/* 白い方眼を生かす中央寄せのワンカラム。スキル一覧だけ既存のグリッドを維持。 */
.ed-textbook.has-side .shell{margin-left:0}.ed-textbook.has-side .sidenav{display:none!important}
.ed-textbook .container{width:100%;max-width:1040px;margin:0 auto;padding:36px 24px 60px}
.ed-textbook.has-side .topnav{display:flex;max-width:none;padding:14px max(24px,calc((100vw - 992px)/2));gap:24px;align-items:center;flex-wrap:wrap;background:#fff}
.ed-textbook .member-nav .nav-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;border:1px solid var(--field-line);border-radius:9px;background:#fff;color:var(--ink);font:inherit;font-weight:700;padding:9px 16px;cursor:pointer}
.ed-textbook .member-nav .topnav-right{width:100%;flex-basis:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;overflow:visible;white-space:normal;margin:0}
.ed-textbook .member-nav .topnav-right[hidden]{display:none!important}.ed-textbook .member-nav .topnav-right a{padding:10px 14px;border-radius:8px;background:#fff5f8;min-height:44px;display:flex;align-items:center;margin:0}
.ed-textbook .member-nav .topnav-right .nav-sec{display:none}.ed-textbook .member-nav .topnav-right .nav-short{display:none}.ed-textbook .member-nav .topnav-right .nav-full{display:inline}
.ed-textbook .split,.ed-textbook .split.left,.ed-textbook .split.pg-lesson{display:block;grid-template-columns:1fr}
.ed-textbook .lesson-side{display:none!important}.ed-textbook .lesson{border:0;background:transparent;padding:0;border-radius:0;box-shadow:none}
.ed-textbook .lupinus-lecture-banner{border:0;border-radius:0;background:none;box-shadow:none;padding:18px 0 24px;margin:0;gap:24px}
.ed-textbook .lupinus-lecture-banner h1{background:none;color:var(--ink);font-size:clamp(25px,3vw,38px);line-height:1.55}
.ed-textbook .lupinus-lecture-banner img{width:110px;height:110px}.ed-textbook .hero{background:none;border:0;padding:12px 0 30px;text-align:left}.ed-textbook .hero-lead{font-size:18px}
.ed-textbook .course-grid{display:grid;grid-template-columns:1fr;gap:36px}.ed-textbook .course-card{background:none;border:0;border-radius:0;box-shadow:none;overflow:visible;display:block;text-decoration:none}
.ed-textbook .course-card:hover{box-shadow:none;transform:none}.ed-textbook .course-card img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;border-radius:12px}
.ed-textbook .course-card-body{padding:18px 0}.ed-textbook .course-card-body h2{color:var(--ink);font-size:24px;line-height:1.6}.ed-textbook .course-card-cta{background:none;border:0;padding:0 0 12px;color:var(--navy);font-weight:700;text-align:left}
.ed-textbook .course-card.course-main{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}.ed-textbook .course-main .course-card-body{padding:20px 4px}.ed-textbook .course-main .course-card-cta{padding-left:4px}
.ed-textbook .lupinus-course-toolbar{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:center;margin:0 0 32px;position:relative;z-index:3}
.ed-textbook .lupinus-inline-progress{min-width:0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:15px 20px}.ed-textbook .lupinus-inline-progress>div:first-child{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:10px;font-size:14px}.ed-textbook .lupinus-inline-progress b{color:var(--ink)}
.ed-textbook .lupinus-index-menu>summary{list-style:none;display:flex;gap:9px;align-items:center;justify-content:center;cursor:pointer;background:#fff;border:1px solid var(--field-line);border-radius:9px;min-height:54px;padding:12px 18px;font-weight:700;font-size:15px;color:var(--ink)}
