:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#0ea5e9;
  --bg:#f8fafc;
  --surface:#ffffff;
  --text:#0f172a;
  --text-muted:#64748b;
  --border:#e2e8f0;
  --success:#16a34a;
  --danger:#dc2626;
  --radius:12px;
  --shadow:0 1px 3px rgba(0,0,0,.05),0 1px 2px rgba(0,0,0,.03);
  --shadow-lg:0 10px 25px -5px rgba(0,0,0,.08),0 8px 10px -6px rgba(0,0,0,.05);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;
  min-height:100vh;display:flex;flex-direction:column;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}

/* Header */
.site-header{
  background:var(--surface);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:50;box-shadow:var(--shadow);
}
.nav{max-width:1200px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{font-size:22px;font-weight:800;color:var(--text);display:flex;align-items:center;gap:8px}
.logo span{color:var(--primary)}
.logo:hover{text-decoration:none}
.nav-links{display:flex;gap:22px;list-style:none;align-items:center}
.nav-links a{color:var(--text);font-weight:500;font-size:15px}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.menu-toggle{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--text)}

/* Hero */
.hero{
  background:linear-gradient(135deg,#eff6ff 0%,#e0f2fe 100%);
  padding:70px 20px 50px;text-align:center;
}
.hero h1{font-size:clamp(28px,5vw,46px);font-weight:800;margin-bottom:14px;letter-spacing:-.02em}
.hero p{font-size:clamp(15px,2vw,19px);color:var(--text-muted);max-width:680px;margin:0 auto}
.hero .badges{display:flex;justify-content:center;gap:18px;margin-top:26px;flex-wrap:wrap;font-size:14px;color:var(--text-muted)}
.hero .badges span{display:flex;align-items:center;gap:6px}

/* Main */
main{flex:1;width:100%}
.container{max-width:1200px;margin:0 auto;padding:40px 20px}
.section-title{font-size:26px;font-weight:700;margin-bottom:8px;text-align:center}
.section-sub{text-align:center;color:var(--text-muted);margin-bottom:36px}

/* Tool grid */
.tools-grid{
  display:grid;gap:18px;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
}
.tool-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:22px 20px;
  transition:transform .18s,box-shadow .18s,border-color .18s;
  display:flex;flex-direction:column;gap:10px;cursor:pointer;
  color:var(--text);text-decoration:none;
}
.tool-card:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-lg);
  border-color:var(--primary);
  text-decoration:none;
}
.tool-icon{
  width:44px;height:44px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;color:white;
}
.ic-red{background:linear-gradient(135deg,#ef4444,#dc2626)}
.ic-blue{background:linear-gradient(135deg,#3b82f6,#2563eb)}
.ic-green{background:linear-gradient(135deg,#22c55e,#16a34a)}
.ic-purple{background:linear-gradient(135deg,#a855f7,#7c3aed)}
.ic-orange{background:linear-gradient(135deg,#fb923c,#ea580c)}
.ic-teal{background:linear-gradient(135deg,#14b8a6,#0d9488)}
.ic-pink{background:linear-gradient(135deg,#ec4899,#db2777)}
.ic-yellow{background:linear-gradient(135deg,#facc15,#ca8a04)}
.ic-slate{background:linear-gradient(135deg,#64748b,#334155)}
.ic-indigo{background:linear-gradient(135deg,#6366f1,#4338ca)}

.tool-card h3{font-size:17px;font-weight:700}
.tool-card p{font-size:14px;color:var(--text-muted)}

/* Tool page */
.tool-page{padding:36px 20px}
.tool-header{text-align:center;margin-bottom:30px}
.tool-header h1{font-size:clamp(24px,4vw,36px);font-weight:800;margin-bottom:8px}
.tool-header p{color:var(--text-muted);max-width:640px;margin:0 auto}
.back-link{display:inline-block;margin-bottom:14px;font-size:14px;color:var(--text-muted)}

