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16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--maxw: 1440px}[data-theme=dark]{--bg: #0f131b;--bg-elevated: #161c27;--surface: #161c27;--surface-muted: #1d2533;--border: #283042;--border-strong: #38445c;--text: #eef1f7;--text-muted: #a3adbf;--text-faint: #6f7a8d;--accent: #5b8cff;--accent-strong: #7aa2ff;--accent-soft: #1d2942;--accent-contrast: #0b0f17;--success: #4ade80;--success-soft: #14301f;--danger: #f87171;--danger-soft: #3a1d1d;--warning: #fbbf24;--cell-bg: #1b2230;--cell-text: #eef1f7;--cell-border: #313b50;--cell-block: #0b0f17;--cell-clue-bg: #0b0f17;--cell-clue-text: #c9d2e3;--cell-related: #232f47;--cell-given: #202a3c;--cell-conflict: #45222a;--cell-hint: #1c3a2a;--board-line: #0b0f17;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 6px 20px rgba(0, 0, 0, .45);--shadow-lg: 0 20px 50px rgba(0, 0, 0, .6)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);color:var(--text);background:var(--bg);line-height:1.5;transition:background-color .2s ease,color .2s ease}h1,h2,h3,h4{line-height:1.2;margin:0 0 var(--space-3);font-weight:700;letter-spacing:-.01em}p{margin:0 0 var(--space-3)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button,select,input{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:42px;padding:0 var(--space-4);border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font-weight:600;cursor:pointer;transition:background-color .15s ease,border-color .15s ease,transform .05s ease,box-shadow .15s 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var(--border-strong);background:var(--surface);cursor:pointer;position:relative}.nav-toggle__bars,.nav-toggle__bars:before,.nav-toggle__bars:after{position:absolute;left:50%;width:18px;height:2px;background:var(--text);transform:translate(-50%);content:""}.nav-toggle__bars{top:50%;transform:translate(-50%,-50%)}.nav-toggle__bars:before{top:-6px}.nav-toggle__bars:after{top:6px}.page{max-width:var(--maxw);margin:0 auto;padding:var(--space-4) var(--space-4) var(--space-7)}.page-head{margin-bottom:var(--space-5)}.page-head__title{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:var(--space-1)}.page-head__subtitle{color:var(--text-muted);margin:0}.game-toolbar{display:flex;flex-wrap:wrap;align-items:flex-end;gap:var(--space-3);padding:var(--space-4);margin-bottom:var(--space-5)}.game-toolbar__group{display:flex;align-items:flex-end;gap:var(--space-3);flex-wrap:wrap}.game-toolbar__spacer{margin-inline-start:auto}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;grid-template-areas:"board controls" "info controls";column-gap:var(--space-5);row-gap:var(--space-3);align-items:start}.board-panel{grid-area:board;display:flex;flex-direction:column;gap:var(--space-2);min-width:0}.board-controls{align-self:center;display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);width:100%;flex-wrap:nowrap}.board-controls__selectors{display:flex;align-items:center;gap:var(--space-2);min-width:0;flex:0 1 auto}.board-controls select{flex:0 0 auto;min-width:0;width:auto;max-width:none;padding-inline:var(--space-2) 28px}.board-controls__meta,.board-meta{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-2);flex:0 0 auto;flex-wrap:nowrap;margin-inline-start:auto}.board-controls__meta:empty{min-height:42px}.timer{display:inline-flex;align-items:baseline;padding:var(--space-2) var(--space-3);border-radius:var(--radius-pill);background:var(--surface);border:1px solid var(--border);font-variant-numeric:tabular-nums;white-space:nowrap;flex:none}.timer__value{font-size:1.3rem;font-weight:700;letter-spacing:.02em}.status-banner{padding:var(--space-3) var(--space-4);border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface-muted);font-weight:600}.status-banner--success{background:var(--success-soft);border-color:var(--success);color:var(--success)}.status-banner--error{background:var(--danger-soft);border-color:var(--danger);color:var(--danger)}.board-frame{display:grid;place-items:center;position:relative}.board-paused{display:grid;place-items:center;gap:var(--space-3);min-height:280px;width:100%;color:var(--text-muted);text-align:center}.board-paused__icon{font-size:2.5rem}.game-sidebar{grid-area:controls;display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-3);position:sticky;top:84px}.game-sidebar 