:root{--surface-0: #ffffff;--surface-1: #f8fafc;--surface-2: #f1f5f9;--border-soft: #e5e7eb;--border-muted: #f1f5f9;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--accent: #6366f1;--accent-soft: #eef2ff;--accent-hover: #4f46e5;--success: #10b981;--radius-xs: 6px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-pill: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 2px 8px rgba(0, 0, 0, .06), 0 0 0 1px rgba(0, 0, 0, .03);--output-custom-main-max: 760px;--output-custom-edit-sidebar-width: 220px;--output-custom-edit-header-height: 44px;--output-custom-left-pane-min-height: calc(100dvh - var(--common-header-offset, 52px) - var(--output-custom-edit-header-height, 44px) - 1.5rem)}body{padding-top:var(--common-header-offset, 52px);min-height:100vh;display:flex;flex-direction:column}main{flex:1;display:flex;flex-direction:column}.main-content{padding:0;padding-top:calc(var(--common-header-offset, 52px) + var(--output-custom-edit-header-height, 44px));background:#fff;min-height:100vh}html.js-enabled .baekji-bokseup-page.baekji-bokseup-page--booting .main-content,html.js-enabled .baekji-bokseup-page.baekji-bokseup-page--booting #common-footer-mount{visibility:hidden}.baekji-page-header{position:fixed;top:var(--common-header-offset, 52px);left:0;right:0;z-index:12;display:flex;align-items:stretch;justify-content:space-between;height:var(--output-custom-edit-header-height, 44px);padding:0 1rem;background:#fff;border-bottom:1px solid var(--border-soft);transition:top .3s ease}.baekji-page-header__left{display:flex;align-items:center;gap:.5rem;width:var(--output-custom-edit-sidebar-width, 280px);min-width:0;flex-shrink:0;padding-right:.5rem}.baekji-page-header__title{font-size:13px;font-weight:700;color:var(--text-primary)}.baekji-page-header__right{flex:1;display:flex;align-items:stretch;justify-content:center;min-width:0;padding-left:.5rem;padding-right:.75rem;position:relative}.baekji-page-header__right .baekji-pane-tabs{margin:0;height:100%;width:auto;display:flex;align-items:stretch;position:absolute;left:.5rem;top:0}.baekji-page-header__right .baekji-pane-tabs__track{padding:0;height:100%;width:auto;border-bottom:0;display:flex;align-items:stretch}.baekji-page-header__right .baekji-pane-tabs__list{height:100%;min-height:100%;align-items:stretch}.baekji-page-header__right .baekji-pane-tab{height:100%;border-radius:0}.baekji-page-header__right .baekji-pane-tabs__divider{display:none}.baekji-page-header__right .baekji-pane-tabs__indicator{bottom:-1px}.baekji-bokseup-page 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44px));width:var(--output-custom-edit-sidebar-width, 280px);height:calc(100dvh - var(--common-header-offset, 52px) - var(--output-custom-edit-header-height, 44px));overflow-y:auto;overscroll-behavior-y:contain;scrollbar-gutter:stable;z-index:10}body.baekji-bokseup-page .baekji-layout-panel.baekji-layout-panel--sidebar>.baekji-layout-sidebar-pane{overflow:visible}}.baekji-layout-panel.baekji-layout-panel--main{min-width:0;box-sizing:border-box;overflow:visible}.baekji-layout-main-pane{display:flex;flex-direction:column;border-bottom:1px solid var(--border-muted);padding:.75rem 1.25rem;overflow:visible;flex:none;min-height:0;min-width:0}body[data-active-left-pane-tab=home] .baekji-layout-main-pane,.baekji-layout-main-pane.is-non-home-tab{padding-left:0;padding-right:0}.baekji-layout-main-pane:last-child{border-bottom:none}.baekji-bokseup-page .cw-header{position:sticky;top:0;z-index:6;margin-bottom:.75rem;background:var(--surface-0);border-bottom:1px solid var(--border-soft)}.baekji-bokseup-page .cw-header__inner{display:flex;align-items:center;flex-wrap:wrap;gap:1px;width:100%;margin:0;padding:6px 0}.baekji-bokseup-page .cw-toolbar__btn{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:32px;padding:0 6px;border:none;background:transparent;color:var(--text-secondary);border-radius:7px;font-size:.85rem;font-weight:700;cursor:pointer;transition:background-color .15s,color .15s}.baekji-bokseup-page .cw-toolbar__btn:hover{background:#0000000a;color:var(--text-primary)}.baekji-bokseup-page .cw-toolbar__btn:active{background:#0000000f}.baekji-bokseup-page .cw-toolbar__btn:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.baekji-bokseup-page .cw-toolbar__divider{width:1px;height:16px;background:var(--border-soft);margin:0 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var(--border-soft)}.baekji-pane-tabs__list{display:flex;align-items:center;gap:.25rem;width:100%;min-height:var(--baekji-pane-tab-target-height)}.baekji-pane-tab{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:var(--baekji-pane-tab-target-height);padding:0 .9rem;border:none;border-radius:var(--radius-sm) var(--radius-sm) 0 0;background:transparent;color:var(--text-muted);font-size:13px;font-weight:600;line-height:1.2;letter-spacing:.01em;cursor:pointer;white-space:nowrap;transition:color .18s ease,background-color .18s ease}.baekji-pane-tab:hover{color:var(--text-primary);background:var(--surface-1)}.baekji-pane-tab:focus-visible{outline:2px solid rgba(15,23,42,.35);outline-offset:1px}.baekji-pane-tab.is-active{color:var(--text-primary)}.baekji-pane-tabs__divider{display:none}.baekji-pane-tabs__indicator{position:absolute;left:0;bottom:-1px;width:0;height:2px;border-radius:var(--radius-pill);background:#111;pointer-events:none;transition:transform 