@font-face{font-family:NanumGothic;src:url('/assets/NanumGothic.woff');font-display:swap}@font-face{font-family:NanumRound;src:url('/assets/NanumSquareRoundB.woff');font-weight:700;font-display:swap}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:#fff;color:#18273e;font-family:NanumGothic,Arial,sans-serif;font-size:15px;line-height:1.8}h1,h2,h3,.brand{font-family:NanumRound,NanumGothic,sans-serif}h1,h2,h3,p{margin:0}a{color:inherit;text-underline-offset:5px}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #315bf0;outline-offset:5px}button:disabled{cursor:wait}img{max-width:100%;display:block}em{font-style:normal}button{color:inherit}.shell{width:min(1200px,calc(100% - 96px));margin-inline:auto}.section{padding-block:96px;scroll-margin-top:20px}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid #e6eaf0;backdrop-filter:blur(12px)}.header-inner{max-width:1400px;margin:auto;min-height:91px;padding:16px 40px;display:flex;align-items:center;gap:40px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex-shrink:0;font-size:22px;letter-spacing:-1px;line-height:1.3}.brand b{font-family:NanumGothic;font-weight:400}.brand small{display:block;font-family:NanumGothic;font-size:10px;letter-spacing:0;margin-top:4px;color:#566579}.header-inner nav{display:flex;gap:30px;margin-left:auto}.header-inner nav a,.login{font-size:13px;text-decoration:none;font-weight:700;min-height:44px;display:flex;align-items:center}.header-inner nav a:hover{color:#2148d6}.login{border:1px solid #cbd5e7;border-radius:7px;padding:7px 15px;gap:18px}.login:hover{background:#f2f5ff}.skip{position:fixed;top:-90px;left:20px;z-index:100;background:#173de8;color:white;padding:12px}.skip:focus{top:10px}.hero{display:grid;grid-template-columns:1.04fr 1fr;gap:64px;align-items:center;min-height:630px;padding-block:62px 72px}.eyebrow{font-size:11px;letter-spacing:.13em;font-weight:700;color:#244bd1;display:flex;align-items:center;gap:8px;margin-bottom:20px}.eyebrow>span{width:6px;height:6px;background:#315af5;border-radius:50%}.hero h1{font-size:clamp(35px,3.65vw,52px);line-height:1.35;letter-spacing:-.05em}.hero h1 em{color:#2148dc}.hero-lead{margin-top:23px;color:#566379;font-size:16px;line-height:1.9}.hero-actions{display:flex;gap:10px;margin-top:31px;flex-wrap:wrap}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:20px;padding:12px 20px;border-radius:6px;border:1px solid transparent;text-decoration:none;font-size:13px;font-weight:700;line-height:1.5}.primary{background:#2449e3;color:#fff}.primary:hover{background:#1636b8}.light{background:#edf1fb;color:#1d3c9f}.outline{background:#fff;border-color:#cbd5e7}.hero-detail{display:flex;gap:13px;flex-wrap:wrap;margin-top:25px;color:#657187;font-size:11px}.hero-detail span+span:before{content:'·';padding-right:13px}.hero-media{background:#f2f5fb;border:1px solid #dce5f3;border-radius:12px;padding:15px;box-shadow:0 25px 65px -35px #28428b33;transform:rotate(-1deg)}.preview-top{display:flex;align-items:center;gap:7px;font-size:10px;color:#596b87;padding:1px 3px 13px}.preview-top>span:last-child{margin-left:auto;font-size:9px;letter-spacing:.09em}.live-dot{width:5px;height:5px;background:#048c77;border-radius:50%}.hero-cover{position:relative;display:block;width:100%;aspect-ratio:16/9;padding:0;border:0;background:#17283e;overflow:hidden;border-radius:5px}.hero-cover img{width:100%;height:100%;object-fit:cover}.play-circle{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;border-radius:50%;width:60px;height:60px;background:#fff;color:#2449e3;box-shadow:0 2px 18px #10244044;font-size:21px;padding-left:3px}.hero-cover:hover .play-circle{background:#2449e3;color:#fff}.cover-label{position:absolute;bottom:0;left:0;right:0;background:#17283ee8;color:white;font-size:10px;padding:8px 