:root{--udemy-dark:#1c1d1f;--udemy-darker:#161617;--udemy-white:#fff;--udemy-gray-100:#f7f9fa;--udemy-gray-200:#d1d7dc;--udemy-gray-300:#6a6f73;--udemy-gray-400:#3e4143;--udemy-purple:#a435f0;--udemy-purple-hover:#8710d8;--udemy-green:#1e6055;--udemy-red:#b32d0e;--font-sans:"Segoe UI",system-ui,-apple-system,sans-serif;--max-width:1340px;--header-height:72px}*,:after,:before{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.5;color:var(--udemy-dark);background:var(--udemy-white)}.main-content{min-height:calc(100vh - var(--header-height) - 280px)}a{color:var(--udemy-purple);text-decoration:none}a:hover{color:var(--udemy-purple-hover);text-decoration:underline}button{font-family:inherit;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;font-size:16px;font-weight:700;border:none;border-radius:0;transition:background 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6px}.panel-form-title{margin:0 0 8px;font-size:1.75rem}.panel-form-intro{margin:0 0 32px;color:var(--udemy-gray-400);font-size:15px}.lesson-form .form-error-block{background:#fef2f2;color:var(--udemy-red);padding:12px 16px;margin-bottom:24px;border-radius:4px;border:1px solid #fecaca}.lesson-form .form-section{background:var(--udemy-white);border:1px solid var(--udemy-gray-200);border-radius:6px;padding:24px;margin-bottom:24px}.lesson-form .form-section-title{margin:0 0 20px;font-size:1.1rem;font-weight:700;color:var(--udemy-dark);padding-bottom:12px;border-bottom:1px solid var(--udemy-gray-200)}.lesson-form .form-section-fields{display:flex;flex-direction:column;gap:20px}.lesson-form .form-section-fields--grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:20px;gap:20px}@media (max-width:600px){.lesson-form .form-section-fields--grid{grid-template-columns:1fr}}.lesson-form .form-label{display:block;margin-bottom:0}.lesson-form 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.form-upload-zone--thumb{min-height:100px}.lesson-form .form-upload-zone-text{color:var(--udemy-gray-400);font-size:15px}.lesson-form .form-thumbnail-wrap{margin-top:8px;display:flex;align-items:flex-start;gap:16px;flex-wrap:wrap}.lesson-form .form-thumbnail-preview{width:200px;aspect-ratio:16/9;background:var(--udemy-gray-200);border-radius:6px;overflow:hidden}.lesson-form .form-thumbnail-preview img{width:100%;height:100%;object-fit:cover}.lesson-form .form-thumbnail-actions{display:flex;gap:8px;align-items:center}.lesson-form .form-thumbnail-actions label{margin:0;cursor:pointer}.admin-form .form-file-hidden{position:absolute;width:.1px;height:.1px;opacity:0;overflow:hidden;z-index:-1}.admin-form .form-upload-zone--thumb{min-height:100px;display:flex;align-items:center;justify-content:center;border:2px dashed var(--udemy-gray-300);border-radius:8px;background:var(--udemy-gray-100);cursor:pointer;margin-top:8px}.admin-form .form-upload-zone--thumb:hover{border-color:var(--udemy-gray-400);background:var(--udemy-gray-200)}.admin-form .form-upload-zone--thumb.form-upload-zone--loading{pointer-events:none;opacity:.8}.admin-form .form-upload-zone-text{color:var(--udemy-gray-400);font-size:15px}.admin-form .form-thumbnail-wrap{margin-top:8px;display:flex;align-items:flex-start;gap:16px;flex-wrap:wrap}.admin-form .form-thumbnail-preview{width:200px;aspect-ratio:16/9;background:var(--udemy-gray-200);border-radius:6px;overflow:hidden}.admin-form .form-thumbnail-preview img{width:100%;height:100%;object-fit:cover}.admin-form .form-thumbnail-actions{display:flex;gap:8px;align-items:center}.admin-form .form-thumbnail-actions label{margin:0;cursor:pointer}.lesson-form .form-slides-list{list-style:none;padding:0;margin:20px 0 0;display:flex;flex-direction:column;gap:16px}.lesson-form .form-slide-item{display:grid;grid-template-columns:160px 1fr auto;grid-gap:16px;gap:16px;align-items:start;padding:16px;background:var(--udemy-gray-100);border-radius:8px;border:1px solid var(--udemy-gray-200)}@media (max-width:520px){.lesson-form .form-slide-item{grid-template-columns:1fr}}.lesson-form .form-slide-preview{width:160px;aspect-ratio:16/10;background:var(--udemy-gray-200);border-radius:4px;overflow:hidden}.lesson-form .form-slide-preview img{width:100%;height:100%;object-fit:cover}.lesson-form .form-slide-caption{margin:0}.lesson-form .form-slide-actions{display:flex;flex-direction:column;gap:6px;align-items:flex-end}.lesson-form .form-btn-icon{width:36px;height:36px;padding:0;border:1px solid var(--udemy-gray-300);background:var(--udemy-white);border-radius:4px;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center}.lesson-form .form-btn-icon:hover:not(:disabled){background:var(--udemy-gray-100)}.lesson-form .form-btn-icon:disabled{opacity:.5;cursor:not-allowed}.lesson-form .form-btn-remove{padding:6px 12px;font-size:13px;border:1px solid var(--udemy-red);background:var(--udemy-white);color:var(--udemy-red);border-radius:4px;cursor:pointer}.lesson-form .form-btn-remove:hover{background:#fef2f2}.lesson-form .form-switches{display:flex;flex-direction:column;gap:16px}.lesson-form .form-switch{display:flex;align-items:center;gap:12px;cursor:pointer;margin:0}.lesson-form .form-switch input{width:20px;height:20px;cursor:pointer;flex-shrink:0}.lesson-form .form-switch-label{font-size:15px;color:var(--udemy-dark)}.lesson-form .form-actions{display:flex;flex-wrap:wrap;gap:12px;padding-top:8px;margin-bottom:32px}