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0;border:none;border-radius:4px;align-items:center;padding:4px;display:flex}.sidebar-close:hover{color:#222;background:#f3f4f6}.sidebar-progress{border-bottom:1px solid #e5e7eb;flex-shrink:0;padding:16px 20px}.sidebar-progress-text{color:#666;justify-content:space-between;margin-bottom:8px;font-size:13px;font-weight:500;display:flex}.sidebar-progress-bar{background:#e5e7eb;border-radius:3px;height:6px;overflow:hidden}.sidebar-progress-fill{background:#2563eb;border-radius:3px;height:100%;transition:width .3s}.sidebar-sections{overscroll-behavior:contain;flex:1;overflow-y:auto}.sidebar-section{border-bottom:1px solid #f3f4f6}.sidebar-section-header{cursor:pointer;text-align:left;background:#f9fafb;border:none;justify-content:space-between;align-items:center;width:100%;padding:14px 20px;transition:background .15s;display:flex}.sidebar-section-header:hover{background:#f3f4f6}.sidebar-section-left{align-items:center;gap:8px;display:flex}.sidebar-chevron{color:#9ca3af;flex-shrink:0;transition:transform .2s}.sidebar-chevron.expanded{transform:rotate(90deg)}.sidebar-section-name{color:#222;font-size:14px;font-weight:600}.sidebar-section-count{color:#9ca3af;font-size:12px;font-weight:500}.sidebar-lessons{padding:4px 0}.sidebar-lesson{align-items:center;gap:10px;padding:8px 20px 8px 28px;transition:background .15s;display:flex}.sidebar-lesson:hover{background:#f9fafb}.sidebar-lesson.active{background:#eff6ff}.sidebar-lesson.active .sidebar-lesson-link{color:#2563eb;font-weight:500}.sidebar-lesson.completed .sidebar-lesson-link{color:#9ca3af}.sidebar-lesson-check{cursor:pointer;background:0 0;border:none;flex-shrink:0;align-items:center;padding:0;display:flex}.sidebar-lesson-link{cursor:pointer;text-align:left;color:#374151;background:0 0;border:none;flex:1;padding:0;font-size:14px;line-height:1.4}.sidebar-lesson-link:hover{color:#2563eb}.sidebar-cert-section{align-items:center;gap:12px;padding:16px 20px;display:flex}.sidebar-cert-section.locked{opacity:.5}.sidebar-cert-icon{flex-shrink:0}.sidebar-cert-text{flex-direction:column;flex:1;gap:2px;display:flex}.sidebar-cert-title{color:#222;font-size:14px;font-weight:600}.sidebar-cert-desc{color:#888;font-size:12px}.sidebar-cert-btn{color:#fff;cursor:pointer;background:#22c55e;border:none;border-radius:6px;flex-shrink:0;padding:6px 14px;font-size:13px;font-weight:600}.sidebar-cert-btn:hover{background:#16a34a}@media (max-width:768px){.course-main{margin-left:0!important}.course-sidebar.open{box-shadow:none;width:100%!important}.sidebar-drag-handle{display:none}}@media (max-width:640px){.course-sidebar.open{width:100%!important}}.cert-overlay{z-index:300;background:#0009;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.cert-modal{width:100%;max-width:620px}.cert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 20px 60px #0000004d}.cert-border{text-align:center;border:3px solid #2563eb;border-radius:8px;margin:16px;padding:40px 32px}.cert-accent-top,.cert-accent-bottom{background:linear-gradient(90deg,#0000,#2563eb,#0000);width:60%;height:3px;margin:24px auto}.cert-heading{letter-spacing:4px;color:#2563eb;margin-bottom:16px;font-size:13px;font-weight:600}.cert-course-name{color:#222;margin-bottom:8px;font-size:32px;font-weight:600}.cert-subtitle{color:#666;margin-bottom:24px;font-size:16px}.cert-congrats{color:#555;max-width:440px;margin:0 auto;font-size:15px;line-height:1.6}.cert-brand{color:#2563eb;margin-top:8px;font-size:13px;font-weight:600}.cert-actions{gap:12px;margin-top:16px;display:flex}.cert-download-btn{color:#fff;cursor:pointer;background:#2563eb;border:none;border-radius:8px;flex:1;padding:12px 24px;font-size:15px;font-weight:600;transition:background .15s}.cert-download-btn:hover{background:#1d4ed8}.cert-close-btn{color:#666;cursor:pointer;background:#fff;border:1px solid #e5e7eb;border-radius:8px;padding:12px 24px;font-size:15px;font-weight:500}.cert-close-btn:hover{background:#f9fafb}.dot{border-radius:50%;width:12px;height:12px}.dot.red{background:#ff5f57}.dot.yellow{background:#febc2e}.dot.green{background:#28c840}.code-editor-modal-overlay{z-index:1000;background:#000000b3;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.code-editor-modal{background:#fff;border-radius:12px;flex-direction:column;width:100%;max-width:900px;max-height:85vh;display:flex;box-shadow:0 20px 60px #0000004d}.modal-header{background:#f3f4f6;border-bottom:1px solid #e5e7eb;border-radius:12px 12px 0 