:root{--ink:#1b2430;--ink-2:#3d4a5a;--muted:#5f6b7a;--line:#e1e6ec;--soft:#f3f6f9;--brand:#2c5d8f;--brand-2:color-mix(in srgb, var(--brand) 10%, #fff);--bad:#b42318;--bg:#f7f9fb;--surface:#fff;--surface-2:var(--soft);--accent:var(--brand);--shadow:0 1px 2px rgba(16, 24, 40, .05), 0 6px 18px rgba(16, 24, 40, .06);--radius:12px;--wrap:1180px;color-scheme:light}*{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%}body{margin:0;font:16.5px/1.65 system-ui,-apple-system,segoe ui,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}a{color:var(--brand)}img,svg{max-width:100%}.wrap{max-width:var(--wrap);margin:0 auto;padding:0 16px}.skip{position:absolute;left:-999px;top:0;background:#fff;padding:8px;z-index:10}.skip:focus{left:8px}.masthead{border-bottom:1px solid var(--line);background:var(--surface);box-shadow:0 1px rgba(16,24,40,2%)}.masthead__in{display:flex;align-items:center;gap:16px;min-height:56px;flex-wrap:wrap}.logo{display:inline-flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);font-size:18.5px;font-weight:650;letter-spacing:-.015em}.logo svg{width:30px;height:30px;flex:none}.logo b{color:var(--brand)}.masthead nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}.masthead nav a{text-decoration:none;color:var(--muted);padding:8px 10px;border-radius:8px;font-size:15px;min-height:40px;display:inline-flex;align-items:center}.masthead nav a:hover{background:var(--soft);color:var(--ink)}.tool-head{padding:26px 0 8px}.tool-head h1{font-size:clamp(26px,4.2vw,38px);line-height:1.15;margin:0 0 8px;letter-spacing:-.025em}.lede{margin:0;color:var(--ink-2);max-width:760px;font-size:17.5px}.tool{margin:14px 0 28px}.tool__static{text-align:center}.tool__static img{width:300px;border:1px solid var(--line);box-shadow:0 2px 10px rgba(20,40,70,8%)}.tool--live{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}.tool__stage{order:-1}@media(min-width:860px){.tool--live{grid-template-columns:330px minmax(0,1fr);align-items:start}.tool__stage{order:0;position:sticky;top:12px}}.tool__panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}.tool__presets{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}.tool__fields{display:grid;gap:10px}.field{display:grid;gap:4px}.field label{font-size:14px;font-weight:600;color:#344150}.field small{color:var(--muted);font-size:13px}.field--check{grid-template-columns:auto 1fr;align-items:center;gap:8px}.field--check label{font-weight:500}.field input[type=checkbox]{width:20px;height:20px;margin:0;accent-color:var(--brand)}select,input[type=number],input[type=text],textarea{font:inherit;font-size:15px;width:100%;min-height:40px;padding:6px 10px;border:1px solid #c5ced8;border-radius:8px;background:#fff;color:var(--ink)}textarea{min-height:80px}input[type=color]{width:56px;height:40px;padding:2px;border:1px solid #c5ced8;border-radius:8px;background:#fff}select:focus,input:focus,textarea:focus,.btn:focus-visible,summary:focus-visible{outline:2px solid var(--brand);outline-offset:1px}.length-custom{display:grid;grid-template-columns:1fr 72px;gap:6px}.tool__more{margin-top:12px;border-top:1px solid var(--line);padding-top:8px}.tool__more summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--brand);padding:8px 0;min-height:40px}.tool__more .tool__fields{padding-top:6px}.tool__preview{background:#e6ebf1;border:1px solid var(--line);border-radius:var(--radius);padding:16px;display:flex;justify-content:center}.tool__preview svg{width:auto;height:auto;max-width:100%;max-height:min(72vh,760px);background:#fff;box-shadow:0 2px 12px rgba(20,40,70,.18);display:block}.tool__info{margin:10px 2px 0;font-size:14px;color:#344150;min-height:1.6em}.tool__info.bad{color:var(--bad);font-weight:600}.tool__actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.tool__tip{font-size:13px;color:var(--muted);margin:8px 2px 0}.btn{font:inherit;font-size:15px;font-weight:600;min-height:42px;padding:8px 