:root{--color-bg: #0d1b2a;--color-bg-surface: #162032;--color-bg-elevated: #1e2d40;--color-border: #2a3d54;--color-text: #dde4ee;--color-text-muted: #8a9bb0;--color-accent: #00c9b1;--color-accent-hover:#00e5cc;--color-accent-dim: rgba(0, 201, 177, .12);--font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-heading: "Outfit", var(--font-sans);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 16px;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--space-3xl: 4rem;--max-width: 1100px;--nav-height: 64px;--color-nav-bg: rgba(13, 27, 42, .95);--transition: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:var(--color-bg);color:var(--color-text);font-family:var(--font-heading);font-size:1rem;line-height:1.6;min-height:100vh;display:flex;flex-direction:column}a{color:var(--color-accent);text-decoration:none;transition:color var(--transition)}a:hover{color:var(--color-accent-hover)}img{max-width:100%;display:block}ul{list-style:none}h1,h2,h3,h4{font-family:var(--font-heading);line-height:1.2;letter-spacing:-.02em;color:var(--color-text)}h1{font-size:clamp(2rem,5vw,3.25rem)}h2{font-size:clamp(1.4rem,3vw,2rem)}h3{font-size:1.2rem}.container{width:100%;max-width:var(--max-width);margin-inline:auto;padding-inline:var(--space-lg)}.main-content{flex:1;padding-top:var(--nav-height)}.site-nav{position:fixed;top:0;left:0;right:0;height:var(--nav-height);background-color:var(--color-nav-bg);backdrop-filter:blur(8px);border-bottom:1px solid var(--color-border);z-index:100}.nav-inner{height:100%;display:flex;align-items:center;gap:var(--space-lg)}.nav-primary{flex:1;display:flex;align-items:center}.nav-links{flex:1;display:flex;align-items:center;gap:var(--space-xs);justify-content:center}.nav-account{display:flex;align-items:center;gap:var(--space-md)}.nav-logo{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;color:var(--color-text);letter-spacing:-.03em;white-space:nowrap}.nav-logo:hover,.nav-logo span{color:var(--color-accent)}.nav-links a{color:var(--color-text-muted);font-size:.9rem;font-weight:500;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-sm);transition:color var(--transition),background-color var(--transition)}.nav-links a:hover{color:var(--color-text);background-color:var(--color-bg-elevated)}.nav-links 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a.active{color:var(--color-accent);background-color:var(--color-accent-dim)}.nav-game-mobile{display:none}@media(max-width:640px){.nav-game-mobile{display:list-item}.nav-item--dropdown{display:none}}.nav-user-link{color:var(--color-text-muted);font-size:.9rem;font-weight:500;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-sm);transition:color var(--transition),background-color var(--transition);text-decoration:none}.nav-user-link:hover{color:var(--color-text);background-color:var(--color-bg-elevated)}.rank-chip{display:inline-flex;align-items:center;gap:5px;padding:.2em .8em;border-radius:999px;font-size:.78rem;font-weight:700;letter-spacing:.04em;border:1.5px solid 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.nav-avatar-img{width:28px;height:28px}.nav-rank-badge{position:absolute;bottom:-2px;right:-4px;font-size:.7rem;line-height:1;background:var(--color-bg-surface);border-radius:50%;padding:1px 2px;border:1px solid var(--color-border)}.nav-user-card{display:none;align-items:center;gap:var(--space-md);text-decoration:none;color:var(--color-text);padding:var(--space-sm) 0;width:100%}.nav-user-card-avatar{position:relative;flex-shrink:0}.nav-user-card-avatar .nav-avatar-img{width:40px;height:40px}.nav-rank-badge--card{font-size:.75rem;padding:1px 3px}.nav-user-card-info{display:flex;flex-direction:column;gap:4px}.nav-user-card-name{font-weight:600;font-size:.95rem;color:var(--color-text)}.nav-user-card .rank-chip{font-size:.72rem;padding:.15em .6em}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:36px;height:36px;background:none;border:none;cursor:pointer;padding:4px;border-radius:var(--radius-sm)}.nav-toggle:hover{background-color:var(--color-bg-elevated)}.nav-toggle span{display:block;width:100%;height:2px;background-color:var(--color-text);border-radius:2px;transition:transform var(--transition),opacity var(--transition)}.