/* ========== RESET & VARIABLES ========== */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#E8423F;
  --primary-dark:#C4312E;
  --primary-light:#FFF0F0;
  --secondary:#1A1A2E;
  --bg:#FAFAFA;
  --card-bg:#FFF;
  --text:#1A1A2E;
  --text-muted:#64748B;
  --border:#E2E8F0;
  --radius:16px;
  --shadow:0 1px 3px rgba(0,0,0,.04),0 4px 12px rgba(0,0,0,.06);
  --shadow-hover:0 4px 12px rgba(0,0,0,.08),0 8px 24px rgba(0,0,0,.1);
  --green:#22C55E;
  --blue:#3B82F6;
  --purple:#8B5CF6;
  --orange:#F97316;
  --pink:#EC4899;
  --teal:#14B8A6;
  --indigo:#6366F1;
  --yellow:#EAB308;
}
body{font-family:'DM Sans',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto}

/* ========== HEADER ========== */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:6px}
.logo-icon-pdf{display:flex;align-items:center;line-height:0}
.logo-text{font-weight:800;font-size:20px;color:var(--secondary)}

/* Nav Main */
.nav-main{display:flex;gap:0;align-items:center;height:64px}
.nav-item{position:relative;height:100%;display:flex;align-items:center}
.nav-item>a{padding:0 16px;font-size:13px;font-weight:600;color:var(--secondary);text-transform:uppercase;letter-spacing:.3px;height:100%;display:flex;align-items:center;transition:color .2s;border-bottom:3px solid transparent}
.nav-item>a:hover,.nav-item.open>a{color:var(--primary);border-bottom-color:var(--primary)}
.nav-item>a .arrow{margin-left:4px;font-size:10px;transition:transform .2s}
.nav-item.open>a .arrow{transform:rotate(180deg)}

/* Mega Menu */
.mega-dropdown{display:none;position:absolute;top:100%;left:50%;transform:translateX(-50%);background:#fff;border:1px solid var(--border);border-top:3px solid var(--primary);border-radius:0 0 12px 12px;padding:28px 36px;box-shadow:0 12px 40px rgba(0,0,0,.1);z-index:200}
.nav-item.open .mega-dropdown{display:block}
.mega-wide{min-width:860px}
.mega-cols{display:grid;gap:28px}
.mega-col h4{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--text-muted);margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.mega-col a{display:flex;align-items:center;gap:8px;padding:6px 0;font-size:13px;color:var(--text);font-weight:500;transition:color .15s}
.mega-col a:hover{color:var(--primary)}
.mega-col a .mi{width:20px;height:20px;border-radius:4px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.mega-col a .mi svg{width:12px;height:12px}

/* Nav Right */
.nav-right{margin-left:auto;display:flex;align-items:center;gap:16px}
.nav-right a{font-size:14px;font-weight:500;color:var(--text-muted)}
.nav-right a:hover{color:var(--text)}
.btn-register{background:var(--primary)!important;color:#fff!important;padding:8px 22px;border-radius:8px;font-weight:600;font-size:14px}
.btn-register:hover{background:var(--primary-dark)!important}

/* Mobile menu */
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.menu-toggle svg{width:24px;height:24px;stroke:var(--secondary)}
.nav-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;z-index:100}
.nav-overlay.show{display:block}

/* ========== HERO ========== */
.hero{text-align:center;padding:70px 24px 40px;max-width:850px;margin:0 auto}
.hero h1{font-size:40px;font-weight:800;line-height:1.2;margin-bottom:18px;color:var(--secondary)}
.hero p{font-size:16px;color:var(--text-muted);max-width:640px;margin:0 auto;line-height:1.7}

/* ========== FILTER TABS ========== */
.filter-bar{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:36px auto 40px;max-width:1000px;padding:0 24px}
.filter-btn{padding:9px 20px;border-radius:50px;font-size:13px;font-weight:600;border:1.5px solid var(--border);background:#fff;color:var(--text-muted);cursor:pointer;transition:all .2s;font-family:inherit;white-space:nowrap}
.filter-btn:hover{border-color:#ccc;color:var(--text)}
.filter-btn.active{background:var(--secondary);color:#fff;border-color:var(--secondary)}