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#f1f5f9;padding-bottom:1.25rem}.baekji-introduce-faq-item:last-child{border-bottom:none;padding-bottom:0}.category-chip-grid{display:flex;flex-wrap:wrap;gap:6px}.category-chip-grid.is-tree{display:block;gap:0}.category-tree{display:flex;flex-direction:column;gap:2px;font-family:inherit}.category-tree-group{display:flex;flex-direction:column;gap:1px}.category-tree-group>summary{list-style:none}.category-tree-group>summary::-webkit-details-marker{display:none}.category-tree-group>summary::marker{content:""}.category-tree-subjects{display:flex;flex-direction:column;gap:1px;margin-left:1.25rem;padding-left:.75rem;border-left:1px solid var(--border-soft)}.category-tree-item{display:flex;align-items:center;gap:.375rem;padding:.35rem .5rem;border:none;border-radius:var(--radius-xs);background:transparent;color:var(--text-secondary);font-size:12.5px;font-weight:500;transition:all .12s;cursor:pointer;text-align:left}.category-tree-item:before{font-family:Material Symbols 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0));opacity:0;transition:transform .08s linear,opacity .2s ease}.new-output-quiz-rail{position:fixed;top:calc(var(--common-header-offset, 52px) + var(--new-output-quiz-header-height));bottom:0;width:calc(50% - var(--new-output-quiz-max-width) / 2);display:none;z-index:40}.new-output-quiz-rail--left{left:0}.new-output-quiz-rail--right{right:0;padding:1rem 0}@media(min-width:1140px){.new-output-quiz-rail{display:flex;flex-direction:column;align-items:stretch}.new-output-quiz-rail--left{padding:0}#quizRailToc{flex:0 0 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var(--quiz-color-border)}.edit-history-diff-split-row+.edit-history-diff-split-row .edit-history-diff-split-cell{border-top:1px solid rgba(229,231,235,.55)}.edit-history-diff-split-cell.is-del{background:#fef2f2}.edit-history-diff-split-cell.is-add{background:#ecfdf5}.edit-history-diff-split-cell.is-ctx{background:#fff}.edit-history-diff-split-cell.is-empty{background:#fff;opacity:.75}.quiz-action-btn.is-active{color:#4f46e5;background:#eef2ff;border-radius:4px}.quiz-action-btn[disabled]{opacity:.45;cursor:not-allowed}.quiz-action-btn[disabled]:hover{color:inherit}:root{--font-sans: var(--font-family-sans, "Pretendard Variable", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif)}body{background-color:#fff;min-height:100vh;width:100%;margin:0;overflow-x:hidden;overflow-y:auto}@media(max-width:1139px){.baekji-side-ad-rail{display:none}}@media(min-width:1140px){.baekji-side-ad-rail{display:block}}.page-shell{position:relative;min-height:calc(100vh - var(--common-header-offset, 0px));width:100%;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;padding:2rem 0;box-sizing:border-box}.baekji-page-stack-list{width:100%;display:flex;flex-direction:column}.baekji-page-stack-item{min-height:70vh}.baekji-page-stack-item__editor{z-index:1;outline:none}.baekji-page-stack-item__editor[contenteditable=false]{cursor:default}.baekji-page-stack-item__review-input{z-index:1}.baekji-page-stack-item__result{z-index:2}.baekji-page-stack-item__result.is-visible{display:block}.baekji-page-stack-item__hint{z-index:2}.baekji-page-stack-item__control-hidden{display:none!important}@media(max-width:960px){.baekji-page-stack-item{min-height:auto;flex-direction:column}}.bg-paper{background-color:#fdfbf7}.bg-paper\/90{background-color:#fdfbf7e6}.shadow-page-left{border-right:1px solid #e2e8f0}.editor-content{outline:none;line-height:1.75rem;font-size:.875rem;color:#334155}.editor-content p{margin-bottom:0;margin-top:0}.review-start-hint{position:absolute;inset:0;color:#000;font-size:.875rem;line-height:1.75rem;white-space:normal;pointer-events:auto}.book-wrapper{perspective:1200px}.page-wrapper{position:relative;transform-style:preserve-3d;transition:transform .9s cubic-bezier(.645,.045,.355,1)}.page-front,.page-back{position:absolute;width:100%;height:100%;backface-visibility:hidden}.page-front{z-index:2}.page-back{transform:rotateY(180deg);z-index:1}.flip-to-next{transform:rotateY(-180deg);z-index:100!important}.flip-to-prev{transform:rotateY(180deg);z-index:100!important}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0003;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#0006}.hidden-transition{opacity:0;pointer-events:none;transform:scale(.95)}.highlight-diff-wrong{background:transparent;color:inherit;text-decoration:none;padding:0;border-radius:0}.highlight-match{background-color:#22c55e40;color:#166534;padding:0 4px;border-radius:2px}.skeleton-line{height:1.5rem;background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:skeleton-shimmer 1.5s infinite;border-radius:4px;margin-bottom:.75rem;width:100%}.skeleton-line.w-3\/4{width:75%}.skeleton-line.w-2\/3{width:66%}.skeleton-line.w-1\/2{width:50%}@keyframes skeleton-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.section-title{font-size:1.125rem;font-weight:700;color:#334155;margin-bottom:.75rem}.section-title-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem;width:100%}.section-title-row .section-title{margin-bottom:0}.overflow-x-auto::-webkit-scrollbar{display:none}.overflow-x-auto{-ms-overflow-style:none;scrollbar-width:none}.category-tree-item--quiz{position:relative;padding-right:3.25rem}.category-tree-item--quiz .category-tree-item-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}