:root{color-scheme:light;--bg:#f7f8fa;--surface:#fff;--surface-2:#f1f3f6;--ink:#10131a;--ink-2:#3d4552;--muted:#6b7482;--line:#e4e7ec;--line-2:#d3d8e0;--brand:#2563eb;--brand-ink:#1d4ed8;--brand-soft:#eff4ff;--accent:#7c3aed;--accent-soft:#f5f1ff;--ok:#15803d;--ok-soft:#f0fdf4;--warn:#b45309;--danger:#b91c1c;--danger-soft:#fef2f2;--radius:12px;--radius-sm:8px;--shadow-sm:0 1px 2px #10131a0f;--shadow:0 4px 16px #10131a12;--max:1160px;--font:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--mono:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:15px;line-height:1.7}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}[hidden]{display:none!important}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{z-index:100;background:var(--brand);color:#fff;border-radius:var(--radius-sm);padding:.55rem 1rem;font-size:.85rem;font-weight:600;position:fixed;top:-4rem;left:1rem}.skip-link:focus{top:1rem}:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.site-header{z-index:50;backdrop-filter:blur(10px);border-bottom:1px solid var(--line);background:#ffffffe0;position:sticky;top:0}.site-header .bar{max-width:var(--max);align-items:center;gap:20px;min-height:60px;margin-inline:auto;padding:0 20px;display:flex}.brand{letter-spacing:-.01em;align-items:center;gap:9px;font-weight:700;display:inline-flex}.brand-mark{background:linear-gradient(135deg, var(--brand), var(--accent));color:#fff;border-radius:8px;flex:none;place-items:center;width:28px;height:28px;font-size:.8rem;font-weight:800;display:grid}.brand-name{font-size:1rem}.site-header nav{align-items:center;gap:2px;margin-left:auto;font-size:.88rem;display:flex}.site-header nav a{border-radius:var(--radius-sm);color:var(--ink-2);padding:7px 12px;font-weight:500}.site-header nav a:hover{background:var(--surface-2);color:var(--ink)}.site-header nav a[aria-current=page]{background:var(--brand-soft);color:var(--brand-ink);font-weight:600}.menu-button{border:1px solid var(--line);background:var(--surface);border-radius:var(--radius-sm);width:38px;height:38px;color:var(--ink-2);justify-content:center;align-items:center;margin-left:auto;display:none}.menu-close,.menu-button[aria-expanded=true] .menu-open{display:none}.menu-button[aria-expanded=true] .menu-close{display:block}main{min-height:60vh;display:block}.wrap{max-width:var(--max);margin-inline:auto;padding-inline:20px}.hero{text-align:center;padding-block:60px 40px}.hero h1{letter-spacing:-.025em;margin:0 0 14px;font-size:clamp(1.85rem,4.2vw,2.9rem);font-weight:800;line-height:1.2}.hero .lead{max-width:620px;color:var(--muted);margin:0 auto;font-size:1rem}.hero-badges{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:22px;display:flex}.hero-badges span{background:var(--surface);border:1px solid var(--line);color:var(--ink-2);border-radius:999px;align-items:center;gap:6px;padding:5px 11px;font-size:.78rem;font-weight:500;display:inline-flex}.hero-badges svg{color:var(--ok)}.search-bar{max-width:560px;margin:28px auto 0;position:relative}.search-bar svg{color:var(--muted);pointer-events:none;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.search-bar input[type=search]{border:1px solid var(--line-2);background:var(--surface);width:100%;height:48px;box-shadow:var(--shadow-sm);border-radius:999px;padding:0 44px;font-size:.95rem}.search-bar input[type=search]::placeholder{color:var(--muted)}.search-bar input[type=search]:focus{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft);outline:none}.search-clear{width:32px;height:32px;color:var(--muted);background:0 0;border:0;border-radius:50%;place-items:center;display:grid;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.search-clear:hover{background:var(--surface-2);color:var(--ink)}.tool-section{padding-block:12px 40px}.section-head{justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:18px;display:flex}.section-head h2{letter-spacing:-.01em;margin:0;font-size:1.05rem}.section-head p{color:var(--muted);margin:0;font-size:.85rem}.tool-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin:0;padding:0;list-style:none;display:grid}.tool-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);height:100%;box-shadow:var(--shadow-sm);flex-direction:column;padding:18px;transition:transform .16s,box-shadow .16s,border-color .16s;display:flex}.tool-card:hover{box-shadow:var(--shadow);border-color:var(--line-2);transform:translateY(-2px)}.tool-card .icon{background:var(--brand-soft);width:38px;height:38px;color:var(--brand-ink);border-radius:10px;flex:none;place-items:center;margin-bottom:12px;display:grid}.tool-card h3{letter-spacing:-.01em;margin:0 0 6px;font-size:.98rem}.tool-card p{color:var(--muted);margin:0;font-size:.84rem;line-height:1.65}.tool-card .meta{color:var(--muted);align-items:center;gap:8px;margin-top:auto;padding-top:12px;font-size:.74rem;display:flex}.tool-card .meta .dot{background:var(--line-2);border-radius:50%;width:3px;height:3px}.empty-state{text-align:center;color:var(--muted);border:1px dashed var(--line-2);border-radius:var(--radius);background:var(--surface);padding:48px 24px}.empty-state strong{color:var(--ink);margin-bottom:6px;font-size:1rem;display:block}.tool-page{padding-block:28px 64px}.breadcrumb{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:20px;font-size:.82rem;display:flex}.breadcrumb a:hover{color:var(--brand)}.breadcrumb .sep{color:var(--line-2)}.tool-header{align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.tool-header .icon{background:var(--brand-soft);width:46px;height:46px;color:var(--brand-ink);border-radius:12px;flex:none;place-items:center;display:grid}.tool-header h1{letter-spacing:-.02em;margin:0 0 6px;font-size:clamp(1.4rem,3vw,1.9rem)}.tool-header p{color:var(--muted);margin:0;font-size:.92rem}.tool-body{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);padding:22px}.tool-note{border-radius:var(--radius-sm);background:var(--ok-soft);color:var(--ok);border:1px solid #bbf7d0;margin-top:16px;padding:12px 14px;font-size:.84rem}.tool-note.error{background:var(--danger-soft);color:var(--danger);border-color:#fecaca}.tool-note.info{background:var(--brand-soft);color:var(--brand-ink);border-color:#c7dbff}.field{margin-bottom:16px}.field:last-child{margin-bottom:0}.field label{color:var(--ink-2);margin-bottom:6px;font-size:.82rem;font-weight:600;display:block}.field .hint{color:var(--muted);margin-top:6px;font-size:.76rem}textarea,input[type=text],input[type=number],input[type=search],select{border:1px solid var(--line-2);border-radius:var(--radius-sm);background:var(--surface);width:100%;padding:10px 12px;font-size:.9rem}textarea{resize:vertical;min-height:150px;font-family:var(--mono);font-size:.84rem;line-height:1.65}textarea:focus,input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft);outline:none}select{appearance:none;cursor:pointer}.row{flex-wrap:wrap;align-items:flex-end;gap:12px;display:flex}.row>.field{flex:160px;margin-bottom:0}.controls{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.button{border-radius:var(--radius-sm);border:1px solid var(--brand);background:var(--brand);color:#fff;justify-content:center;align-items:center;gap:7px;min-height:40px;padding:0 16px;font-size:.87rem;font-weight:600;display:inline-flex}.button:hover{background:var(--brand-ink);border-color:var(--brand-ink)}.button.secondary{background:var(--surface);color:var(--ink-2);border-color:var(--line-2)}.button.secondary:hover{background:var(--surface-2);color:var(--ink)}.button:disabled{opacity:.5;cursor:not-allowed}.stat-row{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:12px;margin-top:16px;display:grid}.stat{border-radius:var(--radius-sm);background:var(--surface-2);border:1px solid var(--line);padding:12px 14px}.stat dt{color:var(--muted);margin-bottom:2px;font-size:.74rem}.stat dd{letter-spacing:-.01em;margin:0;font-size:1.05rem;font-weight:700}.swatch{border-radius:var(--radius-sm);border:1px solid var(--line-2);width:100%;height:90px}.result-list{gap:6px;margin:14px 0 0;padding:0;list-style:none;display:grid}.result-list li{border-radius:var(--radius-sm);background:var(--surface-2);border:1px solid var(--line);font-family:var(--mono);word-break:break-all;padding:8px 10px;font-size:.82rem}.result-list li .idx{color:var(--muted);margin-right:8px}mark{color:inherit;background:#fde68a;border-radius:2px;padding:0 1px}.kv-table{border-collapse:collapse;width:100%;margin-top:12px;font-size:.85rem}.kv-table th,.kv-table td{text-align:left;border-bottom:1px solid var(--line);padding:9px 10px}.kv-table th{color:var(--muted);font-size:.78rem;font-weight:600}.kv-table