12px;text-align:left}.preview-bottom{display:flex;align-items:center;justify-content:space-between;padding:17px 5px 4px}.preview-bottom span{color:#61718a;font-size:10px}.preview-bottom h2{font-size:23px;line-height:1.45;margin-top:5px}.round-arrow{display:grid;place-items:center;text-decoration:none;border:1px solid #c6d0e4;border-radius:50%;width:43px;height:43px;color:#2449e3;font-size:23px}.intro-strip{background:#f3f6fc;border-block:1px solid #e7ecf5}.intro-strip>.shell{display:flex;align-items:center;justify-content:space-between;gap:30px;padding-block:26px}.intro-strip p{font-size:12px;line-height:1.7;color:#637086}.intro-strip strong{font-size:16px;color:#233653}.intro-strip>.shell>div{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:700}.intro-strip b{font-weight:400;color:#6a7b9a}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:40px}.section-heading h2,.contact-section h2{font-size:39px;letter-spacing:-.045em;line-height:1.35}.section-heading>p{font-size:13px;color:#5d6d81;line-height:1.9;max-width:440px;margin-bottom:3px}.pathway{display:grid;grid-template-columns:repeat(4,1fr);border-top:2px solid #253f92;border-bottom:1px solid #dce3ee;gap:0;margin-bottom:68px}.pathway article{padding:25px 22px 27px 0;position:relative}.pathway article+article{border-left:1px solid #e5eaf2;padding-left:22px}.path-number{font:700 28px NanumRound;color:#2c52dc}.pathway h3{font-size:19px;margin-top:15px}.pathway p{font-size:12px;color:#687587;margin-top:12px;line-height:1.9}.path-tag{font-size:10px;display:inline-block;margin-top:24px;color:#44618b}.path-optional{background:#f6f9fc}.explore-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:20px}.explore-heading h3{font-size:24px}.explore-heading>span{color:#62738d;font-size:12px}.catalog-tools{display:flex;align-items:flex-end;gap:15px;background:#f7f9fc;border:1px solid #e7ebf2;border-radius:8px;padding:18px}.catalog-tools label{font-size:11px;font-weight:700;display:grid;gap:5px;min-width:200px}.catalog-tools .search-label{flex:1}input,select,textarea{width:100%;min-width:0;border:1px solid #cbd5e3;border-radius:5px;background:#fff;color:#233650;padding:10px 12px;min-height:45px;font-size:13px}select{padding-right:30px}.text-button{background:none;border:0;text-decoration:underline;font-size:12px;padding:10px;min-height:45px;white-space:nowrap}.result-status{font-size:12px;color:#64748b;margin:18px 0}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.module-card{border:1px solid #dce4f0;border-radius:8px;background:white;text-align:left;padding:23px;transition:border-color .2s,transform .2s;display:flex;flex-direction:column;min-height:224px}.module-card:hover{border-color:#3159df;transform:translateY(-3px)}.module-card .category{font-size:10px;color:#3a63a5;letter-spacing:.04em}.module-card h4{font:700 20px/1.45 NanumRound;margin:13px 0 9px}.module-card p{font-size:12px;color:#607087;line-height:1.9}.module-card footer{margin-top:auto;background:none;color:#536b95;padding-top:22px;display:flex;justify-content:space-between;font-size:11px}.more{display:flex;margin:28px auto 0}.catalog-footnote{font-size:11px;color:#6c788b;text-align:center;margin-top:20px}.personal-section{background:#eef4f8;border-block:1px solid #e2e9ef}.personal-layout{display:grid;grid-template-columns:.8fr 1.5fr;gap:58px}.path-picker>label,legend{font-size:13px;font-weight:700}.path-picker>select{margin-top:9px}fieldset{border:0;padding:0;margin:22px 0 0}.grade-options{display:flex;gap:8px;margin-top:10px}.grade-options label{flex:1;cursor:pointer}.grade-options input{position:absolute;opacity:0;width:1px;height:1px}.grade-options span{display:block;text-align:center;border:1px solid #bfcede;background:white;font-size:12px;padding:10px 2px;border-radius:4px}.grade-options