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:root{--paper:#f7fbff;--paper-2:#eef3fa;--paper-3:#e3eaf4;--surface:#fff;--line:#e0e7f1;--line-strong:#c9d3e1;--ink:#262626;--ink-strong:#15181d;--text:#262b33;--text-2:#4a525e;--muted:#6b7482;--accent:#2f6bff;--accent-strong:#1f55e6;--accent-soft:#e9f0ff;--accent-ink:#1b3fa8;--success:#12a26b;--success-soft:#e3f6ee;--danger:#e5484d;--danger-soft:#fdeceb;--star:#f5b100;--arrow:var(--ink);--arrow-dim:#c4cbd6;--r-xs:8px;--r-sm:10px;--r:14px;--r-lg:18px;--r-xl:26px;--shadow-xs:0 1px 2px #1118270f;--shadow-sm:0 1px 2px #1118270d, 0 3px 10px -4px #11182714;--shadow:0 1px 2px #1118270d, 0 12px 32px -14px #1118272e;--shadow-lg:0 2px 6px #1118270f, 0 32px 72px -26px #11182752;--ring:0 0 0 3px #2f6bff4d;--font:var(--font-body,"Inter"), "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;--font-display:var(--font-heading,"Outfit"), var(--font-body,"Inter"), "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;--ease:cubic-bezier(.2, .8, .2, 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100% - 2 * var(--gutter));margin-inline:auto}.center{text-align:center}.fine{color:var(--muted);font-size:.9rem}.muted{color:var(--muted)}kbd{background:var(--surface);border:1px solid var(--line-strong);color:var(--text);border-bottom-width:2px;border-radius:6px;padding:0 6px;font-family:inherit;font-size:.82em;font-weight:600}.eyebrow{letter-spacing:.1em;text-transform:uppercase;color:var(--accent-strong);align-items:center;gap:10px;margin:0 0 16px;font-size:.78rem;font-weight:700;display:inline-flex}.eyebrow:before{content:"";background:currentColor;border-radius:2px;width:22px;height:2px;-webkit-mask:linear-gradient(90deg,#000 70%,#0000 0)}.lead{color:var(--text-2);max-width:60ch;font-size:clamp(1.05rem,1.5vw,1.2rem)}.btn{min-height:46px;font-family:var(--font);letter-spacing:-.005em;white-space:nowrap;transition:transform .16s var(--ease), background-color .16s, box-shadow .16s, border-color .16s, color .16s;-webkit-user-select:none;user-select:none;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:9px;padding:0 20px;font-size:.97rem;font-weight:650;line-height:1;text-decoration:none;display:inline-flex;position:relative}.btn:active{transform:translateY(1px)scale(.98)}.btn[disabled],.btn[aria-disabled=true]{opacity:.45;pointer-events:none}.btn-primary{background:var(--ink-strong);color:#fff;box-shadow:inset 0 1px #ffffff1f,0 8px 22px -10px #15181db3}.btn-primary:hover{color:#fff;background:#262b33}.btn-primary .btn-arrow{transition:transform .2s var(--ease)}.btn-primary:hover .btn-arrow{transform:translate(3px)}.btn-accent{background:var(--accent);color:#fff;box-shadow:0 8px 22px -10px #2f6bffcc}.btn-accent:hover{background:var(--accent-strong);color:#fff}.btn-secondary{background:var(--surface);color:var(--ink-strong);border-color:var(--line-strong);box-shadow:var(--shadow-xs)}.btn-secondary:hover{border-color:var(--ink-strong);color:var(--ink-strong)}.btn-ghost{color:var(--text-2);background:0 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var(--line);border-radius:var(--r-xl);box-shadow:var(--shadow-sm);padding:clamp(20px,3vw,28px)}.chip{letter-spacing:.01em;background:var(--paper-2);height:24px;color:var(--text-2);white-space:nowrap;border:1px solid #0000;border-radius:999px;align-items:center;gap:5px;padding:0 10px;font-size:.74rem;font-weight:650;display:inline-flex}.chip svg{flex:none}.chip-tutorial{color:#0b6aa2;background:#e5f4ff}.chip-medium{color:#0a7a52;background:#e3f6ee}.chip-challenging{color:#1f4fd1;background:#e9f0ff}.chip-hard{color:#6b2fc2;background:#f2eaff}.chip-veryhard{color:#a35800;background:#fff2dc}.chip-advanced{color:#b3321d;background:#ffe9e4}.chip-expert{color:#f1eaff;background:#2e2540}.chip-master{background:var(--ink-strong);color:#ffd36e}.chip-challenge{color:#8a6200;background:#fff6d6}.chip-theme{background:var(--surface);color:var(--ink-strong);border-color:var(--line)}.bar{background:var(--paper-3);border-radius:99px;height:6px;overflow:hidden}.bar>span{border-radius:inherit;background:var(--accent);height:100%;transition:width .5s var(--ease);display:block}.section{padding:clamp(64px,9vw,112px) 0}.section-tight{padding:clamp(48px,6vw,72px) 0}.section-head{text-align:center;max-width:680px;margin:0 auto clamp(32px,4vw,52px)}.section-head .eyebrow{justify-content:center}.section-head p:not(.eyebrow){color:var(--muted);margin:0;font-size:1.06rem}.section-alt{background:var(--surface);border-block:1px solid var(--line)}.two-col{grid-template-columns:1fr;gap:20px;display:grid}@media (min-width:900px){.two-col{grid-template-columns:1fr 1fr}}.nav{z-index:50;padding-top:var(--safe-t);-webkit-backdrop-filter:saturate(1.6)blur(16px);background:#f7fbffc7;border-bottom:1px solid #0000;transition:border-color .25s,background-color .25s,box-shadow .25s;position:sticky;top:0}.nav[data-scrolled=true]{border-bottom-color:var(--line);background:#ffffffdb;box-shadow:0 6px 24px -18px #11182759}.nav-inner{height:var(--nav-h);align-items:center;gap:12px;display:flex}.brand{color:var(--ink-strong);border-radius:12px;flex:none;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.brand:hover{color:var(--ink-strong)}.brand-name{font-family:var(--font-display);letter-spacing:-.015em;font-size:1.22rem;font-weight:800}.brand-mark{transition:transform .35s var(--spring)}.brand:hover .brand-mark{transform:rotate(-6deg)scale(1.04)}.nav-links{align-items:center;gap:2px;margin:0 auto;padding:0 6px;display:none;position:relative}.nav-link{height:42px;color:var(--text-2);letter-spacing:-.005em;border-radius:10px;align-items:center;padding:0 14px;font-size:.95rem;font-weight:560;text-decoration:none;transition:color .15s,background-color .15s;display:inline-flex;position:relative}.nav-link:hover{color:var(--ink-strong);background:#1118270a}.nav-link[aria-current=page]{color:var(--ink-strong);font-weight:650}.nav-indicator{background:var(--ink-strong);width:0;height:2px;transform:translateX(var(--x,0));width:var(--w,0);opacity:0;transition:transform .35s var(--ease-out), width .35s var(--ease-out), opacity .2s;pointer-events:none;border-radius:2px;position:absolute;bottom:2px;left:0}.nav-indicator:after{content:"";border-left:7px solid var(--ink-strong);border-top:4.5px solid #0000;border-bottom:4.5px solid #0000;position:absolute;top:50%;right:-5px;transform:translateY(-50%)}.nav-indicator[data-on=true]{opacity:1}.nav-actions{align-items:center;gap:10px;margin-left:auto;display:flex}.nav-progress{border:1px solid var(--line);background:var(--surface);height:40px;color:var(--text);box-shadow:var(--shadow-xs);border-radius:999px;align-items:center;gap:8px;padding:0 14px 0 10px;font-size:.86rem;font-weight:600;text-decoration:none;transition:border-color .15s;display:none}.nav-progress:hover{border-color:var(--line-strong);color:var(--ink-strong)}.nav-progress .star{color:var(--star);display:inline-flex}.nav-progress .sep{background:var(--line);width:1px;height:16px}.nav-cta{border-radius:11px;height:42px;min-height:42px;padding:0 16px 0 14px;font-size:.93rem}.nav-burger{border:1px solid var(--line);background:var(--surface);width:44px;height:44px;box-shadow:var(--shadow-xs);border-radius:12px;flex:none;place-items:center;padding:0;transition:border-color .15s,background-color .15s;display:inline-grid;position:relative}.nav-burger:hover{border-color:var(--line-strong)}.burger-lines{width:18px;height:12px;position:relative}.burger-lines span{background:var(--ink-strong);height:2px;transition:transform .3s var(--ease-out), opacity .2s, width .3s var(--ease-out);border-radius:2px;position:absolute;left:0}.burger-lines span:first-child{width:18px;top:0}.burger-lines span:nth-child(2){width:12px;top:5px}.burger-lines span:nth-child(3){width:15px;top:10px}.nav-burger[aria-expanded=true] .burger-lines span:first-child{width:18px;transform:translateY(5px)rotate(45deg)}.nav-burger[aria-expanded=true] .burger-lines span:nth-child(2){opacity:0;transform:translate(-4px)}.nav-burger[aria-expanded=true] .burger-lines span:nth-child(3){width:18px;transform:translateY(-5px)rotate(-45deg)}@media (max-width:359px){.nav-cta .cta-text{display:none}.nav-cta{justify-content:center;width:44px;padding:0}.nav-cta .btn-arrow{display:none}}@media (min-width:960px){.nav-links{display:flex}.nav-links+.nav-actions{margin-left:0}.nav-burger{display:none}}@media (min-width:1140px){.nav-progress{display:inline-flex}}.nav[data-variant=game]{--nav-h:56px;background:var(--paper);border-bottom-color:var(--line);box-shadow:none;-webkit-backdrop-filter:none;position:relative}.nav[data-variant=game] .brand-name{font-size:1.1rem}.nav[data-variant=game] .nav-link{height:38px;padding:0 12px;font-size:.9rem}@media (max-width:380px){.nav[data-variant=game] .brand-name{display:none}}.drawer-root{z-index:80;pointer-events:none;position:fixed;inset:0}.drawer-root[data-open=true]{pointer-events:auto}.drawer-scrim{opacity:0;transition:opacity .3s var(--ease);-webkit-backdrop-filter:blur(2px);background:#0f141e61;position:absolute;inset:0}.drawer-root[data-open=true] .drawer-scrim{opacity:1}.drawer{background:var(--paper);width:min(380px,88vw);box-shadow:var(--shadow-lg);border-left:1px solid var(--line);padding:calc(12px + var(--safe-t)) calc(16px + var(--safe-r)) calc(16px + var(--safe-b)) 16px;transition:transform .42s var(--ease-out);overscroll-behavior:contain;flex-direction:column;display:flex;position:absolute;top:0;bottom:0;right:0;overflow-y:auto;transform:translate(104%)}.drawer-root[data-open=true] .drawer{transform:none}.drawer-head{justify-content:space-between;align-items:center;gap:12px;height:52px;margin-bottom:14px;display:flex}.drawer-card{border-radius:var(--r-lg);background:var(--ink-strong);color:#e8ecf3;box-shadow:var(--shadow);margin-bottom:18px;padding:16px;position:relative;overflow:hidden}.drawer-card .thumb{opacity:.22;width:132px;position:absolute;top:-14px;right:-18px}.drawer-card .thumb .thumb-lines{stroke:#fff}.drawer-card .thumb .thumb-heads{fill:#fff;stroke:#fff}.drawer-card small{letter-spacing:.08em;text-transform:uppercase;color:#9fb3d9;font-size:.72rem;font-weight:700;display:block}.drawer-card strong{font-family:var(--font-display);letter-spacing:-.02em;color:#fff;margin:2px 0 6px;font-size:1.35rem;display:block}.drawer-stats{color:#c3cad8;gap:14px;margin-bottom:14px;font-size:.85rem;display:flex}.drawer-stats span{align-items:center;gap:5px;display:inline-flex}.drawer-stats svg{color:var(--star)}.drawer-card .btn{color:var(--ink-strong);box-shadow:none;background:#fff;position:relative}.drawer-card .btn:hover{background:#eef3fa}.drawer-nav{gap:4px;display:grid}.drawer-link{min-height:60px;color:var(--ink-strong);transition:background-color .15s, transform .2s var(--ease);opacity:0;border-radius:14px;align-items:center;gap:14px;padding:8px 12px;text-decoration:none;display:flex;transform:translate(14px)}.drawer-root[data-open=true] .drawer-link{opacity:1;transition:opacity .35s var(--ease) calc(var(--i) * 40ms + 80ms), transform .45s var(--ease-out) calc(var(--i) * 40ms + 80ms), background-color .15s;transform:none}.drawer-link:hover{background:var(--surface);color:var(--ink-strong)}.drawer-link:active{transform:scale(.98)}.drawer-link[aria-current=page]{background:var(--surface);box-shadow:inset 0 0 0 1px var(--line)}.drawer-ico{background:var(--surface);border:1px solid var(--line);width:40px;height:40px;color:var(--ink-strong);border-radius:12px;flex:none;place-items:center;display:grid}.drawer-link[aria-current=page] .drawer-ico{background:var(--ink-strong);border-color:var(--ink-strong);color:#fff}.drawer-txt{flex:1;min-width:0;line-height:1.25;display:grid}.drawer-txt b{font-size:1rem;font-weight:650}.drawer-txt small{color:var(--muted);font-size:.83rem}.drawer-link>svg:last-child{color:var(--line-strong);flex:none}.drawer-foot{flex-wrap:wrap;gap:6px 16px;margin-top:auto;padding-top:20px;font-size:.86rem;display:flex}.drawer-foot a{color:var(--muted);padding:6px 0;text-decoration:none}.drawer-foot a:hover{color:var(--ink-strong)}html.drawer-open,html.drawer-open 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