:root{--bg-primary: #121212;--bg-secondary: #1e1e1e;--bg-tertiary: #252525;--text-primary: #e0e0e0;--text-secondary: #a0a0a0;--border-color: #333;--accent: #0d9488;--accent-light: #14b8a6;--accent-rgb: 13, 148, 136;--accent-contrast: #ffffff;--puzzle-accent: #8b5cf6;--success: #059669;--warning: #d97706;--error: #dc2626;--board-light: #d9c39a;--board-dark: #8a6a44;--board-highlight: rgba(var(--accent-rgb), .35);--board-selected: rgba(255, 255, 255, .18);--board-target: rgba(var(--accent-rgb), .45)}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f8fafc;--bg-tertiary: #f1f5f9;--text-primary: #1e293b;--text-secondary: #64748b;--border-color: #e2e8f0;--accent: #0d9488;--accent-light: #14b8a6;--accent-rgb: 13, 148, 136;--accent-contrast: #ffffff;--puzzle-accent: #7c3aed;--board-light: #f1e3c2;--board-dark: #c2965a;--board-highlight: rgba(var(--accent-rgb), .28);--board-selected: rgba(0, 0, 0, .1);--board-target: rgba(var(--accent-rgb), .32)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.5;min-height:100vh}.container{width:100%;max-width:none;margin:0 auto;padding:1rem 1.5rem}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-light)}.site-header,header{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:1rem;padding:1.2rem 0;border-bottom:1px solid var(--border-color);margin-bottom:2rem}.logo{display:inline-flex;align-items:center;gap:.6rem;font-size:1.4rem;font-weight:800;color:inherit;text-decoration:none;letter-spacing:-.01em}.brand-mark{width:2rem;height:2rem;flex:0 0 auto;border-radius:8px;background:var(--accent);color:var(--accent-contrast);display:inline-flex;align-items:center;justify-content:center;font-size:1.15rem;line-height:1}.controls{display:flex;justify-content:flex-end;gap:.5rem;align-items:center}.site-network{display:flex;justify-content:center;gap:.5rem;flex-wrap:wrap}.site-network-link{color:var(--text-secondary);text-decoration:none;font-size:.9rem;display:inline-flex;align-items:center;min-height:2.25rem;border:1px solid var(--border-color);border-radius:999px;padding:.35rem .7rem;white-space:nowrap}.site-network-link:hover{border-color:var(--accent);color:var(--accent)}.color-picker-wrap{position:relative;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.color-swatch{display:inline-block;width:1.65rem;height:1.65rem;border-radius:50%;background:var(--accent);border:2px solid var(--border-color);transition:border-color .15s,transform .15s}.color-picker-wrap:hover .color-swatch{border-color:var(--accent);transform:scale(1.1)}.color-picker-wrap input[type=color]{position:absolute;inset:0;width:100%;height:100%;opacity:0;padding:0;border:none;cursor:pointer}.color-picker-wrap:focus-within .color-swatch,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.main-grid{display:block;min-height:calc(100vh - 120px)}.sidebar{background:var(--bg-secondary);border-radius:8px;padding:1rem;height:fit-content;position:sticky;top:1rem}.search-box{margin-bottom:1.5rem}.search-box input{width:100%;padding:.5rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary)}.categories{display:flex;flex-direction:column;gap:.5rem}.category{padding:.75rem;border-radius:4px;cursor:pointer;transition:background .2s;display:flex;align-items:center;gap:.5rem}.category:hover{background:var(--bg-tertiary)}.category.active{background:var(--accent);color:#fff}.recent-tools{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border-color)}.recent-tools h4{margin-bottom:.5rem;color:var(--text-secondary);font-size:.875rem}.tool-chip{display:inline-block;background:var(--bg-tertiary);padding:.25rem .5rem;border-radius:4px;margin:.125rem;font-size:.75rem;cursor:pointer}.tool-container{background:var(--bg-secondary);border-radius:8px;padding:1.5rem}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.tool-title{display:flex;align-items:center;gap:.5rem;font-size:1.25rem}.tool-title