:root{--color-primary:#1a4d2e;--color-primary-light:#2d7a4a;--color-accent:#d4a843;--color-bg:#faf9f6;--color-surface:#ffffff;--color-text:#333333;--color-text-light:#666666;--color-border:#e5e5e5;--color-success:#16a34a;--color-error:#dc2626;--max-width:1080px;--header-height:64px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;color:var(--color-text);background:var(--color-bg);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-light)}img{max-width:100%;height:auto}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.shop-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);height:var(--header-height);position:-webkit-sticky;position:sticky;top:0;z-index:100}.shop-header .container{display:flex;align-items:center;justify-content:space-between;height:100%}.shop-logo{font-size:1.1rem;font-weight:700;color:var(--color-primary)}.shop-logo small{display:block;font-size:.65rem;font-weight:400;color:var(--color-text-light)}.shop-nav{display:flex;gap:24px;align-items:center}.shop-nav a{font-size:.9rem;color:var(--color-text)}.shop-nav a:hover{color:var(--color-primary)}.cart-link{position:relative;font-size:1.2rem}.cart-badge{position:absolute;top:-6px;right:-10px;background:var(--color-error);color:#fff;font-size:.65rem;width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center}.shop-footer{background:var(--color-primary);color:rgba(255,255,255,.7);text-align:center;padding:32px 20px;margin-top:60px;font-size:.8rem}.shop-footer a{color:rgba(255,255,255,.9)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;border-radius:6px;font-size:.9rem;font-weight:600;border:none;cursor:pointer;transition:all .2s}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-light);color:#fff}.btn-accent{background:var(--color-accent);color:#fff}.btn-outline{background:transparent;border:1px solid var(--color-border);color:var(--color-text)}.btn-outline:hover{border-color:var(--color-primary);color:var(--color-primary)}.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:24px;gap:24px}.product-card{background:var(--color-surface);border-radius:8px;overflow:hidden;border:1px solid var(--color-border);transition:box-shadow .2s}.product-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.08)}.product-card-image{aspect-ratio:3/4;overflow:hidden;background:#f0ede6;display:flex;align-items:center;justify-content:center}.product-card-image img{width:100%;height:100%;object-fit:cover}.product-card-body{padding:16px}.product-card-title{font-size:.95rem;font-weight:600;line-height:1.4;margin-bottom:8px}.product-card-price{font-size:1.1rem;font-weight:700;color:var(--color-primary)}.product-card-price small{font-size:.75rem;font-weight:400;color:var(--color-text-light)}.product-card-badge{display:inline-block;padding:2px 8px;border-radius:3px;font-size:.7rem;font-weight:600;margin-bottom:8px}.badge-book{background:#e8f4fd;color:#1a73e8}.badge-exam{background:#fef3c7;color:#b45309}.badge-pdf{background:#fce4ec;color:#c62828}.section{padding:48px 0}.section-title{font-size:1.5rem;font-weight:700;margin-bottom:32px;text-align:center}.hero{background:linear-gradient(135deg,var(--color-primary) 0,#2d6a4f 100%);color:#fff;padding:60px 0;text-align:center}.hero h1{font-size:1.8rem;margin-bottom:12px}.hero p{font-size:1rem;opacity:.85;max-width:600px;margin:0 auto}.book-detail{display:grid;grid-template-columns:300px 1fr;grid-gap:40px;gap:40px;align-items:start}.book-detail-cover-wrap{background:#faf5ee;border-radius:8px;padding:20px;box-shadow:4px 4px 16px rgba(0,0,0,.08)}.book-detail-cover-wrap img{width:100%;height:auto;border-radius:4px}.book-detail-samples{display:flex;gap:8px;margin-top:12px}.book-detail-samples img{width:60px;height:80px;object-fit:cover;border-radius:4px;border:2px solid var(--color-border);cursor:pointer}.book-detail-title{font-size:1.5rem;font-weight:700;margin:12px 0 20px;line-height:1.4}.book-meta-table{width:100%;border-collapse:collapse;margin-bottom:24px}.book-meta-table th{text-align:left;padding:6px 16px 6px 0;font-size:.85rem;color:var(--color-text-light);white-space:nowrap;width:80px;vertical-align:top}.book-meta-table td{padding:6px 0;font-size:.9rem}.book-description{max-width:700px;margin:0 auto;font-size:.95rem;line-height:1.9}.book-description p{margin-bottom:16px}.book-buy-section{margin:24px 0}.btn-lg{padding:14px 32px;font-size:1rem}.book-external-links{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}.book-external-label{font-size:.8rem;color:var(--color-text-light);width:100%;margin-bottom:4px}.checkout-form{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:24px}.checkout-form h3{font-size:1rem;margin-bottom:16px}.form-group{margin-bottom:12px}.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:4px}.form-group input{width:100%;padding:10px 12px;border:1px solid var(--color-border);border-radius:6px;font-size:.95rem}.form-group input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(26,77,46,.1)}@media (max-width:768px){.product-grid{grid-template-columns:repeat(2,1fr);gap:12px}.hero h1{font-size:1.4rem}.shop-nav{gap:16px}.book-detail{grid-template-columns:1fr;gap:24px}.book-detail-cover-wrap{max-width:250px;margin:0 auto}}