:root{--ink:#16213b;--muted:#687086;--paper:#f6f2e9;--card:#fffdf8;--line:#ded9ce;--blue:#3158df;--blue-soft:#e9eeff;--mint:#dff4ed;--green:#167565;--amber:#9b6817;--shadow:0 18px 55px rgba(26,34,57,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Pretendard",Segoe UI,sans-serif}.skip-link{position:fixed;left:10px;top:-50px;z-index:100;background:#fff;padding:10px}.skip-link:focus{top:10px}button,input{font:inherit}button{cursor:pointer}.site-header{height:72px;padding:0 clamp(16px,3vw,38px);display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);background:rgba(255,253,248,.95);position:sticky;top:0;z-index:30;backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-size:14px;font-weight:850;letter-spacing:.1em}.brand small{display:block;font-size:7px;letter-spacing:.18em;color:var(--muted);margin-top:3px}.brand-mark{display:grid;place-items:center;width:36px;height:36px;background:var(--ink);border-radius:11px;color:#fff;font:800 21px Georgia}.site-header nav{display:flex;gap:5px;padding:4px;border-radius:13px;background:#ebe7dd}.nav-button{border:0;border-radius:10px;padding:9px 14px;background:transparent;color:var(--muted);font-size:12px}.nav-button.active{background:#fff;color:var(--ink);box-shadow:0 3px 12px rgba(24,32,52,.08)}.release-status{font-size:10px;color:var(--green)}
.study-shell{min-height:calc(100vh - 72px);display:grid;grid-template-columns:310px minmax(0,1fr)}.sentence-browser{height:calc(100vh - 72px);position:sticky;top:72px;display:flex;flex-direction:column;border-right:1px solid var(--line);background:#ece8de;padding:26px 20px}.browser-head{padding:0 8px}.eyebrow{margin:0 0 8px;color:var(--blue);font-size:9px;font-weight:850;letter-spacing:.18em}.browser-head h1{margin:0;font:600 29px/1.15 Georgia,serif}.browser-head>p:last-child{color:var(--muted);font-size:11px;line-height:1.55}.search-box{display:grid;gap:5px;margin:12px 7px}.search-box span{font-size:9px;color:var(--muted)}.search-box input{width:100%;border:1px solid #d5d0c5;border-radius:11px;background:#fff;padding:11px 12px;color:var(--ink)}.sentence-list{min-height:0;overflow:auto;display:grid;align-content:start;gap:6px;padding:4px 6px}.sentence-option{border:1px solid transparent;border-radius:12px;background:transparent;padding:11px;text-align:left;color:var(--ink)}.sentence-option:hover,.sentence-option:focus-visible{background:rgba(255,255,255,.55)}.sentence-option.active{border-color:#cfc8ba;background:#fff;box-shadow:0 8px 22px rgba(24,32,52,.06)}.sentence-option small{display:flex;justify-content:space-between;color:var(--muted);font-size:8px}.sentence-option strong{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:5px;font:500 12px/1.42 Georgia,serif}.list-actions{padding:8px}.secondary-button,.step-controls button,.translation-head button,.knowledge-head button,.error-panel button{border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);padding:9px 12px}.list-actions button{width:100%}
.lesson{padding:30px clamp(20px,4vw,62px) 42px;max-width:1320px;width:100%;margin:0 auto}.lesson-toolbar{display:flex;align-items:end;justify-content:space-between;margin-bottom:14px}.sentence-meta{margin:0;color:var(--muted);font-size:11px}.step-controls{display:flex;gap:7px}.sentence-stage,.focus-card,.insight-card,.knowledge-panel{border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow)}.sentence-stage{padding:clamp(22px,3vw,40px);min-height:270px}.stage-guide{display:flex;align-items:center;gap:8px;margin:0 0 20px;color:var(--muted);font-size:10px}.stage-guide span{display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--blue);color:#fff}.sentence-text{font:500 