/* ========== TOOLS GRID ========== */
.tools-section{max-width:1200px;margin:0 auto;padding:0 24px 80px}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.tool-card{background:#fff;border:1px solid #eee;border-radius:14px;padding:28px 22px 22px;text-align:left;cursor:pointer;transition:all .25s;display:flex;flex-direction:column;gap:10px}
.tool-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:#ddd}
.tool-card .tc-icon{width:50px;height:50px;border-radius:12px;display:flex;align-items:center;justify-content:center}
.tool-card .tc-icon svg{width:24px;height:24px}
.tool-card h3{font-size:15px;font-weight:700;color:var(--secondary)}
.tool-card p{font-size:12.5px;color:var(--text-muted);line-height:1.5}
.tool-card.hidden{display:none}

/* ========== TOOL PAGE ========== */
.tool-main{max-width:800px;margin:0 auto;padding:60px 24px 80px;text-align:center}
.tool-main h1{font-size:36px;font-weight:700;margin-bottom:12px;color:var(--secondary)}
.tool-main h1 svg{vertical-align:middle;margin-right:8px}
.tool-main>p{font-size:16px;color:var(--text-muted);margin-bottom:40px}

/* Upload */
.upload-area{background:#fff;border:2px dashed var(--border);border-radius:var(--radius);padding:60px 40px;cursor:pointer;transition:all .3s;position:relative}
.upload-area:hover,.upload-area.dragover{border-color:var(--primary);background:var(--primary-light)}
.upload-icon{width:72px;height:72px;background:var(--primary-light);border-radius:20px;display:flex;align-items:center;justify-content:center;margin:0 auto 20px}
.upload-area h2{font-size:20px;font-weight:600;margin-bottom:8px}
.upload-area p{font-size:14px;color:var(--text-muted);margin-bottom:20px}
.upload-btn{display:inline-block;background:var(--primary);color:#fff;padding:12px 32px;border-radius:10px;font-weight:600;font-size:15px;border:none;cursor:pointer;font-family:inherit}
.upload-btn:hover{background:var(--primary-dark)}
.upload-area input[type="file"]{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}

/* File list */
.file-list{margin-top:20px;text-align:left}
.file-item{background:#fff;border-radius:12px;padding:16px 20px;margin-bottom:8px;border:1px solid var(--border);display:flex;align-items:center;gap:12px}
.file-pdf-icon{width:44px;height:44px;background:var(--primary-light);border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.file-details{flex:1;min-width:0}
.file-name{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-size{font-size:13px;color:var(--text-muted)}
.file-remove{width:32px;height:32px;border-radius:8px;border:1px solid var(--border);background:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.file-remove:hover{background:#FEE;border-color:var(--primary)}

/* Options */
.options-section{display:none;margin-top:24px;background:#fff;border-radius:var(--radius);padding:28px;border:1px solid var(--border);text-align:left}
.options-section h3{font-size:18px;font-weight:600;margin-bottom:20px;text-align:center}
.quality-options{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.quality-option{border:2px solid var(--border);border-radius:12px;padding:20px 16px;cursor:pointer;transition:all .2s;text-align:center}
.quality-option:hover{border-color:var(--primary)}
.quality-option.active{border-color:var(--primary);background:var(--primary-light)}
.quality-option .q-label{font-weight:600;font-size:15px;margin-bottom:4px}
.quality-option .q-desc{font-size:12px;color:var(--text-muted)}

/* Action/Download buttons */
.action-btn{display:none;width:100%;padding:16px;background:var(--primary);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;margin-top:24px;font-family:inherit}
.action-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}
.action-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
.progress-area{display:none;margin-top:24px}
.progress-bar-outer{width:100%;height:8px;background:#E5E7EB;border-radius:4px;overflow:hidden;margin-bottom:12px}
.progress-bar-inner{height:100%;background:var(--primary);border-radius:4px;width:0;transition:width .3s}
.progress-text{font-size:14px;color:var(--text-muted)}
.result-area{display:none;margin-top:32px;background:#fff;border-radius:var(--radius);padding:32px;border:1px solid var(--border)}
.result-success{width:64px;height:64px;background:#F0FDF4;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.result-title{font-size:20px;font-weight:700;margin-bottom:8px;color:var(--green)}
.result-info{font-size:14px;color:var(--text-muted);margin-bottom:20px}
.download-btn{display:inline-block;padding:14px 40px;background:var(--green);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;margin-top:16px;font-family:inherit}
.download-btn:hover{filter:brightness(1.05);transform:translateY(-1px)}
.restart-btn{display:inline-block;padding:10px 24px;background:transparent;color:var(--text-muted);border:1px solid var(--border);border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;margin-top:12px;margin-left:12px;font-family:inherit}
.restart-btn:hover{border-color:var(--text);color:var(--text)}

