:root{--bg:#0d1117;--panel:#161b22;--panel2:#1c2330;--border:#2d333b;--text:#e6edf3;--muted:#8b949e;--faint:#6e7681;--accent:#2f81f7;--green:#3fb950;--amber:#d29922;--purple:#bc8cff;--red:#ff6b5e;--head:"Tajawal", sans-serif;--body:"Cairo", sans-serif;--mono:"JetBrains Mono", monospace;--sb:340px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);font-family:var(--body);scrollbar-color:var(--border) var(--bg);scrollbar-width:thin;background-image:radial-gradient(circle at 12% 6%,#2f81f712,#0000 40%),radial-gradient(circle at 88% 96%,#bc8cff0d,#0000 42%);overflow:hidden}body::-webkit-scrollbar{width:12px;height:12px}.nav::-webkit-scrollbar{width:12px;height:12px}.home-scroll::-webkit-scrollbar{width:12px;height:12px}body::-webkit-scrollbar-track{background:#0b1016}.nav::-webkit-scrollbar-track{background:#0b1016}.home-scroll::-webkit-scrollbar-track{background:#0b1016}body::-webkit-scrollbar-thumb{background:linear-gradient(#2d333b,#1c2330);border:2px solid #0b1016;border-radius:999px}.nav::-webkit-scrollbar-thumb{background:linear-gradient(#2d333b,#1c2330);border:2px solid #0b1016;border-radius:999px}.home-scroll::-webkit-scrollbar-thumb{background:linear-gradient(#2d333b,#1c2330);border:2px solid #0b1016;border-radius:999px}body::-webkit-scrollbar-thumb:hover{background:linear-gradient(#3b4552,#27303d)}.nav::-webkit-scrollbar-thumb:hover{background:linear-gradient(#3b4552,#27303d)}.home-scroll::-webkit-scrollbar-thumb:hover{background:linear-gradient(#3b4552,#27303d)}body::-webkit-scrollbar-corner{background:#0b1016}.nav::-webkit-scrollbar-corner{background:#0b1016}.home-scroll::-webkit-scrollbar-corner{background:#0b1016}a{color:inherit;text-decoration:none}button{font-family:inherit}.app{width:100vw;height:100vh;display:flex}.sidebar{width:var(--sb);border-left:1px solid var(--border);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:40;background:#0d1117f2;flex-direction:column;flex-shrink:0;height:100vh;transition:transform .28s cubic-bezier(.4,0,.2,1);display:flex}.sb-head{border-bottom:1px solid var(--border);flex-direction:column;gap:12px;padding:18px 18px 12px;display:flex}.brand{align-items:center;gap:12px;display:flex}.brand .logo{background:linear-gradient(135deg, var(--accent), var(--purple));border-radius:11px;flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;display:flex}.brand .logo svg{color:#fff;width:21px;height:21px}.brand .bt{font-family:var(--head);font-size:16px;font-weight:800;line-height:1.25}.brand .bs{font-family:var(--mono);color:var(--faint);margin-top:2px;font-size:11px}.progress-wrap{margin-top:2px}.progress-meta{font-family:var(--mono);color:var(--muted);justify-content:space-between;margin-bottom:6px;font-size:11px;display:flex}.progress-meta b{color:var(--green)}.ptrack{background:var(--panel2);border:1px solid var(--border);border-radius:20px;height:6px;overflow:hidden}.pfill{background:linear-gradient(90deg, var(--accent), var(--purple));border-radius:20px;height:100%;transition:width .4s}.searchbox input{background:var(--panel2);border:1px solid var(--border);width:100%;color:var(--text);font-family:var(--body);border-radius:10px;outline:none;padding:10px 12px;font-size:13.5px;transition:all .2s}.searchbox input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #2f81f726}.searchbox input::placeholder{color:var(--faint)}.mode-toggle{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:10px 12px}.mode-label{font-family:var(--mono);color:var(--faint);margin-bottom:8px;font-size:10px}.mode-btns{gap:6px;display:flex}.mode-btn{border:1px solid var(--border);background:var(--panel2);color:var(--muted);cursor:pointer;border-radius:8px;flex:1;padding:8px 6px;font-size:12px;font-weight:600;transition:all .18s}.mode-btn:hover{color:var(--text);border-color:var(--faint)}.mode-btn.active{border-color:var(--accent);color:var(--text);background:#2f81f72e}.mode-btn.active.admin{border-color:var(--purple);background:#bc8cff29}.mode-hint{color:var(--faint);margin-top:8px;font-size:11px;line-height:1.4}.mode-lock{border:1px