*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
    --primary:#6366F1;--primary-dark:#4F46E5;--primary-light:#818CF8;
    --violet:#8B5CF6;--emerald:#10B981;--amber:#F59E0B;--red:#EF4444;
    --gray-50:#F9FAFB;--gray-100:#F3F4F6;--gray-200:#E5E7EB;--gray-300:#D1D5DB;
    --gray-400:#9CA3AF;--gray-500:#6B7280;--gray-600:#4B5563;--gray-700:#374151;--gray-800:#1F2937;--gray-900:#111827;
    --radius:12px;--radius-lg:16px;--radius-xl:24px;
    --shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);
    --shadow-lg:0 10px 25px rgba(0,0,0,.1),0 6px 10px rgba(0,0,0,.08);
    --shadow-xl:0 20px 50px rgba(99,102,241,.15),0 8px 16px rgba(0,0,0,.06);
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;color:var(--gray-800);line-height:1.6;background:#fff;-webkit-font-smoothing:antialiased}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
a{text-decoration:none;color:inherit}
button{cursor:pointer;border:none;background:none;font-family:inherit}
img{max-width:100%}

/* Header */
header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--gray-100)}
header nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{display:flex}
.logo-text{font-size:1.35rem;font-weight:800;color:var(--gray-900)}
.logo-ai{color:var(--primary)}
.nav-links{display:flex;gap:32px;list-style:none;align-items:center}
.nav-links>li{position:relative}
.nav-links a{font-size:.9rem;font-weight:500;color:var(--gray-500);transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-dropdown>a{display:inline-flex;align-items:center;gap:4px}
.nav-dropdown .chevron-down{width:14px;height:14px;transition:transform .2s}
.nav-dropdown:hover .chevron-down{transform:rotate(180deg)}
.dropdown-mega{position:absolute;top:100%;right:-60px;width:520px;background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:24px 28px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;opacity:0;visibility:hidden;transform:translateY(8px);transition:all .2s ease;z-index:200;pointer-events:none}
.nav-dropdown:hover .dropdown-mega{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto}
.dropdown-mega h4{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--gray-400);margin-bottom:10px;padding-bottom:6px;border-bottom:1px solid var(--gray-100)}
.dropdown-mega a{display:flex;align-items:center;gap:8px;padding:5px 0;font-size:.82rem;font-weight:500;color:var(--gray-600);transition:color .15s}
.dropdown-mega a:hover{color:var(--primary)}
.dropdown-mega .dm-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}
.dm-red{background:#EF4444}.dm-blue{background:#3B82F6}.dm-green{background:#10B981}.dm-amber{background:#F59E0B}
.dm-violet{background:#8B5CF6}.dm-cyan{background:#0EA5E9}.dm-slate{background:#64748B}

/* Hero */
#hero{padding:140px 0 80px;text-align:center;background:linear-gradient(180deg,#F5F3FF 0%,#fff 100%)}
.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;border-radius:999px;background:#EEF2FF;color:var(--primary);font-size:.82rem;font-weight:600;margin-bottom:24px}
.badge-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
#hero h1{font-size:3.8rem;font-weight:800;line-height:1.1;letter-spacing:-.03em;color:var(--gray-900);margin-bottom:20px}
.gradient-text{background:linear-gradient(135deg,var(--primary),var(--violet));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.15rem;color:var(--gray-500);max-width:560px;margin:0 auto 40px;line-height:1.7}
.hero-stats{display:flex;align-items:center;justify-content:center;gap:32px;margin-bottom:40px}
.stat{text-align:center}
.stat strong{display:block;font-size:1.5rem;font-weight:800;color:var(--gray-900)}
.stat span{font-size:.8rem;color:var(--gray-400);font-weight:500}
.stat-divider{width:1px;height:40px;background:var(--gray-200)}
.cta-button{display:inline-flex;align-items:center;padding:14px 32px;background:linear-gradient(135deg,var(--primary),var(--violet));color:#fff;font-size:1rem;font-weight:600;border-radius:999px;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 15px rgba(99,102,241,.4)}
.cta-button:hover{transform:translateY(-2px);box-shadow:0 6px 25px rgba(99,102,241,.5)}

