@font-face{font-family:Tajawal;src:url('/fonts/Tajawal-Regular.ttf') format('truetype');font-weight:400;font-display:swap}@font-face{font-family:Tajawal;src:url('/fonts/Tajawal-Medium.ttf') format('truetype');font-weight:500;font-display:swap}@font-face{font-family:Tajawal;src:url('/fonts/Tajawal-Bold.ttf') format('truetype');font-weight:700;font-display:swap}
:root{--blue:#173bee;--navy:#071c37;--ink:#112542;--muted:#52647a;--line:#dce4ef;--pale:#edf3ff;--yellow:#eaf23a;--surface:#f6f8fc;--radius:16px}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#fff;font-family:Tajawal,Arial,sans-serif;font-size:17px;line-height:1.7}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #557cff;outline-offset:4px}h1,h2,h3,p{margin:0 0 16px}h1{font-size:clamp(2.2rem,4.4vw,4.1rem);line-height:1.28;letter-spacing:-.025em;font-weight:700;white-space:pre-line}html[dir=rtl] h1{letter-spacing:0;line-height:1.5}h2{font-size:1.8rem;line-height:1.4}h3{font-size:1.25rem;line-height:1.4}small,.small-text{font-size:.875rem}.muted{color:var(--muted)}.container{max-width:1280px;padding-inline:36px;margin-inline:auto}.announcement{background:var(--navy);color:#d6e5ff;font-size:.875rem;text-align:center;padding:8px 20px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner{display:flex;gap:30px;align-items:center;min-height:104px;flex-wrap:wrap}.brand{display:flex;gap:10px;align-items:center;color:var(--navy);font-weight:700;font-size:1.75rem;line-height:1.1;direction:ltr}.brand:hover{text-decoration:none}.brand small{display:block;font-size:.75rem;line-height:1.6;letter-spacing:.02em;font-weight:500;color:var(--muted)}.brand img{width:44px;height:58px;object-fit:contain}.brand-letter{font-size:3rem;position:relative;color:var(--blue);font-weight:700}.brand-letter span{color:#bcc500;position:absolute;top:-11px;right:-6px;font-size:1.5rem}.main-nav{display:flex;gap:26px;align-items:center;margin-inline:auto}.main-nav a{color:var(--ink);font-weight:500;padding-block:30px;border-bottom:3px solid transparent}.main-nav a.active{border-color:var(--blue);color:var(--blue)}.header-actions{display:flex;gap:16px;align-items:center}.header-actions form{margin:0}.language,.text-button{border:0;background:none;color:var(--blue);padding:6px 0}.cart-link{color:var(--ink);white-space:nowrap;font-size:.9rem}.cart-link span{display:inline-flex;justify-content:center;align-items:center;min-width:22px;height:22px;background:var(--pale);color:var(--blue);border-radius:50%;font-size:.75rem}.main-content{min-height:58vh;padding-top:38px;padding-bottom:80px}.hero{display:grid;grid-template-columns:1.12fr 1fr;gap:55px;align-items:center;padding:30px 0 55px}.eyebrow{color:var(--blue);font-size:.85rem;font-weight:700;letter-spacing:.08em;display:block;margin-bottom:16px}html[dir=rtl] .eyebrow{letter-spacing:0}.hero-copy h1{max-width:680px;margin-bottom:22px}.hero-copy p{font-size:1.125rem;max-width:580px;color:var(--muted);line-height:1.9}.actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--blue);background:var(--blue);color:white;border-radius:9px;padding:12px 23px;font-weight:700;font-size:1rem;min-height:47px;text-align:center;text-decoration:none;line-height:1.5}.button:hover{background:#102bcc;text-decoration:none}.button.small{padding:9px 15px;font-size:.9rem;min-height:40px}.button.outline{background:white;color:var(--blue);border-color:#bfd0f4}.button.outline:hover{background:var(--pale)}.button.white{background:white;color:var(--blue);border-color:white}.button.full{width:100%}.hero-meta{display:flex;flex-wrap:wrap;gap:24px;color:var(--muted);margin-top:28px;font-size:.9rem}.hero-meta