16px;border-radius:8px;border:1px solid var(--brand);background:#fff;color:var(--brand);cursor:pointer}.btn:hover{background:var(--brand-2)}.btn.primary{background:var(--brand);color:#fff}.btn.primary:hover{background:#234c75}.btn.ghost{border-color:#c5ced8;color:#344150}.btn.chip{min-height:36px;padding:4px 12px;font-size:14px;font-weight:500;border-color:#c5ced8;color:#344150;border-radius:18px}.btn.chip:hover{border-color:var(--brand);color:var(--brand)}.btn:disabled{opacity:.5;cursor:not-allowed}.guide{max-width:780px;padding-bottom:32px}.guide section{padding:8px 0 6px}.guide section+section{border-top:1px solid var(--line);margin-top:18px;padding-top:22px}.guide h2{font-size:25px;line-height:1.25;margin:10px 0 12px;letter-spacing:-.02em}.guide p,.guide li{color:var(--ink-2)}.guide h3{font-size:18px;margin:18px 0 6px}.guide ol,.guide ul{padding-left:22px}.guide li{margin:4px 0}.guide table{border-collapse:collapse;width:100%;font-size:15px;margin:10px 0;display:block;overflow-x:auto}.guide th,.guide td{border:1px solid var(--line);padding:6px 10px;text-align:left;white-space:nowrap}.guide th{background:var(--soft)}.samples{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;margin:8px 0 4px}.samples figure{margin:0}.samples img{width:100%;height:auto;border:1px solid var(--line);background:#fff;display:block}.samples figcaption{font-size:13px;color:var(--muted);margin-top:4px}.related li{margin:6px 0}.directory{background:var(--surface);border-top:1px solid var(--line);padding:26px 0 30px}.directory h2{font-size:20px;margin:0 0 12px}.dir-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}.dir-grid a{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;min-height:64px;height:100%;transition:border-color .15s,box-shadow .15s,transform .15s}.dir-grid a:hover{border-color:var(--brand);box-shadow:var(--shadow);transform:translateY(-1px)}.dir-grid img{width:44px;height:57px;border:1px solid var(--line);flex:none}.dir-grid b{display:block;font-size:15px}.dir-grid small{color:var(--muted);font-size:13px;line-height:1.35;display:block}.prose{max-width:760px;padding-top:22px;padding-bottom:40px}.prose h1{font-size:30px;line-height:1.25;margin:0 0 6px}.prose h2{font-size:21px;margin:26px 0 8px}.updated{color:var(--muted);font-size:14px;margin-top:0}.prose table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--line);padding:6px 10px;text-align:left}.footer{border-top:1px solid var(--line);background:var(--surface);padding:22px 0 30px;font-size:14px;color:var(--muted);text-align:center}.footer a{color:var(--muted);padding:8px 4px;display:inline-block}.footer__copy{margin:6px 0 0;font-size:13px}.tagline{margin:0;color:var(--muted);font-size:14px}#print-area{display:none}@media print{body>*:not(#print-area){display:none!important}#print-area{display:block}.print-sheet{break-after:page;page-break-after:always;overflow:hidden}.print-sheet:last-child{break-after:auto;page-break-after:auto}.print-sheet svg{display:block;max-width:none}html,body{margin:0;padding:0;background:#fff}}.langs{display:flex;gap:2px;flex-wrap:wrap;font-size:14px}.langs a,.langs span{padding:8px;min-height:40px;display:inline-flex;align-items:center;border-radius:8px;color:var(--muted);text-decoration:none}.langs span{color:var(--ink);font-weight:600}.langs a:hover{background:var(--soft);color:var(--ink)}.masthead nav.langs{margin-left:0}.sd-app-top{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:12px 20px;align-items:flex-end}.sd-app-tabs{display:flex;gap:4px;flex-wrap:wrap}.sd-app-tab{font:inherit;font-size:16px;font-weight:600;min-height:44px;padding:8px 20px;border-radius:10px;border:1px solid #c5ced8;background:#fff;color:var(--ink-2);cursor:pointer}.sd-app-tab:hover{border-color:var(--brand);color:var(--brand)}.sd-app-tab[aria-selected=true]{background:var(--brand);border-color:var(--brand);color:#fff}.sd-app-tab:focus-visible{outline:3px solid