.lesson-hero{background:var(--bg-light);padding:32px 0 28px}.lesson-breadcrumb ol{display:flex;gap:8px;list-style:none;padding:0;margin:0 0 20px;font-size:13px;flex-wrap:wrap}.lesson-breadcrumb a{text-decoration:none}.lesson-breadcrumb a:hover{color:var(--primary)}.lesson-header-content{max-width:800px}.lesson-tutorial-label{display:inline-block;font-size:13px;font-weight:600;color:var(--primary);background:var(--bg-white);border:1px solid var(--border-light);padding:4px 12px;border-radius:6px;margin-bottom:12px}.lesson-title{font-size:28px;font-weight:700;color:var(--text-dark);margin:0 0 16px;line-height:1.35}.lesson-meta{display:flex;gap:16px;flex-wrap:wrap}.lesson-duration-badge,.lesson-progress-badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--text-light);background:var(--bg-white);border:1px solid var(--border-light);padding:5px 12px;border-radius:6px}.lesson-duration-badge i,.lesson-progress-badge 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8px 8px 0;margin:20px 0;font-size:14px;line-height:1.7}[dir="rtl"] .lesson-body .lesson-note{border-left:none;border-right:4px solid var(--primary);border-radius:8px 0 0 8px}.lesson-body .lesson-tip{background:#f0fdf4;border-left:4px solid #16a34a;padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0;font-size:14px;line-height:1.7}[dir="rtl"] .lesson-body .lesson-tip{border-left:none;border-right:4px solid #16a34a;border-radius:8px 0 0 8px}.lesson-body .lesson-warning{background:#fef2f2;border-left:4px solid #dc2626;padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0;font-size:14px;line-height:1.7}[dir="rtl"] .lesson-body .lesson-warning{border-left:none;border-right:4px solid #dc2626;border-radius:8px 0 0 8px}.lesson-body .lesson-exercise{border:2px dashed var(--primary-light);background:#fafbff;padding:20px 24px;border-radius:10px;margin:24px 0;font-size:14px;line-height:1.7}.lesson-body .lesson-exercise h4{margin:0 0 12px;color:var(--primary);font-weight:700}.lesson-body img{max-width:100%;height:auto;border-radius:8px;margin:20px 0}.lesson-body table{width:100%;border-collapse:collapse;margin:20px 0;font-size:14px}.lesson-body table th,.lesson-body table td{border:1px solid var(--border-light);padding:10px 14px;text-align:left}[dir="rtl"] .lesson-body table th,[dir="rtl"] .lesson-body table td{text-align:right}.lesson-body table th{background:var(--bg-light);font-weight:600}.lesson-body blockquote{border-left:4px solid var(--border-light);margin:20px 0;padding:12px 20px;color:var(--text-light);font-style:italic}[dir="rtl"] .lesson-body blockquote{border-left:none;border-right:4px solid var(--border-light)}.lesson-body hr{border:none;border-top:1px solid var(--border-light);margin:32px 0}.lesson-body strong{font-weight:600;color:var(--text-dark)}.lesson-body a{color:var(--primary);text-decoration:underline;text-decoration-color:var(--primary-light);text-underline-offset:2px}.lesson-body a:hover{color:var(--primary-light)}@media 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var(--border-light);border-radius:10px;text-decoration:none;transition:all 0.2s ease;height:100%}.lesson-nav-card:hover{border-color:var(--primary-light);box-shadow:0 4px 16px rgba(59,130,246,0.1)}.lesson-nav-card-next{text-align:right}[dir="rtl"] .lesson-nav-card-next{text-align:left}[dir="rtl"] .lesson-nav-card:not(.lesson-nav-card-next){text-align:right}.lesson-nav-label{font-size:12px;font-weight:600;color:var(--primary);text-transform:uppercase;letter-spacing:0.5px;display:flex;align-items:center;gap:6px}.lesson-nav-card-next .lesson-nav-label{justify-content:flex-end}[dir="rtl"] .lesson-nav-card:not(.lesson-nav-card-next) .lesson-nav-label{justify-content:flex-end}[dir="rtl"] .lesson-nav-card-next .lesson-nav-label{justify-content:flex-start}.lesson-nav-title{font-size:15px;font-weight:600;color:var(--text-dark);line-height:1.4;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.lesson-nav-card-back .lesson-nav-label{color:var(--text-light)}.lesson-back-link{text-align:center;max-width:800px;margin:0 auto}.lesson-back-link a{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:var(--primary);text-decoration:none;padding:8px 16px;border-radius:8px;transition:background 0.2s}.lesson-back-link a:hover{background:var(--bg-light)}@media (max-width:600px){.lesson-nav{flex-direction:column;gap:12px}.lesson-nav-card-next{text-align:left}.lesson-nav-card-next .lesson-nav-label{justify-content:flex-start}[dir="rtl"] .lesson-nav-card-next{text-align:right}[dir="rtl"] .lesson-nav-card-next .lesson-nav-label{justify-content:flex-end}}