:root{--color-bg: #ffffff;--color-text: #1a202c;--color-muted: #64748b;--color-accent: #c2410c;--color-accent-soft: #fff7ed;--color-border: #e2e8f0;--max-width: 760px;--color-ink: #0b1a2b;--color-ink-soft: #13253b;--color-ink-line: rgba(148, 197, 255, .14);--color-ink-text: #e7edf5;--color-ink-muted: #93a4bd}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Hiragino Kaku Gothic ProN,Noto Sans JP,-apple-system,BlinkMacSystemFont,Inter,system-ui,sans-serif;background-color:var(--color-bg);color:var(--color-text);line-height:1.8;font-variant-numeric:tabular-nums;background-image:linear-gradient(#eef2f7 1px,transparent 1px),linear-gradient(90deg,#eef2f7 1px,transparent 1px);background-size:32px 32px}a{color:var(--color-accent)}.container{max-width:var(--max-width);margin:0 auto;padding:0 1rem}main.container{background:var(--color-bg);position:relative}main.container--wide{max-width:1040px}@media(min-width:900px){main.container{margin-top:1.5rem;margin-bottom:1.5rem;padding-top:1px;padding-bottom:2rem;border-left:1px solid var(--color-border);border-right:1px solid var(--color-border);box-shadow:0 12px 32px -20px #0b1a2b59}}.site-header{background:var(--color-ink);border-bottom:2px solid var(--color-accent);padding:1rem 0}.site-header .container{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:.5rem}.site-title{display:inline-flex;align-items:baseline;gap:.15rem;font-size:1.3rem;font-weight:700;letter-spacing:.06em;color:var(--color-ink-text);text-decoration:none}.site-title:before{content:"";display:inline-block;width:.5rem;height:.5rem;margin-right:.5rem;background:var(--color-accent);transform:rotate(45deg)}.site-title-ja{margin-left:.5rem;font-size:.8rem;font-weight:500;letter-spacing:normal;color:var(--color-ink-muted)}.site-nav a{margin-left:1.25rem;font-size:.9rem;color:var(--color-ink-muted);text-decoration:none}.site-nav a:hover{color:var(--color-ink-text)}.site-footer{background:var(--color-ink);color:var(--color-ink-muted);margin-top:4rem;padding:2.5rem 0;font-size:.85rem;background-image:linear-gradient(var(--color-ink-line) 1px,transparent 1px),linear-gradient(90deg,var(--color-ink-line) 1px,transparent 1px);background-size:28px 28px}.site-footer a{color:var(--color-ink-muted)}.site-footer a:hover{color:var(--color-ink-text)}.site-hero{background:var(--color-ink);color:var(--color-ink-text);padding:5rem 0 4rem;background-image:linear-gradient(var(--color-ink-line) 1px,transparent 1px),linear-gradient(90deg,var(--color-ink-line) 1px,transparent 1px);background-size:32px 32px;position:relative;overflow:hidden}.site-hero:after{content:"";position:absolute;right:-60px;bottom:-60px;width:260px;height:260px;border:1px solid var(--color-ink-line);border-radius:50%}.site-hero h1{font-size:2.75rem;font-weight:800;letter-spacing:-.01em;line-height:1.05;margin-bottom:1rem}.site-hero .site-hero-ja{font-size:1.1rem;font-weight:500;letter-spacing:normal;color:var(--color-ink-muted);margin-left:.85rem}.site-hero p{max-width:38em;color:var(--color-ink-muted);font-size:1rem;line-height:1.85}.site-hero .hero-rule{width:2.5rem;height:2px;background:var(--color-accent);margin-bottom:1.5rem}.fleet-illustration{display:block;width:100%;max-width:640px;height:auto;margin-top:2rem;color:var(--color-ink-muted)}@media(max-width:600px){.fleet-illustration{margin-top:1.5rem}}.article-card{display:flex;gap:1rem;align-items:flex-start;padding:1.25rem;margin-bottom:.85rem;border:1px solid var(--color-border);border-radius:10px;background:var(--color-bg);text-decoration:none;color:inherit;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.article-card:hover{transform:translateY(-2px);box-shadow:0 8px 20px -8px #0b1a2b40;border-color:var(--color-accent)}.article-card:hover h2{color:var(--color-accent)}.article-card__thumb{flex:0 0 190px;overflow:hidden;border-radius:6px;background:#f1f5f9}.article-card__thumb img{display:block;width:100%;height:auto;aspect-ratio:16 / 9;object-fit:cover;transition:transform .25s ease}.article-card:hover .article-card__thumb img{transform:scale(1.04)}.article-card__body{min-width:0}.article-card h2{font-size:1.1rem;margin-bottom:.25rem}.article-card p{font-size:.9rem;color:var(--color-muted)}@media(max-width:600px){.site-hero{padding:2.5rem 0 2rem}.site-hero h1{font-size:1.5rem}.article-card{gap:.75rem;padding:.85rem}.article-card__thumb{flex-basis:110px}.article-card h2{font-size:1rem}.article-card p{display:none}}.article-meta{font-size:.8rem;color:var(--color-muted);display:flex;gap:.75rem;align-items:center;margin-bottom:.35rem}.category-badge{background:var(--color-accent-soft);color:var(--color-accent);border-radius:4px;padding:.1rem .5rem;font-size:.75rem;font-weight:600;text-decoration:none}a.category-badge:hover{background:var(--color-accent);color:#fff}.breadcrumb{font-size:.8rem;color:var(--color-muted);padding:1.25rem 0 0}.breadcrumb a{color:var(--color-muted)}.breadcrumb a:hover{color:var(--color-accent)}.category-nav{display:flex;flex-wrap:wrap;gap:.5rem;padding-bottom:1rem;border-bottom:1px solid var(--color-border)}.category-nav a{font-size:.85rem;padding:.2rem .7rem;border:1px solid var(--color-border);border-radius:999px;color:var(--color-muted);text-decoration:none}.category-nav a:hover{border-color:var(--color-accent);color:var(--color-accent)}.tag-list{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:2rem}.tag-chip{font-size:.8rem;color:var(--color-muted);text-decoration:none}.tag-chip:hover{color:var(--color-accent)}.prose h1{font-size:1.8rem;font-weight:800;line-height:1.35;letter-spacing:-.01em;margin:1.5rem 0 1rem}.prose h2{font-size:1.4rem;font-weight:700;margin:3.5rem 0 1rem;padding-bottom:.4rem;border-bottom:2px solid var(--color-accent-soft)}.prose h3{font-size:1.1rem;font-weight:700;margin:2rem 0 .6rem}.prose p,.prose ul,.prose ol{margin-bottom:1rem}.prose ul,.prose ol{padding-left:1.5rem}.table-scroll{overflow-x:auto;margin-bottom:1.25rem;border:1px solid var(--color-border);border-radius:8px;-webkit-overflow-scrolling:touch}.table-scroll:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.prose table{border-collapse:separate;border-spacing:0;width:max-content;min-width:100%;margin-bottom:0;font-size:.9rem}.prose th,.prose td{border-right:1px solid var(--color-border);border-bottom:1px solid var(--color-border);padding:.5rem .75rem;text-align:left;vertical-align:top;background:var(--color-bg);min-width:7em;max-width:18em}.prose tr>*:last-child{border-right:none}.prose tr:last-child>*{border-bottom:none}.prose th{background:#f8fafc;white-space:nowrap}.prose td:first-child,.prose th:first-child{position:sticky;left:0;z-index:2;min-width:8em}.prose th:first-child{z-index:3}@media(max-width:600px){.prose table{font-size:.85rem}.prose th,.prose td{padding:.45rem .6rem;min-width:6em;max-width:13em}.prose th:first-child,.prose td:first-child{min-width:7em;max-width:10em}}.prose img,.hero-figure img{display:block;width:100%;height:auto;border-radius:8px}.hero-figure,.prose figure{margin:1.5rem 0 2rem}.hero-figure figcaption,.prose figcaption{margin-top:.5rem;font-size:.78rem;color:var(--color-muted);line-height:1.6}.prose p>img[src*=chart],.prose p>img[src*=steps]{border:1px solid var(--color-border)}.sources-box{margin-top:3rem;padding:1rem 1.25rem;background:#f8fafc;border:1px solid var(--color-border);border-radius:8px;font-size:.85rem}.sources-box h2{font-size:.95rem;border:none;margin:0 0 .5rem}.article-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:2.5rem;align-items:start;padding-bottom:2rem}@media(min-width:960px){.article-layout{grid-template-columns:minmax(0,1fr) 260px}.article-sidebar{position:sticky;top:1.5rem}}.article-sidebar{display:flex;flex-direction:column;gap:1.25rem}.sidebar-card{border:1px solid var(--color-border);border-radius:8px;background:#f8fafc;padding:1rem 1.1rem}.sidebar-card__title{font-size:.78rem;font-weight:700;letter-spacing:.04em;color:var(--color-muted);margin-bottom:.7rem;display:flex;align-items:center;gap:.4rem}.sidebar-card__title:before{content:"";width:.4rem;height:.4rem;background:var(--color-accent);transform:rotate(45deg);flex-shrink:0}.toc-list,.related-list{list-style:none;display:flex;flex-direction:column;gap:.6rem}.toc-list a,.related-list a{font-size:.85rem;line-height:1.5;color:var(--color-muted);text-decoration:none}.toc-list a:hover,.related-list a:hover{color:var(--color-accent)}.toc-list li{counter-increment:toc;display:flex;gap:.5rem}.toc-list{counter-reset:toc}.toc-list li:before{content:counter(toc);flex-shrink:0;font-variant-numeric:tabular-nums;color:var(--color-accent);font-size:.8rem;font-weight:700}.sidebar-card .category-badge{display:inline-block}.dashboard-table{border-collapse:collapse;width:100%;font-size:.9rem}.dashboard-table th,.dashboard-table td{border:1px solid var(--color-border);padding:.5rem .75rem}.stat-row{display:flex;gap:1rem;flex-wrap:wrap;margin:1.5rem 0}.stat-tile{flex:1;min-width:150px;border:1px solid var(--color-border);border-radius:8px;padding:1rem}.stat-tile .label{font-size:.8rem;color:var(--color-muted)}.stat-tile .value{font-size:1.5rem;font-weight:700}