input:checked+span{background:#2449e3;color:#fff;border-color:#2449e3}.grade-options input:focus-visible+span{outline:3px solid #2449e3;outline-offset:3px}.path-picker>p{font-size:12px;color:#60738a;line-height:1.9;margin-top:22px}.path-result{background:#fff;padding:30px 35px;border-left:3px solid #2e59d9;min-height:300px}.path-result h3{font-size:24px;line-height:1.4}.path-result .muted{font-size:12px;color:#66778d;margin-top:8px}.path-result h4{font-size:12px;color:#2357a0;margin:22px 0 5px}.path-result p{font-size:14px;line-height:1.9}.path-result .tiny{font-size:11px;color:#61728a;margin-top:20px}.sample-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:40px;align-items:center}.video-wrap video{display:block;width:100%;aspect-ratio:16/9;background:#13243c;border-radius:8px}.video-caption{display:flex;justify-content:space-between;gap:10px;padding:13px 0;font-size:10px;color:#65748a}.small-label{font-size:10px;font-weight:700;color:#3c648d}.sample-aside h3{font-size:25px;line-height:1.5;margin:10px 0 16px}.sample-aside>p{font-size:13px;color:#5e6c7f}.check-list{list-style:none;padding:0;margin:20px 0 24px;display:grid;gap:9px;font-size:12px}.check-list li:before{content:'✓';color:#087f70;margin-right:9px}.text-link{font-size:12px;color:#254acc;font-weight:700}.text-link span{margin-left:15px}.learning-section{border-top:1px solid #e0e7f0}.learning-steps{padding:0;list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:34px}.learning-steps li{border-top:1px solid #b8c9df;padding:24px 0}.learning-steps span{font-size:10px;font-weight:700;color:#315ddd;letter-spacing:.06em}.learning-steps h3{font-size:22px;margin:12px 0}.learning-steps p{font-size:13px;color:#65758a}.university-section{background:#142741;color:#fff}.university-section .eyebrow{color:#9bb9ff}.university-section .section-heading>p{color:#c1cde0}.university-layout{display:grid;grid-template-columns:1fr 1fr;gap:80px}.university-copy{display:grid;gap:27px}.university-copy>div{position:relative;padding-left:34px}.university-copy>div>span{position:absolute;left:0;top:2px;color:#8eaefa;font-size:11px}.university-copy h3{font-size:20px;margin-bottom:9px}.university-copy p{font-size:12px;color:#c0cde0;line-height:1.9}.operations-diagram{background:#203650;padding:25px;border:1px solid #3e536c;border-radius:9px}.diagram-heading{display:flex;justify-content:space-between;gap:8px;font-size:11px;margin-bottom:22px}.diagram-heading .small-label{color:#b2c5de;font-weight:400}.diagram-school,.diagram-record{text-align:center;border:1px solid #5b7392;background:#29435f;padding:12px;border-radius:5px;font-size:14px}.operations-diagram small{display:block;font-size:10px;color:#bccfe7;margin-top:3px}.diagram-branches{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:23px 0;position:relative}.diagram-branches>div{text-align:center;border-top:2px solid #6b92ca;padding-top:9px;font-size:13px}.sections{display:flex;justify-content:center;gap:8px;margin-top:12px}.sections span{font-size:10px;padding:4px 13px;border:1px solid #617a98;border-radius:3px}.diagram-record{border-color:#59b6ac;background:#245257}.operations-diagram>p{font-size:10px;color:#b7c9dd;margin-top:13px;text-align:center}.camp-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;border-top:1px solid #3d526d;margin-top:42px;padding-top:30px}.camp-row h3{font-size:20px;margin:8px 0}.camp-row p{color:#bdcbe0;font-size:12px}.camp-row .small-label{color:#a0d3d0}.contact-section{display:grid;grid-template-columns:1fr 1.15fr;gap:100px}.contact-section>div>p:not(.eyebrow){margin-top:22px;font-size:13px;color:#607188}.contact-mail{display:inline-block;margin-top:23px;font:700 25px NanumRound;color:#2449e3}.contact-mail span{margin-left:16px}form label{display:block;font-size:12px;font-weight:700;margin-bottom:7px}form