._header_1kdkn_1{background:#fff;border-bottom:3px solid var(--orange);padding:0 32px;display:flex;align-items:center;justify-content:space-between;height:68px;position:sticky;top:0;z-index:300;box-shadow:0 2px 12px #00000014}._logo_1kdkn_15{display:flex;align-items:center;gap:11px}._logoBadge_1kdkn_20{width:42px;height:42px;background:var(--navy);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}._logoName_1kdkn_31{font-family:Nunito,sans-serif;font-weight:900;font-size:15px;color:var(--navy);line-height:1.2}._logoSub_1kdkn_38{font-size:10px;color:var(--orange);font-weight:700;text-transform:uppercase;letter-spacing:.4px}._nav_1kdkn_46{display:flex;gap:3px}._navBtn_1kdkn_50{padding:8px 13px;border-radius:6px;color:var(--navy);font-weight:700;font-size:13px;font-family:Nunito,sans-serif;transition:all .15s;white-space:nowrap}._navBtn_1kdkn_50:hover,._navBtn_1kdkn_50._active_1kdkn_60{background:var(--navy);color:#fff}._userArea_1kdkn_65{display:flex;align-items:center;gap:10px}._avatar_1kdkn_70{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--navy),var(--navy-mid));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:13px;border:2px solid var(--orange);flex-shrink:0}._userName_1kdkn_84{color:var(--navy);font-size:13px;font-weight:700}._signOut_1kdkn_89{background:none;border:1px solid var(--gray-l);color:var(--gray);font-size:12px;padding:5px 10px;border-radius:6px;font-weight:600;transition:all .15s}._signOut_1kdkn_89:hover{border-color:var(--navy);color:var(--navy)}:root{--navy: #1A3C6E;--navy-dark: #122A52;--navy-mid: #2456A4;--orange: #E8720C;--orange-light: #F5A623;--white: #ffffff;--off: #F0F4F8;--off2: #F7F9FC;--gray: #6B7280;--gray-l: #E5E7EB;--gray-ll: #F3F4F6;--text: #1F2937;--green: #059669;--red: #DC2626}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Nunito Sans,sans-serif;background:var(--off);color:var(--text);min-height:100vh}h1,h2,h3,h4,h5{font-family:Nunito,sans-serif}button{cursor:pointer;font-family:inherit}input,textarea,select{font-family:inherit}a{text-decoration:none;color:inherit}.lesson-content h3{font-size:17px;font-weight:800;color:var(--navy);margin:20px 0 10px}.lesson-content h3:first-child{margin-top:0}.lesson-content p{margin-bottom:14px;line-height:1.75}.lesson-content ul,.lesson-content ol{margin:0 0 14px 20px}.lesson-content li{margin-bottom:6px;line-height:1.6}.lesson-content code{background:var(--off);padding:2px 7px;border-radius:4px;font-size:12px;font-family:monospace;color:var(--navy)}.lesson-content .callout-tip{background:#1a3c6e0f;border-left:4px solid var(--navy);padding:14px 18px;border-radius:0 8px 8px 0;margin:16px 0;font-size:14px}.lesson-content .callout-warning{background:#e8720c14;border-left:4px solid var(--orange);padding:14px 18px;border-radius:0 8px 8px 0;margin:16px 0;font-size:14px}.lesson-content .callout-warning strong{color:var(--orange)}.badge{display:inline-block;font-size:11px;font-weight:800;padding:4px 10px;border-radius:5px;white-space:nowrap;font-family:Nunito,sans-serif}.badge-orange{background:#e8720c1f;color:var(--orange)}.badge-navy{background:#1a3c6e1a;color:var(--navy)}.badge-green{background:#0596691a;color:var(--green)}.badge-gray{background:var(--gray-ll);color:var(--gray)}.progress-bar{background:var(--gray-l);border-radius:99px;height:8px;overflow:hidden}.progress-fill{height:100%;border-radius:99px;transition:width .5s}