:root{color-scheme:light;--ink: #1f2933;--muted: #5e6b77;--paper: #fbfaf7;--panel: #ffffff;--line: #dce3e8;--teal: #0e8f88;--teal-dark: #08655f;--coral: #df6556;--gold: #e4ad32;--graphite: #263238;--ok: #2f8f4e;--bad: #b8463f;--shadow: 0 18px 55px rgba(31, 41, 51, .12);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink)}button,input{font:inherit}button,input,a{max-width:100%}a{color:inherit;text-decoration:none}.site-header{align-items:center;background:#fbfaf7e0;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid rgba(220,227,232,.72);display:flex;gap:24px;justify-content:space-between;left:0;min-height:72px;padding:14px clamp(18px,4vw,56px);position:sticky;right:0;top:0;z-index:10}.brand,.nav{align-items:center;display:flex}.brand{font-weight:850;gap:10px}.brand__mark{background:var(--graphite);border-radius:8px;color:#fff;display:grid;height:36px;place-items:center;width:36px}.nav{color:var(--muted);flex-wrap:wrap;font-size:.94rem;gap:6px;justify-content:flex-end}.nav a{border-radius:8px;padding:9px 11px}.nav a:hover,.nav a:focus-visible{background:#eaf2f2;color:var(--ink);outline:none}.nav__button{background:transparent;border:0;border-radius:8px;color:inherit;cursor:pointer;font:inherit;padding:9px 11px}.nav__button:hover,.nav__button:focus-visible{background:#eaf2f2;color:var(--ink);outline:none}.account{align-items:center;display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}.account .button{min-height:40px;padding:8px 14px}.account-menu{position:relative}.account-menu__trigger{background:transparent;border:0;border-radius:50%;cursor:pointer;padding:0}.account-menu__trigger:focus-visible{outline:2px solid var(--teal);outline-offset:2px}.account-menu__avatar{align-items:center;background:var(--teal);border-radius:50%;color:#fff;display:flex;font-weight:900;height:40px;justify-content:center;width:40px}.account-menu__dropdown{background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);min-width:210px;padding:12px;position:absolute;right:0;top:calc(100% + 8px);z-index:30}.account-menu__label{color:var(--muted);font-size:.72rem;font-weight:800;letter-spacing:.02em;margin:0 8px;text-transform:uppercase}.account-menu__nick{font-weight:850;margin:2px 8px 10px;overflow-wrap:anywhere}.account-menu__item{background:transparent;border:0;border-radius:8px;color:var(--ink);cursor:pointer;display:block;font:inherit;font-weight:750;padding:11px 8px;text-align:left;width:100%}.account-menu__item:hover,.account-menu__item:focus-visible{background:#eaf2f2;outline:none}.profile{align-items:center;display:flex;gap:14px;margin-top:18px}.profile__avatar{align-items:center;background:var(--teal);border-radius:50%;color:#fff;display:flex;flex:0 0 auto;font-size:1.5rem;font-weight:900;height:56px;justify-content:center;width:56px}.profile__identity{min-width:0}.profile__nick{font-size:1.15rem;font-weight:850;margin:0;overflow-wrap:anywhere}.profile__email{color:var(--muted);margin:2px 0 0;overflow-wrap:anywhere}.profile__since{color:var(--muted);font-size:.85rem;margin:6px 0 0}.profile-stats{display:grid;gap:10px;grid-template-columns:repeat(3,1fr);margin:22px 0}.profile-stats article{background:#f1f6f6;border-radius:8px;padding:14px 8px;text-align:center}.profile-stats span{display:block;font-size:1.5rem;font-weight:900}.profile-stats p{color:var(--muted);font-size:.8rem;margin:4px 0 0}.profile__reset{width:100%}.quiz-empty{color:var(--muted);font-weight:700;margin:8px 0}#szachy .section__header{max-width:none}#szachy-title{white-space:nowrap}.chess{width:100%}.chess__head,.chess-side{background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 16px 36px #1018200f;height:var(--chess-size);overflow:auto;padding:18px}.chess__head{align-items:flex-start;align-self:start;display:flex;flex-direction:column;gap:6px;margin:0}.chess-levels__label{margin:14px 0 0}.chess-levels{display:flex;flex-direction:column;gap:10px;margin-top:8px;width:100%}.chess-levels .chip{width:100%}.chess-levels--cols{display:grid;grid-template-columns:1fr 