label>span{color:#6c7d92;font-size:10px;font-weight:400;margin-left:5px}form>input{margin-bottom:17px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:17px}.form-actions{display:flex;gap:12px;margin-top:16px}.fine{font-size:10px!important;color:#718097;line-height:1.8;margin-top:13px!important}#inquiry-status{font-size:12px;color:#165d50;margin-top:12px}.faq-section{padding-top:0}.faq-section h2{font-size:27px;margin-bottom:20px}details{border-top:1px solid #dce3ed}details:last-child{border-bottom:1px solid #dce3ed}summary{padding:19px 0;cursor:pointer;font-size:13px;font-weight:700}details p{font-size:13px;color:#62738a;padding:0 25px 22px 0;max-width:900px}body>footer{background:#f2f5fa;border-top:1px solid #e0e7f1;padding:40px 0 20px}.footer-top{display:flex;align-items:flex-start;gap:60px}.footer-top>p{font-size:12px;color:#65768b}.footer-top>div{margin-left:auto;display:grid;gap:6px}.footer-top>div a{font-size:11px;text-decoration:none;padding:3px}.footer-bottom{display:flex;justify-content:space-between;gap:10px;margin-top:30px;border-top:1px solid #dae2ed;padding-top:18px;font-size:10px;color:#738195}.footer-bottom a{font-size:10px}dialog{width:min(780px,calc(100% - 32px));max-height:85vh;border:1px solid #c9d5e8;border-radius:12px;padding:0;box-shadow:0 20px 90px #091a4155;color:#18273e}dialog::backdrop{background:#101f3b99;backdrop-filter:blur(3px)}.dialog-top{position:sticky;top:0;background:#fff;padding:18px 26px;border-bottom:1px solid #dce4f0;display:flex;justify-content:space-between;align-items:center;z-index:2;font-size:11px}.dialog-top button{border:1px solid #ccd7e7;border-radius:4px;background:white;min-height:40px;padding:7px 12px;font-size:12px}#dialog-content{padding:27px}#dialog-content h2{font-size:27px;line-height:1.4;margin:5px 0 18px}.lesson-detail{border-top:1px solid #dce5f0;padding-top:21px;margin-top:24px}.lesson-detail h3{font-size:18px;line-height:1.5}.lesson-detail>span{font-size:10px;color:#5574a4}.lesson-detail p{font-size:13px;color:#5a6e87;margin:10px 0}.lesson-detail dl{margin:15px 0;font-size:12px;display:grid;grid-template-columns:80px 1fr;gap:9px}.lesson-detail dt{font-weight:700;color:#2358a0}.lesson-detail dd{margin:0}.empty{grid-column:1/-1;padding:35px;background:#f5f8fd;text-align:center;font-size:13px}.load-error{color:#8b332c}.load-error button{margin-top:13px}.path-result a{font-size:12px;color:#2449e3}.no-scroll{overflow:hidden}[hidden]{display:none!important}
@media(min-width:1450px){.hero{min-height:670px}}@media(max-width:1050px){.shell{width:calc(100% - 56px)}.hero{gap:35px}.hero h1{font-size:38px}.header-inner{padding-inline:28px;gap:25px}.header-inner nav{gap:20px}.hero-actions .button{padding-inline:15px;font-size:12px;gap:12px}.section-heading h2,.contact-section h2{font-size:34px}.personal-layout{gap:32px}.contact-section{gap:50px}.university-layout{gap:40px}.intro-strip>.shell>div{gap:15px;font-size:12px}.pathway h3{font-size:17px}.pathway p{font-size:11px}.sample-layout{gap:28px}.sample-aside h3{font-size:22px}}@media(max-width:780px){.header-inner{min-height:74px;flex-wrap:wrap;gap:0;padding:13px 20px 0}.header-inner .brand{font-size:20px}.header-inner nav{order:3;width:100%;margin:10px 0 0;justify-content:center;border-top:1px solid #edf0f5;gap:30px}.header-inner nav a{font-size:12px;min-height:42px}.login{margin-left:auto;min-height:40px;font-size:11px;padding:5px 10px;gap:8px}.shell{width:calc(100% - 40px)}.hero{grid-template-columns:1fr;gap:36px;padding-block:40px 46px;min-height:0}.hero h1{font-size:clamp(32px,6.5vw,45px)}.hero-lead{font-size:14px;margin-top:17px}.hero-actions{margin-top:23px}.hero-detail{margin-top:20px}.hero-media{transform:none;max-width:580px;width:100%}.hero-media .preview-bottom h2 br{display:none}.hero-media .preview-bottom