@font-face{font-family:"Noto Sans KR";src:url("../fonts/NotoSansKR-Variable.ttf") format("truetype");font-weight:100 900;font-display:swap}
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13px;font-size:11px;color:#52728b}.page-footer svg{width:16px;height:16px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);padding:14px 22px;background:#2f495f;color:#fff;font-size:13px;border-radius:8px;box-shadow:0 6px 24px #293d5020;z-index:40;max-width:calc(100% - 32px);width:max-content;opacity:0;pointer-events:none;transition:opacity .2s}#toast.visible{opacity:1}.skip{position:fixed;top:-100px;left:16px;padding:12px;background:white;z-index:100}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-width:1500px){main{padding-left:60px;padding-right:60px}.layout{grid-template-columns:272px minmax(0,1fr) 256px}.prose{font-size:16px}}
@media(max-width:1190px){.layout{grid-template-columns:230px minmax(0,1fr)}.right-panel{display:none}main{padding:32px 40px 0}.header{padding:0 24px}.sidebar{padding:24px 14px}}
@media(max-width:800px){.header{height:72px;padding:0 18px;gap:14px}.brand{min-width:0;font-size:17px}.brand-icon{width:33px;height:35px;border-radius:8px}.brand small{font-size:9px}.search,.backup{display:none}.mobile-menu{display:block;margin-left:auto;font-size:12px}.layout{display:block}.sidebar{display:none;position:fixed;top:72px;left:0;width:min(300px,90vw);height:calc(100dvh - 72px);z-index:19;box-shadow:12px 0 30px #293d5014}.sidebar.is-open{display:flex}main{padding:25px 24px 0}.breadcrumb{margin-bottom:25px;font-size:9px}h1{font-size:29px}.study-meta{align-items:start}.study-meta>span{max-width:60%;line-height:1.7}.overview{padding:22px}.prose{font-size:14px}.section-body{padding-left:0}.lesson-section,#overview{scroll-margin-top:90px}.detail-tools small{display:none}.flow{margin-left:0;margin-right:0}}
@media(max-width:420px){main{padding:22px 17px 0}h1{font-size:26px}.title-row{gap:5px}.overview{padding:19px 17px}.overview-heading{gap:8px}.overview-heading>span{font-size:9px}.overview ul{padding-left:17px}.katex-display{font-size:.91em}.flow{padding:15px}.flow figcaption span{float:none;display:block;margin-top:4px}.page-footer{align-items:flex-start}.section-body table{font-size:11px}.detail-tools{font-size:11px}.detail-tools button{font-size:10px}.study-meta>span{max-width:54%}.brand{font-size:16px}.brand-icon{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Phase 1: data-driven navigation. Approved layout and type rules above retained. */
.related-links .next>span:first-child{min-width:0;overflow-wrap:anywhere}.right-sticky{min-width:0}.prose pre{font-size:12px}.prose pre code{font-size:inherit}main:focus-visible{outline:none}
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@media(max-width:1190px){.mobile-related{display:block;border-top:1px solid var(--line);padding:24px 0 40px}.mobile-related h2{font-size:16px}.mobile-related p{font-size:12px;color:#81929f;margin:18px 0 8px}.mobile-related .related-links{display:flex;gap:10px 20px;flex-wrap:wrap}.mobile-related .next{width:auto;max-width:100%;font-size:12px}.mobile-related:has(.related-links:empty){display:none}}
@media(max-width:800px){.lesson-pagination{gap:16px}.lesson-pagination strong{font-size:12px}.pending-content{padding:24px 19px}.prose .equation{text-align:left}.right-panel{display:none}.page-footer small{font-size:9px}.section-body pre{font-size:10px}.study-meta>span{max-width:60%}}
/* Phase 2: local search and personal records; existing lesson layout unchanged. */
body.has-study-dialog{overflow:hidden}.study-dialog{width:min(700px,calc(100vw - 40px));max-height:calc(100dvh - 48px);padding:0;border:1px solid #dce5ed;border-radius:13px;background:#fff;color:var(--ink);box-shadow:0 24px 90px #23354b30;overflow:auto}.study-dialog::backdrop{background:#263c5059;backdrop-filter:blur(3px)}.study-dialog [hidden]{display:none!important}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:25px 27px 17px}.dialog-heading small{font-size:9px;letter-spacing:1.6px;color:#8196a7}.dialog-heading h2{font-size:21px;margin:8px 0 0}.dialog-close{width:32px;height:32px;border:1px solid var(--line);border-radius:6px;color:#6d8395;font-size:15px}.search-field{margin:0 27px;display:flex;align-items:center;border:1px solid #cedce7;border-radius:7px;background:#f7f9fb;padding:0 13px}.search-field:focus-within{outline:2px solid #7fa3be;outline-offset:2px}.search-field input{width:100%;min-width:0;padding:14px 0;border:0;outline:none;background:transparent;font-size:14px;color:var(--ink)}.search-field input:focus-visible{outline:0}.search-field kbd{font:10px "Noto Sans KR",sans-serif;border:1px solid var(--line);border-radius:4px;padding:3px 5px;color:#8496a3}.search-options{display:flex;gap:7px;padding:16px 27px 10px}.search-options button{font-size:12px;border-radius:6px;padding:7px 12px;color:#708495;border:1px solid var(--line)}.search-options button[aria-pressed=true]{background:var(--blue);color:#355b78;border-color:#d6e2ec}.search-options