700}.quiz-card p{color:#6b7280;margin:0;font-size:.85rem;line-height:1.5}.quiz-card-arrow{color:#3b82f6;justify-content:flex-end;margin-top:12px;font-size:1rem;display:flex}