:root{--green:#4a9e72;--green-light:#e8f5ee;--green-dark:#2d7a55;--text:#333;--text-light:#666;--bg:#fafaf8;--white:#fff;--border:#e5e5e0;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg);color:var(--text);font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;font-size:16px;line-height:1.7}.site-header{background:var(--white);border-bottom:2px solid var(--green-light);z-index:10;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;max-width:800px;margin:0 auto;padding:1rem 1.5rem;display:flex}.site-title{color:var(--green-dark);font-size:1.25rem;font-weight:700;text-decoration:none}nav a{color:var(--text-light);font-size:.9rem;text-decoration:none}nav a:hover{color:var(--green)}.site-main{max-width:800px;min-height:calc(100vh - 140px);margin:0 auto;padding:2rem 1.5rem}.hero{background:linear-gradient(135deg, var(--green-light), #f0faf4);border-radius:var(--radius);text-align:center;margin-bottom:2.5rem;padding:2.5rem 2rem}.hero h1{color:var(--green-dark);margin-bottom:.75rem;font-size:1.8rem}.hero p{color:var(--text-light);font-size:.95rem}.posts-heading{color:var(--text-light);border-bottom:2px solid var(--green-light);margin-bottom:1rem;padding-bottom:.5rem;font-size:1.1rem;font-weight:600}.post-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:1rem;padding:1.5rem;text-decoration:none;transition:border-color .2s,box-shadow .2s;display:block}.post-card:hover{border-color:var(--green);box-shadow:0 2px 12px #4a9e721a}.post-card .post-date{color:var(--text-light);margin-bottom:.4rem;font-size:.8rem}.post-card .post-title{color:var(--text);margin-bottom:.5rem;font-size:1.1rem;font-weight:700;line-height:1.5}.post-card .post-excerpt{color:var(--text-light);font-size:.9rem;line-height:1.6}.post-tags{flex-wrap:wrap;gap:.4rem;margin-top:.75rem;display:flex}.tag{background:var(--green-light);color:var(--green-dark);border-radius:20px;padding:.2rem .6rem;font-size:.75rem}.post-header{border-bottom:2px solid var(--green-light);margin-bottom:2rem;padding-bottom:1.5rem}.post-header .post-date{color:var(--text-light);margin-bottom:.5rem;font-size:.85rem}.post-header h1{color:var(--text);margin-bottom:.75rem;font-size:1.6rem;line-height:1.5}.post-content{color:var(--text);font-size:1rem;line-height:1.9}.post-content p{margin-bottom:1.2rem}.back-link{color:var(--green);margin-bottom:1.5rem;font-size:.9rem;text-decoration:none;display:inline-block}.back-link:hover{text-decoration:underline}.site-footer{text-align:center;color:var(--text-light);border-top:1px solid var(--border);padding:1.5rem;font-size:.85rem}@media (max-width:600px){.hero h1{font-size:1.4rem}.post-header h1{font-size:1.3rem}}