:root{--bg: #0f0f0f;--bg-secondary: #1a1a1a;--bg-tertiary: #252525;--text: #e0e0e0;--text-muted: #888;--primary: #6366f1;--primary-hover: #818cf8;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--border: #333;--radius: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.container{max-width:1400px;margin:0 auto;padding:2rem}header{text-align:center;margin-bottom:3rem}header h1{font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--primary),#a855f7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-muted);font-size:1.1rem;margin-top:.5rem}.links{margin-top:1rem}.links a{color:var(--primary);text-decoration:none}.links a:hover{text-decoration:underline}.demo-section{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;margin-bottom:2rem}.demo-section h2{font-size:1.5rem;margin-bottom:.5rem}.description{color:var(--text-muted);margin-bottom:1.5rem}.editors{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:.5rem}.merge-flow{display:flex;justify-content:center;padding:.75rem 0;color:var(--text-muted);opacity:.5}.merge-flow [data-lucide]{width:1.5rem;height:1.5rem}.editors.two-col{grid-template-columns:repeat(2,1fr)}@media(max-width:900px){.editors{grid-template-columns:1fr}}.editor-group{display:flex;flex-direction:column;gap:.5rem}.editor-group label{font-weight:600;font-size:.9rem;color:var(--text-muted);display:flex;align-items:center;gap:.4rem}[data-lucide]{width:1em;height:1em;stroke-width:2}textarea{width:100%;min-height:120px;max-height:600px;padding:1rem;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:JetBrains Mono,Fira Code,monospace;font-size:.9rem;field-sizing:content;overflow-y:auto;resize:vertical}textarea:focus{outline:none;border-color:var(--primary)}.controls{display:flex;gap:1rem;flex-wrap:wrap;align-items:center}.control-group{display:flex;align-items:center;gap:.5rem}.control-group label{font-weight:500;color:var(--text-muted);font-size:.9rem}.control-hint{color:var(--text-muted);font-size:.85rem;font-style:italic}select,button{padding:.6rem 1rem;border-radius:var(--radius);font-size:.95rem;cursor:pointer;transition:all .2s}select{background:var(--bg-tertiary);border:1px solid var(--border);color:var(--text);min-width:160px}select:hover{border-color:var(--text-muted)}select:focus{outline:none;border-color:var(--primary)}button{background:var(--bg-tertiary);border:1px solid var(--border);color:var(--text)}button.primary{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}button.primary:hover{background:var(--primary-hover)}button:disabled{opacity:.5;cursor:not-allowed}.progress{margin-top:1.5rem}.progress-bar{height:8px;background:var(--bg-tertiary);border-radius:4px;overflow:hidden;margin-bottom:.5rem}.progress-fill{height:100%;background:var(--primary);width:0%;transition:width .3s}#progress-text{font-size:.9rem;color:var(--text-muted)}.result{margin-top:2rem}.result h3{margin-bottom:1rem}.stats{display:flex;gap:1.5rem;margin-bottom:1rem;flex-wrap:wrap}.stat{display:flex;align-items:center;gap:.5rem;font-size:.9rem}.stat-value{font-weight:700;font-size:1.1rem}.stat-value.success{color:var(--success)}.stat-value.warning{color:var(--warning)}.stat-value.danger{color:var(--danger)}#merged-output,#updates-output{min-height:100px;background:var(--bg)}.textarea-wrapper{position:relative}.copy-btn{position:absolute;top:.5rem;right:.5rem;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:4px;padding:.4rem .6rem;font-size:1rem;cursor:pointer;opacity:.7;transition:opacity .2s}.copy-btn:hover{opacity:1}.copy-btn.copied{color:var(--success)}.conflicts{margin-top:1.5rem}.conflicts h4{color:var(--danger);margin-bottom:1rem}.conflict-item{background:var(--bg-tertiary);border:1px solid var(--danger);border-radius:var(--radius);padding:1rem;margin-bottom:1rem}.conflict-item h5{font-size:.9rem;color:var(--text-muted);margin-bottom:.5rem}.conflict-content{font-family:JetBrains Mono,Fira Code,monospace;font-size:.85rem;white-space:pre-wrap;padding:.5rem;background:var(--bg);border-radius:4px;margin-bottom:.5rem}.conflict-base{border-left:3px solid var(--primary)}.conflict-user{border-left:3px solid var(--warning)}#diff-output,.diff-output-inline{font-family:JetBrains Mono,Fira Code,monospace;font-size:.9rem;background:var(--bg);padding:1rem;border-radius:var(--radius);white-space:pre-wrap}.diff-from-preferred{margin-bottom:1rem}.diff-from-preferred h4{font-size:.9rem;color:var(--text-muted);margin-bottom:.5rem}.diff-added{background:#22c55e33;color:var(--success)}.diff-removed{background:#ef444433;color:var(--danger);text-decoration:line-through}.diff-modified{background:#f59e0b33;color:var(--warning)}.diff-unchanged{color:var(--text-muted)}footer{text-align:center;margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border);color:var(--text-muted);font-size:.9rem}footer a{color:var(--primary);text-decoration:none}.code-example{margin-top:1rem;margin-bottom:1.5rem}.code-example summary{cursor:pointer;color:var(--primary);font-size:.9rem;font-weight:500;padding:.5rem 0;display:flex;align-items:center;gap:.5rem;-webkit-user-select:none;user-select:none}.code-example summary:hover{color:var(--primary-hover)}.code-example summary::marker{content:""}.code-example summary:before{content:"▶";font-size:.7rem;transition:transform .2s}.code-example[open] summary:before{transform:rotate(90deg)}.code-example pre{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;margin-top:.5rem;overflow-x:auto;font-family:JetBrains Mono,Fira Code,monospace;font-size:.85rem;line-height:1.5}.code-example code{color:var(--text)}.code-example .comment{color:var(--text-muted)}.code-example .keyword{color:#c792ea}.code-example .string{color:#c3e88d}.code-example .function{color:#82aaff}.code-example .property{color:#f78c6c}