:root{--tk-ink:#172b4d;--tk-muted:#66758e;--tk-line:#e4eaf2;--tk-blue:#315ce7;--tk-bg:#f5f7fb}
body{background:var(--tk-bg)!important;color:var(--tk-ink)}.topbar{display:none!important}main#app,main#app.app-landing{max-width:none!important;width:100%;padding:0!important;margin:0!important}button,input,select,textarea{font-family:inherit}.tk-shell *{box-sizing:border-box}.tk-shell button{font-family:inherit;cursor:pointer}.tk-shell button:focus-visible,.tk-shell input:focus-visible{outline:3px solid #7796ff;outline-offset:3px}.tk-shell [hidden]{display:none!important}
.tk-shell{min-height:100vh;display:grid;grid-template-columns:244px minmax(0,1fr);font-size:15px;line-height:1.7}.tk-sidebar{background:#fff;border-right:1px solid var(--tk-line);padding:26px 18px;position:sticky;top:0;height:100vh;overflow:auto;display:flex;flex-direction:column;gap:22px;z-index:80}.tk-brand{display:grid;grid-template-columns:42px 1fr;gap:0 10px;background:none;border:0;text-align:left;padding:0;color:var(--tk-ink);font-size:14px;font-weight:800}.tk-brand-mark{grid-row:span 2;background:var(--tk-blue);color:white;border-radius:13px;width:42px;height:44px;display:grid;place-items:center}.tk-brand small{font-size:10px;font-weight:400;color:var(--tk-muted)}.tk-nav{display:grid;gap:6px}.tk-nav-item{display:grid;grid-template-columns:22px 1fr;column-gap:10px;border:0;border-radius:12px;background:transparent;text-align:left;padding:11px 12px;color:#5a6980;font-size:13px;line-height:1.6;min-height:48px}.tk-nav-item small{grid-column:2;font-size:10px;opacity:.75}.tk-nav-item.is-current{background:#edf2ff;color:#315ce7;font-weight:700}.tk-nav-item:hover,.tk-extra-link:hover{background:#f1f5ff}.tk-nav-icon{font-size:19px;grid-row:span 2}.tk-nav-caption{margin:0;color:#98a3b5;font-size:11px;letter-spacing:2px}.tk-extras{font-size:12px;color:var(--tk-muted)}.tk-extras summary{cursor:pointer;padding:8px}.tk-extra-link{display:block;border:0;background:transparent;padding:9px 8px;text-align:left;width:100%;border-radius:9px;color:#586a83;font-size:12px}.tk-sidebar-footer{margin-top:auto;border-top:1px solid var(--tk-line);padding-top:15px}.tk-sidebar-footer small{font-size:10px;color:#8a96a8}.tk-area{min-width:0}.tk-header{min-height:84px;padding:16px 34px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--tk-line);background:#fff;position:sticky;top:0;z-index:60}.tk-page-name{font-size:14px;font-weight:600;margin:0}.tk-header-tools{margin-left:auto;display:flex;align-items:center;gap:18px}.tk-header-search{border:0;background:transparent;color:#7a879a;font-size:12px}.tk-menu-toggle{display:none}.tk-content{max-width:1320px;margin:auto;padding:32px 34px 48px;overflow-wrap:anywhere;min-height:calc(100vh - 160px)}.tk-button{background:#fff;border:1px solid #dfe5f0;padding:11px 18px;border-radius:11px;color:var(--tk-ink);font-size:13px;line-height:1.6;min-height:44px}.tk-primary{background:var(--tk-blue);color:#fff;border-color:var(--tk-blue);box-shadow:0 5px 13px #315ce71a}.tk-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.tk-welcome{padding:36px 40px!important;border-radius:24px;background:#eaf0ff!important;position:relative;overflow:hidden;min-height:280px;margin-bottom:32px}.tk-welcome h1{font-size:clamp(28px,3vw,42px);line-height:1.5;letter-spacing:-1px;margin:12px 0 0;max-width:70%}.tk-welcome p{max-width:70%;font-size:13px;color:#66799e;margin:8px 0}.tk-welcome .tk-eyebrow{font-size:10px;color:#4466b4;letter-spacing:1px;font-weight:600}.tk-welcome .tk-welcome-ko{font-size:20px;color:#506da4}.tk-welcome-art{position:absolute;right:36px;top:44px;display:grid;grid-template-columns:1fr 1fr;gap:13px;transform:rotate(-7deg);width:180px}.tk-welcome-art span{display:grid;place-items:center;border-radius:20px;width:82px;height:100px;background:#fff;font-size:48px;color:#4567df;box-shadow:0 