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ease}.number-pad__btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.number-pad__btn:active:not(:disabled){transform:translateY(1px)}.number-pad__btn:disabled{opacity:.4;cursor:not-allowed}.number-pad__btn.is-exhausted{color:var(--text-faint);background:var(--surface-muted)}.number-pad__count{position:absolute;top:4px;inset-inline-end:6px;font-size:.7rem;font-weight:600;color:var(--text-faint)}.toggle{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:6px var(--space-3);border:1px solid transparent;border-radius:var(--radius-sm);background:var(--surface-muted);cursor:pointer;font-weight:600}.toggle input{inline-size:18px;block-size:18px;accent-color:var(--accent)}.action-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}.action-grid .btn{width:100%}.sidebar-divider{height:1px;background:var(--border);margin:0}.kakuro-board{display:grid;width:100%;max-width:640px;border:3px solid var(--board-line);border-radius:6px;background:var(--board-line);gap:1px;overflow:hidden;touch-action:manipulation}.kakuro-board.is-readonly .cell-empty{cursor:default}.cell{container-type:inline-size;aspect-ratio:1 / 1;min-width:0;position:relative;overflow:hidden;font-variant-numeric:tabular-nums}.cell-block{background:var(--cell-block);border:none;padding:0}.cell-clue{background:var(--cell-clue-bg);color:var(--cell-clue-text);border:none;padding:0}.cell-clue.has-clue:after{content:"";position:absolute;inset:0;background:linear-gradient(to top right,transparent calc(50% - .6px),var(--cell-clue-text) 50%,transparent calc(50% + .6px));opacity:.55;pointer-events:none}.cell-empty{display:grid;place-items:center;width:100%;height:100%;padding:0;border:none;border-radius:0;background:var(--cell-bg);color:var(--cell-text);cursor:pointer;line-height:1;transition:background-color .1s 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var(--border);padding-top:var(--space-4)}.game-info__inner{max-width:720px}.game-info__eyebrow{margin:0 0 var(--space-2);color:var(--accent-strong);font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.game-info__title{margin:0;color:var(--text);font-size:clamp(1.45rem,3vw,2rem);line-height:1.15}.game-info__grid{display:grid;grid-template-columns:1fr;gap:var(--space-4);margin-top:var(--space-4);color:var(--text-muted);line-height:1.7}.game-info__grid p{margin:0}.game-info__grid strong{color:var(--text);font-weight:800}.game-info__subhead{margin:var(--space-6) 0 var(--space-2);font-size:clamp(1.25rem,2vw,1.6rem)}.game-info__summary{max-width:820px;margin:0;color:var(--text-muted);line-height:1.7}.game-info__basics{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:var(--space-3);margin-top:var(--space-4)}.game-info-aid{display:grid;grid-template-columns:56px 1fr;gap:var(--space-3);align-items:start;padding:var(--space-3);border:1px solid 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.7px));opacity:.72}.game-info-aid__clue-right,.game-info-aid__clue-down{position:absolute;z-index:1;font-size:.8rem;font-weight:800;line-height:1}.game-info-aid__clue-right{top:8px;right:7px}.game-info-aid__clue-down{bottom:7px;left:8px}.game-info-aid__visual--run{display:grid;grid-template-columns:repeat(3,1fr);border-width:1px;gap:1px;background:var(--board-line)}.game-info-aid__visual--run span{background:var(--cell-bg)}.game-info-aid__visual--cell{display:grid;place-items:center;color:var(--cell-text);font-size:1.55rem;font-weight:800}.game-info__howto{margin-top:var(--space-4);color:var(--text-muted);line-height:1.7}.game-info__howto