1fr}.chess-timer{margin:14px 0 0;width:100%}.chess-navigation{display:grid;gap:10px;grid-template-columns:1fr;margin-top:auto;padding-top:14px;width:100%}.chess-navigation .button{min-width:0;padding-inline:12px;width:100%}.chess__task{font-size:1.15rem;font-weight:850;margin:0}.chess__meta{color:var(--muted);font-weight:700}.chess__layout{--chess-size: clamp(518px, calc(100vw - 880px) , 750px);align-items:start;display:grid;gap:20px;grid-template-columns:432px var(--chess-size) 288px;justify-content:center}.chess__main{display:grid;gap:14px;min-width:0}.chess .sudoku-active-cell{height:auto;min-height:56px}.chess-board{margin:0 auto;max-width:var(--chess-size);width:100%}.chess-board [data-piece] svg,.chess-board [data-piece] img{filter:drop-shadow(0 2px 2px rgba(0,0,0,.25))}.chess-square{align-items:center;border:0;cursor:pointer;display:flex;font-size:clamp(2rem,7vw,3.4rem);justify-content:center;line-height:1;padding:0;position:relative}.chess-coord{color:#281c0c9e;font-size:.62rem;font-weight:800;line-height:1;pointer-events:none;position:absolute}.chess-coord--rank{left:3px;top:3px}.chess-coord--file{bottom:3px;right:4px}.chess-square.is-light{background:#f1e2c6}.chess-square.is-dark{background:#c39b6a}.chess-square.is-selected{box-shadow:inset 0 0 0 4px var(--gold)}.chess-piece[draggable=true]{cursor:grab}.chess-piece[draggable=true]:active{cursor:grabbing}.chess-piece--w{color:#fbfbf7;text-shadow:0 0 1px #1b1b1b,0 1px 2px rgba(0,0,0,.45)}.chess-piece--b{color:#1c1c1c;text-shadow:0 1px 1px rgba(255,255,255,.25)}.chess-side{display:grid;gap:14px;align-content:start}.chess-solution{background:#f1f6f6;border-radius:8px;color:var(--muted);display:grid;gap:8px;margin:0;padding:12px 14px}.chess-solution__moves{align-items:center;color:var(--ink);display:flex;flex-wrap:wrap;gap:7px 10px}.chess-solution__move{align-items:center;display:inline-flex;gap:2px;white-space:nowrap}.chess-solution__move img{height:25px;object-fit:contain;width:25px}.chess-actions{display:grid;gap:10px;grid-template-columns:1fr}@media(max-width:1400px){.chess__layout{grid-template-columns:1fr;justify-items:center}.chess__head,.chess-side{height:auto;overflow:visible;max-width:var(--chess-size);width:100%}}.quiz-start h3{margin:8px 0 6px}.quiz-start p{color:var(--muted);margin:0 0 18px;max-width:520px}.quiz-start .button{min-width:160px}.ranking-modal{max-width:540px}.ranking-modal__head{align-items:flex-end;display:flex;flex-wrap:wrap;gap:12px 16px;justify-content:space-between;padding-right:32px}.ranking-modal__head h2{margin:4px 0 0}.ranking-modal__body{margin-top:18px;max-height:min(60vh,520px);overflow-y:auto;-webkit-overflow-scrolling:touch}.leaderboard{display:grid;gap:8px;list-style:none;margin:0;padding:0}.leaderboard__row{align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);display:grid;gap:12px;grid-template-columns:36px 1fr auto auto;padding:12px 16px}.leaderboard__row.is-me{border-color:var(--teal);box-shadow:0 0 0 2px #0e8f8833}.leaderboard__rank{color:var(--muted);font-weight:900;text-align:center}.leaderboard__row:nth-child(1) .leaderboard__rank{color:var(--gold)}.leaderboard__nick{font-weight:800;min-width:0;overflow-wrap:anywhere}.leaderboard__solved{color:var(--muted);font-size:.85rem;white-space:nowrap}.leaderboard__score{font-weight:900;white-space:nowrap}@media(max-width:520px){.leaderboard__row{gap:10px;grid-template-columns:28px 1fr auto;padding:11px 12px}.leaderboard__solved{display:none}}@media(max-width:760px){.account-menu__dropdown{left:0;right:auto}}.auth-overlay{align-items:center;background:#1018208c;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;inset:0;justify-content:center;padding:20px;position:fixed;z-index:50}.auth-modal{background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);max-width:420px;padding:28px;position:relative;width:100%}.auth-modal h2{margin:18px 0 