h2{font-size:20px}.intro-strip>.shell{align-items:flex-start;flex-direction:column;gap:17px;padding-block:23px}.intro-strip p br{display:none}.intro-strip strong{margin-left:7px}.intro-strip>.shell>div{gap:12px;font-size:12px;flex-wrap:wrap}.section{padding-block:62px}.section-heading{display:block;margin-bottom:28px}.section-heading>p{margin-top:18px;font-size:12px}.section-heading h2,.contact-section h2{font-size:32px}.eyebrow{margin-bottom:14px;font-size:10px}.pathway{grid-template-columns:repeat(2,1fr);margin-bottom:43px}.pathway article:nth-child(3){border-left:0;padding-left:0;border-top:1px solid #dfe7f1}.pathway article:nth-child(4){border-top:1px solid #dfe7f1}.pathway article{padding-top:20px}.pathway article p br{display:none}.pathway article p{font-size:12px}.path-tag{font-size:9px}.explore-heading{align-items:flex-start}.explore-heading h3{font-size:21px}.explore-heading>span{font-size:10px;max-width:120px;text-align:right}.catalog-tools{flex-wrap:wrap;padding:14px;gap:12px}.catalog-tools label{min-width:0}.catalog-tools .search-label{flex-basis:100%}.catalog-tools label:not(.search-label){flex:1}.text-button{font-size:11px}.module-grid{grid-template-columns:repeat(2,1fr);gap:12px}.module-card{padding:18px;min-height:215px}.module-card h4{font-size:18px}.personal-layout,.sample-layout,.university-layout,.contact-section{grid-template-columns:1fr;gap:30px}.path-result{padding:24px;min-height:0}.path-result h3{font-size:22px}.sample-aside h3 br{display:none}.sample-aside h3{font-size:23px}.video-caption{font-size:9px}.learning-steps{grid-template-columns:1fr;gap:0;margin:0}.learning-steps li{padding:20px 0}.learning-steps h3{font-size:21px}.learning-steps p{font-size:12px}.university-copy>div{padding-left:30px}.camp-row{gap:25px}.camp-row h3{font-size:18px}.footer-top{flex-wrap:wrap;gap:25px}.footer-top>p{font-size:11px}.footer-top>div{margin:0;display:flex;flex-wrap:wrap;width:100%;gap:18px}.footer-bottom{font-size:9px}.faq-section{padding-top:0}html{scroll-padding-top:130px}.hero{scroll-margin-top:130px}}@media(max-width:420px){.brand img{width:31px;height:31px}.header-inner .brand{gap:8px;font-size:18px}.brand small{font-size:8px}.login{font-size:10px}.hero h1{font-size:33px}.hero-lead br{display:none}.hero-detail{font-size:10px;gap:9px}.hero-detail span+span:before{padding-right:9px}.intro-strip>.shell>div{gap:9px;font-size:10px}.module-grid{grid-template-columns:1fr}.module-card{min-height:190px}.camp-row{grid-template-columns:1fr;gap:25px}.video-caption{flex-direction:column;gap:3px}.pathway h3{font-size:16px}.pathway article+article{padding-left:15px}.pathway article:nth-child(3){padding-left:0}.pathway article{padding-right:13px}.contact-section h2{font-size:31px}.form-actions{gap:8px}.form-actions .button{font-size:12px;padding-inline:14px;gap:10px}.footer-bottom{flex-direction:column}.diagram-heading{font-size:10px}.diagram-heading .small-label{font-size:8px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

@media(max-width:780px){.hero-media .preview-bottom h2 br{display:block}.preview-bottom{gap:15px}.preview-bottom>div{min-width:0}.preview-bottom .round-arrow{flex-shrink:0}.hero-media .preview-bottom h2{font-size:19px}}

/* Every module: four real previews per page; teaching details expand on request. */
.preview-dialog{width:min(800px,calc(100% - 24px));max-height:calc(100vh - 24px);max-height:calc(100dvh - 24px);overscroll-behavior:contain;background:#fff}
.preview-dialog .dialog-top{min-height:54px;padding:9px 22px;gap:16px}
.preview-dialog .dialog-top button{min-height:36px;padding:5px 12px;flex-shrink:0}
.preview-dialog #dialog-content{padding:18px 22px 14px}
.preview-kicker{font-size:10px;letter-spacing:.06em;color:#54708e;font-weight:700;line-height:1.6}
.preview-dialog #dialog-content h2{font-size:25px;line-height:1.35;letter-spacing:-.035em;margin:5px 0 4px}
