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transparent);text-decoration:none}.side-nav,.mobile-side-drawer{background:radial-gradient(240px 180px at 0% 8%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 72%), radial-gradient(260px 220px at 100% 30%, color-mix(in srgb, var(--accent-2) 8%, transparent), transparent 76%), linear-gradient(180deg, color-mix(in srgb, var(--bg2) 94%, #020817), color-mix(in srgb, var(--bg) 98%, #020817)), var(--bg2);border-right:1px solid color-mix(in srgb, var(--accent) 16%, var(--border));box-shadow:18px 0 44px #00000042}.side-nav{overflow:visible}.side-nav-inner{flex-direction:column;gap:.95rem;width:100%;height:100%;min-height:0;padding:.9rem .75rem;display:flex}.side-shell-head{justify-content:space-between;align-items:center;gap:.5rem;min-height:42px;display:flex}.side-brand{border-radius:10px;min-width:0;margin:0;padding:.28rem .38rem}.side-brand .brand-logo{filter:drop-shadow(0 8px 18px #0000003d);height:34px}.side-brand .brand-name{letter-spacing:0;font-size:1.02rem;transition:opacity .18s 80ms,transform .24s,max-width .24s}.side-collapse-btn{border:1px solid color-mix(in srgb, var(--accent) 38%, var(--border));background:radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent) 26%, transparent), transparent 62%), linear-gradient(160deg, color-mix(in srgb, var(--bg3) 86%, transparent), color-mix(in srgb, var(--bg) 64%, transparent));width:36px;height:36px;color:color-mix(in srgb, var(--accent) 86%, var(--text));box-shadow:0 0 0 1px color-mix(in srgb, var(--accent) 10%, transparent), 0 10px 24px #0000002e, 0 0 18px color-mix(in srgb, var(--accent) 20%, transparent);border-radius:10px;flex:none;transition:transform .18s,color .18s,border-color .18s,background .18s,box-shadow .22s}.side-collapse-btn:hover{color:#fff;border-color:color-mix(in srgb, var(--accent) 68%, var(--border));background:radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent) 34%, transparent), transparent 64%), linear-gradient(160deg, color-mix(in srgb, var(--accent) 18%, var(--bg3)), color-mix(in srgb, var(--accent-2) 8%, var(--bg)));box-shadow:0 0 0 1px color-mix(in srgb, var(--accent) 28%, transparent), 0 0 22px color-mix(in srgb, var(--accent) 44%, transparent);transform:translateY(-1px)}.side-collapse-btn:active{transform:translateY(0)scale(.96)}.side-collapse-btn svg{filter:drop-shadow(0 0 6px color-mix(in srgb, var(--accent) 48%, transparent))}.side-user{color:var(--text);border:1px solid color-mix(in srgb, var(--accent) 24%, var(--border));background:radial-gradient(180px 90px at 0% 0%, color-mix(in srgb, var(--accent-2) 13%, transparent), transparent 70%), linear-gradient(145deg, color-mix(in srgb, var(--bg3) 84%, transparent), color-mix(in srgb, var(--bg) 76%, transparent));border-radius:12px;align-items:center;gap:.75rem;padding:.8rem;transition:padding .24s cubic-bezier(.22,1,.36,1),border-color .2s,background .2s,transform .2s;display:flex;position:relative;box-shadow:inset 0 1px #ffffff08}.side-user:hover{border-color:color-mix(in srgb, var(--accent-2) 36%, var(--border));background:radial-gradient(180px 90px at 0% 0%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 70%), linear-gradient(145deg, color-mix(in srgb, var(--accent) 8%, var(--bg3)), color-mix(in srgb, var(--bg) 78%, transparent));text-decoration:none;transform:translate(2px)}.side-user .avatar{box-shadow:inset 0 0 0 1px #ffffff26, 0 0 0 3px color-mix(in srgb, var(--bg3) 72%, transparent), 0 8px 22px #0000002e;transition:box-shadow .22s,transform .22s}.side-user-copy{opacity:1;gap:.12rem;min-width:0;max-width:150px;transition:opacity .18s 80ms,transform .24s,max-width .24s;display:grid;transform:translate(0)}.side-user-copy strong,.side-user-copy span,.side-user-copy