:root{--bg:#f8f9fa;--surface:#fff;--text:#1a1a1a;--text-muted:#666;--border:#e0e0e0;--accent:#2563eb;--accent-hover:#1d4ed8;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,0.06);}*,*::before,*::after{box-sizing:border-box;}html{font-size:16px;-webkit-font-smoothing:antialiased;}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg);min-height:100vh;display:flex;flex-direction:column;}.main{flex:1;max-width:960px;margin:0 auto;padding:1.5rem;width:100%;}.site-header{background:var(--surface);border-bottom:1px solid var(--border);padding:0.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.75rem;}.site-logo{font-weight:600;color:var(--text);text-decoration:none;}.site-logo:hover{color:var(--accent);}.site-nav{display:flex;gap:1.25rem;}.site-nav a{color:var(--text-muted);text-decoration:none;font-size:0.9rem;}.site-nav a:hover{color:var(--accent);}.site-footer{text-align:center;padding:1rem;color:var(--text-muted);font-size:0.85rem;border-top:1px solid var(--border);background:var(--surface);}.site-footer a{color:var(--accent);text-decoration:none;}.tool-page{padding-top:0.5rem;}.tool-page h1{font-size:1.5rem;margin:0 0 0.5rem;font-weight:600;}.tool-page .tool-desc{color:var(--text-muted);font-size:0.9rem;margin-bottom:1.5rem;}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}label{display:block;font-size:0.85rem;font-weight:500;color:var(--text-muted);margin-bottom:0.25rem;}input,textarea,select,button{font-family:inherit;font-size:1rem;}input[type="text"],input[type="date"],input[type="datetime-local"],textarea{width:100%;padding:0.5rem 0.75rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-sizing:border-box;}input:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px rgba(37,99,235,0.15);}button{cursor:pointer;padding:0.5rem 1rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);}button.primary{background:var(--accent);color:#fff;border-color:var(--accent);}button.primary:hover{background:var(--accent-hover);}.markdown-preview{padding:1rem;min-height:200px;overflow:auto;}.markdown-preview h1{font-size:1.5rem;margin:0.5rem 0;}.markdown-preview h2{font-size:1.25rem;margin:0.5rem 0;}.markdown-preview h3{font-size:1.1rem;margin:0.5rem 0;}.markdown-preview p{margin:0.5rem 0;}.markdown-preview pre{overflow-x:auto;background:var(--bg);padding:0.75rem;border-radius:var(--radius);}.markdown-preview code{font-size:0.9em;}.markdown-preview table{border-collapse:collapse;width:100%;}.markdown-preview th,.markdown-preview td{border:1px solid var(--border);padding:0.4rem 0.6rem;text-align:left;}.markdown-preview th{background:var(--bg);}.markdown-preview ul,.markdown-preview ol{padding-left:1.5rem;margin:0.5rem 0;}.tool-list{list-style:none;padding:0;margin:0;}.tool-list li{margin-bottom:0.5rem;}.tool-list a{display:block;padding:0.75rem 1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);text-decoration:none;transition:border-color 0.15s,box-shadow 0.15s;}.tool-list a:hover{border-color:var(--accent);box-shadow:var(--shadow);}.tool-list small{display:block;color:var(--text-muted);font-size:0.85rem;margin-top:0.25rem;}