span{font-size:10px;margin-left:5px}.resume-link{display:block;color:#597a93;font-size:11px;line-height:1.8;overflow-wrap:anywhere}.sidebar-resume{padding:10px 0;margin-bottom:12px;border-bottom:1px solid var(--line)}#search-resume{margin:0 27px;padding:8px 0}.search-count{font-size:11px;color:#8294a2;margin:6px 27px 10px}.search-results{max-height:48dvh;overflow:auto;overscroll-behavior:contain;padding:0 15px}.search-result{display:block;padding:16px 13px;border:1px solid transparent;border-bottom-color:#edf1f5;border-radius:7px;line-height:1.7}.search-result[aria-selected=true]{background:#eef4f9;border-color:#dbe6ef}.search-result:hover{background:#f2f6fa}.result-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.result-top strong{font-size:14px;font-weight:700;overflow-wrap:anywhere}.result-badges{display:flex;align-items:center;gap:7px;flex-shrink:0;font-size:12px;color:#6d8aa1}.ready-badge{font-size:9px;color:#4b7362;background:#edf4ef;border-radius:4px;padding:2px 5px;white-space:nowrap}.result-terms{display:block;font-size:11px;color:#6d8293;margin-top:4px;overflow-wrap:anywhere}.result-snippet{display:block;font-size:12px;color:#526a7d;margin:7px 0;overflow-wrap:anywhere}.result-chapter{font-size:10px;color:#8a9aa7}.search-empty{text-align:center;font-size:13px;color:#7c8f9e;padding:32px 27px;line-height:1.9}.dialog-footer{padding:14px 27px;display:flex;justify-content:space-between;gap:12px;font-size:10px;color:#8a9aa7;background:#f8fafb;border-top:1px solid var(--line);margin-top:12px}.backup-dialog{width:min(580px,calc(100vw - 40px))}.dialog-intro{font-size:13px;color:#738797;line-height:1.9;margin:0 27px 20px}.backup-section{padding:20px 27px;border-top:1px solid var(--line)}.backup-section h3{font-size:15px;margin:0 0 12px}.backup-section p{font-size:12px;line-height:1.9;color:#738797}.action-button{background:#355873;color:white;border:1px solid #355873;border-radius:6px;padding:10px 14px;font-size:12px}.action-button:hover{color:#fff;background:#284760}.action-button:disabled{background:#e4ebf0;border-color:#e4ebf0;color:#91a0ac;cursor:not-allowed}.file-label{font-size:12px;display:block;margin:16px 0 9px}.file-label small{font-size:10px;color:#8a9ca9;margin-left:7px}#import-records{display:block;max-width:100%;font-size:12px;color:#6a8193}#import-records::file-selector-button{font:inherit;background:#f2f6fa;border:1px solid #d9e4ed;border-radius:6px;color:#52728b;padding:8px 12px;margin-right:10px;cursor:pointer}#backup-message{min-height:20px;margin:13px 0 0}.error-message{color:#a05742!important}.restore-preview{padding:19px;margin-top:18px;background:#f5f8fb;border:1px solid var(--line);border-radius:7px}.restore-preview dl{display:grid;grid-template-columns:90px minmax(0,1fr);gap:10px;font-size:12px;line-height:1.8}.restore-preview dt{color:#7c8d9b}.restore-preview dd{margin:0;overflow-wrap:anywhere}.restore-consent{display:flex;align-items:flex-start;gap:8px;font-size:12px;line-height:1.8;margin-top:22px}.restore-consent input{accent-color:#426785;margin:4px 0}.restore-actions{display:flex;justify-content:flex-end;align-items:center;gap:14px;margin-top:16px}.restore-actions>button:not(.action-button){font-size:12px;color:#708596;padding:10px}.storage-warning{position:fixed;z-index:30;bottom:16px;left:50%;transform:translateX(-50%);max-width:calc(100vw - 32px);width:640px;padding:14px 20px;background:#fff8ed;color:#805b35;border:1px solid #e8dac4;border-radius:8px;font-size:12px;line-height:1.8;box-shadow:0 4px 20px #23354b15}.storage-warning[hidden]{display:none}
@media(max-width:800px){.header #open-search,.header #open-backup{display:flex;flex-shrink:0;justify-content:center;width:32px;height:34px;padding:6px;margin:0;border:1px solid var(--line);border-radius:6px;background:#f7f9fb}.header #open-search>span,.header #open-search>small,.header #open-backup>span{display:none}.header .brand{flex:1;min-width:0}.header .mobile-menu{margin-left:0;flex-shrink:0;padding:6px 0}.header{gap:9px}.study-dialog{width:calc(100vw - 24px);max-height:calc(100dvh - 24px);border-radius:10px}.dialog-heading{padding:20px 18px 15px}.dialog-heading h2{font-size:19px}.search-field{margin:0 18px}.search-field input{font-size:14px}.search-options{padding-left:18px;padding-right:18px}#search-resume,.search-count{margin-left:18px;margin-right:18px}.search-results{padding:0 8px;max-height:45dvh}.search-result{padding:13px 10px}.dialog-footer{padding:12px 18px;font-size:9px}.result-top strong{font-size:13px}.result-terms{font-size:10px}.backup-section{padding:20px 18px}.dialog-intro{margin-left:18px;margin-right:18px}.restore-preview{padding:15px}.restore-preview dl{grid-template-columns:70px minmax(0,1fr)}.result-badges{gap:4px}.dialog-heading small{font-size:8px}}
@media(max-width:420px){.header{padding:0 12px;gap:8px}.header .brand{font-size:14px;letter-spacing:-.5px}.header .brand small{font-size:8px}.header .mobile-menu{font-size:11px}.search-field kbd{display:none}.dialog-heading h2{font-size:18px}.result-top{gap:7px}}