@import"https://fonts.googleapis.com/css2?family=Syne:wght@700;800&family=Space+Grotesk:wght@300;400;500;600;700&family=Space+Mono:wght@400;700&display=swap";:root{--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px)}body{padding-top:var(--safe-top);padding-bottom:var(--safe-bottom)}.sidebar{padding-left:max(1rem,calc(1rem + var(--safe-left)))}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;width:100%}body{font-family:Space Grotesk,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:#080c14;color:#eef2ff;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}[data-font-size=small] body,[data-font-size=small]{font-size:14px}[data-font-size=medium] body,[data-font-size=medium]{font-size:16px}[data-font-size=large] body,[data-font-size=large]{font-size:18px}:root{--bg-dark: #080c14;--bg-darker: #050810;--bg-card: #0f1520;--bg-elevated: #131e2e;--accent: #6ee7a8;--accent-dark: #4dd491;--accent-darker: #2ab870;--text-primary: #eef2ff;--text-secondary: #9aabbf;--text-muted: #556070;--text-inverse: #080c14;--border: #1e2a3a;--border-light: #2a3a4e;--success: #6ee7a8;--error: #ffadad;--warning: #ffd6a5;--info: #a8c8ff;--diff-novice: #a8c8ff;--diff-apprentice: #6ee7a8;--diff-expert: #ffd6a5;--diff-master: #ffadad;--diff-legend: #ffd66e}h1,h2,h3,h4,h5,h6{font-family:Syne,sans-serif;letter-spacing:-.02em;color:var(--text-primary)}h1{font-size:2rem;font-weight:800;margin:.5rem 0}h2{font-size:1.5rem;font-weight:800;margin:.5rem 0}h3{font-size:1.25rem;font-weight:700;margin:.4rem 0}h4{font-size:1.1rem;font-weight:700;margin:.3rem 0}h5{font-size:1rem;font-weight:700;margin:.2rem 0}h6{font-size:.95rem;font-weight:700;margin:.2rem 0}p{margin:.5rem 0}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.mono,code,pre{font-family:Space Mono,monospace}code{background:var(--bg-darker);border:1px solid var(--border);border-radius:4px;padding:.1em .4em;font-size:.9em}pre{background:var(--bg-darker);border:1px solid var(--border);border-radius:6px;padding:1rem;overflow-x:auto}input,textarea,select{font-family:"Space Grotesk",inherit;font-size:1rem;background-color:var(--bg-card);color:var(--text-primary);border:1px solid var(--border);border-radius:6px;padding:.75rem;transition:border-color .2s,box-shadow .2s;outline:none}input:focus,textarea:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px #6ee7a81a}textarea{resize:vertical;min-height:100px;line-height:1.6}button{font-family:"Space Grotesk",inherit;font-size:1rem;font-weight:600;background-color:var(--accent);color:var(--bg-dark);border:none;border-radius:6px;padding:.75rem 1.5rem;cursor:pointer;transition:background-color .15s,transform .1s}button:hover{background-color:var(--accent-dark)}button:active{transform:scale(.98)}button:disabled{background-color:var(--bg-elevated);color:var(--text-muted);cursor:not-allowed;opacity:.6}button.secondary{background-color:var(--bg-card);color:var(--text-primary);border:1px solid var(--border)}button.secondary:hover{background-color:var(--bg-elevated);border-color:var(--border-light)}button.danger{background-color:var(--error);color:#2a0a0a}button.danger:hover{filter:brightness(1.1)}.app-shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:220px;flex-shrink:0;background:#0c1018;border-right:1px solid #1a2535;display:flex;flex-direction:column;padding:28px 16px;gap:4px;overflow-y:auto}.sidebar-logo{display:flex;align-items:center;gap:10px;padding:0 8px 28px;flex-shrink:0;text-decoration:none}.sidebar-logo-text{font-family:Syne,sans-serif;font-size:1.25rem;font-weight:800;color:var(--accent);letter-spacing:-.02em}.nav-item{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:10px;font-size:.92rem;font-weight:500;cursor:pointer;border:none;font-family:"Space Grotesk",inherit;width:100%;text-align:left;transition:all .15s;color:#4a5a6a;background:transparent;text-decoration:none}.nav-item:hover{background:#131e2e;color:#9aabbf;text-decoration:none}.nav-item.active{background:#6ee7a81a;color:var(--accent);font-weight:600}.nav-icon{font-size:1rem;width:20px;text-align:center;flex-shrink:0}.nav-divider{height:1px;background:#1a2535;margin:12px 8px}.sidebar-bottom{margin-top:auto;padding-top:16px}.sidebar-points{display:flex;align-items:center;gap:8px;padding:0 6px;margin-bottom:10px}.sidebar-points .