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}.nav-toggle.is-open span:nth-child(2){opacity:0}.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}@media(max-width:640px){.nav-toggle{display:flex;margin-left:auto}.nav-primary{display:none;position:absolute;top:var(--nav-height);left:0;right:0;flex-direction:column;background-color:var(--color-bg-surface);border-bottom:1px solid var(--color-border);padding:var(--space-sm);gap:var(--space-xs)}.nav-primary.is-open{display:flex}.nav-links{flex:unset;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:var(--space-xs);width:100%;padding:0}.nav-links a{padding:var(--space-sm) var(--space-md);font-size:1rem}.nav-account{border-top:1px solid var(--color-border);padding-top:var(--space-sm);width:100%;justify-content:flex-start;flex-direction:column;gap:0}.nav-user-link--avatar{display:none}.nav-user-card{display:flex}.nav-avatar-mini{display:flex;align-items:center;justify-content:center}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:.6rem 1.4rem;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.9rem;font-weight:600;cursor:pointer;border:2px solid transparent;transition:background-color var(--transition),color var(--transition),border-color var(--transition),transform var(--transition)}.btn:hover{transform:translateY(-1px)}.btn:disabled{opacity:.4;cursor:not-allowed;pointer-events:none}.btn-primary{background-color:var(--color-accent);color:#0d1b2a}.btn-primary:hover{background-color:var(--color-accent-hover);color:#0d1b2a}.btn-outline{background-color:transparent;border-color:var(--color-accent);color:var(--color-accent)}.btn-outline:hover{background-color:var(--color-accent-dim);color:var(--color-accent-hover)}.btn-sm{padding:.4rem 1rem;font-size:.8rem;white-space:nowrap}.card{background-color:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-xl);display:flex;flex-direction:column;gap:var(--space-md);transition:border-color var(--transition),transform var(--transition)}.card:hover{border-color:var(--color-accent);transform:translateY(-3px)}.card-icon{font-size:2.5rem;line-height:1}.card-title{font-size:1.3rem}.card-desc{color:var(--color-text-muted);font-size:.95rem;flex:1}.hero{padding:var(--space-3xl) 0 var(--space-2xl);text-align:center}.hero-tagline{margin-top:var(--space-md);font-size:clamp(1rem,2.5vw,1.2rem);color:var(--color-text-muted);max-width:560px;margin-inline:auto}.hero-actions{margin-top:var(--space-xl);display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}.section{padding:var(--space-2xl) 0}.section-title{margin-bottom:var(--space-xl);text-align:center}.puzzle-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-xl)}.about-section{padding:var(--space-2xl) 0;border-top:1px solid var(--color-border)}.about-inner{max-width:680px;margin-inline:auto;text-align:center}.about-inner p{color:var(--color-text-muted);margin-top:var(--space-md);line-height:1.7}.puzzle-hero{padding:var(--space-2xl) 0 var(--space-xl);border-bottom:1px solid var(--color-border)}.puzzle-hero p{margin-top:var(--space-md);color:var(--color-text-muted);font-size:1.05rem}.daily-nudge{background:#00c9b10d;border-bottom:1px solid rgba(0,201,177,.15);padding:var(--space-sm) 0}.daily-nudge--done{background:#00c9b114}.daily-nudge-inner{display:flex;align-items:center;gap:var(--space-md)}.daily-nudge-icon{font-size:1.3rem;flex-shrink:0;line-height:1}.daily-nudge-body{flex:1;min-width:0}.daily-nudge-body strong{display:block;font-size:.875rem;color:var(--color-text)}.daily-nudge-body span{display:block;font-size:.8rem;color:var(--color-text-muted)}@media(max-width:600px){.daily-nudge-inner{flex-wrap:wrap}.daily-nudge-inner .btn{width:100%;text-align:center}}.puzzle-layout{padding:var(--space-2xl) 0;display:grid;grid-template-columns:1fr;gap:var(--space-2xl)}@media(min-width:900px){.puzzle-layout{grid-template-columns:1fr 320px}}.difficulty-selector{display:flex;align-items:center;gap:var(--space-md);flex-wrap:wrap;margin-bottom:var(--space-xl)}.difficulty-selector