/* ENGL251 book skin: an additive visual layer over the self-contained textbook. */
.course-book-shell{--liu-navy:#082b5c;--liu-navy-2:#123f78;--liu-gold:#b58a24;--liu-ink:#182433;--liu-muted:#586779;--liu-paper:#fff;--liu-wash:#eef3f8;--liu-line:#d6dee8;background:linear-gradient(180deg,#eaf0f6 0,#f7f8fa 45%,#edf1f5 100%)!important;color:var(--liu-ink)!important;font-family:Arial,sans-serif!important}.course-book-shell *{box-sizing:border-box}.course-book-shell .book-portal-bar{background:#061d3e;color:#fff;padding:.42rem max(1rem,calc((100% - 1180px)/2));font-size:.82rem;display:flex;justify-content:space-between;gap:1rem}.course-book-shell .book-portal-bar a{color:#fff}.course-book-shell .book-portal-header{display:flex;align-items:center;gap:1rem;background:#fff;padding:.72rem max(1rem,calc((100% - 1180px)/2));border-bottom:1px solid var(--liu-line)}.course-book-shell .book-portal-header img{width:108px;height:36px}.course-book-shell .book-portal-title{color:var(--liu-navy);text-decoration:none;font-family:Georgia,serif;font-size:1.22rem;font-weight:700}.course-book-shell .book-portal-title span{display:block;font:12px Arial,sans-serif;color:var(--liu-muted);margin-top:2px}.course-book-shell .book-portal-nav{background:var(--liu-navy);padding:0 max(1rem,calc((100% - 1180px)/2));display:flex;gap:.15rem;overflow:auto}.course-book-shell .book-portal-nav a{color:#fff;text-decoration:none;padding:.72rem .75rem;white-space:nowrap;font:700 .83rem Arial,sans-serif}.course-book-shell .book-portal-nav a:hover,.course-book-shell .book-portal-nav a[aria-current]{background:var(--liu-navy-2);box-shadow:inset 0 -3px var(--liu-gold)}.course-book-shell .book-breadcrumbs{max-width:1180px;margin:0 auto;padding:.75rem 1rem;color:var(--liu-muted);font: .85rem Arial,sans-serif}.course-book-shell .book-breadcrumbs a{color:var(--liu-navy);font-weight:700}.course-book-shell .book-chapter-controls{display:flex;gap:1.3rem;justify-content:flex-end;padding-top:0}.course-book-shell .book-reading-tools{width:min(calc(100% - 2rem),1180px);margin:.25rem auto 1rem;padding:.7rem 1rem;display:flex;gap:.5rem;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--liu-line);border-radius:8px;box-shadow:0 3px 10px #082b5c0d;font: .86rem Arial,sans-serif}.course-book-shell .book-reading-tools strong{color:var(--liu-navy);margin-right:.35rem}.course-book-shell .book-reading-tools button{border:1px solid #9aaabd;background:#fff;color:var(--liu-navy);padding:.4rem .65rem;border-radius:5px;cursor:pointer;font-weight:700}.course-book-shell .book-reading-tools button:hover{background:#eaf0f6;border-color:var(--liu-navy)}.course-book-shell .progress-bar{height:4px!important;background:var(--liu-gold)!important;box-shadow:none!important;z-index:100!important}.course-book-shell .shell{width:min(100%,1260px)!important;margin:0 auto!important;padding:0 1rem 2.5rem!important}.course-book-shell .topbar{position:static!important;display:flex!important;align-items:center!important;justify-content:space-between!important;gap:1rem!important;margin:0 0 1rem!important;padding:.85rem 1rem!important;border:1px solid var(--liu-line)!important;border-radius:8px!important;background:#fff!important;box-shadow:0 3px 10px #082b5c0d!important;backdrop-filter:none!important}.course-book-shell .brand a{color:var(--liu-navy)!important;font-family:Georgia,serif!important;font-size:1.08rem}.course-book-shell .brand small{color:var(--liu-muted)!important}.course-book-shell .controls{justify-content:flex-end!important}.course-book-shell .controls input{width:min(280px,42vw)!important;padding:.58rem .75rem!important;border:1px solid #9aaabd!important;border-radius:5px!important;background:#fff!important;color:var(--liu-ink)!important}.course-book-shell .controls input::placeholder{color:#647386!important}.course-book-shell .toggle-btn{padding:.52rem .68rem!important;border:1px solid #9aaabd!important;border-radius:5px!important;background:#fff!important;color:var(--liu-navy)!important;font-weight:700}.course-book-shell .toggle-btn:hover{background:#eaf0f6!important}.course-book-shell .reader-layout{grid-template-columns:265px minmax(0,1fr)!important;gap:1.3rem!important}.course-book-shell .sidebar{top:1rem!important;gap:.85rem!important}.course-book-shell .sidebar-panel{padding:1rem!important;border:1px solid #123f7860!important;border-radius:8px!important;background:var(--liu-navy)!important;box-shadow:0 7px 17px #082b5c20!important;backdrop-filter:none!important}.course-book-shell .sidebar-panel h2{margin:0 0 .65rem!important;color:#f6e8bf!important;font:700 .78rem/1.4 Arial,sans-serif!important;text-transform:uppercase!important;letter-spacing:.1em!important}.course-book-shell .sidebar-link{padding:.38rem 0!important;color:#f4f7fb!important;font: .88rem/1.42 Arial,sans-serif!important}.course-book-shell .sidebar-link:hover,.course-book-shell .sidebar-link.active{color:#f4d783!important}.course-book-shell .sidebar-note{color:#dce7f3!important;font: .86rem/1.5 Arial,sans-serif!important}.course-book-shell .bookmark-item{padding:.65rem!important;border-radius:5px!important;background:#ffffff16!important}.course-book-shell .bookmark-item a,.course-book-shell .bookmark-item button{color:#fff!important}.course-book-shell .page{background:var(--liu-paper)!important;border:1px solid var(--liu-line)!important;border-radius:10px!important;box-shadow:0 10px 26px #082b5c17!important;padding:clamp(1.2rem,3vw,3rem)!important}.course-book-shell .hero{margin:calc(-1 * clamp(1.2rem,3vw,3rem)) calc(-1 * clamp(1.2rem,3vw,3rem)) 2rem!important;padding:clamp(1.5rem,4vw,3.2rem)!important;background:linear-gradient(120deg,#061d3e,#082b5c 68%,#164d89)!important;border-radius:10px 10px 0 0!important;color:#fff!important}.course-book-shell .hero h1{color:#fff!important;font-family:Georgia,serif!important;font-size:clamp(2rem,4vw,3.35rem)!important;text-shadow:none!important}.course-book-shell .hero p{color:#e4edf8!important;font-family:Arial,sans-serif!important;line-height:1.7!important}.course-book-shell .hero-grid{grid-template-columns:1.15fr .85fr!important}.course-book-shell .header-section-guide,.course-book-shell .home-tools{border:1px solid #ffffff35!important;border-radius:7px!important;background:#ffffff10!important}.course-book-shell .header-section-guide h2,.course-book-shell .home-tools h2{color:#f7df9f!important;font-family:Georgia,serif!important}.course-book-shell .header-section-link{color:#fff!important;font-family:Arial,sans-serif!important}.course-book-shell .chapter-action-btn,.course-book-shell button.quiz-option,.course-book-shell .mini-bookmark{border-radius:5px!important;background:var(--liu-navy)!important;color:#fff!important;border:1px solid var(--liu-navy)!important;font-family:Arial,sans-serif!important}.course-book-shell .chapter-action-secondary{background:transparent!important;border-color:#d8e4f2!important}.course-book-shell .chapter-body{color:var(--liu-ink)!important;font-size:1em!important}.course-book-shell .chapter-body :is(p,li,td,th,summary){color:var(--liu-ink)!important}.course-book-shell .chapter-title,.course-book-shell .chapter-body h2,.course-book-shell .chapter-body h3,.course-book-shell .chapter-body h4{color:var(--liu-navy)!important;font-family:Georgia,serif!important;line-height:1.25!important}.course-book-shell .chapter-body h3{border-bottom:2px solid var(--liu-gold)!important;padding-bottom:.42rem!important;margin-top:2.35rem!important}.course-book-shell .chapter-body a{color:var(--liu-navy)!important;text-underline-offset:3px}.course-book-shell .table-wrap table{border-color:var(--liu-line)!important}.course-book-shell .table-wrap :is(th,td){border-color:var(--liu-line)!important}.course-book-shell .table-wrap th{background:#eaf0f6!important;color:var(--liu-navy)!important}.course-book-shell .callout{border-radius:6px!important;border-left-width:4px!important}.course-book-shell .self-check-panel,.course-book-shell .inline-self-check{border:1px solid var(--liu-line)!important;border-radius:8px!important;background:#f8fafc!important;box-shadow:none!important}.course-book-shell .quiz-option{width:100%!important;text-align:left!important;margin:.35rem 0!important;padding:.72rem .85rem!important;background:#fff!important;color:var(--liu-ink)!important;border:1px solid #a8b6c6!important}.course-book-shell .quiz-option:hover{border-color:var(--liu-navy)!important;background:#edf3fa!important}.course-book-shell .quiz-feedback{border-radius:5px!important}.course-book-shell .study-panel,.course-book-shell .glossary-card{border-color:var(--liu-line)!important;border-radius:7px!important;background:#fff!important}.course-book-shell .glossary-card summary{color:var(--liu-navy)!important}.course-book-shell .book-portal-footer{padding:1.5rem 1rem;max-width:1180px;margin:auto;color:var(--liu-muted);font:.84rem Arial,sans-serif}.course-book-shell.book-wide .chapter-body{max-width:1200px!important}.course-book-shell.book-dark .page,.course-book-shell.book-dark .chapter-body{background:#132235!important;color:#eef5ff!important}.course-book-shell.book-dark .page :is(p,li,h1,h2,h3,h4,td,summary){color:#eef5ff!important}.course-book-shell.book-dark .chapter-body h3{border-color:#d4ad4b!important}@media print{.book-portal-bar,.book-portal-header,.book-portal-nav,.book-breadcrumbs,.book-reading-tools,.book-portal-footer{display:none!important}}@media(max-width:900px){.course-book-shell .reader-layout{grid-template-columns:1fr!important}.course-book-shell .sidebar{position:static!important}.course-book-shell .sidebar-panel:not(.local-toc){display:none!important}.course-book-shell .topbar{flex-direction:column!important;align-items:stretch!important}.course-book-shell .controls{justify-content:flex-start!important}.course-book-shell .hero-grid{grid-template-columns:1fr!important}}@media(max-width:600px){.course-book-shell .book-portal-bar{display:block}.course-book-shell .book-portal-header img{width:78px}.course-book-shell .book-portal-title{font-size:1rem}.course-book-shell .book-chapter-controls{justify-content:space-between;gap:.65rem}.course-book-shell .controls input{width:100%!important}.course-book-shell .hero{margin-bottom:1.2rem!important}}