h2{margin:0 0 var(--space-2);color:var(--text);font-size:1.15rem}.game-info__howto p{margin:0 0 var(--space-3)}.game-info__howto ul{margin:0 0 var(--space-3);padding-inline-start:var(--space-5)}.sitemap-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-4)}.sitemap-group{border:1px solid 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var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);animation:pop-in .18s ease}.modal--celebrate{text-align:center}.modal__header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border)}.modal__title{margin:0;font-size:1.25rem}.modal__close{width:36px;height:36px;border-radius:var(--radius-sm);border:none;background:var(--surface-muted);font-size:1.4rem;line-height:1;cursor:pointer}.modal__close:hover{color:var(--danger)}.modal__body{padding:var(--space-5)}.modal__footer{display:flex;justify-content:flex-end;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-top:1px solid var(--border)}@keyframes fade-in{0%{opacity:0}}@keyframes pop-in{0%{opacity:0;transform:translateY(8px) scale(.98)}}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-4);text-align:start}.stats-grid--single{grid-template-columns:minmax(260px,460px);justify-content:start}.stats-card{border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-4);background:var(--surface-muted)}.stats-card--wide{grid-column:1 / -1}.stats-card__title{font-size:1rem;margin-bottom:var(--space-3);color:var(--text-muted)}.stats-list{margin:0;display:flex;flex-direction:column;gap:2px}.stat{display:flex;align-items:baseline;justify-content:space-between;gap:var(--space-3);padding:var(--space-2);border-radius:var(--radius-sm)}.stat:nth-child(2n){background:color-mix(in srgb,var(--surface) 58%,var(--surface-muted))}.stat__label{color:var(--text-muted);font-size:.9rem}.stat__value{margin:0;font-weight:700;font-variant-numeric:tabular-nums}.stats-table-wrap{overflow-x:auto}.stats-table{width:100%;border-collapse:collapse;min-width:680px;font-size:.92rem}.stats-table th,.stats-table td{padding:var(--space-2);border-bottom:1px solid var(--border);text-align:start}.stats-table th{color:var(--text-muted);font-weight:700}.stats-popup{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;background:var(--bg)}.stats-popup__body{width:100%;max-width:var(--maxw);margin:0 auto;padding:var(--space-5);display:flex;flex-direction:column;gap:var(--space-5)}.stats-popup__header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.stats-popup__header h1{margin:0;font-size:clamp(1.4rem,3vw,2rem)}.stats-popup__close{display:none;width:40px;height:40px;place-items:center;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font-size:1.2rem;font-weight:800;line-height:1;cursor:pointer}.stats-popup__filters{display:flex;flex-wrap:wrap;gap:var(--space-3);padding:var(--space-4);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.stats-popup__filters .select-control{flex:1 1 180px;min-width:160px}.stats-popup__filters select{width:100%}.stats-share{display:flex;justify-content:center}.stats-share__inner{display:inline-flex;flex-direction:column;align-items:center;gap:var(--space-2)}.stats-share__toggle{min-width:140px}.stats-share__actions{display:flex;gap:var(--space-2);align-items:center;justify-content:center}.stats-share__actions a{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface)}.stats-share__actions a:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none}.stats-share__actions img{width:22px;height:22px;object-fit:contain;display:block}.stats-popup__loading{display:grid;place-items:center;gap:var(--space-3);padding:var(--space-7) 0;color:var(--text-muted)}.stats-popup__loading