4px}.auth-close{background:transparent;border:0;color:var(--muted);cursor:pointer;font-size:1.6rem;line-height:1;padding:6px;position:absolute;right:14px;top:14px}.auth-close:hover{color:var(--ink)}.auth-tabs{display:flex;gap:8px}.auth-hint{color:var(--muted);font-size:.9rem;margin:6px 0 0}.auth-form{display:grid;gap:14px;margin-top:18px}.auth-form label{color:var(--graphite);display:grid;font-weight:800;gap:6px;font-size:.9rem}.auth-form input{border:1px solid var(--line);border-radius:8px;font-weight:500;min-height:46px;padding:11px 12px;width:100%}.auth-form input:focus-visible{border-color:var(--teal);outline:none}.auth-form .button{margin-top:4px}.auth-switch{color:var(--muted);font-size:.9rem;margin:16px 0 0;text-align:center}.auth-switch button{background:transparent;border:0;color:var(--teal);cursor:pointer;font:inherit;font-weight:800;padding:0}.auth-switch button:hover{text-decoration:underline}.hero{min-height:calc(100svh - 72px);overflow:hidden;position:relative}.hero__image,.hero__scrim{height:100%;inset:0;position:absolute;width:100%}.hero__image{object-fit:cover;transform-origin:center;animation:hero-ken-burns 32s ease-in-out infinite alternate;will-change:transform}@keyframes hero-ken-burns{0%{transform:scale(1.06) translateZ(0)}to{transform:scale(1.12) translate3d(-1.5%,-1.2%,0)}}@media(prefers-reduced-motion:reduce){.hero__image{animation:none;transform:none}.hero:after{animation:none;opacity:0}}.hero__scrim{background:linear-gradient(90deg,#101820c7,#1018206b 48%,#10182029),linear-gradient(0deg,#fbfaf7f5,#fbfaf700 18%)}.hero__content{color:#fff;max-width:780px;padding:clamp(72px,12vw,144px) clamp(20px,5vw,72px) 132px;position:relative;z-index:2}.hero:after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;background:linear-gradient(105deg,transparent 38%,rgba(255,255,255,.16) 48%,rgba(255,255,255,.04) 56%,transparent 66%);transform:translate(-65%);animation:hero-shine 120s linear infinite}@keyframes hero-shine{0%{transform:translate(-65%);opacity:0}0.5%{opacity:1}4%{transform:translate(65%);opacity:1}5%{transform:translate(65%);opacity:0}to{transform:translate(65%);opacity:0}}.eyebrow{color:var(--coral);font-size:.78rem;font-weight:850;letter-spacing:0;margin:0 0 12px;text-transform:uppercase}.hero .eyebrow{color:#ffd36b}h1,h2,p{margin-top:0}h1{font-size:clamp(3rem,10vw,7rem);letter-spacing:0;line-height:.92;margin-bottom:22px}h2{font-size:clamp(2rem,5vw,3.7rem);letter-spacing:0;line-height:1;margin-bottom:16px}.hero__lead,.section p{color:#ffffffdb;font-size:clamp(1.05rem,2vw,1.28rem);line-height:1.65;max-width:680px}.section p{color:var(--muted)}.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}.button,.chip{align-items:center;border:0;border-radius:8px;cursor:pointer;display:inline-flex;font-weight:800;justify-content:center;min-height:44px;padding:12px 18px;transition:transform .18s ease,background .18s ease,box-shadow .18s ease}.button{background:#eef4f4;color:var(--graphite)}.button:hover,.chip:hover{transform:translateY(-1px)}.button:disabled,.chip:disabled{cursor:not-allowed;opacity:.58;transform:none}.button--primary{background:var(--gold);color:#171717;box-shadow:0 14px 34px #e4ad3252}.button--ghost{background:#ffffff24;border:1px solid rgba(255,255,255,.42);color:#fff}.button--secondary{background:var(--graphite);color:#fff}.stats-band{display:grid;gap:1px;grid-template-columns:repeat(3,1fr);margin-top:-64px;padding:0 clamp(16px,4vw,56px);position:relative;z-index:2}.stats-band article{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);min-height:116px;padding:24px}.stats-band article:first-child{border-radius:8px 0 0 8px}.stats-band article:last-child{border-radius:0 8px 8px 0}.stats-band span{color:var(--teal-dark);display:block;font-size:2.1rem;font-weight:900;line-height:1}.stats-band p{color:var(--muted);margin:8px 0 0}.section{padding:clamp(44px,6vw,76px) clamp(18px,4vw,56px)}.section__header{max-width:820px}.toolbar{display:flex;flex-wrap:wrap;gap:10px;margin:30px 0}.subcategory-bar{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 0}.quiz-control-group{margin-top:22px}.quiz-control-group .subcategory-bar{margin-top:8px}.quiz-mobile-filters{display:none}.control-label{color:var(--graphite);font-size:.78rem;font-weight:900;margin:0;text-transform:uppercase}.chip{background:#e9efef;color:var(--graphite)}.chip.is-active{background:var(--teal);color:#fff}.puzzle-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.card,.wide-card,.quiz-panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}.card{display:flex;flex-direction:column;min-height:430px;min-width:0;padding:22px}.card__top{align-items:center;display:flex;justify-content:space-between;gap:12px}.tag{border-radius:999px;color:#fff;font-size:.78rem;font-weight:850;padding:6px 10px}.tag--rebus{background:var(--teal)}.tag--riddle{background:var(--coral)}.tag--quiz{background:var(--gold);color:#1d1d1d}.difficulty{color:var(--muted);font-size:.88rem;font-weight:760}.rebus-art{align-items:center;background:radial-gradient(circle at 20% 18%,rgba(228,173,50,.2),transparent 34%),linear-gradient(135deg,#eef8f7,#fff7ec);border:1px solid #dbe9e9;border-radius:8px;display:grid;font-size:clamp(1.5rem,3.2vw,2.6rem);font-weight:900;line-height:1.15;margin:18px 0;min-height:150px;min-width:0;overflow-wrap:anywhere;word-break:break-word;padding:22px;text-align:center}.card h3{font-size:1.28rem;line-height:1.2;margin:0 0 10px}.card p{color:var(--muted);line-height:1.55}.answer-row{display:grid;gap:10px;margin-top:auto}.answer-row input{border:1px solid var(--line);border-radius:8px;min-height:46px;padding:11px 12px;width:100%}.card-actions{display:grid;gap:8px;grid-template-columns:1fr 1fr}.feedback{min-height:28px;margin:12px 0 0}.feedback.is-good{color:var(--ok);font-weight:850}.feedback.is-bad{color:var(--bad);font-weight:850}.section--split{align-items:center;background:#edf5f4;display:grid;gap:34px;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr)}.feature-list{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}.feature-list span{background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 26px #1f293314;font-weight:850;padding:24px}.wide-card,.quiz-panel{margin-top:24px;padding:clamp(22px,4vw,34px)}.wide-card{align-items:center;display:flex;gap:20px;justify-content:space-between}.wide-card p{color:var(--ink);font-size:clamp(1.25rem,3vw,2rem);font-weight:840;line-height:1.25;margin:0}.quiz-options{display:grid;gap:10px;margin-top:22px}.quiz-options button{background:#f1f6f6;border:1px solid var(--line);border-radius:8px;cursor:pointer;min-height:48px;padding:12px 14px;text-align:left;overflow-wrap:anywhere}.quiz-options button:hover,.quiz-options button:focus-visible{border-color:var(--teal);outline:none}.quiz-options button:disabled{cursor:default;opacity:1}.quiz-options button.is-selected{background:#fff6df;border-color:var(--gold);box-shadow:inset 0 0 0 1px #e4ad326b;color:var(--graphite);font-weight:850}.quiz-options button.is-good{background:#2f8f4e1f;border-color:var(--ok);color:#1f6f3c;font-weight:850}.quiz-options button.is-bad{background:#b8463f1f;border-color:var(--bad);color:var(--bad);font-weight:850}.quiz-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.time-badge{align-items:center;background:#f5f8f8;border:1px solid var(--line);border-radius:8px;color:var(--ink)!important;display:inline-flex;font-weight:850;margin:12px 0 4px;min-height:38px;padding:8px 12px}.quiz-summary h3{font-size:clamp(1.7rem,4vw,2.7rem);line-height:1.05;margin-bottom:10px}.quiz-summary>p{color:var(--muted);line-height:1.6}.quiz-review{display:grid;gap:12px;margin:24px 0}.review-item{border:1px solid var(--line);border-left-width:6px;border-radius:8px;padding:16px}.review-item.is-good{border-left-color:var(--ok);background:#2f8f4e12}.review-item.is-bad{border-left-color:var(--bad);background:#b8463f12}.review-item__meta{color:var(--muted);font-size:.88rem;font-weight:850;margin-bottom:8px}.review-item h4{font-size:1.05rem;margin:0 0 10px}.review-item p{color:var(--ink);line-height:1.45;margin:4px 