span:before{content:'✓';color:var(--blue);margin-inline-end:8px}.hero-lab{background:var(--navy);border-radius:24px;color:white;padding:28px;min-height:415px;position:relative;overflow:hidden}.lab-top{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:#afc7e5}.tag{display:inline-block;background:var(--pale);color:var(--blue);padding:4px 12px;border-radius:5px;font-size:.8rem;font-weight:700}.tag.light{background:#183555;color:#c5defb}.packet-diagram{height:190px;display:flex;align-items:center;justify-content:center;direction:ltr}.network-node{border:1px solid #47709c;padding:14px 7px;min-width:72px;text-align:center;border-radius:8px;background:#0d294a;box-shadow:0 12px 0 #041326}.network-node span{font-size:1.7rem;color:#9bdfff}.network-node strong{display:block;font-size:.75rem;color:#bfd2e8}.network-node.router{background:#173bee;border-color:#5875ff;transform:translateY(-20px)}.connection{height:1px;flex:1;max-width:42px;background:#527ca8;position:relative}.connection i{width:7px;height:7px;border-radius:50%;background:var(--yellow);display:block;position:absolute;left:35%;top:-3px}.lab-card-copy{border-top:1px solid #29425f;padding-top:20px}.lab-card-copy h2{font-size:1.55rem}.lab-card-copy p{font-size:1rem;color:#adc3dc;line-height:1.7}.lab-card-copy a{color:var(--yellow);font-weight:700}.section{margin-top:45px}.section-heading{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:22px}.section-heading p{color:var(--muted);max-width:350px}.grid{display:grid;gap:22px}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.wide,.span-two{grid-column:1/-1}.feature-card{border:1px solid var(--line);border-radius:var(--radius);padding:30px;color:var(--ink);position:relative;transition:border-color .2s,transform .2s}.feature-card:hover{text-decoration:none;border-color:var(--blue);transform:translateY(-3px)}.feature-card .tag{margin:12px 0 22px}.feature-number{position:absolute;inset-inline-end:26px;top:23px;font-size:2.5rem;font-weight:700;color:#c8d6ee}.feature-card h3{font-size:1.65rem}.feature-card p{color:var(--muted);min-height:75px}.text-link{color:var(--blue);font-weight:700}.blue-band{background:var(--blue);color:white;border-radius:18px;padding:38px;display:flex;align-items:center;gap:40px;justify-content:space-between;margin-top:55px}.blue-band .eyebrow{color:var(--yellow)}.blue-band h2{font-size:1.8rem}.blue-band p{max-width:720px;color:#e2e9ff;margin:0}.blue-band .button{flex-shrink:0}footer{background:#f3f6fb;border-top:1px solid var(--line);padding:46px 0 18px;color:var(--muted);font-size:.9rem}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.3fr;gap:40px}.footer-grid strong{color:var(--ink);display:block;margin-bottom:12px}.footer-grid a,.footer-grid span{display:block;margin-block:7px;color:var(--muted)}.footer-grid .footer-brand{font-size:2rem;direction:ltr;text-align:start;display:flex;gap:8px;line-height:1.3}.footer-brand span{font-size:1rem;color:var(--blue);margin:0}.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;display:flex;justify-content:space-between}.page-heading{margin:14px 0 35px}.page-heading p{color:var(--muted);max-width:750px;font-size:1.1rem}.page-heading h1{font-size:clamp(2rem,3.3vw,3rem)}.filter-bar{display:flex;align-items:end;gap:18px;background:var(--surface);border:1px solid var(--line);padding:20px;border-radius:12px;margin:25px 0 30px}.filter-bar label{flex:1}.filter-bar .search-label{flex:2}label{display:flex;flex-direction:column;gap:6px;font-size:.95rem;font-weight:500}input,select,textarea{background:#fff;color:var(--ink);border:1px solid #bfcddd;border-radius:8px;padding:11px 