/* Tool hero (subpages) */
.tool-hero{padding:120px 0 60px;text-align:center;background:linear-gradient(180deg,#F5F3FF 0%,#fff 100%)}
.tool-hero h1{font-size:2.6rem;font-weight:800;line-height:1.2;letter-spacing:-.03em;color:var(--gray-900);margin-bottom:20px}
.tool-hero .hero-sub{max-width:560px;margin:0 auto}

/* SEO content */
.seo-content{padding:60px 0}
.seo-content h2{font-size:1.4rem;font-weight:700;margin:32px 0 14px;color:var(--gray-900)}
.seo-content h2:first-child{margin-top:0}
.seo-content p,.seo-content li{font-size:1rem;color:var(--gray-600);line-height:1.7;margin-bottom:14px}
.seo-content ol{margin:0 0 16px 24px;padding:0}

/* Related tools */
.related-tools{padding:60px 0 40px}

/* Section common */
.section-title{font-size:2.2rem;font-weight:800;text-align:center;color:var(--gray-900);letter-spacing:-.02em}
.section-sub{text-align:center;color:var(--gray-500);margin:10px auto 48px;max-width:500px;font-size:1rem}

/* Tools Grid */
#tools{padding:80px 0 40px}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.tool-card{background:var(--gray-50);border:2px solid transparent;border-radius:var(--radius-lg);padding:28px 20px;text-align:center;cursor:pointer;transition:all .25s}
.tool-card:hover{border-color:var(--gray-200);background:#fff;box-shadow:var(--shadow)}
.tool-card.active{border-color:var(--primary);background:#fff;box-shadow:var(--shadow-xl)}
.tool-card h3{font-size:1rem;font-weight:700;margin:16px 0 6px;color:var(--gray-800)}
.tool-card p{font-size:.82rem;color:var(--gray-400);line-height:1.5}
.tool-icon{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:10px;font-size:.75rem;font-weight:800;color:#fff}
.pdf-icon{background:linear-gradient(135deg,#EF4444,#DC2626)}
.word-icon{background:linear-gradient(135deg,#3B82F6,#2563EB)}
.excel-icon{background:linear-gradient(135deg,#10B981,#059669)}
.tool-arrow{display:inline-flex;margin:0 6px;color:var(--gray-300)}
.tool-card.active .tool-arrow{color:var(--primary)}
a.tool-card{text-decoration:none;color:inherit;display:block}

/* Converter */
#converter{padding:20px 0 80px}
.converter-box{max-width:640px;margin:0 auto;background:#fff;border-radius:var(--radius-xl);border:1px solid var(--gray-200);padding:40px;box-shadow:var(--shadow-lg)}
.converter-header{margin-bottom:28px}
.converter-title-row{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.converter-title-row h2{font-size:1.5rem;font-weight:700}
.ai-badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--violet));color:#fff;font-size:.7rem;font-weight:600;letter-spacing:.03em}
#converter-desc{color:var(--gray-500);font-size:.92rem}

/* Upload Area */
.upload-area{border:2px dashed var(--gray-200);border-radius:var(--radius-lg);padding:40px;text-align:center;transition:all .25s;position:relative}
.upload-area.dragover{border-color:var(--primary);background:#F5F3FF}
.upload-area.has-file{border-style:solid;border-color:var(--gray-200);padding:20px 24px}
.upload-text{font-size:1rem;font-weight:600;color:var(--gray-700);margin:16px 0 4px}
.upload-or{font-size:.8rem;color:var(--gray-400);margin:4px 0 12px}
.upload-btn{display:inline-flex;align-items:center;padding:10px 24px;background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--radius);font-size:.88rem;font-weight:500;color:var(--gray-700);cursor:pointer;transition:all .2s}
.upload-btn:hover{background:var(--gray-100);border-color:var(--gray-300)}
.upload-hint{font-size:.78rem;color:var(--gray-400);margin-top:12px}

