:root{--accent:#d14a29;--accent2:#176b87;--ink:#342119;--pale:#fff0ea;--paper:#fff;--muted:#5f6b78;--line:#dbe3ea;--shadow:0 18px 50px rgba(18,35,55,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:#f7f9fb;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;line-height:1.8;font-size:16px}a{color:var(--accent);text-underline-offset:3px}img,svg{max-width:100%}.wrap{width:min(1160px,calc(100% - 36px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.header-inner{display:flex;align-items:center;gap:24px;min-height:68px}.brand{font-weight:900;color:var(--ink);text-decoration:none;letter-spacing:-.03em}.brand b{color:var(--accent)}nav{display:flex;gap:18px;margin-left:auto;align-items:center}nav a{font-weight:700;color:var(--ink);text-decoration:none;font-size:.92rem}.menu{display:none}.hero{background:linear-gradient(135deg,var(--pale),#fff 55%,color-mix(in srgb,var(--accent2) 12%,#fff));border-bottom:1px solid var(--line);padding:70px 0 52px}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:46px;align-items:start}.eyebrow{color:var(--accent);font-size:.78rem;font-weight:900;letter-spacing:.16em;margin:0 0 12px}.hero h1,.page-head h1{font-size:clamp(2.1rem,5vw,4.35rem);line-height:1.08;letter-spacing:-.055em;margin:.1em 0 .35em}.hero h1 span{color:var(--accent)}.lead{font-size:1.08rem;color:#425066;max-width:46rem}.proof-list{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:26px 0}.proof-list div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px}.proof-list b{display:block;font-size:1.15rem}.proof-list small{color:var(--muted)}.tool{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow)}.tool h2{font-size:1.35rem;margin:0 0 4px}.tool .sub{margin:0 0 18px;color:var(--muted);font-size:.94rem}.fields{display:grid;grid-template-columns:1fr 1fr;gap:12px}.fields label{font-weight:750;font-size:.88rem}.input-wrap{display:flex;align-items:center;border:1px solid #c8d2dc;border-radius:10px;background:#fff;margin-top:5px;overflow:hidden}.input-wrap input{width:100%;border:0;padding:11px 10px;font:inherit;min-width:0}.input-wrap span{padding:0 10px;color:var(--muted);white-space:nowrap}.results{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}.result{padding:13px;background:var(--pale);border-radius:12px}.result span{display:block;font-size:.78rem;color:var(--muted)}.result b{font-size:1.15rem}.note{font-size:.82rem;color:var(--muted)}.section{padding:64px 0}.section.white{background:#fff}.section h2{font-size:clamp(1.6rem,3vw,2.45rem);line-height:1.25;letter-spacing:-.035em;margin:0 0 12px}.section-intro{color:var(--muted);max-width:48rem;margin-bottom:28px}.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.flow-step{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}.flow-step b{display:block;color:var(--accent);font-size:.78rem;margin-bottom:8px}.flow-step:not(:last-child):after{content:"";position:absolute;right:-15px;top:50%;width:15px;border-top:2px solid var(--accent2)}.diagram-shell{background:linear-gradient(145deg,var(--ink),color-mix(in srgb,var(--ink) 72%,var(--accent)));color:#fff;border-radius:24px;padding:30px;overflow:hidden}.diagram-shell h2{color:#fff}.diagram-shell p{color:#dbe5ef}.diagram-shell .flow-step{color:var(--ink)}.comparison{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}.comparison th,.comparison td{padding:14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}.comparison th{background:var(--pale);font-size:.88rem}.comparison tr:last-child td{border-bottom:0}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 8px 24px rgba(18,35,55,.05)}.card .tag{display:inline-block;background:var(--pale);color:var(--accent);font-size:.76rem;font-weight:800;padding:3px 9px;border-radius:999px}.card h3{line-height:1.4;margin:12px 0 8px}.card p{color:var(--muted);font-size:.94rem}.card a{font-weight:800}.cta{background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 68%,var(--accent2)));color:#fff;border-radius:22px;padding:28px;margin:30px 0}.cta h2,.cta p{color:#fff}.cta a{display:inline-block;background:#fff;color:var(--accent);font-weight:900;text-decoration:none;border-radius:12px;padding:13px 18px}.disclosure{font-size:.8rem;color:#dbe5ef;margin-top:10px}.page-head{background:var(--pale);padding:60px 0 38px;border-bottom:1px solid var(--line)}.page-head h1{font-size:clamp(2rem,5vw,3.7rem);max-width:900px}.breadcrumbs{font-size:.84rem;color:var(--muted);margin-bottom:18px}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 260px;gap:46px;align-items:start}.article{background:#fff;border:1px solid var(--line);border-radius:20px;padding:clamp(24px,5vw,54px)}.article h2{font-size:1.65rem;line-height:1.35;margin-top:2.2em}.article h3{font-size:1.2rem;margin-top:1.7em}.answer{background:var(--pale);border-left:5px solid var(--accent);padding:20px;border-radius:10px;margin:24px 0}.formula{background:var(--ink);color:#fff;padding:20px;border-radius:14px;font-weight:800;margin:20px 0}.checklist{list-style:none;padding:0}.checklist li{padding:10px 0 10px 30px;border-bottom:1px solid var(--line);position:relative}.checklist li:before{content:"✓";position:absolute;left:4px;color:var(--accent);font-weight:900}.warning{background:#fff7e6;border:1px solid #f3d69b;border-radius:14px;padding:20px}.step-diagram{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:24px 0}.step-diagram div{background:var(--pale);padding:14px 10px;border-radius:12px;text-align:center;font-weight:750;font-size:.86rem}.step-diagram b{display:block;color:var(--accent)}.toc{position:sticky;top:90px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.toc b{display:block;margin-bottom:10px}.toc a{display:block;text-decoration:none;color:var(--muted);font-size:.87rem;padding:6px 0}.source-list{font-size:.9rem}.source-list li{margin:7px 0}.site-footer{background:#111d2b;color:#d6deea;padding:42px 0 28px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}.site-footer a{color:#fff}.site-footer small{color:#9dabbc}.updated{font-size:.82rem;color:var(--muted)}.mobile-scroll{overflow:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:820px){.hero-grid,.article-layout{grid-template-columns:1fr}.hero{padding-top:42px}.proof-list,.cards{grid-template-columns:1fr}.flow{grid-template-columns:1fr 1fr}.flow-step:after{display:none}.toc{position:static}.header-inner{flex-wrap:wrap;padding:10px 0}.menu{display:block;margin-left:auto;border:0;background:var(--pale);padding:8px 10px;border-radius:8px}nav{display:none;width:100%;margin:0;flex-wrap:wrap;padding-bottom:8px}nav.open{display:flex}.step-diagram{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}}@media(max-width:520px){.fields,.results,.flow{grid-template-columns:1fr}.wrap{width:min(100% - 24px,1160px)}.article{padding:22px}.hero h1{font-size:2.35rem}.comparison{min-width:680px}}