13px;width:100%;min-width:0;font-size:1rem;line-height:1.5}textarea{resize:vertical;min-height:105px}input[type=checkbox]{width:19px;height:19px;flex-shrink:0;accent-color:var(--blue)}input[type=file]{font-size:.875rem}.check{flex-direction:row;align-items:center;gap:10px}.panel{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}.panel+.panel{margin-top:18px}.grid>.panel+.panel{margin-top:0}.catalog-card{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius)}.course-cover{background:#0d2850;color:#c1d9ff;height:160px;padding:23px;display:flex;align-items:start;justify-content:space-between;direction:ltr}.course-cover strong{font-size:4rem;color:#779cff}.course-cover span{font-size:.8rem;letter-spacing:.12em}.product-image{width:100%;height:220px;object-fit:contain;background:var(--surface)}.card-body{padding:25px}.card-body h2{font-size:1.45rem;margin-top:12px}.card-body p{color:var(--muted)}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:17px}.empty{border:1px dashed #bdcde3;background:var(--surface);padding:55px 30px;text-align:center;border-radius:var(--radius)}.empty p{color:var(--muted);max-width:620px;margin-inline:auto}.empty-mark{display:inline-flex;font-size:2.5rem;font-weight:700;align-items:center;justify-content:center;width:80px;height:80px;background:var(--pale);color:var(--blue);border-radius:20px;margin-bottom:20px}.split{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(300px,1fr);gap:36px;align-items:start}.split>section>h1{font-size:2.6rem;margin-block:20px}.sticky{position:sticky;top:20px}.lead{font-size:1.15rem;color:var(--muted)}.preserve{white-space:pre-line;overflow-wrap:anywhere}.breadcrumb{display:inline-block;margin-bottom:20px;font-size:.95rem}.lesson-row,.record-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-bottom:1px solid var(--line);color:var(--ink)}.lesson-row strong{flex:1}.lesson-row>span{color:var(--blue);font-weight:700}.lesson-row.selected{background:var(--pale)}.record-row p{margin:4px 0 0}.record-row:last-child{border:0}.video-player{width:100%;aspect-ratio:16/9;background:var(--navy);border:0;border-radius:12px}.lesson-body{margin:25px 0}.stack{display:grid;gap:18px}.stack small{color:var(--muted)}.auth-shell{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:22px;overflow:hidden;max-width:1040px;margin:20px auto}.auth-story{background:var(--navy);color:#fff;padding:48px;position:relative;overflow:hidden}.auth-story .eyebrow{color:var(--yellow)}.auth-story h1{font-size:2.7rem}.auth-story p{color:#b7cbe4}.auth-pattern{font-weight:700;font-size:13rem;color:#17375d;line-height:1.5;text-align:center;user-select:none;direction:ltr}.auth-form{padding:45px}.auth-form h2{margin-bottom:30px}.divider{text-align:center;border-top:1px solid var(--line);margin:30px 0 18px;padding-top:12px;color:var(--muted)}.button.google{color:var(--ink);background:white;border-color:var(--line)}.auth-form>p{margin-top:20px}.between{display:flex;justify-content:space-between;align-items:center;gap:18px}.notice{padding:18px 22px;background:var(--pale);border-inline-start:4px solid var(--blue);border-radius:8px;margin:15px 0 25px;color:var(--ink)}.notice.success{border-color:#14785a;background:#eaf8f1}.notice.error{border-color:#b83249;background:#fff0f2}.notice ul{margin-bottom:0}.payment-account{font-size:1.3rem;background:var(--surface);padding:20px;border-radius:8px;overflow-wrap:anywhere}.reference{font-size:.875rem;font-family:monospace;overflow-wrap:anywhere}.steps>div{border-bottom:1px solid var(--line);padding:22px 0}.steps span{color:var(--blue);font-size:1.7rem;font-weight:700}.steps h3{margin-top:10px}.steps p{color:var(--muted)}.narrow{max-width:900px;margin:auto}.price{font-size:2rem;color:var(--blue)}hr{border:0;border-top:1px solid var(--line);margin:25px 