:root{--ink:#283b35;--muted:#7d8982;--accent:#456c57;--soft:#edf2e9;--line:#e5e9e2;--bg:#f7f8f5;--white:#fff;--radius:18px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 -apple-system,BlinkMacSystemFont,'Noto Sans KR','Malgun Gothic',sans-serif;letter-spacing:-.25px}button,input,select,a.button{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 17px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);text-decoration:none;cursor:pointer;transition:background .16s,border-color .16s}button:hover,.button:hover{background:#f1f5ed;border-color:#bdcbbd}button:disabled{opacity:.45;cursor:default}.primary{background:var(--accent);color:white;border-color:var(--accent)}.primary:hover{background:#345440;color:white}.text-button{background:none;border:0;padding:8px 0;color:var(--accent);font-size:13px}.quiet-button{font-size:12px;white-space:nowrap}.full{width:100%}.icon{border:0;background:transparent;font-size:25px;min-width:44px;padding:4px}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}[hidden]{display:none!important}:focus-visible{outline:3px solid #94b99e;outline-offset:4px}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:650;letter-spacing:-.7px}h1{font-size:25px}h2{font-size:20px}h3{font-size:17px}p{color:var(--muted)}input,select{min-height:44px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:9px 12px;color:var(--ink);max-width:100%}input[type=checkbox],input[type=radio]{min-height:0;accent-color:var(--accent)}summary{cursor:pointer;min-height:44px;padding:12px 0;font-size:13px;color:var(--muted)}small,.help{font-size:12px;color:var(--muted)}.help{line-height:1.8;margin:10px 0}.eyebrow{font-size:10px;font-weight:650;letter-spacing:1.5px;color:var(--muted)}
.rail{position:fixed;inset:0 auto 0 0;width:224px;padding:42px 24px 28px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:20}.brand{color:var(--ink);text-decoration:none;font-size:19px;font-weight:750;display:flex;align-items:center;gap:10px;letter-spacing:-1px}.brand small{display:block;font-size:10px;font-weight:400;letter-spacing:-.2px;color:var(--muted);margin-top:4px}.brand-mark{display:flex;gap:3px;align-items:center;width:28px;height:30px;flex-shrink:0}.brand-mark i{width:5px;height:17px;background:var(--accent);border-radius:4px;transform:rotate(16deg)}.brand-mark i:nth-child(2){height:28px}.brand-mark i:nth-child(3){height:22px;opacity:.5}nav{display:grid;gap:7px;margin-top:55px}.nav{justify-content:flex-start;gap:12px;border:0;background:none;color:var(--muted);font-size:14px;padding:12px 15px}.nav svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linejoin:round}.nav.active{background:var(--soft);color:var(--accent);font-weight:650}.rail-bottom{margin-top:auto;font-size:11px}.rail-caption{font-size:12px;color:var(--ink)}.rail-bottom p{margin-top:10px;line-height:1.9}.system-details{border-top:1px solid var(--line);margin-top:22px}.connection{font-size:11px;display:block}.connection.ok:before{content:'';display:inline-block;background:#7c9f73;width:6px;height:6px;border-radius:50%;margin-right:6px}.connection.warn{color:#ac6a39}main{margin-left:224px;padding:36px 50px;max-width:1430px}.page-header{display:flex;align-items:center;justify-content:space-between;padding-bottom:24px;border-bottom:1px solid var(--line);margin-bottom:32px}.header-note{font-size:11px;color:var(--muted)}.home-heading{margin:4px 0 25px}.home-heading h2{font-size:31px;line-height:1.45;letter-spacing:-1.3px}.home-heading p{font-size:13px;margin-top:12px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:30px 0 16px}.section-head h2{font-size:18px}.section-head h2 span{font-size:14px;font-weight:500;color:var(--muted);margin-left:5px}.section-intro{margin-bottom:26px}.section-intro h2{font-size:25px}.section-intro p{font-size:13px;margin-top:10px}.feature-lesson{display:grid;grid-template-columns:1fr auto;align-items:center;gap:25px;background:#e9eee3;padding:28px 32px;border-radius:20px;position:relative;overflow:hidden}.feature-lesson .eyebrow{color:#698062;font-size:10px}.feature-lesson h3{font-size:23px;margin:10px 0 7px}.feature-lesson p{font-size:13px;max-width:650px;color:#6b796a;line-height:1.7}.feature-lesson .feature-meta{font-size:11px;margin-top:15px}.feature-lesson button{width:58px;height:58px;border-radius:50%;padding:0;flex-shrink:0}.play-triangle{display:block;width:0;height:0;border-top:7px