/* File Info */
.file-info{display:flex;align-items:center;gap:14px;text-align:left}
.file-details{flex:1;min-width:0}
.file-name{display:block;font-size:.92rem;font-weight:600;color:var(--gray-800);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-size{font-size:.8rem;color:var(--gray-400)}
.file-remove{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;color:var(--gray-400);transition:all .2s}
.file-remove:hover{background:var(--gray-100);color:var(--red)}

/* Progress */
.progress-area{margin:20px 0}
.progress-bar{height:6px;background:var(--gray-100);border-radius:999px;overflow:hidden}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--violet));border-radius:999px;transition:width .3s}
.progress-text{font-size:.82rem;color:var(--gray-500);margin-top:10px;text-align:center}

/* Convert Button */
.convert-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:14px;margin-top:20px;background:linear-gradient(135deg,var(--primary),var(--violet));color:#fff;font-size:1rem;font-weight:600;border-radius:var(--radius);transition:all .25s;box-shadow:0 4px 12px rgba(99,102,241,.3)}
.convert-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 20px rgba(99,102,241,.4)}
.convert-btn:disabled{opacity:.45;cursor:not-allowed;transform:none}

/* Result */
.result-area,.error-area{text-align:center;padding:20px 0}
.result-area h3{font-size:1.25rem;font-weight:700;margin:16px 0 4px;color:var(--gray-900)}
.result-meta{font-size:.85rem;color:var(--gray-400);margin-bottom:20px}
.download-btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--emerald);color:#fff;font-size:1rem;font-weight:600;border-radius:var(--radius);transition:all .2s;box-shadow:0 4px 12px rgba(16,185,129,.3)}
.download-btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(16,185,129,.4)}
.convert-another{display:block;margin:16px auto 0;background:none;color:var(--gray-500);font-size:.88rem;font-weight:500;padding:8px;transition:color .2s}
.convert-another:hover{color:var(--primary)}

/* Error */
.error-area h3{font-size:1.25rem;font-weight:700;margin:16px 0 4px;color:var(--gray-900)}
.error-msg{font-size:.88rem;color:var(--gray-500);margin-bottom:16px}

/* Features */
#features{padding:80px 0;background:var(--gray-50)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:#fff;border:1px solid var(--gray-100);border-radius:var(--radius-lg);padding:28px 24px;transition:box-shadow .25s}
.feature-card:hover{box-shadow:var(--shadow-lg)}
.feature-card .feature-icon{margin-bottom:16px}
.feature-card h3{font-size:1rem;font-weight:700;margin-bottom:8px;color:var(--gray-800)}
.feature-card p{font-size:.86rem;color:var(--gray-500);line-height:1.6}

/* How It Works */
#how-it-works{padding:80px 0}
.steps{display:flex;align-items:flex-start;justify-content:center;gap:0}
.step{text-align:center;flex:1;max-width:260px;padding:0 20px}
.step-number{width:56px;height:56px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--violet));color:#fff;font-size:1.35rem;font-weight:800;margin-bottom:16px}
.step h3{font-size:1.05rem;font-weight:700;margin-bottom:8px;color:var(--gray-800)}
.step p{font-size:.86rem;color:var(--gray-500);line-height:1.6}
.step-connector{width:60px;height:2px;background:var(--gray-200);margin-top:28px;flex-shrink:0}