label{font-weight:600;color:var(--color-text-muted);font-size:.9rem;text-transform:uppercase;letter-spacing:.06em}.difficulty-buttons{display:flex;gap:var(--space-sm)}.diff-btn{padding:.4rem 1rem;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg-elevated);color:var(--color-text-muted);font-size:.875rem;font-weight:500;cursor:pointer;transition:border-color var(--transition),color var(--transition),background-color var(--transition)}.diff-btn:hover{border-color:var(--color-accent);color:var(--color-accent)}.diff-btn.active{border-color:var(--color-accent);background-color:var(--color-accent-dim);color:var(--color-accent)}.game-area{background-color:var(--color-bg-surface);border:2px dashed var(--color-border);border-radius:var(--radius-lg);min-height:420px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-md);color:var(--color-text-muted);font-size:.9rem;text-align:center;padding:var(--space-xl)}.game-area-icon{font-size:3rem;opacity:.3}.game-area p{opacity:.5}.sidebar-panel{display:flex;flex-direction:column;gap:var(--space-lg)}.accordion{background-color:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}.accordion-trigger{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-lg);background:none;border:none;color:var(--color-text);font-family:var(--font-sans);font-size:.95rem;font-weight:600;cursor:pointer;text-align:left;transition:background-color var(--transition)}.accordion-trigger:hover{background-color:var(--color-bg-elevated)}.accordion-arrow{font-size:.75rem;transition:transform var(--transition);color:var(--color-text-muted)}.accordion-trigger[aria-expanded=true] .accordion-arrow{transform:rotate(180deg)}.accordion-body{display:none;padding:var(--space-md) var(--space-lg) var(--space-lg);border-top:1px solid var(--color-border);color:var(--color-text-muted);font-size:.9rem;line-height:1.7}.accordion-body.is-open{display:block}.accordion-body ol,.accordion-body ul{padding-left:var(--space-lg);margin-top:var(--space-sm)}.accordion-body li{list-style:decimal;margin-bottom:var(--space-sm)}.site-footer{background-color:var(--color-bg-surface);border-top:1px solid var(--color-border);padding:var(--space-xl) 0;margin-top:auto}.footer-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:var(--space-lg) var(--space-2xl);text-align:center}.footer-brand{font-family:var(--font-heading);font-weight:700;font-size:1.05rem;color:var(--color-text)}.footer-brand span{color:var(--color-accent)}.footer-copy{font-size:.8rem;color:var(--color-text-muted);margin-top:var(--space-xs)}.footer-version{color:var(--color-text-muted);text-decoration:none;transition:color var(--transition)}.footer-version:hover{color:var(--color-accent)}.footer-links{display:flex;gap:var(--space-md)}.footer-links a{font-size:.875rem;color:var(--color-text-muted);transition:color var(--transition)}.footer-links a:hover{color:var(--color-accent)}.footer-tagline{font-size:.8rem;color:var(--color-text-muted);width:100%;text-align:center;padding-top:var(--space-lg);border-top:1px solid var(--color-border);margin-top:var(--space-md)}@media(max-width:540px){.footer-inner{flex-direction:column;align-items:center}.footer-links{flex-wrap:wrap;justify-content:center;gap:var(--space-sm) var(--space-md)}}.leaderboard{margin:var(--space-2xl) 0;border:1px solid var(--color-border);border-radius:var(--radius-lg);overflow:hidden;background:var(--color-bg-surface)}.leaderboard-header{padding:var(--space-md) var(--space-xl);border-bottom:1px solid var(--color-border);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--space-md)}.leaderboard-title{font-size:1.2rem;font-weight:700;color:var(--color-text)}.leaderboard-meta{display:flex;gap:var(--space-md);align-items:center;font-size:.9rem}.leaderboard-puzzle-num{font-weight:600;color:var(--color-accent)}.leaderboard-subtitle{color:var(--color-text-muted)}.leaderboard-body{padding:var(--space-lg) var(--space-xl);overflow-x:auto}.leaderboard-empty,.leaderboard-loading{color:var(--color-text-muted);text-align:center;padding:var(--space-xl)}.leaderboard-table{width:100%;border-collapse:collapse;font-size:.95rem}.leaderboard-table thead{background:var(--color-bg-elevated);border-bottom:2px solid