solid transparent;border-bottom:7px solid transparent;border-left:11px solid currentColor;margin-left:3px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.course-card{position:relative;background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0}.course-cover{background:var(--course-bg,#e9eee3);color:var(--course-ink,#516c52);height:112px;padding:19px 23px;display:flex;justify-content:space-between;align-items:center;overflow:hidden}.course-cover strong{font-size:42px;font-weight:550;letter-spacing:-3px}.course-cover .cover-wave{display:flex;gap:5px;align-items:center;opacity:.4;transform:rotate(-10deg)}.cover-wave i{width:4px;height:28px;background:currentColor;border-radius:5px}.cover-wave i:nth-child(2n){height:48px}.cover-wave i:nth-child(3n){height:65px}.course-content{padding:20px}.course-category{font-size:10px;color:var(--muted);margin-bottom:7px}.course-card h3{font-size:17px;line-height:1.5}.course-focus{font-size:12px;margin-top:4px}.course-schedule{font-size:11px;margin-top:13px}.course-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:18px;border-top:1px solid var(--line);padding-top:12px}.course-bottom small{font-size:11px}.course-bottom button{border:0;padding:6px 0;min-height:36px;background:none;color:var(--accent);font-size:12px}.course-menu{position:absolute;right:10px;top:8px;z-index:2}.course-menu summary{list-style:none;color:inherit;font-size:22px;padding:0;width:40px;text-align:center;min-height:36px;border-radius:8px}.course-menu summary::-webkit-details-marker{display:none}.course-menu[open]{background:white;border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 25px #263c3512}.course-menu[open] summary{margin-left:auto}.course-menu button{display:flex;width:100%;border:0;font-size:12px;white-space:nowrap;padding:10px 16px;justify-content:flex-start}.catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.course-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px;flex-wrap:wrap}.search-box input{min-width:220px}.language-filters{display:flex;gap:6px;flex-wrap:wrap}.language-filters button{border:0;background:transparent;color:var(--muted);border-radius:22px;font-size:13px;padding:9px 15px}.language-filters button.active{background:var(--ink);color:#fff}.catalog-footnote{font-size:11px;margin:24px 0}.paused-section{margin:26px 0}.paused-section>summary{font-size:12px}.lesson-list{background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.lesson-row{display:grid;grid-template-columns:60px 1fr auto;gap:18px;align-items:center;padding:21px 24px;border-bottom:1px solid var(--line);min-width:0}.lesson-row:last-child{border-bottom:0}.lesson-date{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#f4f6f0;border-radius:10px;width:54px;min-height:61px;color:#6b7e67;font-size:10px;line-height:1.5}.lesson-date strong{font-size:23px;font-weight:550;letter-spacing:-1px}.lesson-date.unknown strong{font-size:20px}.lesson-body{min-width:0}.lesson-meta{font-size:10px;color:var(--muted);display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:5px}.lesson-body h3{font-size:14px;font-weight:550;line-height:1.65;overflow-wrap:anywhere}.lesson-body p{font-size:11px;margin-top:5px}.lesson-action{min-width:44px;width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:50%;color:var(--accent);background:#fff}.lesson-row .row-actions{display:flex;gap:6px}.lesson-row .row-actions button:not(.lesson-action){font-size:11px;padding:7px 10px}.badge{font-size:10px;color:#6e8161;background:#edf3e8;border-radius:5px;padding:2px 6px;white-space:nowrap}.badge.partial,.badge.failed{background:#f8ece1;color:#9a6f3b}.badge.cancelled{background:#f0f0ed;color:#9b9e96}.badge.recording{background:#e9f2ee;color:#337259}.badge.test{background:#f2ece6;color:#8e7964}.date-group-title{font-size:12px;padding:13px 23px;background:#f7f9f4;border-bottom:1px solid var(--line);font-weight:500;color:#6c7d68}.empty{padding:40px 24px;text-align:center;color:var(--muted);font-size:13px;line-height:1.9;grid-column:1/-1}.library-heading .section-head{margin-top:10px}.library-heading p{font-size:12px;margin-top:6px}.library-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:22px 0 16px}.library-counts{display:flex;gap:14px;font-size:12px;color:var(--muted)}.library-counts b{color:var(--ink);font-weight:600;margin-left:4px}.library-toolbar select{font-size:12px;background:transparent;border-color:transparent}.library-add{margin-top:16px}footer{display:flex;justify-content:space-between;gap:16px;color:#9aa397;font-size:10px;padding:35px 0 0;margin-top:24px;border-top:1px solid var(--line)}