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 6px var(--accent);flex-shrink:0}.user-card{background:#131e2e;border:1px solid var(--border);border-radius:12px;padding:14px}.user-card-avatar{width:36px;height:36px;border-radius:50%;background:var(--bg-dark);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0;overflow:hidden}.user-card-avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}.main-area{flex:1;overflow-y:auto;background:linear-gradient(180deg,#131c2e,#0f1626 15%,#0c121e,#090e18,#070a12 75%,#04060e);background-attachment:local}.page-content{max-width:860px;margin:0 auto;padding:44px 48px 64px}.page-header{margin-bottom:36px}.page-header h1{margin-bottom:6px}.page-header p{color:var(--text-muted);font-size:.92rem;margin:0}.page-content.full-width{max-width:100%;padding:32px 40px 48px}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.card{background-color:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:1.5rem}.card-header{border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:1rem}.card-footer{border-top:1px solid var(--border);padding-top:1rem;margin-top:1rem;display:flex;gap:1rem;justify-content:flex-end}.badge{display:inline-block;padding:.25rem .7rem;border-radius:20px;font-size:.78rem;font-weight:600;white-space:nowrap}.badge.primary{background:#6ee7a81f;color:var(--accent)}.badge.secondary{background:#9aabbf1f;color:var(--text-secondary)}.badge.danger{background:#ffadad1f;color:var(--error)}.badge.warning{background:#ffd6a51f;color:var(--warning)}.badge.info{background:#a8c8ff1f;color:var(--info)}.badge.gold{background:#ffd66e1f;color:#ffd66e}.alert{border-radius:8px;padding:1rem;margin:1rem 0;font-size:.9rem}.alert.error{background:#ffadad14;border:1px solid rgba(255,173,173,.3);color:#ffbdbd}.alert.success{background:#6ee7a814;border:1px solid rgba(110,231,168,.3);color:#9ef5c8}.alert.warning{background:#ffd6a514;border:1px solid rgba(255,214,165,.3);color:#ffe4b8}.error{background:#ffadad14;border:1px solid rgba(255,173,173,.3);border-radius:8px;padding:1rem;color:#ffbdbd;margin:1rem 0}.success{background:#6ee7a814;border:1px solid rgba(110,231,168,.3);border-radius:8px;padding:1rem;color:#9ef5c8;margin:1rem 0}.warning{background:#ffd6a514;border:1px solid rgba(255,214,165,.3);border-radius:8px;padding:1rem;color:#ffe4b8;margin:1rem 0}.grid{display:grid;gap:1.5rem}.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}.grid-3{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}.flex{display:flex;gap:1rem}.flex-col{display:flex;flex-direction:column;gap:1rem}.flex-center{display:flex;align-items:center;justify-content:center}.justify-between{display:flex;justify-content:space-between}.items-center{display:flex;align-items:center}.gap-1{gap:.5rem}.gap-2{gap:1rem}.gap-3{gap:1.5rem}.m-1{margin:.5rem}.m-2{margin:1rem}.m-3{margin:1.5rem}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.p-1{padding:.5rem}.p-2{padding:1rem}.p-3{padding:1.5rem}.text-sm{font-size:.85rem}.text-xs{font-size:.75rem}.text-lg{font-size:1.25rem}.text-xl{font-size:1.5rem}.text-2xl{font-size:2rem}.text-center{text-align:center}.text-right{text-align:right}.text-primary{color:var(--text-primary)}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-accent{color:var(--accent)}.text-error{color:var(--error)}.text-success{color:var(--success)}.text-warning{color:var(--warning)}.loading{display:flex;align-items:center;justify-content:center;min-height:200px;color:var(--text-muted);font-size:1rem}@keyframes shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}.skeleton{background:linear-gradient(90deg,var(--bg-darker) 25%,rgba(255,255,255,.04) 50%,var(--bg-darker) 75%);background-size:800px 100%;animation:shimmer 1.4s infinite linear;display:block}.solve-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;height:calc(100vh - 100px)}.solve-problem-panel{grid-column:1;grid-row:1}.solve-guide-panel{grid-column:2;grid-row:1}.solve-back-btn-desktop{display:flex;align-items:center;gap:.35rem;background:none;border:none;color:#ffffff80;font-size:1rem;cursor:pointer;padding:0;width:fit-content}.solve-back-btn-desktop:hover{color:#ffffffd9}.solve-back-btn-desktop span{font-size:.82rem;font-weight:500}.progress-bar-track{background:var(--bg-darker);border-radius:20px;height:8px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--accent);border-radius:20px;transition:width .4s ease}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#1e2a3a;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#2a3a4e}@keyframes popupSlideIn{0%{transform:translate(-50%) translateY(-120%);opacity:0}to{transform:translate(-50%) translateY(0);opacity:1}}@keyframes popupSlideOut{0%{transform:translate(-50%) translateY(0);opacity:1}to{transform:translate(-50%) translateY(-120%);opacity:0}}.wrong-popup{position:fixed;top:1.25rem;left:50%;transform:translate(-50%);z-index:9999;width:min(480px,calc(100vw - 2rem));animation:popupSlideIn .3s cubic-bezier(.34,1.56,.64,1) forwards;cursor:pointer}.wrong-popup-inner{display:flex;align-items:flex-start;gap:.75rem;background:#1e1a2e;border:1px solid rgba(255,107,107,.4);border-left:4px solid #ff6b6b;border-radius:12px;padding:1rem 1.1rem;box-shadow:0 8px 32px #00000080,0 0 0 1px #ff6b6b1a;color:var(--text-primary)}@keyframes guideHintGlow{0%,to{box-shadow:0 0 #6ee7a800;border-color:#6ee7a84d}50%{box-shadow:0 0 0 6px #6ee7a826,0 0 20px #6ee7a833;border-color:#6ee7a8cc}}@keyframes guideTabBounce{0%,to{transform:translateY(0)}30%{transform:translateY(-3px)}60%{transform:translateY(-1px)}}.guide-hint-panel{animation:guideHintGlow 2s ease-in-out infinite;border-radius:12px;border:1px solid rgba(110,231,168,.3)}.guide-hint-desktop-btn{background:#6ee7a81a;border:1px solid rgba(110,231,168,.35);color:var(--accent);padding:.35rem .85rem;border-radius:20px;font-size:.82rem;font-weight:600;cursor:pointer;animation:guideHintGlow 2s ease-in-out infinite;transition:background .2s}.guide-hint-desktop-btn:hover{background:#6ee7a833}.solve-mobile-tabs button.guide-hint-tab{color:var(--accent)!important;background:#6ee7a81a!important;animation:guideTabBounce 1.4s ease-in-out infinite,guideHintGlow 2s ease-in-out infinite}@keyframes heartPop{0%{transform:scale(1)}50%{transform:scale(1.4)}to{transform:scale(1)}}@keyframes fadeSlide{0%{opacity:0;transform:translate(8px)}to{opacity:1;transform:none}}.page-enter{animation:fadeSlide .18s ease}.mobile-header,.mobile-bottom-nav,.solve-mobile-tabs,.solve-back-row{display:none}@media (max-width: 900px){.sidebar{width:64px;padding:20px 10px}.sidebar-logo{padding:0 0 20px;justify-content:center}.sidebar-logo-text{display:none}.nav-item>span:not(.nav-icon){display:none}.nav-item{justify-content:center;padding:12px}.sidebar-bottom .user-card,.sidebar-points span{display:none}.page-content{padding:28px 24px 48px}.guest-card{padding:8px;border-radius:10px;text-align:center}.guest-card-eyebrow,.guest-card-meta,.guest-card-bar{display:none}.guest-card button{padding:8px 4px!important;font-size:0!important;width:100%!important;min-width:0!important}.guest-card button:before{font-size:1.1rem}.guest-card button:first-of-type:before{content:"✨"}.guest-card button.secondary:before{content:"🚪"}.guest-card button:first-of-type{margin-top:0!important}}@media (max-width: 768px){.sidebar{display:none}.main-area{padding-top:52px;padding-bottom:calc(64px + var(--safe-bottom))}.main-area-solve{padding-top:0;padding-bottom:0}.mobile-header{display:flex;position:fixed;top:0;left:0;right:0;height:52px;padding:0 