clamp(25px,3.2vw,42px)/1.62 Georgia,serif;letter-spacing:-.01em}.chunk-button{display:inline;border:0;border-radius:8px;background:transparent;color:inherit;font:inherit;padding:2px 3px;margin:0 -1px;box-decoration-break:clone;-webkit-box-decoration-break:clone}.chunk-button:hover,.chunk-button:focus-visible{background:#eef1f7;outline:2px solid transparent}.chunk-button.selected{background:var(--blue-soft);color:#1d3da8;box-shadow:inset 0 -2px 0 #6a86e8}.chunk-button.invalid{border-bottom:2px dotted #b17429}.translation-head{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);margin-top:22px;padding-top:15px;color:var(--muted);font-size:10px}.translation-head button{padding:7px 10px}.translation{min-height:52px;padding-top:10px;font-size:15px;line-height:1.7}.translation.hidden{visibility:hidden}.learning-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,.82fr);gap:16px;margin-top:16px}.focus-card,.insight-card{padding:22px;min-height:250px}.card-head{display:flex;justify-content:space-between;gap:14px}.card-head h2,.knowledge-head h2{margin:0;font:600 19px/1.3 Georgia,serif}.soft-badge{height:max-content;padding:5px 8px;border-radius:20px;background:var(--mint);color:var(--green);font-size:8px;font-weight:800}.focus-content{margin-top:18px}.focus-main{font:600 21px Georgia}.focus-meaning{margin:8px 0 0;color:var(--green);font-size:15px}.focus-role{margin:10px 0 0;color:var(--muted);font-size:11px}.empty-message{color:var(--muted);font-size:12px;line-height:1.6}.word-strip{display:flex;gap:7px;flex-wrap:wrap;margin-top:18px;padding-top:15px;border-top:1px solid var(--line)}.word-button{border:1px solid #d8d4ca;border-radius:9px;background:#fff;padding:8px 10px;color:var(--ink)}.word-button:hover,.word-button.active{border-color:var(--blue);background:var(--blue-soft);color:#173ca9}.word-detail{margin-top:14px;padding:12px;border-radius:12px;background:#f2f4f9;font-size:11px;line-height:1.55}.level-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);padding-bottom:12px}.level-tabs button{border:0;border-radius:9px;background:transparent;padding:8px 11px;color:var(--muted)}.level-tabs button[aria-selected="true"]{background:var(--ink);color:#fff}.insight-content{padding-top:13px;max-height:230px;overflow:auto}.insight-item{padding:10px 0;border-bottom:1px solid #eeeae2}.insight-item:last-child{border:0}.insight-item strong{display:block;font-size:11px}.insight-item span{display:block;color:var(--muted);font-size:10px;line-height:1.55;margin-top:3px}.knowledge-panel{padding:20px 22px;margin-top:16px}.knowledge-head{display:flex;align-items:center;justify-content:space-between;gap:18px}.knowledge-content{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.knowledge-column{padding:15px;border-radius:14px;background:#f5f3ee}.knowledge-column h3{margin:0 0 10px;font-size:11px}.knowledge-item{padding:8px 0;border-top:1px solid #dedad1}.knowledge-item strong{display:block;font-size:10px}.knowledge-item span{font-size:9px;color:var(--muted)}.error-panel{position:fixed;z-index:80;right:18px;bottom:18px;max-width:360px;display:grid;gap:7px;padding:16px;border:1px solid #dda5a5;border-radius:14px;background:#fff4f4;box-shadow:var(--shadow);font-size:11px}.error-panel[hidden]{display:none}
@media(max-width:1050px){.study-shell{grid-template-columns:250px minmax(0,1fr)}.learning-grid{grid-template-columns:1fr}.insight-card{min-height:210px}.site-header .release-status{display:none}}
