*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#2563eb;--primary-dark:#1d4ed8;--bg:#f8fafc;--card:#fff;--text:#1e293b;--text-muted:#64748b;--border:#e2e8f0;--success:#22c55e}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.container{max-width:1200px;margin:0 auto;padding:0 20px}header{background:var(--card);border-bottom:1px solid var(--border);padding:20px 0;position:-webkit-sticky;position:sticky;top:0;z-index:100}header .container{display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;font-weight:700;color:var(--primary)}.logo,nav a{text-decoration:none}nav a{color:var(--text-muted);margin-left:24px;transition:color .2s}nav a:hover{color:var(--primary)}main{padding:40px 0;min-height:calc(100vh - 200px)}h1{font-size:2.5rem;margin-bottom:16px;color:var(--text)}h2{font-size:1.5rem;margin-bottom:12px}.hero{text-align:center;padding:60px 0}.hero p{color:var(--text-muted);font-size:1.2rem;max-width:600px;margin:0 auto 40px}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:24px;gap:24px;margin-top:40px}.tool-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}.tool-card:hover{transform:translateY(-4px);box-shadow:0 12px 24px rgba(0,0,0,.1)}.tool-icon{font-size:2.5rem;margin-bottom:16px}.tool-card h3{font-size:1.2rem;margin-bottom:8px}.tool-card p{color:var(--text-muted);font-size:.9rem}.tool-page{max-width:800px;margin:0 auto}.tool-page h1{margin-bottom:8px}.tool-page .description{color:var(--text-muted);margin-bottom:32px}.tool-box{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:32px;margin-bottom:24px}label{display:block;font-weight:500;margin-bottom:8px}input[type=number],input[type=text],select,textarea{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:1rem;margin-bottom:16px;font-family:inherit}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}textarea{min-height:150px;resize:vertical}.btn,button{background:var(--primary);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:background .2s;display:inline-flex;align-items:center;gap:8px}.btn:hover,button:hover{background:var(--primary-dark)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.result{background:#f1f5f9;border-radius:8px;padding:20px;margin-top:20px;font-family:SF Mono,Consolas,monospace;word-break:break-all}.result-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.copied{color:var(--success);font-weight:500}.options{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:20px}.option{display:flex;align-items:center;gap:8px}.option input[type=checkbox],.option input[type=number]{width:auto;margin:0}.option input[type=number]{width:80px;padding:8px 12px}.ad-container{background:#f1f5f9;border:1px dashed var(--border);border-radius:8px;padding:20px;margin:24px 0;min-height:100px;display:flex;align-items:center;justify-content:center}.ad-container,footer{text-align:center;color:var(--text-muted)}footer{background:var(--card);border-top:1px solid var(--border);padding:40px 0}footer a{color:var(--text-muted);text-decoration:none}footer a:hover{color:var(--primary)}.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:16px}@media (max-width:768px){h1{font-size:2rem}.hero{padding:40px 0}.tools-grid{grid-template-columns:1fr}nav{display:none}}mark{background:#fef08a;color:inherit;padding:2px 0;border-radius:2px}.diff-added{background:#dcfce7}.diff-removed{background:#fee2e2}pre{overflow-x:auto}input[type=range]{cursor:pointer}input[type=color]{cursor:pointer;border:none;border-radius:4px}input[type=radio]{cursor:pointer}@media (max-width:768px){.split-pane{grid-template-columns:1fr!important}}