:root{--bg:#f7f8fa;--surface:#fff;--surface-2:#f1f3f5;--text:#202124;--muted:#667085;--border:#dfe3e8;--accent:#0d6efd;--accent-hover:#0b5ed7;--danger:#c62828;--success:#16794b;--shadow:0 8px 28px rgba(16,24,40,.07);--radius:12px;--max:1180px}
*{box-sizing:border-box}html{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5}body{margin:0;min-height:100vh;background:var(--bg)}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}.container{width:min(var(--max),calc(100% - 32px));margin:0 auto}.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}.nav{height:62px;display:flex;align-items:center;gap:18px}.brand{font-weight:700;color:var(--text);font-size:1.08rem;margin-right:auto}.nav a:not(.brand){color:#3d4650;font-size:.93rem}.nav-search{width:min(340px,38vw);position:relative}.nav-search input{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:8px;background:#fff}.hero{padding:52px 0 30px}.hero h1{font-size:clamp(2rem,4vw,3rem);line-height:1.1;margin:0 0 12px;letter-spacing:-.035em}.hero p{max-width:760px;margin:0;color:var(--muted);font-size:1.05rem}.privacy-chip{display:inline-flex;align-items:center;gap:6px;margin-top:16px;padding:6px 10px;border:1px solid #bfd8ff;background:#eef5ff;border-radius:999px;color:#245ea8;font-size:.85rem}.section{padding:12px 0 36px}.section-head{display:flex;gap:16px;align-items:end;justify-content:space-between;margin-bottom:14px}.section-head h2{font-size:1.35rem;margin:0}.section-head p{margin:0;color:var(--muted);font-size:.9rem}.category-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 20px}.chip{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:7px 12px;font-size:.88rem}.chip.active,.chip:hover{border-color:#9ec5fe;background:#eef5ff;color:#174f9c;text-decoration:none}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:17px;box-shadow:0 1px 1px rgba(16,24,40,.02);display:flex;flex-direction:column;min-height:160px}.tool-card:hover{border-color:#b9c4cf;box-shadow:var(--shadow)}.tool-card h3{font-size:1rem;margin:0 0 7px}.tool-card h3 a{color:var(--text)}.tool-card p{color:var(--muted);font-size:.9rem;margin:0 0 16px;flex:1}.tool-card .meta{display:flex;align-items:center;justify-content:space-between;gap:10px}.tag{font-size:.75rem;color:#59636e;background:var(--surface-2);border-radius:6px;padding:3px 7px}.open-link{font-size:.86rem;font-weight:600}.site-footer{border-top:1px solid var(--border);background:var(--surface);margin-top:36px}.footer-inner{padding:24px 0;display:flex;justify-content:space-between;gap:18px;color:var(--muted);font-size:.86rem;flex-wrap:wrap}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.footer-links a{color:var(--muted)}
.tool-hero{padding:34px 0 18px}.crumbs{font-size:.84rem;color:var(--muted);margin-bottom:10px}.tool-hero h1{margin:0 0 8px;font-size:clamp(1.8rem,3vw,2.4rem);letter-spacing:-.025em}.tool-hero p{margin:0;color:var(--muted);max-width:780px}.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;align-items:start}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 1px 2px rgba(16,24,40,.03)}.panel-head{padding:15px 18px;border-bottom:1px solid var(--border)}.panel-head h2,.panel-head h3{margin:0;font-size:1rem}.panel-body{padding:18px}.stack{display:grid;gap:14px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.field{display:grid;gap:6px}.field label{font-size:.83rem;font-weight:600;color:#3d4650}.field small{color:var(--muted);font-size:.78rem}.input,select,textarea,input[type=text],input[type=number],input[type=datetime-local],input[type=time],input[type=date],input[type=url],input[type=password],input[type=file]{width:100%;border:1px solid #cfd5dc;border-radius:8px;background:#fff;padding:9px 10px;outline:none}.input:focus,select:focus,textarea:focus,input:focus{border-color:#86b7fe;box-shadow:0 0 0 3px rgba(13,110,253,.1)}textarea{min-height:130px;resize:vertical}.btn{border:1px solid var(--border);background:#fff;border-radius:8px;padding:9px 13px;font-weight:600;font-size:.88rem;display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn:hover{text-decoration:none;background:#f8f9fa}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-hover)}.btn.danger{color:var(--danger);border-color:#f0b7b7}.btn.small{padding:6px 9px;font-size:.8rem}.dropzone{border:1.5px dashed #aeb7c2;background:#fafbfc;border-radius:10px;padding:30px 16px;text-align:center;color:var(--muted);transition:.15s}.dropzone.drag{border-color:var(--accent);background:#eef5ff}.dropzone strong{color:var(--text)}.file-list{display:grid;gap:7px}.file-item{display:flex;gap:10px;align-items:center;border:1px solid var(--border);border-radius:8px;padding:9px 10px}.file-item .grow{min-width:0;flex:1}.file-item .name{font-size:.87rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-item .sub{color:var(--muted);font-size:.76rem}.status{padding:9px 11px;border-radius:8px;font-size:.84rem;background:var(--surface-2);color:#4b5560}.status.ok{background:#eaf7f0;color:var(--success)}.status.error{background:#fff0f0;color:var(--danger)}.status.busy{background:#eef5ff;color:#245ea8}.preview{min-height:260px;background:#eef0f2;border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:auto;position:relative}.preview canvas,.preview img,.preview video{max-width:100%;max-height:620px;display:block}.result-box{background:#fafbfc;border:1px solid var(--border);border-radius:9px;padding:12px;white-space:pre-wrap;word-break:break-word;max-height:420px;overflow:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.84rem}.note{font-size:.82rem;color:var(--muted);padding:10px 12px;background:#fafbfc;border-left:3px solid #b8c2cc;border-radius:6px}.warn{border-left-color:#f3b33d;background:#fffaf0}.success{border-left-color:#3aa76d;background:#f1fbf5}.side-list{display:grid;gap:8px}.side-link{display:block;padding:9px 10px;border-radius:7px;color:#3d4650;font-size:.86rem}.side-link:hover{background:var(--surface-2);text-decoration:none}.side-link.current{background:#eef5ff;color:#174f9c}.canvas-editor{display:grid;gap:10px}.canvas-wrap{background:#e9ecef;border-radius:10px;padding:12px;overflow:auto}.canvas-wrap canvas{display:block;max-width:100%;margin:auto;background:#fff;box-shadow:0 3px 12px rgba(0,0,0,.08)}.range-row{display:grid;grid-template-columns:120px 1fr 48px;align-items:center;gap:8px;font-size:.82rem}.range-row output{text-align:right;color:var(--muted)}.hidden{display:none!important}.inline-code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f1f3f5;padding:2px 5px;border-radius:4px}.privacy-page{max-width:850px}.privacy-page h1{font-size:2.4rem}.privacy-page h2{margin-top:2rem;font-size:1.35rem}.privacy-page h3{font-size:1rem;margin-top:1.4rem}.privacy-page p,.privacy-page li{color:#414a54}.privacy-page table{width:100%;border-collapse:collapse;font-size:.9rem}.privacy-page th,.privacy-page td{border:1px solid var(--border);padding:9px;text-align:left;vertical-align:top}.counter{font-variant-numeric:tabular-nums}.big-clock{font-size:clamp(2.8rem,8vw,6.5rem);font-weight:700;letter-spacing:.03em;text-align:center}.two-clock{display:grid;grid-template-columns:1fr 1fr;min-height:300px}.chess-side{display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid var(--border);font-size:2.5rem;font-weight:700}.chess-side.active{background:#eef5ff}.editor-area{min-height:360px;border:1px solid var(--border);border-radius:8px;padding:14px;background:#fff;overflow:auto}.signature-pad{touch-action:none;border:1px solid var(--border);border-radius:8px;background:#fff;width:100%;height:220px}.progress{height:8px;background:#e9ecef;border-radius:999px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--accent);width:0;transition:width .2s}.search-empty{padding:48px 0;text-align:center;color:var(--muted)}
@media(max-width:920px){.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-layout{grid-template-columns:1fr}.nav a:not(.brand):not(.nav-hide){display:none}.nav-search{width:min(330px,55vw)}}
@media(max-width:620px){.container{width:min(100% - 20px,var(--max))}.hero{padding-top:34px}.tool-grid{grid-template-columns:1fr}.grid2,.grid3{grid-template-columns:1fr}.nav{gap:10px}.nav-search{width:48vw}.tool-hero{padding-top:24px}.panel-body{padding:14px}.two-clock{grid-template-columns:1fr;min-height:420px}.range-row{grid-template-columns:100px 1fr 40px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.collage-thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:8px;margin:12px 0}.collage-thumb{aspect-ratio:1;border:1px solid var(--border);background:#fafbfc;border-radius:8px;padding:3px;overflow:hidden;color:var(--muted);font-weight:700}.collage-thumb img{width:100%;height:100%;object-fit:cover;border-radius:5px;display:block}.collage-thumb.active{border:2px solid var(--accent);background:#eef5ff}.panel-subhead{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:4px}.prose-page{max-width:900px;padding:40px 0 64px}.prose-page h1{font-size:clamp(2rem,4vw,2.8rem);margin:0 0 8px}.prose-page .lede{font-size:1.05rem;color:var(--muted);max-width:760px}.prose-page h2{margin-top:2rem;font-size:1.35rem}.prose-page h3{margin-top:1.35rem;font-size:1.04rem}.prose-page p,.prose-page li{color:#414a54}.prose-page code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f1f3f5;padding:2px 5px;border-radius:4px}.prose-page table{width:100%;border-collapse:collapse;font-size:.9rem}.prose-page th,.prose-page td{border:1px solid var(--border);padding:9px;text-align:left;vertical-align:top}.callout{border:1px solid var(--border);background:#fff;border-radius:10px;padding:14px 16px}.callout strong{display:block;margin-bottom:4px}