:root{--ink:#172c39;--muted:#566773;--teal:#087e82;--pale:#e8f6f4;--line:#dce6e9;--bg:#f7fafb}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,'Hiragino Kaku Gothic ProN','Yu Gothic',sans-serif;color:var(--ink);line-height:1.85;background:#fff}a{color:#08777e}a:hover{text-decoration:none}.wrap{max-width:1050px;margin:auto;padding:0 22px}.top{border-bottom:1px solid var(--line);background:#fff}.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:76px}.logo{font-size:1.3rem;font-weight:850;color:var(--ink);text-decoration:none}.logo span{color:var(--teal)}nav{display:flex;gap:20px;flex-wrap:wrap}nav a{font-size:.93rem;text-decoration:none;color:var(--ink)}.hero{background:linear-gradient(120deg,#e8f7f5,#f2f8fc);padding:76px 0 70px}.eyebrow{font-weight:700;color:var(--teal);letter-spacing:.08em;font-size:.83rem}.hero h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.45;margin:12px 0 18px}.hero p{max-width:700px;color:#405562;font-size:1.08rem}.btn{display:inline-block;background:var(--teal);color:white;padding:12px 24px;border-radius:9px;text-decoration:none;font-weight:700}.section{padding:58px 0}.section.alt{background:var(--bg)}h2{font-size:1.7rem;line-height:1.5;margin:0 0 12px}.lead{color:var(--muted);margin:0 0 27px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.card{border:1px solid var(--line);border-radius:14px;background:white;padding:24px;text-decoration:none;color:inherit;transition:transform .15s}.card:hover{transform:translateY(-3px);border-color:#91c9c8}.icon{font-size:2rem}.card h3{margin:12px 0 5px;font-size:1.1rem}.card p{font-size:.93rem;color:var(--muted);margin:0}.note{border-left:4px solid var(--teal);background:var(--pale);padding:17px 20px;border-radius:5px}.article{max-width:780px;margin:0 auto;padding:52px 22px 80px}.article h1{font-size:2.15rem;line-height:1.5}.article h2{margin-top:42px;padding-bottom:9px;border-bottom:2px solid var(--line)}.article h3{margin-top:28px}.article p,.article li{color:#334955}.article table{border-collapse:collapse;width:100%;margin:22px 0}.article th,.article td{border:1px solid var(--line);padding:12px;text-align:left}.article th{background:var(--bg)}.crumb{font-size:.84rem;color:var(--muted)}.tag{display:inline-block;color:var(--teal);background:var(--pale);border-radius:30px;padding:3px 12px;font-size:.8rem;font-weight:700}.footer{background:#172c39;color:#dce9ec;padding:35px 0}.footer a{color:#dce9ec}.footlinks{display:flex;gap:18px;flex-wrap:wrap;font-size:.88rem}.small{font-size:.82rem;color:#aebfc5;margin-top:24px}@media(max-width:720px){.nav{align-items:flex-start;flex-direction:column;padding:17px 0;gap:9px}nav{gap:13px}.hero{padding:50px 0}.grid{grid-template-columns:1fr}.section{padding:40px 0}.article h1{font-size:1.7rem}}

.tool{background:#f2faf9;border:1px solid #c9e5e3;border-radius:14px;padding:22px;margin:24px 0}.formgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.formgrid label{font-size:.91rem;font-weight:700}.formgrid input{display:block;width:100%;padding:12px;border:1px solid #adc6c8;border-radius:8px;font:inherit;margin-top:5px}.result{background:white;border:1px solid #dce6e9;border-radius:8px;padding:14px 17px;font-weight:700;margin-top:15px}.result.warning{border-color:#e6b06c;background:#fff7ec}.result.ok{border-color:#a0d5c7;background:#ecfaf4}.article .small{font-size:.83rem;color:#566773}.article ol,.article ul{padding-left:1.5em}.article a{overflow-wrap:anywhere}@media(max-width:600px){.formgrid{grid-template-columns:1fr}.tool{padding:16px}}

/* v5: lightweight illustrations and comparison UI */
.hero-layout{position:relative;min-height:330px;padding-right:min(44%,410px)}.hero-illustration{position:absolute;right:10px;top:12px;width:40%;max-width:390px;height:auto;border-radius:18px;filter:drop-shadow(0 8px 16px rgba(8,95,104,.12))}.category-image{display:block;width:100%;height:138px;object-fit:cover;border-radius:10px;margin-bottom:10px}.guide-image{display:block;width:100%;height:122px;object-fit:cover;border-radius:10px;margin-bottom:15px}.article-visual{margin:22px 0 28px}.article-visual img{display:block;width:100%;max-height:285px;object-fit:contain;border-radius:14px;background:#e8f6f4}.article-visual figcaption{text-align:center;font-size:.78rem;color:#647781;margin-top:7px}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}.compare-grid section{background:white;border:1px solid var(--line);border-radius:12px;padding:18px}.compare-grid label{display:block;font-size:.87rem;font-weight:700;margin:12px 0}.compare-grid input,.tool select{display:block;width:100%;padding:10px;border:1px solid #adc6c8;border-radius:8px;font:inherit;margin-top:5px}.compare-grid h3{margin-top:0}.card{overflow:hidden}@media(max-width:720px){.hero-layout{padding-right:22px}.hero-illustration{position:static;display:block;width:100%;max-width:330px;margin:28px auto 0}.compare-grid{grid-template-columns:1fr}.category-image{height:160px}}

/* Product decision tables */
.compare-table-wrap{overflow-x:auto;margin:1.3rem 0 2rem;border:1px solid #d9e6e7;border-radius:12px}
.compare-table{border-collapse:collapse;width:100%;min-width:540px;background:white}
.compare-table th,.compare-table td{padding:14px 16px;border-bottom:1px solid #e1ebec;text-align:left;vertical-align:top;line-height:1.7}
.compare-table th{background:#eaf5f5;color:#183d44;font-weight:700}
.compare-table tr:last-child td{border-bottom:0}

/* v8: 検索導線と読みやすさ */
.breadcrumbs{font-size:.87rem;color:#506477;margin:0 0 20px;line-height:1.7}.breadcrumbs a{color:#176e82}.related-articles{margin-top:40px;padding:22px 25px;background:#eff8f8;border:1px solid #cde7e7;border-radius:14px}.related-articles h2{margin-top:0;font-size:1.3rem}.related-articles li{margin:10px 0}.related-articles a{color:#075e78;text-decoration:underline;text-underline-offset:3px}

/* v9: 全カテゴリ展開 */
.category-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.category-card{padding:21px}.category-card .icon{font-size:2.4rem}.topic-banner{display:flex;align-items:center;gap:22px;padding:25px 30px;border-radius:16px;background:linear-gradient(125deg,#e5f6f3,#eaf0fc);margin:24px 0}.topic-banner span{font-size:4.5rem;line-height:1}.topic-banner strong{display:block;font-size:1.2rem}.topic-banner small{display:block;color:#526777}.section-intro{margin:28px 0 18px;color:#526777}@media(max-width:720px){.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:480px){.category-grid{grid-template-columns:1fr}.topic-banner{padding:18px}.topic-banner span{font-size:3rem}}