.preview-intro{color:#62738a;font-size:12px;line-height:1.7}
.lesson-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:15px}
.lesson-preview{min-width:0;padding:0;text-align:left;border:1px solid #dce4ef;border-radius:8px;background:#fff;overflow:hidden;display:flex;flex-direction:column;transition:border-color .2s,box-shadow .2s}
.lesson-preview:hover{border-color:#3158dc;box-shadow:0 5px 20px #1f3f8b13}
.lesson-preview:disabled{cursor:default;color:#6b7788}
.preview-thumb{position:relative;display:block;width:100%;height:clamp(96px,15dvh,136px);background:#eff3f8;overflow:hidden}
.preview-thumb img{width:100%;height:100%;object-fit:contain}
.preview-tile-play{position:absolute;inset:0;margin:auto;display:grid;place-items:center;width:38px;height:38px;padding-left:2px;border-radius:50%;background:#fffef0f2;color:#2449e3;font-size:14px;box-shadow:0 2px 14px #10244026}
.lesson-preview:hover .preview-tile-play{background:#2449e3;color:#fff}
.preview-tile-number{position:absolute;top:7px;left:8px;border-radius:3px;background:#142741e8;color:#fff;font-size:9px;line-height:1.6;padding:1px 6px;font-weight:700}
.preview-tile-copy{display:flex;flex:1;flex-direction:column;gap:5px;padding:10px 12px 11px}
.preview-tile-copy strong{display:block;font-family:NanumRound,NanumGothic,sans-serif;font-size:15px;line-height:1.4;min-height:2.8em;word-break:keep-all;overflow-wrap:anywhere}
.preview-tile-copy>span{display:flex;justify-content:space-between;font-size:10px;line-height:1.6;color:#3159bb;font-weight:700}
.preview-unavailable{position:absolute;inset:0;display:grid;place-items:center;font-size:11px;color:#687990}
.preview-more{margin-top:12px;border-block:1px solid #e3e9f2}
.preview-more summary{padding:10px 0;font-size:11px;color:#526b8c;line-height:1.8}
.preview-more>p{padding:0 0 14px;font-size:12px;line-height:1.8}
.preview-more .fine{margin-top:0!important;padding-bottom:14px}
.preview-objective{border-top:1px solid #e7ecf3;padding-block:14px}
.preview-objective h3{font-size:14px;line-height:1.6}
.preview-objective p{font-size:12px;margin-top:6px;padding:0}
.preview-objective dl{display:grid;grid-template-columns:74px 1fr;gap:7px;font-size:11px;line-height:1.8;margin:12px 0 0}
.preview-objective dt{font-weight:700;color:#315b94}
.preview-objective dd{margin:0}
.preview-back{border:0;background:none;min-height:36px;padding:3px 0;margin-bottom:5px;display:inline-flex;align-items:center;gap:8px;color:#3156b3;font-size:12px;font-weight:700}
.preview-player-heading{margin-bottom:14px}
.preview-dialog .preview-player-heading h2{font-size:23px!important;max-width:660px}
.dialog-video-wrap{background:#13243c;border:1px solid #dce5f0;border-radius:7px;overflow:hidden}
.dialog-video-wrap video{display:block;width:100%;aspect-ratio:16/9;max-height:52dvh;background:#13243c;object-fit:contain}
.preview-player-meta{display:flex;justify-content:space-between;gap:12px;color:#64758c;font-size:10px;line-height:1.7;padding-top:9px}
.preview-player-meta>span:last-child{flex-shrink:0}
.preview-player-status{font-size:11px;line-height:1.7;color:#315778}
.preview-player-status:empty{display:none}
.preview-player-nav{display:flex;justify-content:space-between;gap:10px;border-top:1px solid #e4eaf3;padding-top:10px;margin-top:12px}
.preview-player-nav button{background:white;border:1px solid #ccd8e8;border-radius:5px;padding:7px 10px;min-height:36px;font-size:11px}
.preview-player-nav button:disabled{color:#9ba8ba;border-color:#e5eaf2;cursor:default}
.preview-player-details p strong{font-size:11px;color:#315b94}
@media(max-width:600px){
 .preview-dialog .dialog-top{padding:8px 14px;min-height:50px;font-size:10px}
 .preview-dialog #dialog-content{padding:14px 14px 10px}
 .preview-dialog #dialog-content h2{font-size:21px}
