:root{
  --primary:#6366f1; --primary-dark:#4f46e5; --accent:#8b5cf6;
  --bg:#f8fafc; --card:#ffffff; --text:#0f172a; --muted:#64748b;
  --border:#e2e8f0; --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;position:relative}
.logo{font-size:1.4rem;font-weight:800;color:var(--primary);text-decoration:none}
.main-nav{display:flex;gap:26px}
.main-nav a{text-decoration:none;color:var(--text);font-weight:500}
.main-nav a:hover{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}
/* Hero */
.hero{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;text-align:center;padding:64px 20px 60px}
.hero h1{font-size:2.4rem;margin-bottom:12px;line-height:1.2}
.hero p{opacity:.92;max-width:620px;margin:0 auto 26px;font-size:1.05rem}
.search-box{max-width:480px;margin:0 auto}
.search-box input{width:100%;padding:14px 22px;border:none;border-radius:999px;font-size:1rem;outline:none;box-shadow:0 8px 20px rgba(0,0,0,.15)}
/* Tool grid */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;padding:44px 0}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-decoration:none;color:var(--text);transition:transform .15s ease,box-shadow .15s ease}
.tool-card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(99,102,241,.16)}
.tool-card .icon{font-size:2.1rem;margin-bottom:10px}
.tool-card h3{margin-bottom:6px;font-size:1.08rem}
.tool-card p{color:var(--muted);font-size:.9rem}
/* Features */
.features{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:52px 0}
.features h2,.section-title{text-align:center;margin-bottom:8px;font-size:1.7rem}
.section-sub{text-align:center;color:var(--muted);margin-bottom:32px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.feature{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:22px;text-align:center}
.feature .icon{font-size:1.8rem;margin-bottom:8px}
/* Tool pages */
.breadcrumb{font-size:.85rem;color:var(--muted);margin:24px 0 8px}
.breadcrumb a{color:var(--primary);text-decoration:none}
.tool-head{text-align:center;max-width:680px;margin:0 auto 28px}
.tool-head h1{font-size:2rem;margin-bottom:10px}
.tool-head p{color:var(--muted)}
.tool-box{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;max-width:640px;margin:0 auto 36px;box-shadow:0 4px 14px rgba(15,23,42,.05)}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;background:#fff;color:var(--text)}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.15)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.check-row{display:flex;align-items:center;gap:10px;margin-bottom:10px;font-size:.95rem}
.check-row input{width:auto;accent-color:var(--primary)}
.btn{display:inline-block;background:var(--primary);color:#fff;border:none;padding:13px 28px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;width:100%;transition:background .15s}
.btn:hover{background:var(--primary-dark)}
.btn-secondary{background:#eef2ff;color:var(--primary-dark);margin-top:10px}
.btn-secondary:hover{background:#e0e7ff}
.result{margin-top:22px;padding:22px;background:#eef2ff;border:1px dashed var(--primary);border-radius:10px;text-align:center;display:none}
.result.show{display:block}
.result .big{font-size:2.1rem;font-weight:800;color:var(--primary-dark);margin-bottom:6px}
.result p{margin:4px 0}
/* Content + FAQ */
.content-block{max-width:700px;margin:0 auto 36px}
.content-block h2{margin:26px 0 12px;font-size:1.4rem}
.content-block ol,.content-block ul{padding-left:22px;margin-bottom:12px}
.content-block li{margin-bottom:6px}
.faq{max-width:700px;margin:0 auto 40px}
.faq h2{text-align:center;margin-bottom:18px;font-size:1.4rem}
.faq details{background:#fff;border:1px solid var(--border);border-radius:10px;margin-bottom:10px;padding:15px 18px}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin-top:8px;color:var(--muted);font-size:.95rem}
.related{max-width:1100px;margin:0 auto 40px}
.related h2{text-align:center;margin-bottom:18px;font-size:1.4rem}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;margin-top:60px;padding:48px 0 0}
.footer-inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px}
.footer-inner .logo{color:#fff}
.footer-inner p{font-size:.9rem;color:#94a3b8;margin-top:8px}
.footer-inner h4{color:#fff;margin-bottom:12px;font-size:1rem}
.footer-inner a{color:#94a3b8;text-decoration:none;display:block;margin-bottom:8px;font-size:.9rem}
.footer-inner a:hover{color:#fff}
.footer-bottom{text-align:center;padding:20px;border-top:1px solid #1e293b;margin-top:36px;font-size:.85rem;color:#64748b}
.qr-img{display:block;margin:14px auto;max-width:220px;border:1px solid var(--border);border-radius:8px;background:#fff;padding:8px}
textarea#textInput{min-height:140px;resize:vertical}
.output-box{background:#f1f5f9;border:1px solid var(--border);border-radius:8px;padding:14px;margin-top:14px;word-break:break-word;min-height:60px;font-size:.95rem}
/* Sponsored banner */
.ad-banner{background:linear-gradient(135deg,#f59e0b,#ef4444);color:#fff;border-radius:var(--radius);padding:30px 24px;text-align:center;margin:36px 0;position:relative;box-shadow:0 10px 26px rgba(239,68,68,.25)}
.ad-label{position:absolute;top:10px;right:14px;font-size:.68rem;background:rgba(0,0,0,.28);padding:3px 10px;border-radius:999px;text-transform:uppercase;letter-spacing:.6px}
.ad-banner h3{margin-bottom:8px;font-size:1.3rem}
.ad-banner p{opacity:.93;margin-bottom:18px}
.ad-cta{display:inline-block;background:#fff;color:#dc2626;font-weight:700;padding:12px 34px;border-radius:999px;text-decoration:none;transition:transform .15s}
.ad-cta:hover{transform:scale(1.04)}
@media(max-width:640px){
  .main-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 20px;border-bottom:1px solid var(--border);gap:14px}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hero h1{font-size:1.8rem}
  .form-row{grid-template-columns:1fr}
  .tool-head h1{font-size:1.6rem}
}