h1{font-size:1.5rem;line-height:1.2}.tool-description{color:var(--text-secondary);margin-bottom:1.5rem;font-size:.95rem}.tool-actions{display:flex;gap:.5rem}.btn{padding:.5rem 1rem;border:none;border-radius:4px;cursor:pointer;display:inline-flex;align-items:center;gap:.5rem;font-size:.875rem;transition:all .2s}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}.btn:hover{transform:translateY(-1px);box-shadow:0 2px 4px #0003}.btn:disabled{opacity:.55;cursor:not-allowed}.btn:disabled:hover{transform:none;box-shadow:none}@media(prefers-reduced-motion:reduce){.btn{transition:none}.btn:hover{transform:none;box-shadow:none}}.io-container{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}@media(max-width:768px){.io-container{grid-template-columns:1fr}.board-shell{width:100%}}.io-panel{display:flex;flex-direction:column;gap:.5rem}.io-label{display:flex;justify-content:space-between;align-items:center;font-size:.875rem;color:var(--text-secondary)}.stats{font-size:.75rem}textarea{width:100%;min-height:300px;padding:1rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary);font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.875rem;line-height:1.4;resize:vertical}textarea:focus{outline:none;border-color:var(--accent)}.output{background:var(--bg-primary)}.options-panel{background:var(--bg-tertiary);border-radius:4px;padding:1rem;margin-bottom:1rem}.options-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem}.option-group{display:flex;flex-direction:column;gap:.5rem}.option-group label{font-size:.875rem;color:var(--text-secondary)}select,input[type=range],input[type=checkbox],input[type=radio]{padding:.25rem .5rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary)}input[type=checkbox],input[type=radio]{width:auto;cursor:pointer}.status-bar{display:flex;justify-content:space-between;align-items:center;padding-top:1rem;border-top:1px solid var(--border-color);font-size:.75rem;color:var(--text-secondary)}.category-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1rem}.category-header h1{font-size:clamp(1.75rem,4vw,2.75rem);line-height:1.1;margin-bottom:.35rem}.category-header p{color:var(--text-secondary);max-width:680px}.category-nav{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 1rem}.home-category-nav{margin-top:.25rem}.category-chip,.tag{display:inline-flex;align-items:center;gap:.35rem;border:1px solid var(--border-color);border-radius:999px;background:var(--bg-tertiary);color:var(--text-secondary);min-height:2rem;padding:.35rem .75rem;font-size:.8rem;text-decoration:none}.category-chip span{color:var(--accent);font-size:.75rem}.category-chip:hover,.category-chip.active,.tag-link:hover{border-color:var(--accent);color:var(--accent)}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem;margin-top:1rem}.tool-card{display:flex;flex-direction:column;gap:.75rem;background:var(--bg-tertiary);border-radius:8px;padding:1.5rem;transition:all .2s;border:1px solid transparent;color:inherit;min-height:210px}.tool-card:hover{border-color:var(--accent);transform:translateY(-2px)}.tool-card.featured{border-color:rgba(var(--accent-rgb),.35)}.tool-card.queued{opacity:.78;border-style:dashed}.tool-card-link{display:flex;flex:1;flex-direction:column;color:inherit;text-decoration:none}.tool-card-link[aria-disabled=true]{cursor:default}.tool-icon{width:40px;height:40px;background:var(--accent);border-radius:8px;display:flex;align-items:center;justify-content:center;margin-bottom:1rem;color:#fff}.tool-card-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;margin-bottom:.5rem}.tool-card h2{font-size:1.1rem;margin-bottom:0}.tool-card p{font-size:.875rem;color:var(--text-secondary)}.tool-note{margin-top:.75rem;padding-top:.75rem;border-top:1px solid