:root{--ink:#304844;--green:#366c61;--muted:#586f69;--line:#b9cdc5;--paper:#fffefa;--wash:#f1f7f3}
*{box-sizing:border-box}html{scroll-behavior:smooth}body.chapter-toc{margin:0;background:#f6f5ee;color:var(--ink);font-family:"Hiragino Sans","Yu Gothic","Meiryo",system-ui,sans-serif;font-size:16px;line-height:1.8}
.toc-shell{width:min(960px,calc(100% - 40px));margin:0 auto}a{color:var(--green)}a:focus-visible{outline:3px solid #b66a3e;outline-offset:4px}.skip-link{position:absolute;top:-100px;left:20px;z-index:20;padding:12px;background:white}.skip-link:focus{top:12px}
.site-nav{display:flex;justify-content:center;margin:22px 0 18px}.site-nav a{background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:7px 25px;min-height:44px;text-decoration:none;font-size:14px}
.toc-hero{padding:32px 40px;border:1px solid var(--line);border-radius:24px;background:var(--paper);position:relative;overflow:hidden}.toc-hero:after{content:"";position:absolute;border:25px solid #edf4ee;border-radius:50%;width:170px;height:170px;right:-92px;top:-96px;pointer-events:none}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--green);margin:0 0 6px}h1{font-size:clamp(25px,4.6vw,34px);font-weight:600;letter-spacing:.04em;line-height:1.5;margin:0 0 14px}.hero-lead{max-width:740px;margin:0;color:var(--muted)}.hero-links{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 0}.hero-links a{display:inline-flex;align-items:center;min-height:44px;padding:6px 14px;border-radius:999px;background:var(--wash);text-decoration:none;font-size:14px}
.learning-route{margin:20px 0 30px;padding:21px 26px;border:1px solid #d7e4dd;border-radius:18px;background:#f9fcf8}.learning-route h2{font-size:16px;font-weight:600;margin:0 0 12px}.learning-route ol{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;padding:0;margin:0}.learning-route li{display:flex;gap:10px;align-items:flex-start;font-size:14px;line-height:1.7}.learning-route li>span{width:25px;height:25px;flex:0 0 25px;line-height:25px;text-align:center;border:1px solid var(--line);border-radius:50%;color:var(--green);font-size:12px}
.lesson-group{margin:0 0 28px}.lesson-group h2{font-size:18px;font-weight:600;margin:0 0 12px;display:flex;gap:12px;align-items:center}.lesson-group h2>span{font-size:12px;font-weight:400;color:var(--green);letter-spacing:.1em}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-card{display:flex;align-items:center;gap:15px;min-height:142px;padding:19px 17px;background:var(--paper);border:1px solid var(--line);border-radius:18px;text-decoration:none;transition:background .15s,border-color .15s}.lesson-card:hover{background:#f8fcf7;border-color:#749d8f}.lesson-art{flex:0 0 68px;width:68px;height:78px;border-radius:14px;background:var(--wash);display:flex;align-items:center;justify-content:center}.lesson-art svg{width:100%;height:100%;display:block}.lesson-copy{min-width:0;flex:1;display:flex;flex-direction:column;gap:5px}.lesson-meta{font-size:11px;letter-spacing:.05em;color:var(--muted);display:flex;gap:7px;align-items:center;flex-wrap:wrap}.level{font-size:10px;letter-spacing:0;padding:1px 7px;border-radius:999px;background:#eef4ee;color:var(--green)}.lesson-title{font-size:17px;line-height:1.6;font-weight:500;color:var(--ink)}.lesson-description{font-size:13px;color:var(--muted);line-height:1.8}.card-arrow{font-size:22px;color:#789a8e;flex:0 0 10px}
.chapter-check{padding:15px 20px;border-left:3px solid #80a192;margin:2px 0 28px;font-size:14px;background:#edf4ed;border-radius:0 12px 12px 0}.chapter-check strong{font-weight:600;color:var(--green)}.chapter-check p{margin:3px 0 0}
.print-entry{padding:26px 28px;background:var(--paper);border:1px solid var(--line);border-radius:20px;scroll-margin-top:20px}.print-entry h2{font-size:20px;font-weight:600;line-height:1.6;margin:0 0 10px}.print-entry>p:not(.eyebrow){font-size:14px;color:var(--muted);margin:8px 0 16px}.print-actions{display:flex;flex-wrap:wrap;gap:10px}.print-actions a{font-size:14px;padding:10px 16px;min-height:46px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:white}.print-actions a.primary{background:var(--green);color:white;border-color:var(--green)}.print-entry .print-note{font-size:12px!important;margin:14px 0 0!important}
.toc-footer{padding:24px 0 30px;text-align:center}.toc-footer nav{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.toc-footer a{font-size:13px;min-height:44px;padding:10px;text-decoration:none}.toc-footer p{font-size:11px;color:var(--muted);margin:10px 0 0}
@media(max-width:680px){.toc-shell{width:calc(100% - 24px)}.toc-hero{padding:26px 22px}.hero-lead{font-size:15px}.learning-route{padding:18px 20px}.learning-route ol{grid-template-columns:1fr;gap:12px}.lesson-grid{grid-template-columns:1fr}.lesson-card{min-height:124px}.lesson-art{flex-basis:62px;width:62px;height:74px}.print-entry{padding:23px 20px}.print-actions{flex-direction:column}.print-actions a{width:100%}.print-entry h2{font-size:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.lesson-card{transition:none}}
@media print{body.chapter-toc{background:white}.toc-shell{width:100%}.site-nav,.hero-links,.toc-footer{display:none}.toc-hero,.learning-route,.lesson-card,.print-entry{break-inside:avoid}.lesson-group{break-inside:avoid}.print-actions a{color:#304844!important;background:white!important}}