:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f4f6fb;--surface:#fff;--surface-2:#eef1f8;--border:#dde3ef;--text:#161b2e;--text-muted:#667089;--accent:#3a63e0;--accent-contrast:#fff;--success:#1f9254;--danger:#d6395a;--shadow:0 1px 2px #161b2e0a, 0 8px 24px #161b2e0f}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}a{color:inherit}button{font-family:inherit}.app-shell{flex-direction:column;min-height:100%;display:flex}.app-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 28px;display:flex}.app-logo{color:var(--text);font-size:18px;font-weight:700;text-decoration:none}.app-header-user{color:var(--text-muted);align-items:center;gap:10px;font-size:14px;display:flex}.app-avatar{border-radius:50%;width:28px;height:28px}.app-logout{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:999px;padding:6px 14px;font-size:13px}.app-logout:hover{border-color:var(--accent);color:var(--text)}.app-main{flex:1;padding:32px 28px 64px}.login-page{background:var(--bg);justify-content:center;align-items:center;min-height:100vh;display:flex}.login-card{text-align:center;border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:20px;max-width:360px;padding:48px 40px}.login-card h1{margin:0 0 8px;font-size:24px}.login-card p{color:var(--text-muted);margin:0 0 24px}.login-button{background:var(--accent);color:var(--accent-contrast);cursor:pointer;border:none;border-radius:999px;width:100%;padding:12px 24px;font-weight:600}.login-error{color:var(--danger);margin-top:16px;font-size:14px}.login-demo-note{color:var(--text-muted);font-size:12px;line-height:1.5;margin-top:16px!important}.login-demo-note code{background:var(--surface-2);border-radius:4px;padding:1px 5px}.catalog-page{max-width:1600px;margin:0 auto}.catalog-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px;display:flex}.catalog-page h1{margin:0 0 4px;font-size:28px}.catalog-subtitle{color:var(--text-muted);margin:0;font-size:14px}.catalog-search{border:1px solid var(--border);background:var(--surface);width:360px;max-width:100%;box-shadow:var(--shadow);border-radius:999px;align-items:center;gap:10px;padding:10px 16px;display:flex}.catalog-search-icon{color:var(--text-muted);flex-shrink:0}.catalog-search input{color:var(--text);background:0 0;border:none;outline:none;flex:1;font-size:14px}.catalog-search input::placeholder{color:var(--text-muted)}.catalog-error{color:var(--danger)}.catalog-empty{color:var(--text-muted)}.catalog-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px;display:grid}.course-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);color:var(--text);border-radius:16px;flex-direction:column;text-decoration:none;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;overflow:hidden}.course-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 8px #161b2e0f,0 16px 32px #161b2e1a}.course-card-thumb{aspect-ratio:16/9;background:var(--surface-2);width:100%;position:relative;overflow:hidden}.course-card-thumb img{object-fit:cover;width:100%;height:100%;display:block}.course-card-thumb-initial{color:#161b2e59;justify-content:center;align-items:center;font-size:42px;font-weight:700;display:flex;position:absolute;inset:0}.course-card-body{padding:20px 22px 22px}.course-card h2{margin:0 0 8px;font-size:18px}.course-card p{color:var(--text-muted);margin:0 0 14px;font-size:14px;line-height:1.5}.course-card-meta{color:var(--text-muted);gap:6px;font-size:13px;display:flex}.course-card-progress{color:var(--success);margin-top:12px;font-size:13px;font-weight:600}.course-detail-page{max-width:1600px;margin:0 auto}.back-link{color:var(--text-muted);margin-bottom:20px;font-size:14px;text-decoration:none;display:inline-block}.back-link:hover{color:var(--accent)}.course-error{color:var(--danger)}.course-hero{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);border-radius:20px;align-items:center;gap:32px;margin-bottom:36px;padding:28px;display:flex}.course-hero-image{aspect-ratio:16/9;background:var(--surface-2);border-radius:14px;flex:0 0 360px;overflow:hidden}.course-hero-image img{object-fit:cover;width:100%;height:100%;display:block}.course-hero-body h1{margin:0 0 10px;font-size:30px}.course-detail-description{color:var(--text-muted);margin:0 0 