0}progress{height:10px;border:0;border-radius:8px;overflow:hidden;width:100%;accent-color:var(--blue)}progress::-webkit-progress-bar{background:var(--pale)}progress::-webkit-progress-value{background:var(--blue)}.admin-shell{display:grid;grid-template-columns:230px minmax(0,1fr);gap:35px}.admin-nav{background:var(--surface);padding:24px 18px;border:1px solid var(--line);border-radius:14px;align-self:start}.admin-nav h2{font-size:1.4rem}.admin-nav .eyebrow{font-size:.7rem}.admin-nav a{display:block;padding:10px 13px;color:var(--muted);border-radius:6px;font-size:.94rem}.admin-nav a.active{background:var(--blue);color:white}.admin-content h1{font-size:2.3rem}.stat span{font-size:.9rem;color:var(--muted)}.stat strong{display:block;font-size:2.7rem;color:var(--blue);margin-top:12px;line-height:1.2}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.operation{margin-bottom:20px}.operation form{margin-top:20px}.operation h2{font-size:1.3rem}.lab-workspace{border:1px solid var(--line);border-radius:20px;overflow:hidden}.lab-controls{padding:30px;background:var(--surface)}#network-scene{height:430px;position:relative;background:var(--navy)}#network-scene canvas{display:block;width:100%;height:100%;touch-action:pan-y}.scene-fallback{padding:60px;color:white;text-align:center;max-width:600px;margin:auto}#lab-feedback{margin-top:25px;background:#fff;padding:18px;border-radius:8px;border:1px solid var(--line)}#xr-controls:empty{display:none}.skip{position:absolute;top:-100px;background:white;padding:10px;z-index:100}.skip:focus{top:0}.pagination{margin-top:25px}.pagination svg,nav[role=navigation] svg{width:20px;height:20px}nav[role=navigation]{margin-top:25px}nav[role=navigation] span,nav[role=navigation] a{display:inline-block;padding:5px}nav[role=navigation] .hidden{display:none}
@media(max-width:1080px){.header-inner{gap:18px;padding-block:18px}.main-nav{order:3;width:100%;justify-content:center;gap:30px}.main-nav a{padding-block:7px}.header-actions{margin-inline-start:auto}.hero{gap:28px}.container{padding-inline:25px}.admin-shell{grid-template-columns:190px minmax(0,1fr);gap:20px}.hero-copy h1{font-size:2.8rem}.network-node{min-width:58px}.hero-lab{padding:23px}}
@media(max-width:760px){body{font-size:16px}.container{padding-inline:20px}.header-inner{gap:12px}.brand{font-size:1.4rem}.brand-letter{font-size:2.6rem}.header-actions{gap:12px}.header-actions .cart-link{display:none}.main-nav{gap:24px;justify-content:space-between}.main-nav a{font-size:.94rem}.hero{grid-template-columns:1fr;padding-top:10px;gap:25px}.hero-copy h1{font-size:2.6rem}.hero-lab{min-height:365px}.grid.three,.grid.two,.split{grid-template-columns:1fr}.section-heading{display:block}.blue-band{display:block;padding:25px}.blue-band .button{margin-top:25px}.footer-grid{grid-template-columns:1fr;gap:25px}.footer-bottom{gap:20px}.filter-bar{flex-wrap:wrap}.filter-bar label,.filter-bar .search-label{flex-basis:100%}.auth-shell{grid-template-columns:1fr}.auth-story{padding:30px}.auth-story h1{font-size:2rem}.auth-pattern{display:none}.auth-form{padding:28px}.admin-shell{grid-template-columns:1fr}.admin-nav{display:flex;flex-wrap:wrap;gap:3px}.admin-nav .eyebrow,.admin-nav h2{width:100%;margin-bottom:8px}.admin-nav a{font-size:.875rem;padding:6px 10px}.form-grid{grid-template-columns:1fr}.span-two{grid-column:auto}.panel{padding:22px}.between{flex-wrap:wrap}.page-heading.between{display:block}.record-row{flex-wrap:wrap}.sticky{position:static}#network-scene{height:300px}.lab-controls{padding:22px}.feature-card p{min-height:0}.section{margin-top:30px}.header-actions .button{padding:8px 12px}.main-content{padding-top:25px}.hero-meta{gap:15px}.footer-brand{justify-content:start}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}