16px;padding-top:var(--safe-top);background:#0c1018;border-bottom:1px solid #1a2535;align-items:center;justify-content:space-between;z-index:1000;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.mobile-header-hidden{display:none!important}.mobile-header-logo{display:flex;align-items:center;gap:9px;text-decoration:none;font-family:Syne,sans-serif;font-size:1.15rem;font-weight:800;color:var(--accent);letter-spacing:-.02em}.mobile-header-right{display:flex;align-items:center;gap:10px}.mobile-header-signup{font-size:.82rem;font-weight:700;color:var(--bg-dark);background:var(--accent);padding:6px 14px;border-radius:20px;text-decoration:none;transition:opacity .15s}.mobile-header-signup:hover{opacity:.9;text-decoration:none}.mobile-header-user{display:flex;align-items:center;gap:8px;text-decoration:none;color:inherit}.mobile-header-user:hover{text-decoration:none}.mobile-header-avatar{width:30px;height:30px;border-radius:50%;background:var(--bg-elevated);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;color:var(--text-secondary);overflow:hidden;flex-shrink:0}.mobile-header-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}.mobile-bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;height:calc(64px + var(--safe-bottom));padding-bottom:var(--safe-bottom);background:#0c1018;border-top:1px solid #1a2535;z-index:1000;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.mobile-bottom-nav-hidden{display:none!important}.mobile-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:#4a5a6a;text-decoration:none;padding:6px 4px 4px;transition:color .15s;-webkit-tap-highlight-color:transparent}.mobile-nav-item.active{color:var(--accent)}.mobile-nav-item:hover{color:var(--text-secondary);text-decoration:none}.mobile-nav-item.active:hover{color:var(--accent)}.mobile-nav-icon{font-size:1.35rem;line-height:1;transition:transform .15s}.mobile-nav-item.active .mobile-nav-icon{transform:scale(1.1)}.mobile-nav-label{font-size:.62rem;font-weight:600;letter-spacing:.01em;line-height:1}.mobile-nav-locked{opacity:.35;pointer-events:none}.guest-banner{padding:.55rem .75rem;font-size:.8rem;gap:.5rem}.guest-banner-link{font-size:.8rem}.grid-2,.grid-3{grid-template-columns:1fr}.page-content{padding:20px 16px 32px}.solve-panel-hidden{display:none!important}.solve-back-btn-desktop{display:none}.solve-grid{grid-template-columns:1fr;height:calc(100dvh - 52px);overflow:hidden;display:flex;flex-direction:column;gap:0}.solve-back-row{display:flex;flex-shrink:0;padding:.1rem .25rem 0}.solve-mobile-tabs{display:flex;flex-shrink:0;background:var(--bg-darker);border-bottom:1px solid var(--border)}.solve-mobile-tabs button{flex:1;padding:.75rem;background:none;border:none;border-bottom:2px solid transparent;border-radius:0;color:var(--text-muted);font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.solve-mobile-tabs button.active{color:var(--accent);border-bottom-color:var(--accent);background:#6ee7a80d}.solve-panel{flex:1;overflow-y:auto;padding:1rem;-webkit-overflow-scrolling:touch}.page-content.full-width{padding:0!important}}@media (max-width: 640px){h1{font-size:1.6rem}h2{font-size:1.25rem}h3{font-size:1.1rem}}.share-btn{display:inline-flex;align-items:center;gap:.35rem;padding:.45rem .85rem;font-size:.85rem;font-weight:600;background:var(--bg-darker);border:1px solid var(--border);border-radius:8px;color:var(--text-secondary);text-decoration:none;cursor:pointer;transition:all .15s}.share-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}.onboard-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#080c14d9;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:10000;display:flex;align-items:center;justify-content:center;padding:1rem;animation:onboardFade .2s ease-out}@keyframes onboardFade{0%{opacity:0}to{opacity:1}}.onboard-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:2rem;max-width:480px;width:100%;box-shadow:0 