:root{--teal:#075f69;--teal2:#0b7780;--pale:#edf7f6;--gold:#b78b36;--ink:#183037;--muted:#617279;--line:#dbe7e5;--white:#fff;--shadow:0 14px 40px rgba(22,66,69,.09)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#f6faf9;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;line-height:1.85}
a{color:var(--teal)}
.hero{background:linear-gradient(135deg,#073f45 0%,#075f69 64%,#157d80 100%);color:#fff;padding:54px 24px 66px;position:relative;overflow:hidden;border-top:6px solid var(--gold)}
.hero:after{content:"";position:absolute;width:380px;height:380px;border:1px solid rgba(255,255,255,.16);border-radius:50%;right:-120px;top:-170px}
.hero .inner,.layout{max-width:1180px;margin:auto}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.04em}
.brand img{width:42px;height:42px;object-fit:contain;filter:brightness(0) invert(1)}
.screen-guide{display:grid;gap:32px;margin:32px 0}.screen-guide figure{margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;box-shadow:0 10px 28px rgba(22,66,69,.10)}.screen-guide img{display:block;width:100%;height:auto;background:#f7f6f2}.screen-guide figcaption{position:relative;padding:38px 22px 20px;color:#334e53;line-height:1.85;background:linear-gradient(135deg,#edf7f6 0%,#f7fbfa 100%);border-top:3px solid var(--teal)}.screen-guide figcaption:before{content:"画面の説明";position:absolute;top:10px;left:22px;color:var(--teal);font-size:11px;font-weight:800;letter-spacing:.12em}.screen-guide figcaption b{display:block;margin-bottom:7px;color:#183f45;font-size:1.05rem}
@media (max-width:720px){.screen-guide{gap:24px;margin:24px 0}.screen-guide figcaption{padding:35px 16px 16px}.screen-guide figcaption:before{left:16px}.screen-guide figure{border-radius:10px}}
.eyebrow{display:inline-block;margin-top:42px;padding:5px 12px;border:1px solid rgba(255,255,255,.4);border-radius:99px;font-size:13px;font-weight:700}
.hero h1{font-size:clamp(32px,5vw,52px);line-height:1.28;margin:14px 0 12px;letter-spacing:.02em}
.hero p{max-width:680px;margin:0;color:#e1f2f1;font-size:17px}
.quick{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.quick a{color:#fff;text-decoration:none;padding:10px 15px;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.24);border-radius:10px;font-size:14px;font-weight:700}
.layout{display:block;padding:38px 24px 80px}
.toc{position:static;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:30px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.toc>strong{grid-column:1/-1;display:block;color:var(--teal);font-size:14px;margin:0}
.toc-group,.toc-group:first-of-type{margin:0;padding:15px;border:1px solid var(--line);border-radius:12px;background:#f8fbfa}
.toc-group strong{display:block;padding:0 5px 5px;color:#8a6c30;font-size:11px;letter-spacing:.08em}
.toc a{display:block;text-decoration:none;color:#40575d;font-size:14px;padding:5px;border-radius:8px}
.toc a:hover{background:var(--pale);color:var(--teal)}
main{width:100%;min-width:0}
.intro,.chapter{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.intro{padding:26px 28px;margin-bottom:28px}
.intro h2{margin:0 0 7px;font-size:23px}
.plan-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:18px}
.plan-item{background:var(--pale);border-radius:12px;padding:13px;font-size:13px;overflow-wrap:anywhere}
.plan-item b{display:block;color:var(--teal);font-size:15px}
.chapter{padding:34px;margin:0 0 24px;scroll-margin-top:20px}
.num{color:var(--gold);font-weight:900;font-size:13px;letter-spacing:.12em}
.chapter h2{margin:2px 0 10px;font-size:28px;line-height:1.45}
.lead{color:var(--muted);margin:0 0 22px}
.support-callout{margin:22px 0 26px;padding:20px 22px;background:linear-gradient(135deg,#edf7f6 0%,#f8fbfa 100%);border:1px solid #c8dfdc;border-radius:14px}.support-callout>span{display:block;color:var(--teal);font-size:12px;font-weight:800;letter-spacing:.1em}.support-callout h3{margin:2px 0 7px;color:#183f45;font-size:20px}.support-callout p{margin:0;color:#40575d}.support-callout ul{margin:9px 0 10px;padding-left:1.4em;color:#40575d;font-size:14px}.support-callout a{font-weight:800}
.steps{counter-reset:step;display:grid;gap:12px;margin:18px 0}
.step{position:relative;padding:15px 16px 15px 58px;background:#f8fbfa;border:1px solid var(--line);border-radius:12px;overflow-wrap:anywhere}
.step:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:15px;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--teal);color:#fff;font-weight:800;line-height:1}
.step>b:first-child{display:block;margin:-2px 0 9px;padding-bottom:7px;border-bottom:1px solid #cbdedb;color:var(--teal);font-size:1.04rem;font-weight:800}
.step p{margin:7px 0}.key-rule{font-weight:800;text-decoration:underline;text-decoration-color:var(--gold);text-decoration-thickness:2px;text-underline-offset:4px}.key-list{margin:12px 0;padding:0;list-style:none;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.key-list li{padding:11px 2px;background:transparent}.key-list li+li{border-top:1px solid var(--line)}.key-list strong{display:block;margin-bottom:2px;color:#183f45}.key-note{padding:11px 13px;background:#f5f1e8;border-radius:8px}.key-note>strong{display:block;color:#765a24}
.note>b:first-child,.warning>b:first-child{font-weight:800;text-decoration:underline;text-underline-offset:3px}
.note,.warning{padding:15px 17px;border-radius:12px;margin:17px 0;font-size:14px}
.note{background:#f5f1e8;border-left:4px solid var(--gold)}
.warning{background:#fff4ed;border-left:4px solid #d56835}
.footer{padding:30px 24px;text-align:center;color:#6d7e82;font-size:13px;border-top:1px solid var(--line)}
@media(max-width:850px){.layout{padding:24px 14px 60px}.toc{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:18px}.chapter{padding:25px 20px}.plan-grid{grid-template-columns:1fr 1fr}.hero{padding:38px 20px 46px}.hero .quick{display:none}.chapter h2{font-size:23px}}
@media(max-width:520px){.toc,.plan-grid{grid-template-columns:1fr}.hero h1{font-size:30px}.intro{padding:22px 20px}.step{padding-right:14px}}
@media print{.hero{padding:24px;background:#fff;color:var(--ink);border-bottom:2px solid var(--teal)}.hero p{color:var(--muted)}.quick,.toc{display:none}.layout{padding:20px}.chapter,.intro{box-shadow:none;break-inside:avoid}.footer{display:none}}