*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:#f6f7f9;color:#1a1a2e;line-height:1.6}
header{background:#1a1a2e;color:#fff;padding:14px 20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}
header a{color:#fff;text-decoration:none;font-weight:700;font-size:18px}
nav{display:flex;gap:14px;flex-wrap:wrap}
nav a{color:#aab;font-size:14px;font-weight:400}
main{max-width:760px;margin:28px auto;padding:0 16px}
h1{font-size:26px;margin-bottom:6px}
.desc{color:#667;font-size:14px;margin-bottom:22px}
.card{background:#fff;border-radius:12px;padding:22px;margin-bottom:18px;box-shadow:0 1px 4px rgba(0,0,0,.06)}
label{display:block;font-size:13px;color:#445;margin:12px 0 4px}
input,select,textarea{width:100%;padding:10px;border:1px solid #ccd;border-radius:8px;font-size:15px}
textarea{min-height:110px;font-family:ui-monospace,monospace}
button{background:#4a6cf7;color:#fff;border:0;border-radius:8px;padding:11px 22px;font-size:15px;cursor:pointer;margin-top:14px}
button:hover{background:#3a5ce5}
.out{margin-top:16px;padding:14px;background:#f0f3ff;border-radius:8px;font-family:ui-monospace,monospace;font-size:14px;word-break:break-all;min-height:20px}
.row{display:flex;gap:10px;flex-wrap:wrap}
.row>div{flex:1;min-width:140px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.tool-card{background:#fff;border-radius:12px;padding:18px;box-shadow:0 1px 4px rgba(0,0,0,.06);text-decoration:none;color:#1a1a2e}
.tool-card:hover{box-shadow:0 3px 10px rgba(0,0,0,.1)}
.tool-card h2{font-size:16px;margin-bottom:4px}
.tool-card p{font-size:13px;color:#667}
footer{text-align:center;color:#889;font-size:13px;padding:30px 16px}
footer a{color:#4a6cf7;text-decoration:none}
.note{font-size:12px;color:#99a;margin-top:8px}
.faq dt{font-weight:700;font-size:15px;margin-top:14px;color:#1a1a2e}
.faq dd{font-size:14px;color:#445;margin:6px 0 0}