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24px;display:flex;position:sticky;top:0}.teach-brand{align-items:center;gap:12px;display:flex}.teach-logo-badge{color:#fff;background:linear-gradient(135deg,#2563eb,#6366f1);border-radius:10px;justify-content:center;align-items:center;width:42px;height:42px;font-size:18px;font-weight:800;display:flex}.teach-brand-title{color:var(--teach-text);font-size:17px;font-weight:800;line-height:1.2}.teach-brand-subtitle{color:var(--teach-text-muted);font-size:12px}.teach-user-actions{align-items:center;gap:12px;display:flex}.teach-user-chip{background-color:var(--teach-card-bg);border:1px solid var(--teach-card-border);border-radius:9999px;align-items:center;gap:10px;padding:6px 14px;font-size:13px;display:flex}.teach-icon-btn{border:1px solid var(--teach-card-border);background-color:var(--teach-card-bg);width:38px;height:38px;color:var(--teach-text);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;transition:all .15s;display:flex}.teach-icon-btn:hover{background-color:var(--teach-table-hover)}.teach-logout-btn{color:#dc2626;cursor:pointer;background-color:#fef2f2;border:1px solid #fee2e2;border-radius:8px;align-items:center;gap:6px;padding:8px 14px;font-size:13px;font-weight:700;transition:all .15s;display:flex}.teach-logout-btn:hover{background-color:#fee2e2}.teach-main{flex-direction:column;gap:24px;width:100%;max-width:1280px;margin:0 auto;padding:24px;display:flex}.teach-live-banner{color:#fff;background:linear-gradient(135deg,#1e3a8a,#2563eb);border-radius:16px;justify-content:space-between;align-items:center;padding:22px 28px;animation:2.5s infinite pulse-border;display:flex;box-shadow:0 10px 25px -5px #2563eb66}@keyframes pulse-border{0%{box-shadow:0 0 #2563eb80}70%{box-shadow:0 0 0 10px #2563eb00}to{box-shadow:0 0 #2563eb00}}.teach-live-pulse-dot{background-color:#22c55e;border-radius:50%;width:12px;height:12px;animation:1.2s ease-in-out infinite live-blink;box-shadow:0 0 8px #22c55e}@keyframes live-blink{0%,to{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.85)}}.teach-resume-btn{color:#1e3a8a;cursor:pointer;background-color:#fff;border:none;border-radius:12px;align-items:center;gap:10px;padding:12px 22px;font-size:15px;font-weight:800;transition:transform .15s,box-shadow .15s;display:flex;box-shadow:0 4px 12px #00000026}.teach-resume-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px #0003}.teach-card{background-color:var(--teach-card-bg);border:1px solid var(--teach-card-border);border-radius:14px;padding:20px;box-shadow:0 1px 3px #0000000d}.teach-card-header{border-bottom:1px solid var(--teach-card-border);justify-content:space-between;align-items:center;margin-bottom:18px;padding-bottom:12px;display:flex}.teach-card-title{color:var(--teach-text);align-items:center;gap:8px;font-size:17px;font-weight:800;display:flex}.teach-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:18px;display:grid}.teach-course-card{background-color:var(--teach-card-bg);border:1px solid var(--teach-card-border);border-radius:12px;flex-direction:column;justify-content:space-between;gap:16px;padding:18px;transition:transform .15s,border-color .15s;display:flex}.teach-course-card:hover{border-color:#3b82f6;transform:translateY(-2px)}.presentation-view{color:#f8fafc;box-sizing:border-box;-webkit-user-select:none;user-select:none;background-color:#020617;flex-direction:column;justify-content:space-between;width:100vw;min-height:100vh;padding:28px 40px;font-family:Cairo,sans-serif;display:flex}.presentation-view.light{color:#0f172a;background-color:#f8fafc}.pres-top-bar{border-bottom:2px solid #ffffff1a;justify-content:space-between;align-items:center;padding-bottom:18px;display:flex}.presentation-view.light .pres-top-bar{border-bottom:2px solid #e2e8f0}.pres-course-badge{color:#bfdbfe;background-color:#1e3a8a;border-radius:8px;align-items:center;gap:8px;padding:6px 14px;font-size:15px;font-weight:700;display:inline-flex}.pres-course-title{letter-spacing:-.5px;margin-top:6px;font-size:32px;font-weight:900}.pres-center-stage{flex:1;justify-content:center;align-items:center;gap:60px;padding:20px 0;display:flex}.pres-qr-wrapper{background-color:#fff;border-radius:28px;flex-direction:column;align-items:center;gap:14px;padding:20px;display:flex;box-shadow:0 20px 50px #00000080}.pres-progress-bar-bg{background-color:#e2e8f0;border-radius:9999px;width:100%;height:8px;overflow:hidden}.pres-progress-bar-fill{background:linear-gradient(90deg,#2563eb,#3b82f6);border-radius:9999px;height:100%;transition:width .25s linear}.pres-stats-col{flex-direction:column;gap:24px;display:flex}.pres-count-display{flex-direction:column;gap:8px;display:flex}.pres-count-number{color:#38bdf8;text-shadow:0 4px 16px #38bdf84d;font-size:80px;font-weight:900;line-height:1}.presentation-view.light .pres-count-number{color:#0284c7}.pres-count-label{color:#94a3b8;font-size:22px;font-weight:700}.pres-timer-pill{direction:ltr;background-color:#ffffff14;border-radius:9999px;align-items:center;gap:10px;padding:10px 20px;font-family:JetBrains Mono,monospace;font-size:20px;font-weight:800;display:inline-flex}.presentation-view.light .pres-timer-pill{color:#0f172a;background-color:#e2e8f0}.pres-bottom-bar{border-top:2px solid #ffffff1a;justify-content:space-between;align-items:center;padding-top:18px;display:flex}.presentation-view.light .pres-bottom-bar{border-top:2px solid #e2e8f0}.pres-end-btn{color:#fff;cursor:pointer;background-color:#dc2626;border:none;border-radius:12px;align-items:center;gap:10px;padding:12px 26px;font-size:16px;font-weight:800;transition:transform .15s,background-color .15s;display:flex;box-shadow:0 4px 14px #dc262666}.pres-end-btn:hover{background-color:#b91c1c;transform:translateY(-2px)}.teach-modal-overlay{z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background-color:#0f172ab3;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.teach-modal-content{background-color:var(--teach-card-bg);border:1px solid var(--teach-card-border);border-radius:16px;width:100%;max-width:520px;padding:24px;animation:.2s cubic-bezier(.16,1,.3,1) modal-pop;box-shadow:0 20px 25px -5px #00000040}@keyframes modal-pop{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.teach-table{border-collapse:collapse;width:100%;font-size:13.5px}.teach-table th{background-color:var(--teach-table-header);color:var(--teach-text-muted);text-align:start;border-bottom:2px solid var(--teach-card-border);padding:10px 14px;font-weight:700}.teach-table td{border-bottom:1px solid var(--teach-card-border);color:var(--teach-text);vertical-align:middle;padding:12px 14px}.teach-table tr:hover td{background-color:var(--teach-table-hover)}