@media(max-width:820px){.site-header{height:auto;min-height:64px;flex-wrap:wrap;padding:10px 14px;gap:8px}.site-header nav{order:3;width:100%;display:grid;grid-template-columns:repeat(3,1fr)}.nav-button{padding:8px 4px}.study-shell{display:block}.sentence-browser{height:auto;position:static;border-right:0;border-bottom:1px solid var(--line);padding:18px 14px}.browser-head h1{font-size:24px}.browser-head>p:last-child{margin-bottom:8px}.sentence-list{display:flex;overflow-x:auto}.sentence-option{min-width:210px}.list-actions{display:none}.lesson{padding:18px 14px 36px}.sentence-stage{padding:22px 18px;min-height:250px}.sentence-text{font-size:25px;line-height:1.58}.lesson-toolbar{align-items:center}.step-controls button{padding:8px}.learning-grid{grid-template-columns:1fr}.knowledge-content{grid-template-columns:1fr}.knowledge-head{align-items:flex-start}.knowledge-head h2{font-size:16px}}
@media(max-width:420px){.brand small{display:none}.browser-head>p:last-child{display:none}.sentence-browser{padding-top:12px}.sentence-option{min-width:180px}.sentence-stage{border-radius:16px}.sentence-text{font-size:22px}.translation{font-size:14px}.focus-card,.insight-card,.knowledge-panel{padding:18px;border-radius:16px}.lesson-toolbar{gap:8px}.sentence-meta{max-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}}
.knowledge-content[hidden]{display:none}
.chunk-button:not(.selected){box-shadow:inset 0 -1px 0 rgba(49,88,223,.18)}
.sentence-text .word-button{border:0;border-radius:5px;background:transparent;padding:1px 2px;color:inherit;font:inherit}.sentence-text .word-button:hover,.sentence-text .word-button.active{background:#cdd9ff;color:#173ca9}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.knowledge-column{min-width:0}.knowledge-card{margin-top:9px;border:1px solid #ddd8cd;border-radius:13px;background:#fff;overflow:hidden;transition:border-color .16s ease,box-shadow .16s ease}.knowledge-card.selected{border-color:#6a86e8;box-shadow:0 0 0 3px rgba(49,88,223,.1)}.knowledge-card-select{display:block;width:100%;border:0;background:transparent;padding:13px 13px 10px;text-align:left;color:var(--ink)}.knowledge-card-select strong{display:block;font-size:13px;line-height:1.4}.knowledge-title-en{display:block;margin-top:3px;color:var(--muted);font-size:9px;letter-spacing:.02em}.knowledge-status{display:inline-block;margin-top:7px;padding:3px 7px;border-radius:999px;font-size:9px;font-weight:700;line-height:1.25}.knowledge-status.official{background:#e7f3ec;color:#22633d}.knowledge-status.analysis{background:#eef1f7;color:#40516f}.knowledge-applied{display:block;margin-top:9px;padding:7px 9px;border-radius:8px;background:#eef1f7;color:#29406f;font-size:10px;line-height:1.45;overflow-wrap:anywhere}.knowledge-explanation{margin:0;padding:0 13px 10px;font-size:11px;line-height:1.65;word-break:keep-all;overflow-wrap:anywhere}.knowledge-evidence{margin:0;padding:0 13px 12px;color:var(--muted);font-size:9px}.knowledge-card details{border-top:1px solid #ece8df;padding:9px 13px 11px;color:var(--muted);font-size:10px;line-height:1.55}.knowledge-card summary{color:var(--blue);cursor:pointer;font-weight:700}.knowledge-card details p{margin:8px 0 0;overflow-wrap:anywhere}.knowledge-highlight{border-radius:4px;background:#ffe59a;color:inherit;box-shadow:0 0 0 2px rgba(214,156,25,.18)}.sentence-text .word-button.knowledge-active{background:#ffe59a;color:inherit;box-shadow:0 0 0 2px rgba(214,156,25,.18)}
@media(max-width:430px){.knowledge-card-select{padding:12px 11px 9px}.knowledge-explanation,.knowledge-evidence{padding-left:11px;padding-right:11px}.knowledge-card details{padding-left:11px;padding-right:11px}}