/* Focused listening sheet, with occasional controls below the fold. */
dialog{width:calc(100% - 40px);max-width:660px;max-height:90dvh;border:0;border-radius:24px;padding:28px;background:white;color:var(--ink);box-shadow:0 30px 100px #203f3a24;overscroll-behavior:contain}dialog::backdrop{background:#1e302b55;backdrop-filter:blur(5px)}.dialog-head{display:flex;justify-content:space-between;align-items:flex-start;gap:15px;margin-bottom:20px}.dialog-head h2{font-size:20px}.dialog-head .icon{flex-shrink:0}.listening-dialog{max-width:520px;padding:28px 30px}.player-cover{height:154px;border-radius:15px;background:#e9eee3;color:#66815d;padding:24px;display:flex;align-items:center;position:relative;overflow:hidden;margin-bottom:24px}.player-cover>span:first-child{font-size:60px;letter-spacing:-5px;line-height:1}.cover-lines{display:flex;gap:9px;align-items:center;position:absolute;right:25px;top:20px;height:100px;opacity:.35;transform:rotate(-13deg)}.cover-lines i{display:block;height:30px;width:6px;background:currentColor;border-radius:6px}.cover-lines i:nth-child(2n){height:60px}.cover-lines i:nth-child(3n){height:100px}.cover-caption{position:absolute;left:24px;bottom:17px;font-size:8px;letter-spacing:2px;opacity:.6}.listening-heading{margin-bottom:20px}.lesson-course{display:block;color:var(--accent);font-size:12px;font-weight:650;margin-bottom:9px}.listening-heading h2{font-size:20px;line-height:1.6;letter-spacing:-.6px;overflow-wrap:anywhere}.listening-heading #editor-meta{font-size:11px;margin-top:11px}.listening-heading .icon{position:absolute;top:12px;right:12px;background:#ffffffeb;border-radius:50%;height:40px;width:40px;min-height:40px;min-width:40px;font-size:22px}.listening-player{padding:8px 0 0}.listening-top{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--muted);font-size:10px}.file-label{font-size:10px;background:var(--soft);color:var(--accent);padding:3px 8px;border-radius:5px}.listening-timeline{margin-top:12px}.listening-timeline input{--progress:0%;width:100%;height:26px;min-height:26px;margin:0;padding:0;appearance:none;-webkit-appearance:none;background:transparent;border:0;cursor:pointer}.listening-timeline input::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(to right,var(--accent) var(--progress),#e4e9e0 var(--progress))}.listening-timeline input::-moz-range-track{height:4px;background:#e4e9e0;border-radius:4px}.listening-timeline input::-moz-range-progress{height:4px;background:var(--accent)}.listening-timeline input::-webkit-slider-thumb{appearance:none;width:12px;height:12px;border-radius:50%;background:var(--accent);margin-top:-4px}.listening-timeline input::-moz-range-thumb{width:12px;height:12px;border:0;border-radius:50%;background:var(--accent)}.listening-times{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.listening-transport{display:flex;align-items:center;justify-content:center;gap:36px;margin:24px 0}.listening-player .listen-play{height:66px;width:66px;border-radius:50%;border:0;background:var(--accent);color:white;padding:0}.listen-play svg{width:29px;height:29px}.play-glyph{fill:currentColor}.pause-glyph{display:none;stroke:currentColor;stroke-width:5}.listen-play.playing .play-glyph{display:none}.listen-play.playing .pause-glyph{display:block}.skip-button{position:relative;border:0;background:transparent;border-radius:50%;padding:0;width:48px;height:48px;color:#657967}.skip-button svg{width:29px;height:29px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linejoin:round}.skip-button span{position:absolute;top:17px;left:0;right:0;font-size:9px;text-align:center}.listening-speed{display:flex;justify-content:center;align-items:center;gap:10px;font-size:11px;color:var(--muted);margin:2px 0 22px}.listening-speed select{font-size:12px;border:0;background:#f4f6f1;min-height:36px;padding:5px 12px}.listen-notice{font-size:11px;line-height:1.8;background:#f6f7f2;padding:12px 15px;border-radius:10px;margin:14px 0;color:#78836f}.lesson-info,.audio-options,.trim-panel{border-top:1px