td{font-family:var(--mono);font-size:.82rem}.kv-table tr:last-child td{border-bottom:0}.site-footer{border-top:1px solid var(--line);background:var(--surface);margin-top:40px}.site-footer .inner{max-width:var(--max);grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:20px;margin-inline:auto;padding:34px 20px;display:grid}.footer-brand{letter-spacing:-.01em;font-weight:700}.footer-brand:hover{color:var(--brand)}.site-footer p{color:var(--muted);margin:6px 0 0;font-size:.8rem}.footer-links{flex-wrap:wrap;gap:18px;font-size:.82rem;display:flex}.footer-links a{color:var(--muted)}.footer-links a:hover{color:var(--brand)}.copyright{border-top:1px solid var(--line);grid-column:1/-1;padding-top:18px}.prose{max-width:720px}.prose h2{margin:28px 0 10px;font-size:1.05rem}.prose p{color:var(--ink-2);margin:0 0 14px}.prose ul{color:var(--ink-2);padding-left:1.2em}.prose li{margin-bottom:6px}.prose code{background:var(--surface-2);border:1px solid var(--line);font-family:var(--mono);border-radius:4px;padding:2px 5px;font-size:.85em}.game-layout{grid-template-columns:minmax(0,654px) minmax(240px,1fr);align-items:start;gap:20px;display:grid}.game-board-wrap{min-width:0;max-width:654px}.board-shell{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden}.board-statusline{border-bottom:1px solid var(--line);background:var(--surface-2);justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;font-size:.78rem;display:flex}.board-statusline.footer-line{border-bottom:0;border-top:1px solid var(--line)}.board-statusline .tag{color:var(--muted)}.board-statusline .turn{color:var(--brand-ink);font-weight:600}.board-statusline .status{color:var(--muted)}.board-surface{line-height:0;position:relative}#board{aspect-ratio:1;cursor:crosshair;touch-action:manipulation;width:100%;height:auto;display:block}.thinking{color:var(--brand-ink);background:#ffffffc7;justify-content:center;align-items:center;gap:10px;font-size:.85rem;font-weight:600;display:flex;position:absolute;inset:0}.spinner{border:2px solid var(--line-2);border-top-color:var(--brand);border-radius:50%;width:15px;height:15px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.game-panel{gap:14px;display:grid}.panel-block{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);padding:16px}.panel-block h2{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:0 0 12px;font-size:.82rem}.level-picker{gap:7px;display:grid}.level{text-align:left;border:1px solid var(--line-2);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);justify-content:space-between;align-items:baseline;gap:10px;padding:10px 12px;display:flex}.level:hover{background:var(--surface-2)}.level.active{border-color:var(--brand);background:var(--brand-soft)}.level .lv-name{font-size:.88rem;font-weight:600}.level.active .lv-name{color:var(--brand-ink)}.level .lv-note{color:var(--muted);font-size:.74rem}.stat-list{gap:8px;margin:0;display:grid}.stat-list>div{justify-content:space-between;align-items:baseline;gap:12px;display:flex}.stat-list dt{color:var(--muted);font-size:.8rem}.stat-list dd{margin:0;font-size:.88rem;font-weight:700}.panel-actions{grid-template-columns:1fr 1fr;gap:8px;margin-top:14px;display:grid}.ghost-button{border:1px solid var(--line-2);border-radius:var(--radius-sm);background:var(--surface);min-height:40px;color:var(--ink-2);justify-content:center;align-items:center;padding:0 14px;font-size:.85rem;font-weight:600;display:inline-flex}.ghost-button:hover{background:var(--surface-2);color:var(--ink)}.ghost-button.wide{width:100%;margin-top:8px}.rules{color:var(--muted);margin:0;padding-left:1.2em;font-size:.8rem;line-height:1.85}@media (width<=900px){.game-layout{grid-template-columns:1fr}.game-board-wrap{margin-inline:auto}}@media (width<=760px){.site-header .bar{gap:12px;padding-inline:16px}.menu-button{display:inline-flex}.site-header nav{background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:2px;margin-left:0;padding:10px 16px 14px;display:none;position:absolute;top:100%;left:0;right:0}.site-header nav.is-open{display:flex}.site-header nav a{padding:11px 12px}.wrap{padding-inline:16px}.hero{padding-block:40px 28px}.tool-grid{grid-template-columns:1fr}.tool-body{padding:16px}.site-footer .inner{grid-template-columns:1fr;padding:26px 16px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}