var(--border-color)}.status-badge{flex:0 0 auto;border:1px solid var(--border-color);border-radius:999px;padding:.18rem .45rem;font-size:.68rem;line-height:1.2;text-transform:uppercase;letter-spacing:.04em;color:var(--text-secondary)}.status-badge.ready{border-color:rgba(var(--accent-rgb),.45);color:var(--accent)}.status-badge.queued{border-color:var(--warning);color:var(--warning)}.queue-section{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--border-color)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:1rem;margin-bottom:1rem}.section-heading h2{font-size:1.25rem}.section-heading p{color:var(--text-secondary);font-size:.9rem;max-width:520px}.tool-grid.compact{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.tool-grid.compact .tool-card{min-height:180px;padding:1rem}.queued-tool{display:grid;gap:1rem;max-width:760px}.queued-tool p{color:var(--text-secondary)}.queued-tool .status-badge{justify-self:start}.queued-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:.25rem}.site-footer{margin-top:2rem;padding:1.5rem 0;border-top:1px solid var(--border-color);text-align:center;color:var(--text-secondary);line-height:1.5;font-size:.95rem}.site-footer p{margin:0;text-align:center}.engine-grid{grid-template-columns:minmax(440px,1.3fr) minmax(260px,.9fr);align-items:start}.board-wrapper{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:8px;padding:.75rem;display:flex;flex-direction:column;gap:.5rem}.board-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem}.board-buttons{display:flex;gap:.35rem;flex-wrap:wrap}.board-buttons.compact .btn{padding:.3rem .45rem}.puzzle-top{display:flex;flex-direction:column;gap:.5rem}.puzzle-bar{display:flex;justify-content:space-between;align-items:center;gap:.5rem;flex-wrap:wrap}.puzzle-metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.4rem}.puzzle-metrics.textual{display:flex;flex-wrap:wrap;gap:.35rem 1rem;align-items:center}.puzzle-metrics.textual span{font-size:.95rem}.puzzle-metrics.textual .muted{color:var(--text-secondary)}.puzzle-metrics.textual .accent{color:var(--accent)}.puzzle-moves{display:flex;flex-direction:column;gap:.25rem}.io-label.tight{margin:0}.puzzle-header-panel{padding:.75rem .85rem}.move-list.slim{padding:.5rem;gap:.25rem}.puzzle-info{display:flex;flex-direction:column;gap:.75rem}.puzzle-info-header{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:.75rem}.puzzle-info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.5rem}.pill{padding:.35rem .75rem;border-radius:999px;border:1px solid var(--accent);background:var(--bg-tertiary);color:var(--text-primary)}.pill.engine{border-color:var(--accent);color:var(--accent)}.pill.muted{color:var(--text-secondary)}.engine-chip{padding:.35rem .75rem;border-radius:999px;border:1px solid var(--accent);background:var(--bg-secondary);font-size:.85rem;color:var(--accent)}.engine-chip.ready{color:var(--success);border-color:var(--success)}.engine-chip.busy{color:var(--warning);border-color:var(--warning)}.btn-compact{padding:.35rem .75rem;font-size:.85rem}.chess-board{position:relative;display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1 / 1;width:100%;border:1px solid var(--border-color);border-radius:6px;overflow:hidden;background:var(--bg-primary);user-select:none;touch-action:none}.square{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:0;cursor:pointer;transition:background .15s,box-shadow .15s}.light-square{background:var(--board-light)}.dark-square{background:var(--board-dark)}.piece{width:90%;height:90%;background-size:contain;background-repeat:no-repeat;background-position:center;pointer-events:auto;cursor:grab;touch-action:none}.piece.drag-ghost{position:fixed;pointer-events:none;z-index:9999;transform:translate(-50%,-50%);opacity:.9;cursor:grabbing}.piece.drag-source{opacity:.35}.square.highlight{box-shadow:inset 