15px 28px #5470b51c}.tk-welcome-art span:nth-child(2){margin-top:32px;background:#4567df;color:#fff;transform:rotate(15deg)}.tk-welcome-art small{grid-column:span 2;text-align:center;font-size:12px;color:#7686ab}.tk-section-title{margin:25px 0 18px}.tk-section-title h2{font-size:20px;margin:0 0 6px;line-height:1.6}.tk-section-title p{margin:0;color:var(--tk-muted);font-size:12px}.tk-course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tk-course{background:white;padding:24px;border-radius:20px;border:1px solid var(--tk-line);display:flex;align-items:flex-start;flex-direction:column;min-height:292px;box-shadow:0 3px 7px #17315a03}.tk-course-icon{width:58px;height:58px;display:grid;place-items:center;border-radius:16px;background:#edf2ff;color:#365ed3;font-size:24px;font-weight:700;margin-bottom:18px}.tk-purple .tk-course-icon{background:#f1edff;color:#8862d6;font-size:17px}.tk-green .tk-course-icon{background:#e8f5ef;color:#358d6b;font-size:19px}.tk-eyebrow{font-size:10px;color:#8390a5;margin:0 0 5px}.tk-course h3{font-size:17px;margin:0 0 8px;line-height:1.6}.tk-course-description{font-size:12px;color:var(--tk-muted);margin:0 0 20px}.tk-link-button{margin-top:auto;background:none;border:0;color:var(--tk-blue);font-size:12px;padding:8px 0;text-align:left;min-height:40px}.tk-home-bottom{display:grid;grid-template-columns:1.2fr 1fr;gap:20px;margin-top:26px}.tk-panel{background:#fff;padding:24px!important;border:1px solid var(--tk-line);border-radius:20px}.tk-panel .tk-section-title{margin-top:0}.tk-step{padding:13px 0;font-size:13px;border-bottom:1px solid #edf0f6}.tk-step:last-child{border:0;margin-bottom:0}.tk-lao-notice h2{font-size:20px;line-height:1.6;margin:8px 0 12px}.tk-lao-notice p{font-size:12px;color:var(--tk-muted)}.tk-badge{display:inline-block;background:#f0f3f9;color:#7b879c;font-size:11px;border-radius:30px;padding:6px 12px}.tk-footer{display:flex;gap:20px;justify-content:center;align-items:center;flex-wrap:wrap;color:#97a1b3;font-size:10px;padding:20px;border-top:1px solid var(--tk-line)}.tk-text-link,.tk-back{border:0;background:transparent;color:#7889a1;font-size:11px;padding:8px}.tk-back{margin-bottom:20px}.tk-catalog-tools{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:26px 0}.tk-catalog-tools label{display:grid;gap:6px;flex:1;max-width:480px;font-size:12px;color:#697a96}.tk-search{padding:13px 16px;border:1px solid #dce3f0;border-radius:12px;background:#fff;width:100%;font-size:14px;color:#243b60}.tk-lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tk-lesson-card{position:relative;padding:24px;background:#fff;border:1px solid var(--tk-line);border-radius:18px;min-height:220px;display:flex;flex-direction:column;align-items:flex-start}.tk-lesson-card h2{font-size:16px;line-height:1.8;margin:5px 0 10px}.tk-lesson-card>p:not(.tk-eyebrow){font-size:12px;color:var(--tk-muted)}.tk-lesson-number{align-self:flex-end;font-size:24px;font-weight:700;color:#d1dbef}.tk-catalog>.tk-panel{margin-top:28px}.tk-empty{text-align:center;padding:40px;color:var(--tk-muted)}
/* Existing content and handlers are retained inside the new shell. */
.tk-content>.home-view,.tk-content>.auth-view,.tk-content>.profile-view,.tk-content>.admin-view{max-width:none!important;margin:0!important}.tk-content .home-cover{display:none}.tk-content .public-info-hero{border-radius:20px}.tk-content .public-info-hero,.tk-content .public-info-section{max-width:none}.tk-content .admin-tabs{display:flex;flex-wrap:wrap;gap:8px;background:transparent;margin:0 0 20px}.tk-content .admin-tabs button{border-radius:10px;border:1px solid #dce4f2;background:#fff;color:#63738d;padding:12px 16px}.tk-content .admin-tabs button.active{background:#315ce7;color:#fff;border-color:#315ce7}.tk-content #adminBody{background:#fff;border:1px solid var(--tk-line);border-radius:18px;padding:24px}.tk-content .auth-view{max-width:560px!important;margin:20px auto!important}.tk-content img,.tk-content video{max-width:100%}.tk-content .home-hero{background:#eaf0ff;border-radius:20px;padding:25px}.tk-content .lesson-card,.tk-content .topic-card,.tk-content .profile-card{border-radius:15px!important;border:1px solid var(--tk-line);box-shadow:none}.tk-content .public-info-view{max-width:none}