20px 60px #00000080;animation:onboardSlide .3s cubic-bezier(.2,.9,.3,1.2)}@keyframes onboardSlide{0%{transform:translateY(20px) scale(.96);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.onboard-step-icon{font-size:3rem;margin-bottom:1rem;text-align:center}.onboard-dots{display:flex;gap:.4rem;justify-content:center;margin:1.5rem 0 1rem}.onboard-dot{width:8px;height:8px;border-radius:50%;background:var(--border);transition:all .2s}.onboard-dot.active{background:var(--accent);width:22px;border-radius:4px}.feedback-fab{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);padding:.6rem 1rem;border-radius:999px;font-size:.85rem;font-weight:600;cursor:pointer;box-shadow:0 4px 16px #0000004d;z-index:9000;transition:all .15s}.feedback-fab:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}@media (max-width: 768px){.feedback-fab{bottom:calc(64px + var(--safe-bottom) + 10px);right:1rem;width:46px;height:46px;padding:0;border-radius:50%;font-size:1.25rem;display:flex;align-items:center;justify-content:center}.feedback-fab-label{display:none}}.empty-state-cta{display:inline-block;margin-top:1rem;padding:.6rem 1.5rem;background:var(--accent);color:var(--bg-dark);font-weight:600;border-radius:8px;text-decoration:none;transition:transform .15s}.empty-state-cta:hover{transform:translateY(-2px)}.guest-banner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.65rem 1rem;background:linear-gradient(135deg,#6ee7a814,#6ee7a805);border:1px solid rgba(110,231,168,.25);border-radius:10px;font-size:.85rem;color:var(--text-secondary);flex-wrap:wrap}.guest-banner-link{color:var(--accent);font-weight:700;text-decoration:none;white-space:nowrap;font-size:.85rem}.guest-banner-link:hover{text-decoration:underline}.nav-item-locked{opacity:.45;position:relative}.nav-item-locked .nav-lock{margin-left:auto;font-size:.75rem;opacity:.7}.nav-item-locked:hover{opacity:.7}.guest-card{background:linear-gradient(135deg,#6ee7a814,#6ee7a805);border:1px solid rgba(110,231,168,.25);border-radius:12px;padding:12px}.guest-card-eyebrow{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--accent);margin-bottom:4px}.guest-card-meta{font-size:.78rem;color:var(--text-secondary);margin-bottom:8px}.guest-card-bar{width:100%;height:6px;background:var(--bg-darker);border-radius:3px;overflow:hidden}.guest-card-bar-fill{height:100%;background:var(--accent);transition:width .3s}.streak-chip{font-size:.78rem;font-weight:700;color:#ff8c69;background:#ff8c6926;border:1px solid rgba(255,140,105,.3);border-radius:20px;padding:3px 9px;white-space:nowrap}.avatar-picker-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:200}.avatar-picker{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:1.5rem;max-width:340px;width:90%}.avatar-picker-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}.avatar-option{width:100%;aspect-ratio:1;border-radius:12px;border:2px solid transparent;cursor:pointer;font-size:1.6rem;display:flex;align-items:center;justify-content:center;transition:transform .15s,border-color .15s}.avatar-option:hover{transform:scale(1.08)}.avatar-option.selected{border-width:2px}.challenge-share-trigger{font-size:.82rem!important;padding:6px 12px!important;white-space:nowrap;flex-shrink:0}.challenge-share-menu{position:absolute;bottom:calc(100% + 6px);right:0;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:.35rem;z-index:50;min-width:140px;box-shadow:0 8px 24px #0006;display:flex;flex-direction:column;gap:2px}.challenge-share-item{display:block;width:100%;text-align:left;padding:.45rem .75rem;border-radius:7px;font-size:.82rem;color:var(--text-secondary);text-decoration:none;background:none;border:none;cursor:pointer;transition:background .15s,color .15s}.challenge-share-item:hover{background:#6ee7a81a;color:var(--accent)}.leaderboard-summary{border:1px solid rgba(110,231,168,.2);background:linear-gradient(135deg,#6ee7a80d,#0000)}