p{margin:0}.victory{display:flex;flex-direction:column;gap:var(--space-4);align-items:center}.victory__badge{width:72px;height:72px;display:grid;place-items:center;border-radius:50%;background:var(--accent-soft);color:var(--accent);font-size:2.2rem}.victory__subtitle{margin:0;color:var(--text-muted)}.victory__highlights{display:flex;gap:var(--space-4);flex-wrap:wrap;justify-content:center}.victory__highlight{min-width:110px;padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);background:var(--surface-muted);display:flex;flex-direction:column;gap:2px}.victory__highlight-value{font-size:1.5rem;font-weight:800;font-variant-numeric:tabular-nums}.victory__highlight-label{font-size:.78rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:var(--space-6);align-items:center;padding:var(--space-7) var(--space-4);max-width:var(--maxw);margin:0 auto}.hero__eyebrow{display:inline-block;margin-bottom:var(--space-3)}.hero__title{font-size:clamp(2rem,5vw,3.25rem);margin-bottom:var(--space-4)}.hero__subtitle{font-size:1.1rem;color:var(--text-muted);max-width:46ch;margin-bottom:var(--space-5)}.hero__actions{display:flex;flex-wrap:wrap;gap:var(--space-3)}.hero__art{display:grid;place-items:center}.hero__art .kakuro-board{max-width:360px;box-shadow:var(--shadow-md)}.section{max-width:var(--maxw);margin:0 auto;padding:var(--space-6) var(--space-4)}.section__title{font-size:clamp(1.4rem,3vw,1.9rem);margin-bottom:var(--space-2)}.section__lead{color:var(--text-muted);max-width:60ch;margin-bottom:var(--space-5)}.quickstart-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:var(--space-4)}.difficulty-card{display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-4);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);text-align:start;cursor:pointer;transition:border-color .15s ease,transform .1s ease,box-shadow .15s ease}.difficulty-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-md)}.difficulty-card__name{font-size:1.15rem;font-weight:700}.difficulty-card__desc{color:var(--text-muted);font-size:.92rem}.difficulty-card__meter{display:flex;gap:4px;margin-top:auto}.difficulty-card__pip{height:6px;flex:1;border-radius:var(--radius-pill);background:var(--border-strong)}.difficulty-card__pip.is-on{background:var(--accent)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-4)}.feature-card{padding:var(--space-5);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}.feature-card__icon{font-size:1.6rem;margin-bottom:var(--space-2)}.feature-card__title{font-size:1.1rem;margin-bottom:var(--space-1)}.feature-card__text{color:var(--text-muted);margin:0}.prose{max-width:72ch}.prose h2{font-size:1.4rem;margin-top:var(--space-6)}.prose h3{font-size:1.1rem;margin-top:var(--space-5)}.prose ul,.prose ol{padding-inline-start:1.3em;margin:0 0 var(--space-4)}.prose li{margin-bottom:var(--space-2)}.callout{padding:var(--space-4);border-radius:var(--radius-md);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);margin:var(--space-4) 0}.solver-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:var(--space-5);align-items:start}.solver-controls{display:flex;flex-direction:column;gap:var(--space-4);padding:var(--space-4);position:sticky;top:84px}.solver-result{padding:var(--space-3) var(--space-4);border-radius:var(--radius-sm);font-weight:600;border:1px solid var(--border);background:var(--surface-muted)}.solver-result--unique{background:var(--success-soft);border-color:var(--success);color:var(--success)}.solver-result--error{background:var(--danger-soft);border-color:var(--danger);color:var(--danger)}.solver-solution{margin-top:var(--space-6);display:grid;place-items:center;gap:var(--space-3)}.site-footer{border-top:1px solid var(--border);margin-top:var(--space-7);background:var(--bg-elevated)}.site-footer__inner{max-width:var(--maxw);margin:0 