@media(min-width:1600px){.tk-content{padding-top:42px}.tk-shell{grid-template-columns:270px minmax(0,1fr)}}
@media(max-width:1120px){.tk-shell{grid-template-columns:210px minmax(0,1fr)}.tk-sidebar{padding:24px 12px}.tk-content{padding:25px}.tk-header{padding:16px 25px}.tk-welcome{padding:28px!important}.tk-welcome-art{right:18px;width:140px}.tk-welcome-art span{width:62px;height:80px;font-size:35px}.tk-welcome h1,.tk-welcome p{max-width:73%}.tk-course-grid,.tk-lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tk-course-grid .tk-course:last-child{grid-column:span 2;min-height:230px}.tk-home-bottom{grid-template-columns:1fr}}
@media(max-width:760px){.tk-shell{display:block}.tk-sidebar{position:fixed;left:0;top:0;width:260px;height:100dvh;transform:translateX(-100%);transition:transform .18s ease;box-shadow:15px 0 60px #152b5720}.tk-menu-open .tk-sidebar{transform:translateX(0)}.tk-header{padding:13px 16px;min-height:70px;gap:10px}.tk-menu-toggle{display:block;border:1px solid #e2e7f1;border-radius:10px;background:#fff;padding:8px 11px;font-size:19px;color:#45608c}.tk-header-tools{gap:8px}.tk-header-search{font-size:0}.tk-header-search:first-letter{font-size:24px}.tk-header .tk-button{font-size:11px;padding:9px 11px}.tk-page-name{font-size:11px;max-width:125px}.tk-content{padding:20px 16px 30px}.tk-welcome{padding:24px!important;min-height:300px}.tk-welcome h1{font-size:29px;max-width:100%;position:relative;z-index:1}.tk-welcome p{max-width:100%;position:relative;z-index:1}.tk-welcome .tk-welcome-ko{font-size:18px}.tk-welcome-art{display:none}.tk-welcome .tk-actions{gap:8px}.tk-welcome .tk-button{font-size:12px}.tk-course-grid,.tk-lesson-grid{grid-template-columns:1fr;gap:14px}.tk-course-grid .tk-course:last-child{grid-column:auto}.tk-course{min-height:250px;padding:23px}.tk-section-title h2{font-size:19px}.tk-panel{padding:20px!important}.tk-catalog-tools{display:grid;gap:14px}.tk-content #adminBody{padding:15px}.tk-content .admin-tabs button{font-size:11px;padding:10px}.tk-footer{gap:10px;padding:17px}.tk-content .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){.tk-sidebar{transition:none}}

.tk-menu-close,.tk-backdrop{display:none}.tk-plan-summary{font-size:12px;color:#6e7f99;margin:0 0 20px}
@media(max-width:760px){.tk-sidebar{visibility:hidden;pointer-events:none}.tk-menu-open .tk-sidebar{visibility:visible;pointer-events:auto}.tk-menu-close{display:block;align-self:flex-end;background:#f1f4fc;border:0;border-radius:9px;width:38px;height:38px;color:#516685;font-size:24px;margin-bottom:-12px}.tk-menu-open .tk-backdrop{display:block;position:fixed;inset:0;background:#10244166;border:0;border-radius:0;z-index:70;width:100%;height:100%}}

.tk-foundation{display:grid;gap:24px}.tk-foundation .tk-actions{flex-wrap:wrap}.tk-reading,.tk-feedback{white-space:pre-wrap;line-height:1.9;overflow-wrap:anywhere}.tk-answer{display:flex;align-items:center;gap:12px;margin:12px 0;flex-wrap:wrap}.tk-answer input[type=radio]{width:20px;height:20px;flex:none}.tk-answer select{max-width:100%;min-width:0}.tk-foundation fieldset{min-width:0}.tk-foundation legend{font-weight:700;padding:0 8px}.tk-foundation [aria-pressed=true]{background:#e7edff;border-color:#4056d8}.tk-objective{line-height:1.8}