0 0 0 3px var(--board-highlight)}.square.selected{outline:2px solid var(--accent);outline-offset:-2px;background:linear-gradient(135deg,var(--board-selected),transparent)}.square.target{box-shadow:inset 0 0 0 3px var(--board-target);background:linear-gradient(135deg,var(--board-highlight),transparent)}.chess-board.game-over{filter:brightness(.75);position:relative}.square.mated{box-shadow:inset 0 0 0 3px #dc2626bf,0 0 12px 5px #dc262673;background:linear-gradient(135deg,rgba(220,38,38,.25),transparent)}.board-footer{display:flex;justify-content:space-between;gap:.5rem;flex-wrap:wrap;font-size:.9rem}.color-pill{padding:.25rem .75rem;border-radius:999px;background:var(--bg-secondary);border:1px solid var(--border-color)}.color-pill.engine{border-color:var(--accent);color:var(--accent)}.move-list{display:flex;flex-wrap:wrap;gap:.35rem;padding:.75rem;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:6px;min-height:64px}.move-tag{padding:.25rem .6rem;background:var(--bg-secondary);border:1px solid var(--accent);border-radius:4px;cursor:pointer;font-size:.85rem;transition:border .2s,transform .2s;color:var(--accent)}.move-tag:hover{border-color:var(--accent-light);background:var(--bg-tertiary);color:var(--accent-light);transform:translateY(-1px)}.move-tag.active{background:var(--accent);border-color:var(--accent);color:#fff}.move-tag.puzzle-segment{border-color:var(--puzzle-accent);color:var(--puzzle-accent)}.move-tag.puzzle-segment:hover{border-color:var(--puzzle-accent);background:#8b5cf624;color:var(--puzzle-accent)}.pgn-panel{display:flex;flex-direction:column;gap:.5rem}.pgn-actions{display:flex;gap:.5rem;flex-wrap:wrap}.engine-log{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:6px;padding:.75rem;min-height:80px;max-height:200px;overflow-y:auto;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.85rem}.engine-log-entry{margin-bottom:.35rem;color:var(--text-secondary)}.engine-log-entry:last-child{margin-bottom:0}.piece[data-piece=wP]{background-image:url(/img/merida/wP.svg)}.piece[data-piece=wN]{background-image:url(/img/merida/wN.svg)}.piece[data-piece=wB]{background-image:url(/img/merida/wB.svg)}.piece[data-piece=wR]{background-image:url(/img/merida/wR.svg)}.piece[data-piece=wQ]{background-image:url(/img/merida/wQ.svg)}.piece[data-piece=wK]{background-image:url(/img/merida/wK.svg)}.piece[data-piece=bP]{background-image:url(/img/merida/bP.svg)}.piece[data-piece=bN]{background-image:url(/img/merida/bN.svg)}.piece[data-piece=bB]{background-image:url(/img/merida/bB.svg)}.piece[data-piece=bR]{background-image:url(/img/merida/bR.svg)}.piece[data-piece=bQ]{background-image:url(/img/merida/bQ.svg)}.piece[data-piece=bK]{background-image:url(/img/merida/bK.svg)}.board-shell{display:flex;flex-direction:column;gap:6px;align-items:center;width:min(100%,640px);margin:0 auto}.board-mid{display:flex;width:100%;gap:6px;align-items:stretch}.board-files{display:grid;grid-template-columns:repeat(8,1fr);width:100%;text-align:center;color:var(--text-secondary);font-size:.85rem;letter-spacing:.5px}.board-ranks{display:grid;grid-template-rows:repeat(8,1fr);gap:2px;width:26px;text-align:center;color:var(--text-secondary);font-size:.85rem}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.success{color:var(--success)}.warning{color:var(--warning)}.error{color:var(--error)}@media(max-width:768px){.main-grid{grid-template-columns:1fr}.sidebar{position:static}.tool-header{flex-direction:column;gap:1rem;align-items:flex-start}.category-header{flex-direction:column}.site-network{justify-content:stretch;align-items:stretch}.site-network-link{justify-content:center}.site-header,header{grid-template-columns:1fr;align-items:stretch}.controls{justify-content:space-between}}.io-container.puzzle-grid{align-items:flex-start}