solid var(--line);margin-top:12px;padding-top:5px}.lesson-info>summary,.audio-options>summary,.trim-panel>summary{font-size:12px}.lesson-info dl{display:grid;grid-template-columns:70px 1fr;gap:9px;font-size:12px;line-height:1.7}.lesson-info dt{color:var(--muted)}.lesson-info dd{margin:0}.date-edit-row{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-top:7px}.date-edit-row input{min-width:0;flex:1}.date-edit-row button{font-size:12px}.lesson-info label{font-size:12px}.audio-tabs,.editor-actions,.player-settings-links,.button-row{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.audio-tabs button,.editor-actions>*,.player-settings-links button,.button-row button{font-size:12px}.audio-tabs .active{background:var(--soft);border-color:#b6cbb3;color:var(--accent)}.trim-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:15px 0}.trim-fields label{display:flex;flex-direction:column;gap:7px;font-size:12px}.trim-fields button{font-size:11px}.selection-length{grid-column:1/-1;display:flex;gap:12px;align-items:center;font-size:12px;flex-wrap:wrap}.selection-length strong{font-size:22px}.selection-length button{margin-left:auto}.wave-wrap{padding:12px;background:#f4f7f1;border-radius:12px;margin-top:15px}#wave{width:100%;height:110px;display:block;cursor:crosshair}.wave-labels{display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}.boundary-note{padding:13px;background:#f6f7f2;border-radius:12px;margin:15px 0;font-size:12px}.boundary-note p{margin:6px 0;font-size:11px}.boundary-note button{font-size:11px;margin-top:7px}.radio{display:flex;gap:10px;align-items:flex-start;margin:15px 0}.radio small{display:block}.radio input{margin-top:7px}#record-notes{font-size:11px;color:var(--muted);padding-left:18px;line-height:1.9}#course-trim-player{margin-top:14px}#course-trim-dialog>p{font-size:12px;margin:10px 0}#course-trim-sample-panel>label{font-size:12px}#course-trim-result{font-size:12px;margin-top:10px}.toolbar{display:flex;gap:12px;flex-wrap:wrap}.toolbar label{font-size:12px;display:flex;flex-direction:column;gap:5px}.schedule-note{display:flex;justify-content:space-between;gap:15px;margin:20px 0;font-size:12px}.schedule-row{display:grid;grid-template-columns:75px 1fr auto;gap:15px;padding:20px 0;border-bottom:1px solid var(--line)}.schedule-row p{font-size:12px}.schedule-time small{display:block;font-size:10px}.row-actions{display:flex;gap:8px}.schedule-row button{font-size:11px}.notice{background:#f6eddf;padding:12px;border-radius:10px}.card{border-bottom:1px solid var(--line);padding:20px}.card p{font-size:12px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#2d4138;color:#fff;padding:13px 22px;border-radius:12px;font-size:13px;z-index:1000;box-shadow:0 5px 25px #20332822;max-width:calc(100% - 32px);width:max-content;line-height:1.7}
@media(min-width:1350px){main{padding-left:70px;padding-right:70px}}@media(max-width:1100px){main{padding:30px}.rail{width:204px;padding:35px 20px}main{margin-left:204px}.course-grid{gap:12px}.course-content{padding:16px}.course-cover{height:95px;padding:15px}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){body{font-size:14px}.rail{position:static;width:auto;background:transparent;border:0;padding:22px 22px 0;display:block}.brand{font-size:18px;letter-spacing:-.8px}.brand small{display:none}.brand-mark{transform:scale(.8);transform-origin:left center;width:24px}.rail nav{position:fixed;inset:auto 0 0;z-index:40;display:flex;justify-content:space-around;margin:0;padding:7px 10px calc(7px + env(safe-area-inset-bottom));border-top:1px solid #e3e7df;background:#ffffffed;backdrop-filter:blur(16px)}.nav{display:flex;flex:1;flex-direction:column;gap:4px;font-size:10px;min-height:54px;padding:6px;border-radius:12px}.nav svg{width:21px;height:21px}.nav.active{background:transparent;color:var(--accent)}.nav.active svg{stroke-width:2}.rail-bottom{display:none}main{margin:0;padding:25px 22px 95px;max-width:none}.page-header{padding:0;margin:0 0 24px;border:0}.page-header h1{font-size:22px}.page-header .eyebrow{font-size:9px;letter-spacing:1px}.header-note{display:none}.home-heading h2{font-size:28px;line-height:1.45;letter-spacing:-1px}.home-heading{margin-bottom:23px}.home-heading p{font-size:12px;margin-top:9px}.feature-lesson{padding:22px;gap:15px;border-radius:18px}.feature-lesson