.drop-zone{
  background:var(--surface);border:2px dashed var(--border);
  border-radius:var(--radius);padding:60px 20px;text-align:center;
  transition:border-color .18s,background .18s;cursor:pointer;
}
.drop-zone.drag-over{border-color:var(--primary);background:#eff6ff}
.drop-zone .drop-icon{font-size:52px;margin-bottom:12px;color:var(--primary)}
.drop-zone h2{font-size:20px;font-weight:600;margin-bottom:8px}
.drop-zone p{color:var(--text-muted);margin-bottom:16px;font-size:14px}
.drop-zone input[type=file]{display:none}

.btn{
  background:var(--primary);color:white;border:none;
  padding:12px 26px;border-radius:8px;font-size:16px;font-weight:600;
  cursor:pointer;transition:background .15s,transform .05s;
  display:inline-flex;align-items:center;gap:8px;
}
.btn:hover{background:var(--primary-dark)}
.btn:active{transform:scale(.98)}
.btn:disabled{background:#94a3b8;cursor:not-allowed}
.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg)}
.btn-success{background:var(--success)}
.btn-success:hover{background:#15803d}

.file-list{margin-top:22px;display:flex;flex-direction:column;gap:8px}
.file-item{
  background:var(--surface);border:1px solid var(--border);
  border-radius:8px;padding:12px 14px;
  display:flex;align-items:center;gap:12px;font-size:14px;
}
.file-item .name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-item .size{color:var(--text-muted);font-size:13px}
.file-item .remove{
  background:none;border:none;color:var(--danger);
  font-size:18px;cursor:pointer;padding:4px 8px;border-radius:4px;
}
.file-item .remove:hover{background:#fee2e2}

.actions{margin-top:24px;display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.options{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;margin-top:22px;display:grid;gap:14px;
}
.options label{font-weight:500;font-size:14px;display:block;margin-bottom:4px}
.options select,.options input[type=text],.options input[type=number],.options input[type=password]{
  width:100%;padding:10px 12px;border:1px solid var(--border);
  border-radius:8px;font-size:14px;font-family:inherit;
}
.options .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

.status{
  margin-top:18px;padding:14px 16px;border-radius:8px;
  font-size:14px;display:none;
}
.status.info{background:#dbeafe;color:#1e40af;display:block}
.status.success{background:#dcfce7;color:#166534;display:block}
.status.error{background:#fee2e2;color:#991b1b;display:block}

.progress{
  height:6px;background:var(--border);border-radius:3px;
  overflow:hidden;margin-top:12px;display:none;
}
.progress.active{display:block}
.progress-bar{height:100%;background:var(--primary);width:0%;transition:width .2s}

/* Ad slots */
.ad-slot{
  margin:28px auto;text-align:center;min-height:90px;
  background:var(--surface);border:1px dashed var(--border);
  border-radius:8px;padding:14px;color:var(--text-muted);
  font-size:13px;display:flex;align-items:center;justify-content:center;
  max-width:970px;
}

/* Features */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-top:40px}
.feature{text-align:center;padding:20px}
.feature .icon{font-size:36px;margin-bottom:10px}
.feature h3{font-size:18px;font-weight:700;margin-bottom:6px}
.feature p{color:var(--text-muted);font-size:14px}

/* Footer */
.site-footer{
  background:#0f172a;color:#cbd5e1;padding:40px 20px 20px;margin-top:60px;
}
.footer-content{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px}
.footer-col h4{color:white;margin-bottom:12px;font-size:15px}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:6px}
.footer-col a{color:#cbd5e1;font-size:14px}
.footer-col a:hover{color:white}
.footer-bottom{
  max-width:1200px;margin:30px auto 0;padding-top:20px;
  border-top:1px solid #1e293b;text-align:center;font-size:13px;color:#94a3b8;
}

/* Content pages */
.prose{max-width:760px;margin:0 auto}
.prose h1{font-size:32px;font-weight:800;margin-bottom:18px}
.prose h2{font-size:22px;font-weight:700;margin:26px 0 10px}
.prose p,.prose li{font-size:15px;color:var(--text);margin-bottom:10px}
.prose ul{padding-left:22px;margin-bottom:14px}

/* Responsive */
@media(max-width:720px){
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--surface);flex-direction:column;padding:14px 20px;
    border-bottom:1px solid var(--border);gap:14px;
  }
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
  .options .row{grid-template-columns:1fr}
  .hero{padding:50px 20px 36px}
}