 .preview-kicker{font-size:9px}
 .preview-intro{font-size:11px}
 .lesson-preview-grid{gap:10px;margin-top:13px}
 .preview-thumb{height:auto;aspect-ratio:16/9}
 .preview-thumb img{position:absolute;inset:0}
 .preview-tile-copy{padding:9px 9px 10px;gap:5px}
 .preview-tile-copy strong{font-size:13px;line-height:1.4;min-height:4.2em}
 .preview-tile-copy>span{font-size:9px}
 .preview-tile-play{width:32px;height:32px;font-size:12px}
 .preview-tile-number{top:5px;left:5px;font-size:8px;padding-inline:5px}
 .preview-more{margin-top:10px}
 .preview-more summary{font-size:10px;padding:9px 0}
 .preview-dialog .preview-player-heading h2{font-size:20px!important;line-height:1.4}
 .preview-player-heading{margin-bottom:11px}
 .preview-player-meta{font-size:9px;gap:8px}
 .preview-player-nav{gap:6px}
 .preview-player-nav button{font-size:10px;padding:7px;min-height:36px}
 .preview-objective dl{grid-template-columns:65px 1fr}
}
@media(max-height:700px) and (min-width:601px){
 .preview-dialog #dialog-content{padding-top:12px}
 .preview-dialog #dialog-content h2{font-size:22px}
 .preview-thumb{height:clamp(82px,13dvh,100px)}
 .lesson-preview-grid{gap:10px;margin-top:10px}
 .preview-tile-copy{padding-block:7px}
 .preview-tile-copy strong{font-size:14px}
}

.preview-intro>span{white-space:nowrap;margin-left:5px;color:#3159bb}
.preview-grid-pages{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;font-size:11px;color:#526b8c}
.preview-grid-pages button,.preview-load-status button{border:1px solid #ccd8e8;border-radius:5px;background:#fff;min-height:36px;padding:5px 12px;font-size:11px}
.preview-grid-pages button:disabled{cursor:default;color:#9ba8ba;border-color:#e5eaf2}
.preview-grid-pages small{font-size:10px}
.preview-load-status{font-size:11px;color:#776044;line-height:1.6;margin-top:10px}
.preview-load-status button{margin-left:5px}
@media(max-width:600px){
 .preview-grid-pages{font-size:10px;gap:6px;margin-top:8px}
 .preview-grid-pages button{padding:5px 9px;font-size:10px}
 .preview-grid-pages small{font-size:9px}
}

/* Full lectures use their current canonical player; short previews remain local. */
.full-lecture .preview-tile-copy>span{color:#187463}
.dialog-video-wrap iframe{display:block;border:0;width:100%;aspect-ratio:16/9;max-height:52dvh;background:#13243c}
.full-player-help{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px;font-size:10px;line-height:1.6;color:#64758c}
.full-player-help a{flex-shrink:0;color:#3156b3;font-weight:700;min-height:36px;display:flex;align-items:center}
@media(max-width:600px){.full-player-help{font-size:9px;gap:8px}}
@media(max-height:650px) and (min-width:601px){
 .preview-dialog:not(.preview-playing) .preview-thumb{height:60px}
 .preview-dialog:not(.preview-playing) .dialog-top{min-height:42px;padding-block:3px}
 .preview-dialog:not(.preview-playing) #dialog-content{padding-block:10px}
 .preview-dialog:not(.preview-playing) #dialog-content h2{font-size:20px;margin-block:2px}
 .preview-dialog:not(.preview-playing) .preview-more{margin-top:8px}
 .preview-dialog:not(.preview-playing) .preview-more summary{padding-block:7px}
}
@media(max-height:450px) and (min-width:601px){
 .preview-dialog:not(.preview-playing) .preview-kicker{font-size:9px;line-height:1.3}
 .preview-dialog:not(.preview-playing) .preview-intro{font-size:10px;line-height:1.4}
 .preview-dialog:not(.preview-playing) #dialog-content h2{font-size:18px;line-height:1.2}
 .preview-dialog:not(.preview-playing) #dialog-content{padding:6px 16px}
 .preview-dialog:not(.preview-playing) .lesson-preview-grid{gap:6px;margin-top:6px}
 .preview-dialog:not(.preview-playing) .lesson-preview{display:grid;grid-template-columns:90px minmax(0,1fr);align-items:stretch;min-height:70px}
 .preview-dialog:not(.preview-playing) .preview-thumb{height:100%;min-height:68px}
