*{box-sizing:border-box}
body{margin:0;font-family:Arial,sans-serif;background:#f4f6fb;color:#111}
header{background:#0f172a;padding:18px}
header .nav{max-width:1200px;margin:auto;display:flex;gap:20px;align-items:center}
header a{color:#fff;text-decoration:none;font-weight:bold}
.container{max-width:1200px;margin:auto;padding:24px}
.hero{padding:60px 20px;text-align:center}
.hero h1{font-size:52px;margin:0 0 12px}
.hero p{font-size:20px;color:#555}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.card{background:#fff;padding:24px;border-radius:14px;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.tool-grid a,.cta{display:block;background:#fff;border:1px solid #ddd;padding:14px;border-radius:10px;text-decoration:none;color:#111}
input,select,button{width:100%;padding:12px;margin:8px 0;border-radius:8px;border:1px solid #ccc;background:#fff;color:#111}
button{background:#ff7a00;color:#fff;border:none;font-weight:bold}
.result{background:#eef2f7;padding:12px;border-radius:8px;min-height:40px}
footer{background:#0f172a;color:#fff;padding:28px;margin-top:40px}
footer a{color:#fff;margin-right:15px}