dashed var(--border);width:100%;color:var(--muted);cursor:pointer;background:0 0;border-radius:8px;margin-top:8px;padding:6px;font-size:11px}.mode-lock:hover{color:var(--red);border-color:var(--red)}.pin-form{flex-direction:column;gap:6px;margin-top:10px;display:flex}.pin-form label{color:var(--muted);font-size:11px}.pin-form input{background:var(--panel2);border:1px solid var(--border);color:var(--text);border-radius:8px;outline:none;padding:8px 10px;font-size:13px}.pin-form input:focus{border-color:var(--purple)}.pin-error{color:var(--red);font-size:11px}.pin-actions{gap:6px;display:flex}.pin-ok,.pin-cancel{cursor:pointer;border:1px solid var(--border);border-radius:8px;flex:1;padding:7px;font-size:12px}.pin-ok{background:var(--purple);color:#0d1117;border-color:#0000;font-weight:700}.pin-cancel{color:var(--muted);background:0 0}.nav{flex:1;padding:10px 12px 20px;overflow-y:auto}.mod{margin-top:4px}.mod-head{cursor:pointer;width:100%;color:var(--text);font-family:var(--head);text-align:right;background:0 0;border:none;border-radius:10px;align-items:center;gap:10px;padding:11px 12px;font-size:13.5px;font-weight:700;transition:all .18s;display:flex}.mod-head:hover{background:var(--panel)}.midx{background:var(--panel2);border:1px solid var(--border);width:28px;height:24px;font-family:var(--mono);color:var(--accent);border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;font-size:10px;display:flex}.mname{flex-wrap:wrap;flex:1;align-items:center;gap:6px;line-height:1.3;display:flex}.admin-badge{font-family:var(--mono);color:var(--purple);background:#bc8cff1f;border:1px solid #bc8cff4d;border-radius:99px;padding:1px 7px;font-size:9px;font-weight:700}.chev{width:16px;height:16px;color:var(--faint);flex-shrink:0;transition:transform .25s}.mod.collapsed .chev{transform:rotate(90deg)}.mod.collapsed .lessons{display:none}.mod-count{font-family:var(--mono);color:var(--faint);background:var(--panel2);border-radius:20px;padding:1px 7px;font-size:10px}.lessons{border-right:1px solid var(--border);margin-right:11px;padding:4px 0 8px}.litem{width:100%;color:var(--muted);border-radius:8px;align-items:flex-start;gap:9px;padding:8px 12px;font-size:13px;line-height:1.45;transition:all .16s;display:flex;position:relative}.litem:hover{background:var(--panel);color:var(--text)}.litem .lnum{font-family:var(--mono);color:var(--faint);flex-shrink:0;min-width:36px;font-size:11px}.litem .ltxt{flex:1}.litem .dot{border:1.5px solid var(--faint);border-radius:50%;flex-shrink:0;width:7px;height:7px;margin-top:5px}.litem.done .dot{background:var(--green);border-color:var(--green)}.litem.active{color:var(--text);background:linear-gradient(-90deg,#2f81f729,#0000);font-weight:600}.litem.active .lnum{color:var(--accent)}.litem.active:before{content:"";background:var(--accent);border-radius:3px;width:3px;position:absolute;top:6px;bottom:6px;right:0}.nav-empty{color:var(--faint);text-align:center;padding:20px;font-size:13px}.sb-foot{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:8px;padding:12px 16px;display:flex}.flat-meta{font-family:var(--mono);color:var(--faint);font-size:11px}.reset-btn{font-family:var(--mono);color:var(--faint);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:8px;padding:5px 10px;font-size:11px}.reset-btn:hover{color:var(--red);border-color:var(--red)}.overlay{z-index:30;opacity:0;pointer-events:none;background:#00000080;transition:all .25s;position:fixed;inset:0}.overlay.show{opacity:1;pointer-events:auto}.main{flex-direction:column;flex:1;min-width:0;height:100vh;display:flex}.topbar{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:20;background:#0d1117d9;flex-shrink:0;align-items:center;gap:12px;padding:12px 18px;display:flex}.iconbtn{background:var(--panel);border:1px solid var(--border);width:38px;height:38px;color:var(--text);cursor:pointer;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;transition:all .18s;display:flex}.iconbtn:hover{border-color:var(--accent);color:var(--accent)}.iconbtn svg{width:18px;height:18px}.iconbtn:disabled{opacity:.35;cursor:not-allowed}.iconbtn:disabled:hover{border-color:var(--border);color:var(--text)}.menu-btn{display:none}.cur-info{flex:1;min-width:0}.cur-crumb{font-family:var(--mono);color:var(--faint);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.cur-title{font-family:var(--head);white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:700;overflow:hidden}.nav-btns{gap:8px;display:flex}.page-lesson,.page-home{flex-direction:column;height:100%;min-height:0;display:flex}.frame-wrap{background:var(--bg);flex:1;min-height:0;position:relative}.lesson-frame{background:var(--bg);border:none;width:100%;height:100%;display:block}.viewer-state{height:100%;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:12px;display:flex}.viewer-state.error{color:var(--red)}.viewer-state a{color:var(--accent);text-decoration:underline}.spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:28px;height:28px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.home-scroll{flex:1;padding:0 24px 80px;overflow-y:auto}.hero{text-align:center;max-width:860px;margin:0 auto;padding:48px 0 32px}.course-badge{font-family:var(--mono);color:var(--green);background:#22c55e14;border:1px solid #22c55e40;border-radius:99px;align-items:center;gap:8px;margin-bottom:22px;padding:5px 16px;font-size:12px;font-weight:700;display:inline-flex}.hero h1{font-family:var(--head);font-size:clamp(28px,5vw,48px);font-weight:800;line-height:1.15}.hero .t1{color:var(--text);display:block}.hero .t2{background:linear-gradient(100deg, var(--accent), var(--purple));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;display:block}.meta-row{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:22px;display:flex}.meta-pill{font-family:var(--mono);border:1px solid var(--border);color:var(--muted);background:var(--panel);border-radius:99px;padding:5px 13px;font-size:11px}.ov-grid{grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:8px;max-width:860px;margin:0 auto 40px;display:grid}.ov-cell{background:var(--panel);border:1px solid var(--border);text-align:center;border-radius:10px;padding:14px 8px;transition:border-color .2s,transform .15s}.ov-cell:hover{border-color:var(--accent);transform:translateY(-2px)}.ov-cell.done{border-color:var(--green);background:#3fb9500f}.ov-num{font-family:var(--mono);font-size:18px;font-weight:700}.ov-lbl{color:var(--faint);margin-top:4px;font-size:11px;line-height:1.35}.ov-prog{font-family:var(--mono);color:var(--muted);margin-top:6px;font-size:10px}.home-sections{flex-direction:column;gap:12px;max-width:860px;margin:0 auto;display:flex}.home-sec{border:1px solid var(--border);background:var(--panel);border-radius:14px;overflow:hidden}.home-sec-head{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:16px 18px;display:flex}.home-sec-head h2{font-family:var(--head);font-size:16px;font-weight:700}.home-sec-head p{color:var(--faint);font-size:12px}.home-lessons{list-style:none}.home-lessons a{border-top:1px solid var(--border);color:var(--muted);align-items:center;gap:10px;padding:12px 18px;font-size:14px;transition:all .15s;display:flex}.home-lessons li:first-child a{border-top:none}.home-lessons a:hover{background:var(--panel2);color:var(--text)}.home-lessons a.done{color:var(--muted)}.home-lessons a.done .dot{background:var(--green);border-color:var(--green)}.home-lessons .dot{border:1.5px solid var(--faint);border-radius:50%;flex-shrink:0;width:7px;height:7px}.home-lessons .lnum{font-family:var(--mono);color:var(--faint);min-width:40px;font-size:11px}@media (width<=1200px){:root{--sb:min(340px, 82vw)}.sidebar{position:fixed;top:0;right:0;transform:translate(100%);box-shadow:0 0 40px #00000080}.sidebar.open{transform:translate(0)}.menu-btn{display:flex}}@media (width<=880px){.topbar{padding:10px 14px}.nav-btns{gap:6px}}