 .preview-dialog:not(.preview-playing) .preview-tile-copy{padding:5px 7px;gap:3px;justify-content:center}
 .preview-dialog:not(.preview-playing) .preview-tile-copy strong{font-size:12px;line-height:1.3;min-height:0}
 .preview-dialog:not(.preview-playing) .preview-tile-copy>span{font-size:9px;line-height:1.4}
 .preview-dialog:not(.preview-playing) .preview-tile-play{width:26px;height:26px;font-size:10px}
 .preview-dialog:not(.preview-playing) .preview-grid-pages{margin-top:5px}
 .preview-dialog:not(.preview-playing) .preview-grid-pages button{min-height:30px;padding-block:3px}
 .preview-dialog:not(.preview-playing) .preview-more{margin-top:5px}
 .preview-dialog:not(.preview-playing) .preview-more summary{padding-block:5px;line-height:1.4;font-size:10px}
}

.proof-section{padding-top:64px}.proof-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.proof-grid article{border:1px solid #dce5f3;border-radius:18px;padding:26px;background:#fff}.proof-grid article span{font-size:12px;font-weight:700;letter-spacing:.03em;color:#2450cd}.proof-grid article h3{font-size:20px;margin:14px 0 9px;color:#142849}.proof-grid article p,.proof-note p{color:#536780;line-height:1.7;font-size:14px}.proof-grid article a{display:inline-block;margin-top:14px;color:#2045c4;font-weight:700;font-size:13px}.proof-note{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-top:18px;padding:24px 26px;background:#edf3ff;border-radius:18px}.proof-note strong{color:#152b54}.proof-note p{margin:8px 0 0}.proof-note .button{flex-shrink:0}.lecture-notes{margin-top:20px;padding:20px;border-radius:14px;border:1px solid #dbe5f4;background:#f6f9ff;color:#203553}.lecture-notes h3{font-size:17px;margin:0 0 8px}.lecture-notes h3 span{font-size:11px;font-weight:500;color:#55708d}.lecture-notes p,.lecture-notes label{font-size:12px;line-height:1.6;color:#536780}.lecture-notes label{display:block;font-weight:700;margin:12px 0 5px}.lecture-notes textarea{width:100%;box-sizing:border-box;border:1px solid #cbd9ee;border-radius:8px;padding:10px;font:inherit;font-size:14px;resize:vertical}.note-actions{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:10px}.note-actions button{padding:8px 12px;border:1px solid #b8cbee;background:#fff;border-radius:7px;color:#234dac;font-weight:700}.note-actions span{font-size:12px;color:#285e52}.lecture-notes .note-foot{font-size:11px;margin-bottom:0}@media(max-width:700px){.proof-grid{grid-template-columns:1fr}.proof-note{align-items:flex-start;flex-direction:column}.proof-section{padding-top:35px}}
.study-tools{margin-top:18px;padding:20px;border:1px solid #dbe5f4;background:#fff;border-radius:14px;color:#203553}.study-tools h3{font-size:17px;margin:0 0 8px}.study-tools h3 span{font-size:11px;font-weight:500;color:#55708d}.study-tools p,.study-tools label{font-size:12px;line-height:1.6;color:#536780}.caption-search label{display:block;font-weight:700;margin:14px 0 5px}.caption-search>div{display:flex;gap:8px}.caption-search input{flex:1;min-width:0;padding:10px;border:1px solid #cbd9ee;border-radius:8px;font:inherit}.study-tools button{border:1px solid #b8cbee;border-radius:7px;background:#fff;color:#234dac;font-weight:700;padding:8px 12px;cursor:pointer}.caption-results{display:grid;gap:6px;max-height:250px;overflow:auto}.caption-results .caption-result{text-align:left;line-height:1.5;font-size:12px;font-weight:500}.bookmark-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:20px}.bookmark-heading h4{font-size:14px;margin:0}.bookmark-list{display:grid;gap:6px;font-size:12px;color:#536780}.bookmark-row{display:flex;justify-content:space-between;gap:8px}.bookmark-row button:first-child{flex:1;text-align:left}.study-tools .bookmark-hint{font-size:11px}.study-status,.bookmark-status{min-height:1.2em}