16px;font-size:15px;line-height:1.6}.course-hero-meta{color:var(--text-muted);gap:6px;font-size:14px;font-weight:600;display:flex}.modules-heading{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:0 0 18px;font-size:15px}.module-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;display:grid}.module-card{border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);color:var(--text);border-radius:14px;align-items:center;gap:16px;padding:18px 20px;text-decoration:none;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;position:relative}.module-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 8px #161b2e0f,0 16px 32px 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video{object-fit:cover;width:100%;height:100%;display:block}.illustration-stage{background:#0b1220;border-radius:16px;width:100%;height:100%;position:relative;overflow:hidden}.illustration-stage--empty{color:#6b7690;justify-content:center;align-items:center;font-size:14px;display:flex}.illustration-frame{border:none;width:100%;height:100%;display:block}.caption-bar{text-align:center;justify-content:center;align-items:center;min-height:44px;padding:8px 16px;display:flex}.caption-bar p{color:#c7d0e6;max-width:720px;margin:0;font-size:15px;line-height:1.5}.quiz-step{box-sizing:border-box;color:#e8ecf4;background:#0b1220;border-radius:16px;flex-direction:column;justify-content:center;gap:20px;width:100%;height:100%;padding:32px;display:flex}.quiz-step h3{margin:0;font-size:22px;line-height:1.4}.quiz-options{flex-direction:column;gap:10px;display:flex}.quiz-option{text-align:left;color:#e8ecf4;cursor:pointer;background:#131b2e;border:1px solid #2e3f63;border-radius:10px;padding:14px 16px;font-size:15px;transition:border-color .15s,background .15s}.quiz-option:hover:not(:disabled){border-color:#6ea8fe}.quiz-option--selected{background:#1c2942;border-color:#6ea8fe}.quiz-option--correct{background:#16321f;border-color:#2b6b3f}.quiz-option--wrong{background:#341717;border-color:#7a2b2b}.quiz-submit,.quiz-continue{color:#05070d;cursor:pointer;background:#6ea8fe;border:none;border-radius:999px;align-self:flex-start;padding:10px 22px;font-weight:600}.quiz-submit:disabled{opacity:.5;cursor:not-allowed}.quiz-feedback p{color:#c7d0e6;margin:0 0 12px;line-height:1.6}.quiz-feedback--correct .quiz-continue{background:#6ef29a}.lesson-player{width:100%;max-width:1180px;box-shadow:var(--shadow);background:#0b1220;border-radius:20px;flex-direction:column;gap:14px;margin:0 auto;padding:24px;display:flex}.lesson-player-topbar{justify-content:space-between;align-items:flex-end;gap:20px;display:flex}.lesson-player-topbar-text{color:#93a4c3;flex-direction:column;gap:2px;font-size:13px;display:flex}.lesson-player-title{color:#e8ecf4;font-size:19px;font-weight:600}.lesson-player-topbar-controls{flex-shrink:0;align-items:center;gap:14px;display:flex}.lesson-pause-toggle{color:#e8ecf4;cursor:pointer;background:#1c2942;border:1px solid #2e3f63;border-radius:999px;padding:6px 14px;font-size:13px}.lesson-pause-toggle:hover{border-color:#6ea8fe}.lesson-player-time{color:#93a4c3;font-variant-numeric:tabular-nums;font-size:13px}.lesson-progress-track{background:#1c2942;border-radius:999px;height:4px;overflow:hidden}.lesson-progress-fill{background:#6ea8fe;border-radius:999px;height:100%;transition:width .2s linear}.lesson-player-main{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:20px;display:grid}.lesson-player-main--quiz{grid-template-columns:1fr}.lesson-player-stage{aspect-ratio:16/9;background:#0d1526;border-radius:16px;width:100%;position:relative;overflow:hidden}.lesson-player-side{flex-direction:column;gap:16px;display:flex}.lesson-video-panel{border-radius:14px;overflow:hidden}.lesson-outline{background:#10182b;border:1px solid #202b47;border-radius:14px;padding:14px 16px}.lesson-outline h4{text-transform:uppercase;letter-spacing:.06em;color:#6b7690;margin:0 0 10px;font-size:12px;font-weight:600}.lesson-outline ul{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.lesson-outline-item{color:#93a4c3;border-radius:8px;align-items:baseline;gap:10px;padding:7px 8px;font-size:13px;display:flex}.lesson-outline-item--active{color:#e8ecf4;background:#1c2942}.lesson-outline-time{font-variant-numeric:tabular-nums;color:#6b7690;flex-shrink:0;width:32px;font-size:11px}.lesson-outline-item--active 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