var(--brand);outline-offset:2px}.sd-app-type{display:flex;flex-wrap:wrap;gap:10px}.sd-app-type .field{min-width:150px}.sd-app-section{display:contents}.sd-app-stage{position:static;min-width:0}.sd-app-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin:0 auto 8px;max-width:560px}.sd-app-label{font-weight:650;color:var(--ink);margin:0 0 6px}.sd-app-bar .sd-app-label{margin:0}.sd-app-barr{display:inline-flex;align-items:center;gap:8px}.sd-app-timer{font-variant-numeric:tabular-nums;font-weight:650;font-size:18px;color:var(--ink);min-width:3.2em;text-align:right}.sd-app-boardwrap{position:relative}.sd-app-boardhost.is-busy{opacity:.55;pointer-events:none}.sd-app-boardhost.is-paused{visibility:hidden}.sd-app-pause{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:rgba(255,255,255,.9);border-radius:6px;font-weight:650;font-size:20px;max-width:560px;margin:0 auto}.sd-app-pause p{margin:0}.sd-app-pause[hidden]{display:none}.sd-app-notice,.tool__info.bad[role=alert]{margin:0 0 10px}.sd-app-datenav{display:flex;gap:8px}.sd-app-cage{max-width:560px;margin:10px auto 0;font-size:14px;color:var(--ink-2);background:var(--surface-2);border:1px solid var(--line);border-radius:8px;padding:8px 10px;overflow-wrap:anywhere}.sd-app-hint{max-width:560px;margin:12px auto 0;background:#fff8dc;border:1px solid #ecd98a;border-radius:10px;padding:10px 14px;font-size:15px}.sd-app-hint p{margin:4px 0}.sd-app-hint .sd-app-effect{font-weight:650}.sd-app-hint .btn{margin-top:4px}.sd-app-stage>.tool__info,.sd-app-stage>.tool__actions,.sd-app-stage>.tool__tip{max-width:560px;margin-left:auto;margin-right:auto}.sd-app-stage>.tool__actions{margin-top:12px}.sd-app-rating{font-weight:600}.sd-app-progress{display:block;width:100%;max-width:560px;margin:10px auto 0;height:10px;accent-color:var(--brand)}.sd-app-progress[hidden]{display:none}.sd-app-previewbox{padding:12px}.sd-app-sheetprev{width:100%;max-width:520px;background:#fff;box-shadow:0 2px 12px rgba(20,40,70,.18);line-height:0}.sd-app-sheetprev.is-busy{opacity:.5}.tool__preview .sd-app-sheetprev .sd-app-sheet{display:block;width:100%;height:auto;max-width:100%;max-height:none;box-shadow:none}.sd-app-paste{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;letter-spacing:.02em}@media print{.sd-app-sheet{width:auto}}@media(max-width:420px){.sd-app-tab{padding:8px 14px;flex:auto}.sd-app-type .field{min-width:0;flex:1 1 120px}}.sd-board-wrap{width:100%;max-width:560px;margin:0 auto}.sd-board-wrap--big{max-width:680px}.sd-board{outline:none;border-radius:4px;background:#fff;box-shadow:0 2px 12px rgba(20,40,70,.14);touch-action:manipulation;-webkit-tap-highlight-color:transparent}.sd-board:focus-visible{outline:3px solid var(--brand);outline-offset:2px}.sd-board__scroll{width:100%}.sd-board .sd-svg{display:block;width:100%;height:auto;user-select:none;-webkit-user-select:none}.sd-board-wrap--zoom .sd-board__scroll{overflow:auto;max-height:80vh;overscroll-behavior:contain}.sd-board-wrap--zoom .sd-board .sd-svg{width:160%;max-width:none}.sd-board .sd-val,.sd-board .sd-sol{fill:var(--brand)}.sd-board .sd-given{fill:var(--ink)}.sd-board .sd-thick{stroke:var(--ink)}.sd-board .sd-selected{fill:color-mix(in srgb,var(--brand) 38%,#fff)}.sd-board .sd-same{fill:color-mix(in srgb,var(--brand) 22%,#fff)}.sd-board .sd-peer{fill:color-mix(in srgb,var(--brand) 9%,#fff)}.sd-board--pencil .sd-selected{fill:#f6e7a8}.sd-zoom{margin-top:8px}.sd-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.sd-pad{display:grid;gap:8px;width:100%;max-width:560px;margin:12px auto 0}.sd-pad__digits{display:grid;grid-template-columns:repeat(auto-fit,minmax(42px,1fr));gap:6px}.sd-pad--wide .sd-pad__digits{grid-template-columns:repeat(auto-fit,minmax(44px,1fr))}.sd-pad__acts{display:flex;flex-wrap:wrap;gap:6px}.sd-pad__btn{font:inherit;font-size:18px;font-weight:600;min-width:42px;min-height:46px;padding:6px 4px;border-radius:8px;border:1px solid #c5ced8;background:#fff;color:var(--ink);cursor:pointer;touch-action:manipulation}.sd-pad__btn:hover{border-color:var(--brand);color:var(--brand)}.sd-pad__btn:focus-visible{outline:2px solid var(--brand);outline-offset:1px}.sd-pad__btn.is-done{opacity:.35}.sd-pad__act{flex:1 1 64px;font-size:14px}.sd-pad__act[aria-pressed=true],.sd-pad__act.is-on{background:var(--brand);color:#fff;border-color:var(--brand)}@media(max-width:360px){.sd-pad__btn{font-size:16px}}.sd-create .tool__stage{order:0;position:static;min-width:0}.sd-create .tool__panel{min-width:0}.sd-create [hidden]{display:none!important}.sd-create-seg{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;margin-bottom:14px;background:var(--surface-2,#eef2f6);border-radius:10px}.sd-create-seg__btn{font:inherit;font-size:15px;font-weight:600;min-height:44px;padding:6px 8px;border:0;border-radius:8px;background:0 0;color:#344150;cursor:pointer}.sd-create-seg__btn[aria-pressed=true]{background:var(--brand);color:#fff}.sd-create-seg__btn:focus-visible{outline:2px solid var(--brand);outline-offset:1px}.sd-create .tool__panel textarea{width:100%;box-sizing:border-box;font:15px/1.4 ui-monospace,Menlo,Consolas,monospace;padding:8px 10px;border:1px solid #c5ced8;border-radius:8px;resize:vertical;min-height:64px}.sd-create-paper{margin-top:12px}.sd-create-note{margin-top:12px}.sd-create-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:14px}.sd-create-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow);min-width:0}.sd-create-card__head{display:flex;justify-content:space-between;align-items:baseline;gap:8px;flex-wrap:wrap;margin-bottom:6px;font-size:14px}.sd-create-card__head span{color:var(--muted)}.sd-create-card__grid .sd-svg{display:block;width:100%;height:auto;background:#fff}.sd-create-card__acts{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.sd-create .btn{min-height:44px}.sd-create-card .btn.chip{min-height:40px}.sd-create-card .btn.chip[aria-pressed=true]{background:var(--brand);color:#fff;border-color:var(--brand)}.sd-create-out .tool__actions{margin-top:12px}.sd-create-play{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin-bottom:16px;box-shadow:var(--shadow)}.sd-create-play__title{margin:0 0 10px;font-size:18px}.sd-create-edit{margin-bottom:4px}.sd-create-status{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:6px;font-size:15px}.sd-create-status li{padding:8px 12px;border-radius:8px;background:var(--surface-2,#eef2f6);color:#1f2a37;border-left:4px solid #c5ced8}.sd-create-status__ok{border-left-color:#1a7f4b!important;background:#e7f6ee!important}.sd-create-status__warn{border-left-color:#b7791f!important;background:#fdf3dc!important}.sd-create-status__bad{border-left-color:var(--bad,#b42318)!important;background:#fdecea!important}.sd-tpl-stage{padding:12px}.sd-tpl-sheet{width:100%;max-width:520px;background:#fff;box-shadow:0 2px 12px rgba(20,40,70,.18);line-height:0}.tool__preview .sd-tpl-sheet .sd-tpl-page{display:block;width:100%;height:auto;max-width:100%;max-height:none;box-shadow:none}@media print{.sd-tpl-page{width:auto}}.sd-tut .tool__stage{order:-1;position:static;min-width:0}@media(min-width:860px){.sd-tut .tool__stage{order:0}}.sd-tut .tool__panel{min-width:0}.sd-tut [hidden]{display:none!important}.sd-tut-seg{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:4px;margin-bottom:14px;background:var(--surface-2,#eef2f6);border-radius:10px}.sd-tut-seg__btn{font:inherit;font-size:14px;font-weight:600;min-height:44px;padding:6px 4px;border:0;border-radius:8px;background:0 0;color:#344150;cursor:pointer}.sd-tut-seg__btn[aria-pressed=true]{background:var(--brand);color:#fff}.sd-tut-seg__btn:focus-visible{outline:2px solid var(--brand);outline-offset:1px}.sd-tut .btn{min-height:44px}.sd-tut-part>.field{margin-bottom:12px}.sd-tut-board{width:100%;max-width:560px;margin:0 auto;background:#fff;border-radius:4px;box-shadow:0 2px 12px