auto;padding:var(--space-5) var(--space-4);display:flex;flex-wrap:wrap;gap:var(--space-3);align-items:center;justify-content:space-between;color:var(--text-muted);font-size:.9rem}.site-footer__links{display:flex;gap:var(--space-4)}.site-footer__langs{display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-3);align-items:center;justify-content:flex-end;max-width:760px}.lang-link{color:var(--text-muted);font-size:.9rem;line-height:1.2}.lang-link:hover{color:var(--text);text-decoration:underline}.lang-link.is-active{color:var(--accent-strong);font-weight:700}.settings-list{display:flex;flex-direction:column;gap:var(--space-3)}.settings-row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);cursor:pointer}.settings-row__text{display:flex;flex-direction:column;gap:2px}.settings-row__label{font-weight:600;color:var(--text)}.settings-row__hint{font-size:.85rem;color:var(--text-muted)}.settings-row input[type=checkbox]{width:18px;height:18px;flex:none;accent-color:var(--accent)}.settings-row select{min-width:140px;flex:none}@media(max-width:900px){.game-layout,.solver-layout{grid-template-columns:1fr}.game-layout{grid-template-areas:"board" "controls" "info";row-gap:var(--space-4)}.game-sidebar,.solver-controls{position:static}.game-sidebar{max-width:512px;width:100%;margin:0 auto;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:var(--space-2);padding:0;overflow:hidden}.number-pad{grid-column:1 / -1;grid-template-columns:repeat(9,minmax(0,1fr));gap:0;margin-bottom:var(--space-1)}.number-pad__btn{min-height:44px;aspect-ratio:auto;border-radius:0;font-size:clamp(1.45rem,6vw,2.1rem)}.game-sidebar .action-grid{display:contents}.game-sidebar .btn:not(.btn--primary),.game-sidebar .control-toggle{min-width:0;width:100%;min-height:42px;padding:0;border-radius:0}.game-sidebar .btn--primary{grid-column:1 / -1;margin:var(--space-2)}.control-icon{display:inline-grid;place-items:center;font-size:1.15rem;line-height:1}.control-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.control-toggle{position:relative;justify-content:center;border-color:var(--border-strong);background:var(--surface)}.control-toggle input{position:absolute;opacity:0;pointer-events:none}.control-toggle:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.sidebar-divider{display:none}.game-info{grid-column:auto;margin-top:0}.hero{grid-template-columns:1fr;text-align:center;padding-top:var(--space-6)}.hero__subtitle{margin-inline:auto}.hero__actions{justify-content:center}.hero__art{order:-1}}@media(max-width:720px){.game-page{max-width:none;padding-inline:var(--space-4)}.board-frame{width:100%}.kakuro-board{max-width:min(512px,calc(100vw - 24px))!important}.cell-value{font-size:clamp(14px,76cqw,40px)}.clue-down,.clue-right{font-size:clamp(7px,42cqw,15px)}.board-controls{overflow-x:auto;padding-bottom:2px}.board-controls__selectors{flex:0 0 auto}.board-controls__meta:empty{display:none}.game-sidebar{width:100%;max-width:512px;margin-inline:auto;gap:6px;border-radius:0;box-shadow:none;overflow:visible}.number-pad{width:100vw;margin-inline:calc(50% - 50vw);grid-template-columns:repeat(9,minmax(0,1fr));gap:0;margin-bottom:2px}.number-pad__btn{min-height:clamp(46px,12vw,58px);border-radius:0;font-size:clamp(1.35rem,6vw,2rem)}.game-sidebar .btn:not(.btn--primary),.game-sidebar .control-toggle{min-height:54px}.control-icon{font-size:clamp(1.55rem,6.5vw,2.25rem)}.site-header__inner{flex-wrap:nowrap;gap:var(--space-2);padding-inline:var(--space-2)}.brand{min-width:0;gap:var(--space-2)}.brand__logo{width:34px;height:34px}.brand__name{font-size:1rem;white-space:nowrap}.site-nav{position:static;flex:0 1 auto;margin-inline-start:auto;min-width:0;display:flex;align-items:center;justify-content:flex-end}.site-nav__links{flex-direction:row;flex-wrap:nowrap;gap:2px;white-space:nowrap}.site-nav__link{padding:4px 6px;font-size:.88rem}.site-nav__language{min-height:34px;max-width:92px;font-size:.86rem;padding-inline:6px 22px}.modal__footer{flex-direction:column-reverse}.modal__footer .btn{width:100%}.stats-popup__body{padding:var(--space-4)}.stats-popup__close{display:grid;flex:0 0 auto}}@media(prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}