:root{--paper:#f5f2e9;--card:#fffdf6;--ink:#263e36;--muted:#65746a;--line:#d6d9cb;--green:#294e40;--red:#b85639;--yellow:#e6c77c;--blue:#769195;--serif:"Yu Mincho","Hiragino Mincho ProN",Georgia,serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 "Yu Gothic UI",Meiryo,system-ui,sans-serif}a{color:inherit;text-underline-offset:4px}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #c9824e;outline-offset:4px}.wrap{width:min(1180px,calc(100% - 64px));margin:auto}.site-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 0;border-bottom:1px solid 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var(--green)}.note-item .note-num{font:italic 26px var(--serif);color:var(--red)}.note-item h3{font:500 19px/1.6 var(--serif)}.note-item p{font-size:13px;color:var(--muted)}.note-item a{font-size:12px}.about-band{padding:43px 45px;background:var(--green);color:#f5f2e5;display:grid;grid-template-columns:1fr 1.1fr;gap:55px;margin:15px 0 65px}.about-band h2{font:500 28px/1.7 var(--serif);margin:5px 0}.about-band p{font-size:13px;line-height:2.1}.about-band a{font-size:12px}.site-footer{border-top:1px solid var(--line);padding:30px 0 40px;display:flex;justify-content:space-between;gap:25px;align-items:start}.footer-links{display:flex;gap:22px;font-size:11px;flex-wrap:wrap}.copyright{font-size:10px;letter-spacing:.14em;color:var(--muted);margin:15px 0 0}.article-wrap{width:min(820px,calc(100% - 64px));margin:45px auto 75px}.breadcrumbs{font-size:11px;color:var(--muted);margin-bottom:34px}.article-wrap h1{font:500 clamp(31px,4vw,45px)/1.6 var(--serif);letter-spacing:.02em;margin:15px 0 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.chip{text-decoration:none}.search-form{display:flex;width:min(350px,100%);gap:6px}.search-form .search{flex:1}.search-form button{padding:8px 12px;border:1px solid var(--green);background:var(--green);color:white;font-size:12px}.pagination{display:flex;gap:10px;justify-content:center;margin:30px 0;font-size:13px}.page-numbers{padding:6px 12px;border:1px solid var(--line);text-decoration:none}.page-numbers.current{background:var(--green);color:white}.article-prose h2{font:600 24px/1.6 var(--serif);margin:38px 0 18px;padding-bottom:13px;border-bottom:1px solid var(--line)}.article-prose p{font-size:15px;line-height:2.2}.article-prose ul{padding-left:23px;font-size:14px;line-height:2.1}.article-prose .shoka-ad{padding:18px 23px;background:#ece9dc;font-size:12px}.article-prose .shoka-purchase{display:inline-block;background:var(--green);color:#fff;padding:12px 20px;text-decoration:none}

/* Reading guides: an earlier choice and a short answer before the book details. */
.hero-guide{grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);padding:38px 0 32px}
.hero-guide h1{font-size:clamp(35px,4.8vw,59px);line-height:1.42;margin:11px 0 17px}
.hero-guide p{max-width:37em;margin:0}
.hero-guide .hero-visual{width:min(100%,390px);justify-self:center}
.problem-chooser .chapter-label{font-size:15px;letter-spacing:.03em;color:var(--ink);margin:0}
.problem-chooser .intent-grid{margin:12px 0 44px}
.problem-chooser .intent small{display:block;margin:4px 0 0;font-size:12px;line-height:1.55;letter-spacing:0}
.book-value{margin:10px 0 26px;padding:20px 24px;background:#e8ecdf;border-left:3px solid var(--green)}
.book-value h2{margin:0 0 10px;font:600 22px/1.5 var(--serif)}
.book-value p{margin:8px 0 0;font-size:15px;line-height:1.9}
.book-value .book-value-title{margin:0 0 4px;font-size:14px;font-weight:700;color:var(--green)}
.book-value-audience strong,.book-value-example strong{display:block;color:var(--green);font-size:12px;line-height:1.6}
.book-value-example{border-top:1px solid #cdd6c5;padding-top:10px}
@media(max-width:650px){
  .hero-guide{grid-template-columns:1fr;padding:25px 0 29px}
  .hero-guide h1{font-size:clamp(29px,7.8vw,43px)}
  .hero-guide .hero-visual{display:none}
  .problem-chooser .intent-grid{margin-bottom:36px}
  .problem-chooser .intent{padding:13px 17px}
  .book-value{padding:16px 17px}
  .book-value h2{font-size:20px}
  .book-value p{font-size:14px}
}