0}.section--sudoku{background:#fbfaf7}.sudoku-toolbar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}.sudoku-layout{--sudoku-size: clamp(518px, calc(100vw - 880px) , 750px);align-items:start;display:grid;gap:20px;grid-template-columns:432px var(--sudoku-size) 288px;justify-content:center}.sudoku-board{align-self:start;aspect-ratio:1;background:#101820;border:3px solid #101820;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);height:var(--sudoku-size);order:2;width:var(--sudoku-size)}.sudoku-board input{aspect-ratio:auto;background:#fff;border:1px solid #cfd8dc;border-radius:0;color:#101820;font-size:1.25rem;font-weight:700;height:100%;min-width:0;padding:0;text-align:center;width:100%}.sudoku-board input:nth-child(3n){border-right-color:#101820;border-right-width:3px}.sudoku-board input:nth-child(9n){border-right-width:0}.sudoku-board input:nth-child(n+19):nth-child(-n+27),.sudoku-board input:nth-child(n+46):nth-child(-n+54){border-bottom-color:#101820;border-bottom-width:3px}.sudoku-board input.is-fixed{background:#eef3f5;color:#2f3b45}.sudoku-board input:focus{background:#fff7d6;outline:2px solid #0ea5a4;outline-offset:-2px}.sudoku-board input.is-active{background:#fff7d6;outline:2px solid #0ea5a4;outline-offset:-2px}.sudoku-board input.is-hint{background:#e6f6ec;color:#12914f;font-weight:900}.sudoku-card{background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 16px 36px #1018200f;padding:18px;width:100%}.sudoku-card--input,.sudoku-card--settings{height:var(--sudoku-size)}.sudoku-card--input{order:3}.sudoku-card--settings{align-self:stretch;display:flex;flex-direction:column;order:1}.sudoku-side__label{color:var(--graphite);font-size:.78rem;font-weight:900;letter-spacing:0;margin:0 0 10px;text-transform:uppercase}.sudoku-card p{color:var(--muted);line-height:1.6;margin:0}.sudoku-card .chip{flex:1 1 100%;min-width:0}.sudoku-meta{background:#f5f8f8;border:1px solid var(--line);border-radius:8px;display:flex;gap:12px;justify-content:space-between;margin-bottom:16px;padding:12px 14px}.sudoku-meta span,.sudoku-meta strong{font-size:.95rem}.sudoku-card--settings>.sudoku-meta:not(.sudoku-meta--time){display:none}.sudoku-meta--time{margin-top:0}.sudoku-settings-actions{border-top:1px solid var(--line);margin-top:auto;padding-top:18px}.sudoku-card--settings>p{margin-bottom:18px}.sudoku-keypad{display:grid;gap:8px;grid-template-columns:repeat(3,1fr);margin-top:12px}.sudoku-keypad button{background:#f1f6f6;border:1px solid var(--line);border-radius:8px;color:var(--ink);cursor:pointer;font-size:1rem;font-weight:850;min-height:42px}.sudoku-keypad button:hover{border-color:var(--teal)}.sudoku-keypad__clear{grid-column:1 / -1}.sudoku-keypad__undo{display:none}.sudoku-keypad button:disabled{cursor:default;opacity:.45}.sudoku-clear-all{margin-top:10px;width:100%}.sudoku-active-cell{align-items:center;background:#f5f8f8;border:1px solid var(--line);border-radius:8px;color:var(--ink);display:flex;font-size:.85rem;font-weight:750;gap:10px;line-height:1.25;text-align:left;height:84px;margin:0;overflow:hidden;padding:10px 12px}.sudoku-active-cell__icon{align-items:center;background:#e1e8ea;border-radius:50%;color:var(--muted);display:flex;flex:0 0 auto;font-size:.9rem;font-weight:900;height:26px;justify-content:center;width:26px}.sudoku-active-cell__text{min-width:0}.sudoku-active-cell.is-good{background:#e8f7ef;border-color:#bfe6cf;color:#17633a}.sudoku-active-cell.is-good .sudoku-active-cell__icon{background:#c7ecd6;color:#17633a}.sudoku-active-cell.is-bad{background:#fff1f1;border-color:#f3cccc;color:#9f2525}.sudoku-active-cell.is-bad .sudoku-active-cell__icon{background:#f7d6d6;color:#9f2525}.sudoku-actions{display:grid;gap:10px;grid-template-columns:1fr;margin-top:0}.sudoku-actions .button{min-width:0;padding-inline:16px;width:100%}.footer{border-top:1px solid var(--line);color:var(--muted);padding:28px clamp(18px,4vw,56px)}.footer p{margin:0}@media(max-width:1400px){.sudoku-layout{--sudoku-size: min(750px, calc(100vw - 36px) 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