var(--color-border)}.leaderboard-table th{padding:var(--space-md) var(--space-lg);text-align:left;font-weight:600;color:var(--color-text-muted);text-transform:uppercase;font-size:.75rem;letter-spacing:.05em}.leaderboard-table th:last-child{text-align:right}.leaderboard-table td{padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--color-border);color:var(--color-text)}.leaderboard-table tbody tr:hover{background:var(--color-bg-elevated)}.lb-rank{font-weight:700;color:var(--color-accent);width:50px}.lb-player{font-weight:600;flex:1;min-width:150px}.lb-player-wrap{display:flex;align-items:center;gap:8px}.lb-avatar{width:24px;height:24px;border-radius:50%;object-fit:cover;flex-shrink:0}.lb-avatar-initials{display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;font-family:Outfit,system-ui,sans-serif}.lb-time{font-weight:600;text-align:right;min-width:80px}.cta-strip{background:var(--color-bg-surface);border-top:1px solid var(--color-border);padding:var(--space-2xl) 0;text-align:center}.cta-content{max-width:600px;margin:0 auto}.cta-content h2{margin-bottom:var(--space-lg)}.cta-content p{color:var(--color-text-muted);margin-bottom:var(--space-lg);line-height:1.6}.cta-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}@media(max-width:768px){.cta-actions{gap:var(--space-sm)}.cta-actions .btn{flex:1;min-width:140px}}.modal-overlay{position:fixed;inset:0;background:#00000080;display:none;align-items:center;justify-content:center;z-index:1000;backdrop-filter:blur(2px)}.modal-overlay[aria-hidden=true]{display:none}.modal-overlay.modal-visible{display:flex}.modal-card{background:var(--color-bg);border-radius:var(--radius-lg);padding:var(--space-2xl);max-width:500px;box-shadow:0 20px 60px #0000004d;text-align:center}.modal-icon{font-size:3rem;margin-bottom:var(--space-lg)}.modal-card h2{margin-bottom:var(--space-lg);font-size:1.5rem}.modal-stats{margin:var(--space-lg) 0;padding:var(--space-lg);background:var(--color-bg-elevated);border-radius:var(--radius-md);font-size:.95rem}.modal-stats p{margin:0;color:var(--color-text)}.modal-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap;margin-top:var(--space-xl)}.modal-actions .btn{min-width:160px}.badge-toast-container{position:fixed;bottom:var(--space-lg);right:var(--space-lg);display:flex;flex-direction:column;gap:var(--space-sm);align-items:flex-end;z-index:9999;pointer-events:none}.badge-toast{max-width:280px;background:var(--color-bg-elevated);color:var(--color-text);border:1px solid var(--color-border);border-left:3px solid var(--color-accent);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-md);box-shadow:0 8px 32px #00000059;font-size:.9rem;line-height:1.5;pointer-events:auto;animation:slideIn .3s ease-out;word-break:break-word}.badge-toast small{display:block;color:var(--color-text-muted);font-size:.8rem;margin:var(--space-xs) 0}.badge-toast a{color:var(--color-accent);text-decoration:none;font-weight:600;display:inline-block;margin-top:var(--space-xs);border-bottom:1px solid var(--color-accent-dim);transition:border-color .2s}.badge-toast a:hover{border-bottom-color:var(--color-accent)}.rank-toast{border-left-color:#f5c542}.rank-toast a{color:#f5c542;border-bottom-color:#f5c54266}.rank-toast a:hover{border-bottom-color:#f5c542}@keyframes slideIn{0%{transform:translate(400px);opacity:0}to{transform:translate(0);opacity:1}}@media(max-width:600px){.leaderboard-body{padding:var(--space-md)}.leaderboard-table th,.leaderboard-table td{padding:var(--space-sm) var(--space-md);font-size:.85rem}}@media(max-width:480px){.container{padding-inline:var(--space-sm)}}.error-page{display:flex;align-items:center;justify-content:center;min-height:60vh;text-align:center}.error-inner{max-width:480px;margin:0 auto;text-align:center}.error-code{font-size:6rem;font-weight:700;color:var(--color-accent);line-height:1;font-family:var(--font-heading)}.error-title{font-size:1.75rem;font-family:var(--font-heading);margin:var(--space-md) 0 var(--space-sm)}.error-message{color:var(--color-text-muted);margin-bottom:var(--space-xl);line-height:1.6}.error-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}.verify-banner{background:var(--color-accent-dim);border-bottom:1px