.structure-view-panel{margin-top:16px;padding:22px;border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow)}.structure-view-panel[hidden]{display:none}.structure-view-head{display:flex;justify-content:space-between;gap:16px}.structure-view-head h2{margin:0;font:600 19px/1.3 Georgia,serif}.structure-view-guide{color:var(--muted);font-size:11px}.structure-view-group{margin-top:20px}.structure-view-group h3{margin:0 0 10px;font-size:13px}.structure-view-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.structure-view-card{min-width:0;padding:14px;border:1px solid #ddd8cd;border-radius:13px;background:#fff}.structure-card-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.structure-card-head strong{font-size:12px}.structure-scope{padding:4px 7px;border-radius:999px;font-size:8px;font-weight:800}.structure-scope.native{background:#e7f3ec;color:#22633d}.structure-scope.local{background:#fff1d8;color:#815717}.structure-surface{margin:13px 0 7px;font:600 18px Georgia,serif}.structure-function,.structure-note{margin:5px 0;color:var(--muted);font-size:10px;line-height:1.55}.structure-developer{margin-top:10px;border-top:1px solid #ece8df;padding-top:9px;color:var(--muted);font-size:9px}.structure-developer summary{cursor:pointer;color:var(--blue);font-weight:700}.structure-developer pre{max-height:220px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere}.structure-reading-note{margin-top:18px;padding:12px;border-radius:10px;background:#eef1f7;color:#40516f;font-size:10px}@media(max-width:820px){.structure-view-grid{grid-template-columns:1fr}.structure-view-panel{padding:18px;border-radius:16px}}

.profile-card{margin-top:1rem;padding:1rem;border:1px solid var(--line,#d8dde8);border-radius:16px;background:#fff}.profile-card #profileContent{display:grid;grid-template-columns:repeat(auto-fit,minmax(135px,1fr));gap:.55rem}.profile-row{display:flex;justify-content:space-between;padding:.55rem .7rem;background:#f5f7fb;border-radius:10px}.profile-note{grid-column:1/-1;margin:.35rem 0 0;color:#596174;font-size:.9rem}
.section-heading,.panel-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-heading button,.panel-actions button{border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);padding:8px 11px}.profile-card #profileContent[hidden],#structureViewContent[hidden]{display:none}.profile-developer{grid-column:1/-1;color:var(--muted);font-size:10px}.profile-developer summary{cursor:pointer;color:var(--blue);font-weight:700}.profile-developer pre{max-height:240px;overflow:auto;white-space:pre-wrap}.panel-actions{justify-content:flex-end}
.translation-head .review-pending{color:#815717}.translation-head .review-pending::after{content:" · 품질 검토 상태는 변경하지 않았습니다";font-size:9px;color:var(--muted)}

.curriculum-panel{border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow);padding:18px 22px;margin-bottom:16px}.curriculum-head{display:flex;justify-content:space-between;align-items:center}.curriculum-head h2{margin:0;font:600 19px/1.3 Georgia,serif}.curriculum-controls{display:grid;grid-template-columns:minmax(220px,2fr) minmax(110px,1fr) auto auto;gap:8px;align-items:end;margin-top:14px}.curriculum-controls label{display:grid;gap:5px;color:var(--muted);font-size:9px}.curriculum-controls select,.curriculum-controls button{min-height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:8px 10px;color:var(--ink)}.curriculum-summary{margin-top:10px;color:var(--muted);font-size:11px;line-height:1.5}.sentence-option small span:first-child{font-weight:700;color:var(--blue)}@media(max-width:900px){.curriculum-controls{grid-template-columns:1fr 1fr}.curriculum-controls button{width:100%}}@media(max-width:430px){.curriculum-panel{padding:16px}.curriculum-controls{grid-template-columns:1fr}.curriculum-head{align-items:flex-start}}