rgba(20,40,70,.14);line-height:0}.sd-tut-board .sd-svg{display:block;width:100%;height:auto}.tool__preview .sd-tut-board .sd-svg,.sd-tut-board svg{max-height:none;box-shadow:none}.sd-tut-msg{margin:12px 0 0;padding:10px 12px;min-height:3.2em;font-size:15px;line-height:1.5;background:var(--surface-2,#eef2f6);border-radius:8px;border-left:4px solid var(--brand)}.sd-tut-msg.is-ok{border-left-color:#1a7f4b;background:#e7f6ee}.sd-tut-msg.is-bad{border-left-color:var(--bad,#b42318);background:#fdecea}.sd-tut-do{display:inline-block;font-weight:600}.sd-tut-side h2{margin:0 0 8px;font-size:20px}.sd-tut-side h3{margin:16px 0 6px;font-size:16px}.sd-tut-side p{margin:0 0 10px}.sd-tut-list{margin:0 0 10px;padding-left:20px}.sd-tut-list li{margin:3px 0}.sd-tut-count{color:var(--muted);font-size:13px;margin-bottom:2px!important}.sd-tut-legend{font-size:13px;line-height:1.9;color:#344150}.sd-tut-key{display:inline-block;width:14px;height:14px;border-radius:3px;margin:0 4px -2px 0;border:1px solid #9aa7b4}.sd-tut-key--hint{background:#fde9a0}.sd-tut-key--unit{background:#cfe0f5}.sd-tut-key--rm{border-radius:50%;border:2px solid #c0261c;background:#fff}.sd-tut-key--put{border-radius:50%;border:2px solid #1a7f4b;background:#fff}.sd-tut-print{margin-top:14px;padding-top:12px;border-top:1px solid var(--line);display:grid;gap:10px}.sd-tut-counts{font-size:14px;color:#344150}.sd-tut-log{margin:0;padding-left:24px;max-height:260px;overflow:auto;font-size:14px;line-height:1.45;border:1px solid var(--line);border-radius:8px;padding-top:6px;padding-bottom:6px;background:#fff}.sd-tut-log li{margin:2px 0;padding:1px 4px;border-radius:4px}.sd-tut-log li.is-now{background:#fde9a0}.sd-tut-cheat{display:flex;flex-direction:column;font-family:Arial,Helvetica,sans-serif;color:#111827}.sd-tut-cheat header h2{margin:0;font-size:15pt}.sd-tut-cheat header p{margin:1mm 0 3mm;font-size:8pt;color:#4b5563}.sd-tut-cheat__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3mm 5mm;flex:1;align-content:start}.sd-tut-cheat__item{break-inside:avoid}.sd-tut-cheat__fig{line-height:0}.sd-tut-cheat__fig svg{width:44mm;height:auto;display:block}.sd-tut-cheat__item h3{margin:1.2mm 0 .5mm;font-size:9pt}.sd-tut-cheat__item p{margin:0;font-size:7pt;line-height:1.3;color:#374151}.sd-tut-cheat footer{font-size:7pt;color:#4b5563;padding-top:2mm}.wrap{max-width:var(--wrap,1180px)}.page-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:8px 48px;align-items:start}.page-grid>.guide,.page-grid>.prose{max-width:760px;width:100%;padding-top:0}.page-grid>.prose{padding-top:22px}@media(min-width:1100px){.page-grid{grid-template-columns:minmax(0,1fr)300px}.page-grid>.guide,.page-grid>.prose{max-width:none}.page-side{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow-y:auto;padding-top:18px}}.page-side{display:grid;gap:16px;padding-bottom:28px;font-size:14.5px}.side-card{background:var(--surface,#fff);border:1px solid var(--line,#dfe5ec);border-radius:var(--radius,10px);padding:14px 16px}.side-title{margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted,#5a6675)}.side-card ol,.side-card ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}.side-card li a{display:block;padding:5px 8px;margin:0 -8px;border-radius:6px;color:var(--ink-2,var(--ink,#1d2733));text-decoration:none;line-height:1.35}.side-card li a:hover{background:var(--surface-2,var(--soft,#f4f7fa));color:var(--accent,var(--brand,#2c5d8f))}.side-toc li a{border-left:2px solid transparent;border-radius:0 6px 6px 0;margin-left:-16px;padding-left:14px}.side-toc li a:hover{border-left-color:var(--accent,var(--brand,#2c5d8f))}.side-all{display:inline-block;margin-top:8px;font-weight:600;text-decoration:none}.side-ad:empty{display:none}@media(max-width:1099px){.side-toc{display:none}}.home-tools .directory{background:0 0;border:0;padding:6px 0 22px}.home-tools .directory .wrap{padding:0;max-width:none}.guide h2[id],.prose h2[id]{scroll-margin-top:16px}