small{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.side-user-copy strong{font-size:.95rem;line-height:1.15}.side-user-copy span{color:var(--muted);font-size:.78rem}.side-user-copy small{color:color-mix(in srgb, var(--accent) 76%, var(--muted));font-size:.72rem;font-weight:700}.side-links{gap:.62rem;min-height:0;padding:.1rem 0;display:grid;overflow:visible}.side-link-group{gap:.22rem;min-width:0;display:grid}.side-section-label{color:color-mix(in srgb, var(--accent) 62%, var(--muted));letter-spacing:.14em;text-transform:uppercase;padding:.16rem .72rem .08rem;font-size:.62rem;font-weight:900;line-height:1.2}.side-link{width:100%;min-height:44px;color:color-mix(in srgb, var(--text) 82%, transparent);font:inherit;text-align:left;cursor:pointer;isolation:isolate;background:0 0;border:1px solid #0000;border-radius:11px;align-items:center;gap:.72rem;padding:.62rem .7rem;font-weight:700;transition:color .18s,background .18s,border-color .18s,box-shadow .24s,transform .2s,padding .24s cubic-bezier(.22,1,.36,1);display:flex;position:relative}@media (hover:hover){.side-link:hover{color:var(--text);background:radial-gradient(140px 90px at 0% 50%, color-mix(in srgb, var(--accent) 13%, transparent), 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.container{width:calc(100% - var(--auth-sidebar-width));max-width:none;margin-left:var(--auth-sidebar-width);margin-right:0;padding:1.4rem clamp(1rem,2vw,2rem)}.app-shell-auth .container>*{width:min(100%, var(--auth-page-max,1180px));max-width:none;margin-left:auto;margin-right:auto}.app-shell-auth .container>.challenge-layout{--auth-page-max:none;width:100%;max-width:none}.dashboard-page{--auth-page-max:1480px}.choose-path{--auth-page-max:980px}.support-wrap{--auth-page-max:720px}.settings-page{--auth-page-max:660px}.cert-page{--auth-page-max:1080px}.lb-list{--auth-page-max:760px}.app-shell-auth .footer{width:calc(100% - var(--auth-sidebar-width));margin-left:var(--auth-sidebar-width);margin-top:2rem}:root[data-sidebar-motion=collapsing] .app-shell-auth .navbar,:root[data-sidebar-motion=collapsing] .app-shell-auth .container,:root[data-sidebar-motion=collapsing] .app-shell-auth .footer{animation:.24s cubic-bezier(.22,1,.36,1) both 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.side-brand{justify-content:center;width:100%;padding:.25rem 0}:root[data-sidebar=collapsed] .desktop-side-nav .side-brand .brand-name,:root[data-sidebar=collapsed] .desktop-side-nav .side-user-copy,:root[data-sidebar=collapsed] .desktop-side-nav .side-link span{opacity:0;pointer-events:none;max-width:0;transition-delay:0s;transform:translate(-8px)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user{border-color:color-mix(in srgb, var(--accent-2) 22%, transparent);background:radial-gradient(circle at 50% 10%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 66%), color-mix(in srgb, var(--bg3) 45%, transparent);border-radius:16px;justify-content:center;width:50px;height:50px;padding:0;box-shadow:inset 0 1px #ffffff0a}:root[data-sidebar=collapsed] .desktop-side-nav .side-user .avatar{box-shadow:inset 0 0 0 1px #ffffff29, 0 0 0 4px color-mix(in srgb, var(--bg3) 88%, transparent), 0 0 18px color-mix(in srgb, var(--accent-2) 28%, transparent);transform:scale(1)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover{border-color:color-mix(in srgb, var(--accent-2) 36%, transparent);background:radial-gradient(circle at 50% 10%, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 66%), color-mix(in srgb, var(--bg3) 54%, transparent);box-shadow:0 0 20px color-mix(in srgb, var(--accent-2) 16%, transparent)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover .avatar{box-shadow:inset 0 0 0 1px #ffffff2e, 0 0 0 4px color-mix(in srgb, var(--accent-2) 