*{box-sizing:border-box;padding:0;margin:0}:root{--primary:#1a56db;--text:#1f2937;--text-light:#6b7280;--border:#e5e7eb;--bg-light:#f9fafb;--max-width:780px}html{font-size:16px;line-height:1.7}body{font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Noto Sans JP,sans-serif;color:var(--text);background:#fff}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.header{background:#fff;border-bottom:2px solid var(--primary);padding:0 1rem;position:-webkit-sticky;position:sticky;top:0;z-index:100;box-shadow:0 2px 4px rgba(0,0,0,.05)}.header-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:60px}.site-title{font-size:1.1rem;font-weight:700;color:var(--text)}.site-title:hover{text-decoration:none;color:var(--primary)}.header-nav{display:flex;gap:1.5rem;font-size:.9rem}.main{max-width:var(--max-width);margin:0 auto;padding:2rem 1rem}.article-grid{display:grid;grid-gap:1.5rem;gap:1.5rem}.article-card{border:1px solid var(--border);border-radius:8px;padding:1.25rem;transition:box-shadow .2s;display:block}.article-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1);text-decoration:none}.article-card-category{font-size:.75rem;color:var(--primary);font-weight:600;margin-bottom:.5rem}.article-card-title{font-size:1.05rem;font-weight:700;color:var(--text);margin-bottom:.5rem;line-height:1.5}.article-card-date{font-size:.8rem;color:var(--text-light)}.article-header{margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border)}.article-category{display:inline-block;background:var(--primary);color:#fff;font-size:.75rem;font-weight:600;padding:.2rem .6rem;border-radius:4px;margin-bottom:.75rem}.article-title{font-size:1.6rem;font-weight:700;line-height:1.4;margin-bottom:.75rem}.article-meta{font-size:.85rem;color:var(--text-light)}.article-body{font-size:1rem;line-height:1.9}.article-body h2{font-size:1.3rem;font-weight:700;margin:2.5rem 0 1rem;padding:.5rem 0 .5rem .75rem;border-left:4px solid var(--primary);background:var(--bg-light)}.article-body h3{font-size:1.1rem;font-weight:700;margin:2rem 0 .75rem;padding-bottom:.3rem;border-bottom:1px solid var(--border)}.article-body p{margin-bottom:1.25rem}.article-body ol,.article-body ul{margin:1rem 0 1.25rem 1.5rem}.article-body li{margin-bottom:.5rem}.article-body table{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.9rem}.article-body th{background:var(--primary);color:#fff;padding:.6rem .75rem;text-align:left}.article-body td{padding:.6rem .75rem;border:1px solid var(--border)}.article-body tr:nth-child(2n) td,.author-box{background:var(--bg-light)}.author-box{border:1px solid var(--border);border-radius:8px;padding:1.25rem;margin:2.5rem 0}.author-name{font-weight:700;margin-bottom:.25rem}.author-credential{font-size:.8rem;color:var(--primary);font-weight:600;margin-bottom:.5rem}.author-bio{font-size:.9rem;color:var(--text-light)}.ad-notice{background:#fff8e1;border:1px solid #ffd54f;border-radius:4px;padding:.5rem .75rem;font-size:.8rem;color:#795548;margin-bottom:1.5rem}.footer{border-top:1px solid var(--border);margin-top:4rem;padding:2rem 1rem;text-align:center;font-size:.85rem;color:var(--text-light)}.footer-nav{display:flex;justify-content:center;gap:1.5rem;margin-bottom:1rem;flex-wrap:wrap}@media (max-width:600px){.article-title{font-size:1.3rem}.header-nav{gap:1rem;font-size:.85rem}}