:root{color-scheme:light;--brand:#33c9a6;--on-brand:#0b3b31;--ink:#1f2d27;--ink-2:#3c4f46;--muted:#4d5f56;--heading:#0b4a3d;--link:#167a63;--link-hover:#0e5a49;--bg:#fff;--surface:#fff;--tint:#e8f8f3;--tint-2:#f4faf8;--line:#dcefe8;--line-2:#c6e6da;--deep:#0b4a3d;--on-deep:#fff;--on-deep-2:#cfefe4;--warm:#fff8e8;--warm-line:#f1e0b5;--accent:#f6c453;--placeholder:#ddf2ea;--shadow:0 12px 40px #0b4a3d1a;--logo-chip:transparent;--font-body:"Noto Sans JP","Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;--font-head:"Zen Maru Gothic","Hiragino Maru Gothic ProN","Rounded Mplus 1c","Noto Sans JP",sans-serif;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}@media 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84px);-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);font-family:var(--font-body);margin:0;font-size:16px;line-height:1.8}body:before{content:"";height:env(safe-area-inset-top,0px);z-index:10;background:var(--surface);position:fixed;inset:0 0 auto}img{max-width:100%;height:auto;display:block}a{color:var(--link)}a:hover{color:var(--link-hover)}:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}h1,h2,h3{font-family:var(--font-head);color:var(--heading);margin:0;line-height:1.5}p{margin:0}.wrap{max-width:1160px;margin:0 auto;padding-inline:24px}.muted{color:var(--muted)}.btn{white-space:nowrap;cursor:pointer;min-height:52px;font-weight:700;font:inherit;text-align:center;border:0;border-radius:26px;justify-content:center;align-items:center;gap:8px;padding:0 28px;font-weight:700;line-height:1.3;text-decoration:none;display:inline-flex}.btn-primary{background:var(--brand);color:var(--on-brand)}.btn-primary:hover{color:var(--on-brand);filter:brightness(.96)}.btn-ghost{background:var(--surface);color:var(--heading);border:1.5px solid var(--heading)}.btn-ghost:hover{color:var(--heading);background:var(--tint)}.btn-deep{background:var(--deep);color:var(--on-deep)}.btn-sm{border-radius:22px;min-height:44px;padding:0 20px;font-size:14px}.icon-btn{border:1px solid var(--line-2);background:var(--surface);cursor:pointer;width:44px;height:44px;color:var(--heading);border-radius:22px;justify-content:center;align-items:center;display:inline-flex}.tag{color:var(--heading);background:var(--tint);border-radius:999px;align-self:flex-start;padding:3px 10px;font-size:12px;font-weight:700;line-height:1.6;display:inline-flex}.logo-h{background:var(--logo-chip);width:auto;height:13px;padding:var(--logo-pad,0);border-radius:4px}.dk{display:none!important}@media 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env(safe-area-inset-bottom,0px));grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid;position:fixed;bottom:0;left:0;right:0}.bottom-bar .btn{min-height:48px;padding:0 10px;font-size:14px}body{padding-bottom:76px}.hero .wrap{gap:28px;padding-block:36px 40px}.concept{padding:28px 20px}.helpbox,.schoolbox{padding:24px}.badge-row img{height:44px}.section{padding-block:44px}}dialog{background:var(--surface);width:min(560px,100vw - 32px);color:var(--ink);box-shadow:var(--shadow);border:0;border-radius:24px;padding:0}dialog::backdrop{background:#05191473}.search-in{flex-direction:column;gap:12px;padding:20px;display:flex}.search-in label{color:var(--heading);font-weight:700}.search-in input{border:1px solid var(--line-2);background:var(--bg);min-height:52px;color:var(--ink);font:inherit;border-radius:14px;padding:0 16px}.results{max-height:50vh;margin:0;padding:0 8px 8px;list-style:none;overflow:auto}.results li a,.results li span.r{color:var(--ink);border-radius:12px;justify-content:space-between;gap:12px;padding:12px;text-decoration:none;display:flex}.results li a:hover{background:var(--tint)}.results small{color:var(--muted);flex:none}.toast{left:50%;bottom:calc(96px + env(safe-area-inset-bottom,0px));background:var(--deep);color:var(--on-deep);z-index:50;opacity:0;pointer-events:none;border-radius:14px;max-width:calc(100vw - 32px);padding:12px 20px;font-size:14px;transition:opacity .2s;position:fixed;transform:translate(-50%)}.toast.show{opacity:1}@media (prefers-reduced-motion:reduce){.toast{transition:none}}.sr{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.article-card .thumb .article-image{object-fit:cover;width:100%;height:100%;margin:0}.article-card[hidden]{display:none}.skip-link{z-index:100;background:var(--surface);padding:12px;position:fixed;top:-100px}.skip-link:focus{top:0}.prose h2{margin-top:20px;scroll-margin-top:100px}.prose h3{margin-top:12px}.prose ul,.prose ol{margin-block:0}.toc{background:var(--tint-2);border-radius:20px;padding:22px 26px}.toc p{font-weight:700}.points ul{margin-bottom:0}.chip:is(a){align-items:center;text-decoration:none;display:inline-flex}.article-main header{flex-direction:column;gap:14px;display:flex}.eyecatch img{width:100%}.site-footer>.wrap:last-child{padding-top:0;font-size:12px}@media (width<=480px){.wrap{padding-inline:18px}.brand-name{font-size:15px}.header-actions{gap:6px}.icon-btn{width:38px;height:38px}.footer-brand .row{flex-wrap:wrap}.checklist-card{padding:24px}.article-layout{gap:24px}}