16%, var(--bg3)), 0 0 22px color-mix(in srgb, var(--accent-2) 42%, transparent);transform:scale(1.06)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:hover{transform:translate(0)}:root[data-sidebar=collapsed] .desktop-side-nav .side-links,:root[data-sidebar=collapsed] .desktop-side-nav .side-bottom{width:100%}:root[data-sidebar=collapsed] .desktop-side-nav .side-links{gap:.4rem}:root[data-sidebar=collapsed] .desktop-side-nav .side-link-group{width:100%}:root[data-sidebar=collapsed] .desktop-side-nav .side-section-label{display:none}:root[data-sidebar=collapsed] .desktop-side-nav .side-link{border-radius:14px;justify-content:center;gap:0;width:48px;min-height:46px;margin-inline:auto;padding:.62rem}:root[data-sidebar=collapsed] .desktop-side-nav .side-link.active{box-shadow:inset 0 -3px 0 color-mix(in srgb, var(--accent) 70%, var(--accent-2)), 0 0 0 1px color-mix(in srgb, var(--accent) 12%, transparent), 0 14px 26px #0000002e, 0 0 20px color-mix(in srgb, var(--accent) 16%, transparent)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:after,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:after{content:attr(data-label);z-index:80;border:1px solid color-mix(in srgb, var(--accent) 22%, var(--border));background:color-mix(in srgb, var(--bg2) 92%, #020817);min-width:max-content;max-width:220px;color:var(--text);letter-spacing:0;opacity:0;pointer-events:none;transform-origin:0;border-radius:8px;padding:.45rem .65rem;font-size:.82rem;font-weight:800;line-height:1;transition:opacity .16s,transform .2s cubic-bezier(.22,1,.36,1);position:absolute;top:50%;left:calc(100% + .65rem);transform:translate(-8px,-50%)scale(.96);box-shadow:0 14px 34px #00000057}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:before{content:"";z-index:81;border-left:1px solid color-mix(in srgb, var(--accent) 22%, var(--border));border-bottom:1px solid color-mix(in srgb, var(--accent) 22%, var(--border));background:color-mix(in srgb, var(--bg2) 92%, #020817);opacity:0;pointer-events:none;width:8px;height:8px;transition:opacity .16s,transform .2s cubic-bezier(.22,1,.36,1);position:absolute;top:50%;left:calc(100% + .43rem);transform:translate(-8px,-50%)rotate(45deg)scale(.9)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover:after,:root[data-sidebar=collapsed] .desktop-side-nav .side-user:focus-visible:after,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:hover:after,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:focus-visible:after,:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-user:focus-visible:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:hover:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:focus-visible:before{opacity:1;transform:translateY(-50%)scale(1)}:root[data-sidebar=collapsed] .desktop-side-nav .side-user:hover:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-user:focus-visible:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:hover:before,:root[data-sidebar=collapsed] .desktop-side-nav .side-link:focus-visible:before{transform:translateY(-50%)rotate(45deg)scale(1)}}@media (width<=920px){.desktop-side-nav{display:none}.auth-topbar{z-index:30;min-height:58px;position:sticky;top:0}.auth-topbar .topbar-context,.auth-topbar .topbar-avatar{display:none}.auth-topbar .topbar-brand{margin-right:auto;display:inline-flex}.auth-topbar .brand-name{display:none}.auth-topbar .nav-meta{margin-left:auto}.auth-topbar .auth-menu-toggle{display:inline-flex}.drawer-backdrop{z-index:35;opacity:0;pointer-events:none;background:#00000094;border:0;padding:0;transition:opacity .18s;display:block;position:fixed;inset:0}.drawer-backdrop.open{opacity:1;pointer-events:auto}body.mobile-drawer-lock{overscroll-behavior:none;touch-action:none;width:100%;position:fixed;left:0;right:0;overflow:hidden}.mobile-side-drawer{z-index:45;overscroll-behavior:none;touch-action:none;contain:layout