solid var(--color-accent);color:var(--color-text);padding:var(--space-sm) var(--space-lg);font-size:.9rem;display:flex;align-items:center;justify-content:center;gap:var(--space-md);flex-wrap:wrap;position:relative}.verify-banner-link{color:var(--color-accent);font-weight:600;text-decoration:underline;white-space:nowrap}.verify-banner-link:hover{color:var(--color-accent-hover)}.verify-banner-dismiss{position:absolute;right:var(--space-md);top:50%;transform:translateY(-50%);background:none;border:none;color:var(--color-text-muted);font-size:1.1rem;line-height:1;cursor:pointer;padding:var(--space-xs)}.verify-banner-dismiss:hover{color:var(--color-text)}.cookie-banner{position:fixed;bottom:0;left:0;right:0;background:var(--color-bg-elevated);border-top:1px solid var(--color-border);padding:var(--space-md) var(--space-lg);z-index:9999;box-shadow:0 -4px 20px #0006}.cookie-banner-inner{max-width:960px;margin:0 auto;display:flex;align-items:center;gap:var(--space-lg);flex-wrap:wrap}.cookie-banner-text{flex:1;min-width:200px;margin:0;font-size:.875rem;color:var(--color-text-muted);line-height:1.5}.cookie-banner-text a{color:var(--color-accent);text-decoration:underline}.cookie-banner-actions{display:flex;gap:var(--space-sm);flex-shrink:0}@media(max-width:480px){.cookie-banner-inner{flex-direction:column;align-items:flex-start}.cookie-banner-actions{width:100%}.cookie-banner-actions .btn{flex:1;text-align:center}}.install-banner{position:fixed;bottom:0;left:0;right:0;background:var(--color-bg-elevated);border-top:1px solid var(--color-border);padding:var(--space-md) var(--space-lg);z-index:9998;box-shadow:0 -4px 20px #0006;animation:installSlideUp .3s ease}@keyframes installSlideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.install-banner-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;gap:var(--space-md);flex-wrap:wrap}.install-banner-icon{font-size:1.8rem;flex-shrink:0}.install-banner-text{flex:1;min-width:160px}.install-banner-text strong{display:block;color:var(--color-text);margin-bottom:2px;font-size:.95rem}.install-banner-text span{font-size:.825rem;color:var(--color-text-muted);line-height:1.4}.install-banner-actions{display:flex;gap:var(--space-sm);align-items:center;flex-shrink:0}.install-banner-dismiss{background:none;border:none;cursor:pointer;color:var(--color-text-muted);font-size:1.25rem;padding:4px 8px;line-height:1;transition:color var(--transition)}.install-banner-dismiss:hover{color:var(--color-text)}@media(max-width:480px){.install-banner-inner{flex-direction:column;align-items:flex-start}.install-banner-actions{width:100%}.install-banner-actions .btn{flex:1;text-align:center}}.notif-prompt{position:fixed;bottom:0;left:0;right:0;background:var(--color-bg-elevated);border-top:1px solid var(--color-accent);padding:var(--space-md) var(--space-lg);z-index:9998;box-shadow:0 -4px 20px #0006;animation:installSlideUp .3s ease}.notif-prompt-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;gap:var(--space-md);flex-wrap:wrap}.notif-prompt-icon{font-size:1.6rem;flex-shrink:0}.notif-prompt-text{flex:1;min-width:160px;font-size:.875rem;color:var(--color-text-muted);line-height:1.5}.notif-prompt-text strong{display:block;color:var(--color-text);margin-bottom:2px}.notif-prompt-actions{display:flex;gap:var(--space-sm);align-items:center;flex-shrink:0}.notif-prompt-dismiss{background:none;border:none;cursor:pointer;color:var(--color-text-muted);font-size:1.25rem;padding:4px 8px;line-height:1;transition:color var(--transition)}.notif-prompt-dismiss:hover{color:var(--color-text)}@media(max-width:480px){.notif-prompt-inner{flex-direction:column;align-items:flex-start}.notif-prompt-actions{width:100%}.notif-prompt-actions .btn{flex:1;text-align:center}}.form-group--checkbox{margin-top:var(--space-sm)}.checkbox-label{display:flex;align-items:center;gap:var(--space-sm);cursor:pointer;font-size:.875rem;font-weight:500;color:var(--color-text-muted);user-select:none}.checkbox-label input[type=checkbox]{width:16px;height:16px;accent-color:var(--color-accent);cursor:pointer;flex-shrink:0}