/* FAQ */
#faq{padding:80px 0;background:var(--gray-50)}
.faq-list{max-width:680px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--gray-200)}
.faq-question{display:flex;align-items:center;justify-content:space-between;width:100%;padding:20px 0;font-size:.95rem;font-weight:600;color:var(--gray-800);text-align:left}
.faq-chevron{transition:transform .25s;flex-shrink:0;color:var(--gray-400)}
.faq-item.open .faq-chevron{transform:rotate(180deg);color:var(--primary)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.open .faq-answer{max-height:300px}
.faq-answer p{padding:0 0 20px;font-size:.88rem;color:var(--gray-500);line-height:1.7}
.faq-answer a{color:var(--primary);font-weight:500}

/* Footer */
footer{padding:60px 0 0;background:var(--gray-900);color:var(--gray-400)}
.footer-top{display:flex;gap:60px;padding-bottom:40px;border-bottom:1px solid var(--gray-700)}
.footer-brand{flex:1}
.footer-brand .logo-text{color:#fff}
.footer-brand p{margin-top:12px;font-size:.88rem;line-height:1.6}
.footer-links{display:flex;gap:48px}
.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col h4{font-size:.82rem;font-weight:600;color:var(--gray-300);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}
.footer-col a{font-size:.88rem;color:var(--gray-400);transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{padding:24px 0;text-align:center;font-size:.82rem}

/* New tool icon colors */
.img-icon{background:linear-gradient(135deg,#F59E0B,#D97706)}
.compress-icon{background:linear-gradient(135deg,#8B5CF6,#7C3AED)}
.split-icon{background:linear-gradient(135deg,#6366F1,#4F46E5);font-size:.65rem}
.rotate-icon{background:linear-gradient(135deg,#0EA5E9,#0284C7);font-size:.7rem}
.wm-icon{background:linear-gradient(135deg,#64748B,#475569);font-style:italic}
.lock-icon{background:linear-gradient(135deg,#EF4444,#DC2626);font-size:1.1rem}
.unlock-icon{background:linear-gradient(135deg,#10B981,#059669);font-size:1.1rem}

/* Tools category heading */
.tools-category{font-size:1rem;font-weight:700;color:var(--gray-500);text-transform:uppercase;letter-spacing:.06em;margin:36px 0 14px;padding-left:4px}
.tools-category:first-of-type{margin-top:0}

/* Extra options panel */
.extra-options{margin-top:16px}
.option-group{margin-bottom:12px}
.option-group label{display:block;font-size:.82rem;font-weight:600;color:var(--gray-600);margin-bottom:4px}
.option-group input,.option-group select{width:100%;padding:10px 14px;border:1px solid var(--gray-200);border-radius:var(--radius);font-size:.92rem;color:var(--gray-800);font-family:inherit;transition:border-color .2s}
.option-group input:focus,.option-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.1)}

/* Hidden */
.hidden{display:none!important}

/* Responsive */
@media(max-width:900px){
    .tools-grid{grid-template-columns:repeat(2,1fr)}
    .features-grid{grid-template-columns:repeat(2,1fr)}
    #hero h1,.tool-hero h1{font-size:2.2rem}
    .hero-stats{gap:20px}
    .steps{flex-direction:column;align-items:center;gap:24px}
    .step-connector{width:2px;height:32px;margin:0}
    .footer-top{flex-direction:column;gap:40px}
    .footer-links{gap:32px}
    .dropdown-mega{right:-120px;width:420px;grid-template-columns:1fr 1fr;padding:20px}
}
@media(max-width:600px){
    .tools-grid{grid-template-columns:1fr}
    .features-grid{grid-template-columns:1fr}
    #hero h1,.tool-hero h1{font-size:1.75rem}
    .hero-stats{flex-direction:column;gap:12px}
    .stat-divider{width:40px;height:1px}
    .nav-links{gap:16px}
    .converter-box{padding:24px}
    .upload-area{padding:24px}
    .footer-links{flex-direction:column;gap:24px}
    .dropdown-mega{right:-20px;left:auto;width:calc(100vw - 40px);grid-template-columns:1fr;padding:16px;max-height:70vh;overflow-y:auto}
}