0;justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.modal-title{align-items:center;gap:8px;display:flex}.modal-title span{color:#6b7280;margin-left:8px;font-family:SF Mono,monospace;font-size:13px}.modal-close{color:#6b7280;cursor:pointer;background:0 0;border:none;border-radius:4px;padding:6px}.modal-close:hover{color:#111;background:#e5e7eb}.modal-editor-container{flex:1;display:flex;overflow:hidden}.modal-editor{flex-direction:column;flex:1;display:flex}.modal-editor textarea{color:#374151;resize:none;background:#fff;border:none;outline:none;flex:1;width:100%;padding:16px;font-family:SF Mono,Fira Code,monospace;font-size:14px;line-height:1.6}.modal-editor textarea::placeholder{color:#9ca3af}.modal-output-container{background:#fafafa;border-left:1px solid #eee;flex-direction:column;width:320px;display:flex}.modal-output-header{color:#666;border-bottom:1px solid #eee;justify-content:space-between;align-items:center;padding:12px 14px;font-size:13px;font-weight:600;display:flex}.output-status{border-radius:4px;padding:3px 8px;font-size:11px;font-weight:500}.output-status.success{color:#fff;background:#22c55e}.output-status.error{color:#fff;background:#ef4444}.modal-output{color:#666;white-space:pre-wrap;border:2px solid #0000;flex:1;padding:14px;font-family:SF Mono,monospace;font-size:13px;line-height:1.5;overflow-y:auto}.modal-output.success{border-color:#22c55e}.modal-output.error{border-color:#ef4444}.modal-footer{background:#fff;border-top:1px solid #eee;border-radius:0 0 12px 12px;justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.modal-footer-right{align-items:center;gap:12px;display:flex}.success-text{color:#22c55e;align-items:center;gap:6px;font-size:13px;font-weight:500;display:flex}.btn{cursor:pointer;border:none;border-radius:6px;align-items:center;gap:6px;padding:10px 18px;font-size:14px;font-weight:500;text-decoration:none;transition:all .15s;display:inline-flex}.btn-primary{color:#fff;background:#2563eb}.btn-primary:hover{background:#1d4ed8}.btn-secondary{color:#444;background:#f5f5f5;border:1px solid #ddd}.btn-secondary:hover{background:#eee}.btn-success{color:#fff;background:#22c55e}.btn-success:hover{background:#16a34a}.btn:disabled{opacity:.5;cursor:not-allowed}table{border-collapse:collapse;background:#fff;border:1px solid #e5e7eb;border-radius:8px;width:100%;margin:20px 0;overflow:hidden}th,td{text-align:center;padding:12px 16px}th{color:#222;background:#f9fafb;font-size:13px;font-weight:600}td{border-top:1px solid #e5e7eb;font-family:SF Mono,monospace;font-size:14px}tr:hover td{background:#f9fafb}@media (max-width:640px){.btn{padding:8px 14px;font-size:13px}.modal-editor-container{flex-direction:column}.modal-output-container{border-top:1px solid #eee;border-left:none;width:100%;max-height:180px}.code-editor-modal{max-height:90vh;margin:12px}}.code-runner-inline{background:#fff;border:1px solid #e5e7eb;border-radius:10px;margin:20px 0;overflow:hidden}.code-editor-container{background:#1e1e2e;border-bottom:1px solid #313244;display:flex}.code-line-numbers{color:#6c7086;text-align:right;-webkit-user-select:none;user-select:none;background:#181825;min-width:45px;padding:16px 0;font-family:SF Mono,Fira Code,monospace;font-size:14px;line-height:1.6}.line-number{padding:0 12px}.code-editor{color:#cdd6f4;resize:none;background:#1e1e2e;border:none;outline:none;flex:1;min-height:120px;padding:16px;font-family:SF Mono,Fira Code,monospace;font-size:14px;line-height:1.6}.code-editor::placeholder{color:#6c7086}.code-actions{background:#f9fafb;border-bottom:1px solid #e5e7eb;align-items:center;gap:10px;padding:12px 16px;display:flex}.run-btn{color:#fff;cursor:pointer;background:#22c55e;border:none;border-radius:6px;align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;transition:background .15s;display:inline-flex}.run-btn:hover{background:#16a34a}.reset-btn{color:#6b7280;cursor:pointer;background:#fff;border:1px solid #d1d5db;border-radius:6px;padding:8px 14px;font-size:14px;font-weight:500;transition:all .15s}.reset-btn:hover{color:#374151;background:#f3f4f6}.code-output{background:#f9fafb}.code-output .output-label{color:#6b7280;text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid #e5e7eb;padding:10px 16px;font-size:12px;font-weight:600}.code-output pre{color:#22c55e;white-space:pre-wrap;background:0 0;border:none;margin:0;padding:16px;font-family:SF Mono,Fira Code,monospace;font-size:14px;line-height:1.6}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}