:root{--primary: #0f766e;--primary-dark: #115e59;--accent: #f59e0b;--bg: #f4f7f6;--card-bg: #ffffff;--border: #e2e8f0;--text: #1f2937;--muted: #6b7280;--danger: #dc2626;--success: #16a34a;--warning: #d97706;--info: #2563eb;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);direction:rtl}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit}.app-loading{height:100vh;display:flex;align-items:center;justify-content:center}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);padding:20px}.auth-card{background:var(--card-bg);border-radius:16px;padding:32px;max-width:440px;width:100%;box-shadow:0 20px 60px #00000040}.auth-logo{font-size:48px;text-align:center}.auth-title{text-align:center;font-size:20px;margin:8px 0 24px;color:var(--primary-dark)}.auth-tabs{display:flex;gap:8px;margin-bottom:16px}.tab{border:none;background:transparent;padding:8px 16px;border-radius:8px;color:var(--muted);font-weight:600;flex:1}.tab.active{background:var(--primary);color:#fff}.sub-tabs{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}.sub-tabs .tab{flex:none}.form{display:flex;flex-direction:column;gap:14px}.form label{display:flex;flex-direction:column;gap:4px;font-size:14px;font-weight:600;color:var(--text)}.form input,.form select,.form textarea{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px}.form-grid .full{grid-column:1 / -1}.form-inline{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}.form-inline input{padding:8px 10px;border:1px solid var(--border);border-radius:8px;flex:1;min-width:160px}.checkbox-row{flex-direction:row!important;align-items:center;gap:8px!important}.checkbox-row input{width:auto}.form-actions{display:flex;gap:10px;margin-top:4px}.hint{font-size:13px;color:var(--muted)}.btn{border:1px solid var(--border);background:#fff;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;color:var(--text)}.btn:hover{background:#f1f5f9}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-dark)}.btn-danger{background:#fff;color:var(--danger);border-color:var(--danger)}.btn-danger:hover{background:#fef2f2}.btn-success{background:#fff;color:var(--success);border-color:var(--success)}.btn-success:hover{background:#f0fdf4}.btn-small{padding:6px 12px;font-size:13px}.btn:disabled{opacity:.6;cursor:not-allowed}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600;background:#e2e8f0;color:#334155}.badge-success{background:#dcfce7;color:#166534}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-info{background:#dbeafe;color:#1e40af}.error-box{background:#fee2e2;color:#991b1b;padding:10px 14px;border-radius:8px;margin-bottom:10px;font-size:14px}.success-box{background:#dcfce7;color:#166534;padding:10px 14px;border-radius:8px;margin-bottom:10px;font-size:14px}.spinner{width:20px;height:20px;border:3px solid rgba(15,118,110,.2);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--primary-dark);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:12px 24px;flex-wrap:wrap;gap:12px}.app-header-title{display:flex;align-items:center;gap:8px;font-weight:700;font-size:16px}.app-header-nav{display:flex;gap:8px}.app-header-nav .tab{color:#fffc}.app-header-nav .tab.active{background:#fff3;color:#fff}.app-header-user{display:flex;align-items:center;gap:10px}.app-header-user .btn{background:transparent;color:#fff;border-color:#fff6}.app-header-user .btn:hover{background:#ffffff26}.app-main{flex:1;padding:24px;max-width:1100px;margin:0 auto;width:100%}.panel{background:var(--card-bg);border-radius:12px;padding:24px;box-shadow:0 1px 3px #00000014}.panel-sub{margin-top:24px;padding-top:16px;border-top:1px solid var(--border)}.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;flex-wrap:wrap;gap:10px}.toolbar label{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600}.toolbar select{padding:6px 10px;border-radius:8px;border:1px solid var(--border)}.meta-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:6px 0}.muted{color:var(--muted);font-size:13px}.description{color:var(--text);line-height:1.7}.lecture-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.lecture-card{background:#fafafa;border:1px solid var(--border);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}.lecture-card-body{padding:14px;cursor:pointer;flex:1}.lecture-card-body h3{margin:0 0 6px;font-size:16px}.lecture-card-actions{display:flex;gap:6px;padding:10px 14px;border-top:1px solid var(--border);flex-wrap:wrap}.lecture-card-with-extra{display:flex;flex-direction:column;gap:6px}.video-wrap{position:relative;padding-top:56.25%;margin:16px 0;border-radius:10px;overflow:hidden;background:#000}.video-wrap iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.extra-links{padding-inline-start:20px}.quiz-box{margin-top:20px;padding-top:16px;border-top:1px dashed var(--border)}.question-card{background:#f8fafc;border:1px solid var(--border);border-radius:10px;padding:14px;margin:10px 0}.options-list{display:flex;flex-direction:column;gap:6px;margin-top:8px}.option-row{display:flex;align-items:center;gap:8px;font-size:14px}.option-row.correct-answer{color:var(--success);font-weight:700}.quiz-result{padding:16px;border-radius:10px;margin-top:16px;text-align:center}.quiz-result.pass{background:#dcfce7;color:#166534}.quiz-result.fail{background:#fee2e2;color:#991b1b}.links-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.link-row{display:flex;gap:8px;margin-bottom:6px}.link-row input{flex:1;padding:8px 10px;border:1px solid var(--border);border-radius:8px}.feedback-item{padding:10px 0;border-bottom:1px solid var(--border)}.data-table{width:100%;border-collapse:collapse;font-size:14px}.data-table th,.data-table td{padding:10px;border-bottom:1px solid var(--border);text-align:right}.simple-list{padding-inline-start:20px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px}.stat-card{background:#f8fafc;border:1px solid var(--border);border-radius:10px;padding:16px;text-align:center}.stat-value{font-size:26px;font-weight:800;color:var(--primary-dark)}.stat-label{font-size:13px;color:var(--muted);margin-top:4px}@media (max-width: 640px){.form-grid{grid-template-columns:1fr}.app-header{flex-direction:column;align-items:flex-start}}