:root{
  --indigo-50:#eef2ff;--indigo-100:#e0e7ff;--indigo-500:#6366f1;--indigo-600:#4f46e5;--indigo-700:#4338ca;
  --slate-50:#f8fafc;--slate-100:#f1f5f9;--slate-200:#e2e8f0;--slate-400:#94a3b8;--slate-500:#64748b;
  --slate-700:#334155;--slate-800:#1e293b;--slate-900:#0f172a;
  --radius:14px;--shadow:0 4px 24px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Inter,system-ui,-apple-system,Arial,sans-serif;background:var(--slate-50);color:var(--slate-800);line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--slate-200)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:1180px;margin:0 auto;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--slate-900)}
.brand .logo-badge{background:linear-gradient(135deg,var(--indigo-600),var(--indigo-500));color:#fff;width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem}
nav.main-nav{display:flex;gap:22px;font-weight:600;font-size:.95rem}
nav.main-nav a:hover{color:var(--indigo-600)}
.search-wrap{position:relative;flex:1;max-width:320px}
.search-wrap input{width:100%;padding:9px 14px;border-radius:999px;border:1px solid var(--slate-200);background:var(--slate-50);font-size:.9rem}
.search-wrap input:focus{outline:2px solid var(--indigo-500);background:#fff}
.search-dropdown{position:absolute;top:110%;left:0;right:0;background:#fff;border:1px solid var(--slate-200);border-radius:12px;box-shadow:var(--shadow);max-height:320px;overflow:auto;display:none;z-index:60}
.search-dropdown.open{display:block}
.search-dropdown a{display:flex;gap:10px;align-items:center;padding:10px 14px;font-size:.9rem;border-bottom:1px solid var(--slate-100)}
.search-dropdown a:last-child{border-bottom:none}
.search-dropdown a:hover{background:var(--indigo-50)}
.search-empty{padding:14px;font-size:.85rem;color:var(--slate-500)}
.menu-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer}

/* Hero */
.hero{background:linear-gradient(135deg,var(--indigo-700),var(--indigo-500));color:#fff;padding:64px 0 56px;text-align:center}
.hero h1{font-size:2.4rem;margin:0 0 12px;font-weight:800}
.hero p{font-size:1.1rem;opacity:.92;max-width:640px;margin:0 auto 26px}
.hero .search-wrap{max-width:520px;margin:0 auto}
.hero .search-wrap input{padding:14px 20px;font-size:1rem}

/* Tool grid */
.section-title{font-size:1.6rem;font-weight:800;margin:48px 0 22px;color:var(--slate-900)}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px;margin-bottom:40px}
.tool-card{background:#fff;border:1px solid var(--slate-200);border-radius:var(--radius);padding:22px;transition:.15s;display:flex;flex-direction:column;gap:8px}
.tool-card:hover{box-shadow:var(--shadow);border-color:var(--indigo-500);transform:translateY(-2px)}
.tool-card .icon{font-size:1.8rem}
.tool-card h3{margin:0;font-size:1.05rem;color:var(--slate-900)}
.tool-card p{margin:0;font-size:.88rem;color:var(--slate-500)}

/* Tool page */
.tool-hero{background:#fff;border-bottom:1px solid var(--slate-200);padding:36px 0}
.tool-hero .badge{display:inline-flex;align-items:center;gap:8px;background:var(--indigo-50);color:var(--indigo-700);padding:6px 14px;border-radius:999px;font-size:.8rem;font-weight:700;margin-bottom:10px}
.tool-hero h1{font-size:1.9rem;margin:6px 0 8px;color:var(--slate-900)}
.tool-hero p.lead{color:var(--slate-500);max-width:680px}

.tool-app{background:#fff;border:1px solid var(--slate-200);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin:30px 0}
.dropzone{border:2px dashed var(--slate-200);border-radius:12px;padding:40px 20px;text-align:center;cursor:pointer;transition:.15s;background:var(--slate-50)}
.dropzone.dragover{border-color:var(--indigo-500);background:var(--indigo-50)}
.dropzone strong{color:var(--indigo-600)}
.controls{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin:18px 0}
.controls label{font-size:.85rem;font-weight:600;color:var(--slate-700)}
.controls select,.controls input[type=text],.controls input[type=number]{padding:8px 12px;border:1px solid var(--slate-200);border-radius:8px;font-size:.9rem}
.btn{background:var(--indigo-600);color:#fff;border:none;padding:11px 22px;border-radius:9px;font-weight:700;cursor:pointer;font-size:.92rem}
.btn:hover{background:var(--indigo-700)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.secondary{background:var(--slate-100);color:var(--slate-800)}
.btn.secondary:hover{background:var(--slate-200)}
.progress-wrap{margin:16px 0;display:none}
.progress-bar{height:10px;background:var(--slate-100);border-radius:999px;overflow:hidden}
.progress-bar > div{height:100%;background:var(--indigo-500);width:0%;transition:width .2s}
.progress-label{font-size:.8rem;color:var(--slate-500);margin-top:6px}
video,audio{max-width:100%;border-radius:10px;background:#000}
.preview-row{display:flex;flex-wrap:wrap;gap:20px;margin-top:18px}
.preview-col{flex:1;min-width:260px}
.result-box{margin-top:18px;padding:16px;background:var(--slate-50);border-radius:10px;display:none}
.file-list{list-style:none;padding:0;margin:14px 0;display:flex;flex-direction:column;gap:8px}
.file-list li{display:flex;justify-content:space-between;align-items:center;background:var(--slate-50);padding:8px 12px;border-radius:8px;font-size:.85rem}
.file-list button{background:none;border:none;color:#ef4444;cursor:pointer;font-weight:700}
textarea{width:100%;min-height:220px;padding:12px;border:1px solid var(--slate-200);border-radius:10px;font-family:monospace;font-size:.85rem}

.content-block{max-width:820px;margin:44px auto}
.content-block h2{font-size:1.4rem;margin:28px 0 12px;color:var(--slate-900)}
.content-block p{color:var(--slate-700);margin-bottom:14px}
.faq-item{border-bottom:1px solid var(--slate-200);padding:14px 0}
.faq-item h3{margin:0 0 6px;font-size:1rem;color:var(--slate-900)}
.faq-item p{margin:0;color:var(--slate-500);font-size:.92rem}

.related{margin:40px 0}

/* Footer */
footer.site-footer{background:var(--slate-900);color:var(--slate-400);margin-top:60px;padding:48px 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
.footer-grid h4{color:#fff;font-size:.95rem;margin:0 0 14px}
.footer-grid ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px;font-size:.87rem}
.footer-grid ul a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;margin-top:36px;padding-top:18px;font-size:.8rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.footer-brand{font-weight:800;color:#fff;font-size:1.1rem;margin-bottom:10px;display:block}
.footer-desc{font-size:.87rem;max-width:340px}

.static-page{max-width:820px;margin:50px auto;background:#fff;padding:38px;border-radius:var(--radius);box-shadow:var(--shadow)}
.static-page h1{margin-top:0}
.static-page h2{margin-top:28px}

.ad-slot{max-width:1180px;margin:30px auto;padding:0 20px;text-align:center;color:var(--slate-400);font-size:.75rem}

@media (max-width:820px){
  .footer-grid{grid-template-columns:1fr 1fr}
  nav.main-nav{display:none}
  .menu-toggle{display:block}
  .hero h1{font-size:1.8rem}
}
@media (max-width:520px){
  .footer-grid{grid-template-columns:1fr}
  .search-wrap{max-width:180px}
}