paint;width:min(86vw,320px);height:100svh;max-height:100svh;transition:transform 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.side-link-group{flex:none;gap:.16rem}.mobile-side-drawer .side-section-label{padding-top:.25rem;font-size:.68rem}.mobile-side-drawer .side-bottom{padding-top:1rem;padding-bottom:calc(env(safe-area-inset-bottom,0px) + 7rem);flex:none;margin-top:.8rem}.mobile-side-drawer .side-bottom .side-link{min-height:52px}}@media (width<=620px){.auth-topbar .xp-chip{display:none}}@media (width<=420px){.auth-topbar .streak-chip{display:none}}@media (prefers-reduced-motion:reduce){.desktop-side-nav,.app-shell-auth .navbar,.app-shell-auth .container,.app-shell-auth .footer,.side-brand .brand-name,.side-user,.side-user-copy,.side-link,.side-section-label,.side-link span,.side-link svg,.desktop-side-nav .side-user:before,.desktop-side-nav .side-user:after,.desktop-side-nav .side-link:before,.desktop-side-nav .side-link:after{transition:none!important}:root[data-sidebar-motion] .app-shell-auth .navbar,:root[data-sidebar-motion] .app-shell-auth .container,:root[data-sidebar-motion] .app-shell-auth .footer{animation:none!important}}.landing{flex-direction:column;gap:1rem;display:flex}.hero{text-align:center;padding:3rem 1rem 2rem}.hero-logo{object-fit:contain;width:auto;max-width:200px;height:auto;max-height:96px;margin-bottom:1rem}.hero-title{margin:.2rem 0;font-size:2.6rem;font-weight:800;line-height:1.15}.hero-title .brand-accent{background:linear-gradient(90deg, var(--accent), var(--accent-2));color:#0000;-webkit-background-clip:text;background-clip:text}.hero-sub{max-width:620px;color:var(--muted);margin:1rem auto;font-size:1.05rem;line-height:1.6}.hero-cta{flex-wrap:wrap;justify-content:center;gap:.8rem;margin:1.5rem 0;display:flex}.btn-lg{padding:.75rem 1.6rem;font-size:1.05rem}.hero-term{text-align:left;border:1px solid var(--border);background:#0d1117;border-radius:12px;max-width:640px;margin:2rem auto 0;overflow:hidden;box-shadow:0 20px 60px #00000059}.hero-term-bar{background:#161b22;gap:6px;padding:10px 12px;display:flex}.hero-term-bar span{background:#30363d;border-radius:50%;width:11px;height:11px}.hero-term-bar span:first-child{background:#f85149}.hero-term-bar span:nth-child(2){background:#d29922}.hero-term-bar span:nth-child(3){background:#3fb950}.hero-term-body{color:#3fb950;white-space:pre-wrap;margin:0;padding:1rem 1.2rem;font-family:JetBrains Mono,Menlo,monospace;font-size:.85rem;line-height:1.7}.hero-term-body:after{content:"▊";color:#3fb950;animation:1.1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.section{padding:2rem 0}.section-title{text-align:center;margin-bottom:1.5rem;font-size:1.5rem}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem;display:grid}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:1.4rem;transition:transform .18s,border-color .2s,box-shadow 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.15s;display:inline-flex}.badge-share-btn:hover{background:#45d48329}.share-overlay{z-index:1000;background:#05080cbd;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.share-modal{background:var(--surface,#161b22);border:1px solid var(--border,#232a33);border-radius:16px;width:min(560px,100%);max-height:90vh;padding:24px 24px 22px;position:relative;overflow:auto}.share-modal-close{color:var(--muted,#8a93a0);cursor:pointer;background:0 0;border:none;font-size:26px;line-height:1;position:absolute;top:10px;right:14px}.share-modal-close:hover{color:var(--text,#fff)}.share-modal-title{margin:0 0 16px;font-size:1.15rem}.share-modal-card{border:1px solid 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