/* ========== FEATURES ========== */
.features-section{background:#fff;padding:80px 24px}
.features-inner{max-width:1000px;margin:0 auto;text-align:center}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;margin-top:48px}
.feature-item{text-align:center}
.feature-icon{width:64px;height:64px;border-radius:16px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;margin:0 auto 20px}
.feature-item h3{font-size:18px;font-weight:600;margin-bottom:8px}
.feature-item p{font-size:14px;color:var(--text-muted);line-height:1.6}

/* ========== INSTITUTIONAL PAGES ========== */
.page-content{max-width:800px;margin:0 auto;padding:60px 24px 80px}
.page-content h1{font-size:36px;font-weight:700;margin-bottom:8px;color:var(--secondary)}
.page-content .update-date{font-size:13px;color:var(--text-muted);margin-bottom:32px}
.page-content h2{font-size:22px;font-weight:600;margin:32px 0 12px;color:var(--secondary)}
.page-content h3{font-size:18px;font-weight:600;margin:24px 0 8px;color:var(--secondary)}
.page-content p{font-size:15px;color:var(--text-muted);line-height:1.8;margin-bottom:16px}
.page-content ul,.page-content ol{margin:0 0 16px 24px;color:var(--text-muted);font-size:15px;line-height:1.8}
.page-content li{margin-bottom:8px}
.page-content a{color:var(--primary);text-decoration:underline}
.highlight-box{background:var(--primary-light);border-left:4px solid var(--primary);padding:20px 24px;border-radius:0 12px 12px 0;margin:24px 0}
.highlight-box p{color:var(--secondary)!important;font-weight:500;margin:0!important}

/* Contact form */
.contact-form{max-width:500px;margin:24px 0}
.contact-form label{display:block;font-size:14px;font-weight:600;color:var(--secondary);margin-bottom:6px}
.contact-form input,.contact-form textarea,.contact-form select{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;font-size:15px;font-family:inherit;margin-bottom:16px;transition:border-color .2s}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--primary);outline:none}
.contact-form textarea{resize:vertical;min-height:120px}
.contact-form button{background:var(--primary);color:#fff;padding:14px 32px;border:none;border-radius:10px;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit}
.contact-form button:hover{background:var(--primary-dark)}

/* ========== FOOTER ========== */
.site-footer{background:var(--secondary);color:#fff;padding:60px 24px 0}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;padding-bottom:48px}
.footer-brand{display:flex;flex-direction:column;gap:16px}
.footer-brand p{font-size:14px;color:rgba(255,255,255,.6);line-height:1.6;max-width:300px}
.footer-col h4{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:rgba(255,255,255,.4);margin-bottom:16px}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,.7);padding:4px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:24px 0;display:flex;align-items:center;justify-content:space-between}
.footer-bottom p{font-size:13px;color:rgba(255,255,255,.4)}
.footer-social{display:flex;gap:16px}
.footer-social a{color:rgba(255,255,255,.5);transition:color .2s}
.footer-social a:hover{color:#fff}
.footer-social svg{width:20px;height:20px}

/* ========== SEO CONTENT ========== */
.seo-block{max-width:800px;margin:0 auto;padding:60px 24px;text-align:left}
.seo-block h2{font-size:24px;font-weight:700;margin-bottom:16px;color:var(--secondary)}
.seo-block p{font-size:15px;color:var(--text-muted);line-height:1.7;margin-bottom:12px}

/* ========== RESPONSIVE ========== */
@media(max-width:1024px){
  .nav-main{display:none}
  .menu-toggle{display:block}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .hero h1{font-size:28px}
  .hero p{font-size:15px}
  .tools-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .tool-card{padding:18px 14px}
  .features-grid{grid-template-columns:1fr}
  .filter-btn{padding:7px 14px;font-size:12px}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:16px;text-align:center}
  .quality-options{grid-template-columns:1fr}
  .tool-main h1{font-size:28px}
  .upload-area{padding:40px 24px}
  .page-content h1{font-size:28px}
}

@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}