h3{font-size:19px;margin-top:8px}.feature-lesson p{font-size:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.feature-lesson .feature-meta{font-size:10px;margin-top:12px}.feature-lesson button{height:46px;width:46px}.section-head{margin:28px 0 14px}.section-head h2{font-size:16px}.text-button{font-size:12px}.course-grid{grid-template-columns:1fr;gap:10px}.course-card{display:grid;grid-template-columns:80px 1fr;padding:16px;gap:16px;border-radius:15px;overflow:visible}.course-cover{height:88px;border-radius:10px;padding:10px;justify-content:center}.course-cover strong{font-size:29px;letter-spacing:-1.5px}.course-cover .cover-wave{display:none}.course-content{padding:0;min-width:0}.course-category{font-size:9px;margin-bottom:4px;padding-right:20px}.course-card h3{font-size:16px}.course-focus{font-size:11px;margin-top:3px}.course-bottom{border:0;padding:0;margin-top:9px}.course-bottom small{font-size:10px}.course-bottom button{font-size:11px;min-height:32px;padding:0}.course-schedule{font-size:10px;margin-top:7px}.course-menu{top:8px;right:7px}.course-menu summary{font-size:21px;min-height:32px;width:30px}.course-menu button{min-height:44px}.course-toolbar{gap:12px;margin-bottom:18px}.language-filters{gap:3px;flex-wrap:nowrap;width:100%;overflow-x:auto}.language-filters button{white-space:nowrap;padding:8px 13px;font-size:12px;min-height:38px}.search-box,.search-box input{width:100%;min-width:0}.catalog-grid{grid-template-columns:1fr}.catalog-grid .course-card{grid-template-columns:64px 1fr;gap:14px}.catalog-grid .course-cover{height:74px}.section-intro h2{font-size:22px}.section-intro p{font-size:12px}.lesson-row{grid-template-columns:43px minmax(0,1fr) 38px;gap:12px;padding:18px 14px}.lesson-date{width:43px;min-height:55px;font-size:9px}.lesson-date strong{font-size:21px}.lesson-meta{font-size:9px;gap:5px}.lesson-body h3{font-size:12px;line-height:1.7}.lesson-body p{font-size:10px}.lesson-action{width:38px;height:38px;min-width:38px;min-height:38px}.lesson-row .row-actions{grid-column:2/-1;justify-content:flex-end}.lesson-row .lesson-action{grid-column:3;grid-row:1}.date-group-title{padding:11px 15px;font-size:11px}.library-toolbar{gap:4px}.library-counts{font-size:11px;gap:10px}.library-toolbar select{font-size:11px;max-width:185px;padding:8px 4px}.library-heading .section-head{align-items:flex-start}.library-heading h2{font-size:19px}.library-heading p{font-size:11px}.library-heading .quiet-button{font-size:11px;padding:8px 11px}.paused-section{margin-top:20px}footer{margin-top:30px;padding-top:20px;font-size:9px;flex-direction:column;gap:4px}dialog{width:100%;max-width:none;max-height:94dvh;border-radius:24px 24px 0 0;margin:auto 0 0;padding:26px 22px calc(25px + env(safe-area-inset-bottom));box-shadow:none}.listening-dialog{max-width:none;padding:25px 24px calc(25px + env(safe-area-inset-bottom))}.player-cover{height:138px;margin-bottom:21px}.player-cover>span:first-child{font-size:52px}.listening-heading h2{font-size:18px}.listening-heading #editor-meta{font-size:10px}.listening-heading .icon{top:10px;right:10px}.listening-transport{margin:24px 0;gap:34px}.listening-speed select,input[type=date]{font-size:16px}.listen-notice{font-size:11px}.date-edit-row{flex-wrap:wrap}.date-edit-row input{width:160px}.date-edit-row button{font-size:12px}.editor-actions>*,.button-row button{flex:1;min-width:120px;text-align:center}.player-settings-links{gap:14px}.trim-fields input{width:100%;font-size:16px}.selection-length{gap:8px}.selection-length strong{font-size:20px}.toolbar{display:grid;grid-template-columns:1fr 1fr}.schedule-row{grid-template-columns:55px 1fr}.schedule-row .row-actions{grid-column:1/-1}.schedule-row h3{font-size:14px}.schedule-note{flex-direction:column}.schedule-note button{align-self:flex-start}#toast{bottom:calc(83px + env(safe-area-inset-bottom));font-size:12px}.empty{font-size:12px;padding:30px 15px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

#open-schedule-mobile{display:none}@media(max-width:760px){#open-schedule-mobile{display:inline-flex;align-self:flex-start;font-size:11px}.lesson-body h3{font-size:13px}.lesson-meta{font-size:10px}.course-category{font-size:10px}}

@media(min-width:1280px){#classroom-list{grid-template-columns:repeat(4,minmax(0,1fr))}}