:root { --bg:#f5f5f4; --surface:#fafaf9; --text:#1c1917; --muted:#57534e; --border:#d6d3d1; --primary:#0891b2; --primary-dark:#0e7490; }
*{box-sizing:border-box}
body{margin:0;color:var(--text);background:var(--bg);font-family:"Helvetica Neue","Noto Sans",sans-serif;line-height:1.5}
.container{width:min(1040px,92vw);margin:0 auto}
.site-header{border-bottom:1px solid var(--border);background:var(--surface)}
.site-header .container{display:flex;justify-content:space-between;align-items:center;min-height:56px}
.brand{color:var(--text);text-decoration:none;font-weight:700}
nav a{color:var(--muted);margin-left:16px;text-decoration:none}nav a:hover{color:var(--text)}
.hero{padding:44px 0}h1{margin:0 0 12px;font-size:clamp(28px,4vw,40px);line-height:1.2}h2{margin:0 0 8px;font-size:22px}
.hero p{max-width:720px;color:var(--muted);font-size:18px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.btn{display:inline-block;padding:10px 14px;border:1px solid var(--border);border-radius:8px;text-decoration:none;color:var(--text);background:var(--surface)}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}
.section{padding:28px 0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.card{border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:16px}
.card p,.faq p,.site-footer p{margin:0;color:var(--muted)}
.faq details{border:1px solid var(--border);border-radius:8px;background:var(--surface);padding:12px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:600}
.site-footer{border-top:1px solid var(--border);padding:20px 0}
.tool-wrap{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.tool-card{border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:16px}
label{display:block;font-weight:600;margin-bottom:6px}input{width:100%;border:1px solid var(--border);border-radius:8px;padding:9px;font-size:14px}
.inline{display:flex;gap:8px;margin-top:8px}.inline input{flex:1}
.preview{border:1px solid var(--border);border-radius:8px;height:80px;margin-top:10px;background:#000}
.msg{font-size:13px;color:#0b7a2f;min-height:20px;margin-top:8px}.msg.error{color:#b42318}
@media (max-width:760px){.grid,.tool-wrap{grid-template-columns:1fr}}