*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--bg:#f8fafc;--card:#fff;--text:#1e293b;--text-light:#64748b;--border:#e2e8f0;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,.1)}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{text-decoration:none;color:var(--primary)}
a:hover{text-decoration:underline}
.container{max-width:900px;margin:0 auto;padding:0 20px}
header{background:var(--card);border-bottom:1px solid var(--border);padding:16px 0;position:sticky;top:0;z-index:100;backdrop-filter:blur(10px);background:rgba(255,255,255,.9)}
header .container{display:flex;align-items:center;justify-content:space-between}
.logo{font-size:1.25rem;font-weight:700;color:var(--text)}
.logo span{color:var(--primary)}
nav a{margin-left:20px;font-size:.9rem;color:var(--text-light)}
nav a:hover{color:var(--primary)}
.hero{text-align:center;padding:60px 20px 40px}
.hero h1{font-size:2.2rem;font-weight:800;margin-bottom:12px;background:linear-gradient(135deg,var(--primary),#7c3aed);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{color:var(--text-light);font-size:1.1rem;max-width:600px;margin:0 auto}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;padding:40px 0 60px}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .2s;cursor:pointer}
.tool-card:hover{border-color:var(--primary);box-shadow:0 4px 12px rgba(37,99,235,.15);transform:translateY(-2px)}
.tool-card .icon{font-size:2rem;margin-bottom:12px}
.tool-card h3{font-size:1rem;font-weight:600;margin-bottom:6px}
.tool-card p{font-size:.85rem;color:var(--text-light)}
.tool-page{padding:40px 0 60px}
.tool-page h1{font-size:1.8rem;font-weight:700;margin-bottom:8px}
.tool-page .subtitle{color:var(--text-light);margin-bottom:30px}
.tool-container{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:30px}
textarea,input[type="text"],input[type="number"],select{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:.9rem;resize:vertical;background:var(--bg)}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.output-box{background:#1e293b;color:#e2e8f0;padding:16px;border-radius:8px;font-family:'SF Mono',Monaco,Consolas,monospace;font-size:.85rem;white-space:pre-wrap;word-break:break-all;min-height:100px;max-height:500px;overflow:auto;margin-top:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border:none;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .15s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-group{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
.features{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin:30px 0}
.feature{padding:16px;background:var(--bg);border-radius:8px}
.feature h4{font-size:.9rem;margin-bottom:4px}
.feature p{font-size:.8rem;color:var(--text-light)}
.section-title{font-size:1.3rem;font-weight:700;margin:40px 0 16px}
.seo-content{color:var(--text-light);font-size:.9rem;line-height:1.8}
.seo-content h2{color:var(--text);font-size:1.1rem;margin:24px 0 8px}
.seo-content ul{padding-left:20px;margin:8px 0}
.seo-content li{margin:4px 0}
footer{background:var(--card);border-top:1px solid var(--border);padding:30px 0;text-align:center;color:var(--text-light);font-size:.85rem}
@media(max-width:640px){.hero h1{font-size:1.6rem}.tools-grid{grid-template-columns:1fr}.btn-group{flex-direction:column}.btn{justify-content:center}}