.ed-textbook .lupinus-index-menu>summary::-webkit-details-marker{display:none}.ed-textbook .lupinus-index-menu[open]>summary{background:#fff2f6}.ed-textbook .lupinus-index-menu nav{position:absolute;right:0;top:calc(100% + 8px);background:#fff;border:1px solid var(--field-line);box-shadow:0 10px 30px #45363b18;border-radius:12px;padding:12px;width:min(460px,100%);max-height:65vh;overflow:auto}
.ed-textbook .lupinus-index-menu nav>a{display:flex;gap:10px;justify-content:space-between;text-decoration:none;color:var(--ink);min-height:46px;padding:10px 12px;border-radius:8px;font-size:15px}.ed-textbook .lupinus-index-menu nav>a:hover,.ed-textbook .lupinus-index-menu .is-current{background:#fff2f6}.ed-textbook .lupinus-index-menu .ls-group{margin-top:12px}
.ed-textbook .lesson-tiles{grid-template-columns:1fr;gap:24px;padding:0 24px 24px}.ed-textbook .lesson-tile h3{font-size:21px}.ed-textbook .lesson-thumb{max-height:none}.ed-textbook .chapter-accordion>summary{font-size:23px}.ed-textbook .lesson-tile-body{padding:20px 24px}
.ed-textbook .learning-roadmap,.ed-textbook .learning-progress-grid{grid-template-columns:1fr}.ed-textbook .lesson-step-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.ed-textbook .area-grid,.ed-textbook .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.ed-textbook .lupinus-social-confirm{background:#fff;border:2px solid var(--navy);border-radius:12px;padding:22px;margin:24px 0}.ed-textbook .lupinus-social-confirm h2{font-size:21px}.ed-textbook .social-account-row{display:flex;align-items:center;gap:14px;justify-content:space-between;flex-wrap:wrap;padding:18px 0;border-bottom:1px solid var(--line)}
@media(max-width:600px){.ed-textbook .container{padding:24px 18px 40px}.ed-textbook.has-side .topnav{padding:12px 18px;gap:12px}.ed-textbook .topnav .brand{max-width:calc(100% - 110px)}.ed-textbook .member-nav .topnav-right{grid-template-columns:1fr}.ed-textbook .lupinus-lecture-banner img{width:70px;height:90px}.ed-textbook .lupinus-lecture-banner h1{font-size:25px}.ed-textbook .course-main{padding:14px!important}.ed-textbook .course-card-body h2{font-size:21px}.ed-textbook .lupinus-course-toolbar{grid-template-columns:1fr;gap:10px}.ed-textbook .lupinus-index-menu>summary{min-height:44px;justify-content:flex-end;padding:8px 14px}.ed-textbook .lupinus-inline-progress{padding:14px}.ed-textbook .chapter-accordion>summary{font-size:19px}.ed-textbook .lesson-tiles{padding:0 14px 14px}.ed-textbook .lesson-tile-body{padding:16px}.ed-textbook .lesson-tile h3{font-size:18px}}

.ed-textbook .lesson-thumb{position:relative}.ed-textbook .lesson-thumb .lesson-thumb-chibi{position:absolute;right:2%;bottom:0;width:22%;height:auto;object-fit:contain;z-index:2}.ed-textbook .lesson-thumb-fallback{z-index:0}.ed-textbook .lesson-thumb>img:not(.lesson-thumb-chibi){position:relative;z-index:1}.ed-textbook .course-card.course-main{overflow:hidden}.ed-textbook .home-areas{grid-template-columns:repeat(2,minmax(0,1fr))}

body.ed-textbook.has-side{padding-left:0}.ed-textbook .lesson-thumb .lesson-thumb-chibi{top:auto;left:auto;right:2%;bottom:0}.ed-textbook .container:has(.lib-grid){max-width:1440px}

.ed-textbook .home-tools-grid{grid-template-columns:1fr}.ed-textbook .lupinus-badge-grid,.ed-textbook .lupinus-badge-designs{grid-template-columns:repeat(2,minmax(0,1fr))}@media(max-width:600px){.ed-textbook .lupinus-badge-grid,.ed-textbook .lupinus-badge-designs{grid-template-columns:1fr}}