:root{--bg-primary: #0b0f19;--bg-secondary: #111827;--bg-card: rgba(17, 24, 39, .75);--bg-card-hover: rgba(31, 41, 55, .85);--bg-card-solid: #1e293b;--bg-input: #1f2937;--bg-glass: rgba(15, 23, 42, .65);--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--border-color: rgba(255, 255, 255, .08);--border-focus: #6366f1;--border-hover: rgba(255, 255, 255, .16);--primary-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);--accent-blue: #38bdf8;--accent-indigo: #6366f1;--accent-purple: #a855f7;--accent-green: #34d399;--accent-amber: #fbbf24;--accent-red: #f87171;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .25);--shadow-md: 0 8px 24px rgba(0, 0, 0, .35);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .45);--shadow-glow: 0 0 25px rgba(99, 102, 241, .35);--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-smooth: .35s cubic-bezier(.16, 1, .3, 1);--font-main: "Outfit", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--max-width: 1200px}[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: rgba(255, 255, 255, .85);--bg-card-hover: rgba(241, 245, 249, .95);--bg-card-solid: #f1f5f9;--bg-input: #f1f5f9;--bg-glass: rgba(255, 255, 255, .8);--text-primary: #0f172a;--text-secondary: #334155;--text-muted: #475569;--border-color: rgba(0, 0, 0, .08);--border-focus: #4f46e5;--border-hover: rgba(0, 0, 0, .16);--accent-green: #047857;--accent-amber: #b45309;--accent-red: #dc2626;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .04);--shadow-md: 0 8px 24px rgba(0, 0, 0, .08);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .12);--shadow-glow: 0 0 25px rgba(99, 102, 241, .2)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-main);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;transition:background-color var(--transition-normal),color var(--transition-normal);background-image:radial-gradient(at 0% 0%,rgba(99,102,241,.12) 0px,transparent 50%),radial-gradient(at 100% 100%,rgba(56,189,248,.08) 0px,transparent 50%);background-attachment:fixed}a{color:inherit;text-decoration:none}img,svg{display:block;max-width:100%}button,input,select{font-family:inherit;font-size:inherit}.container{width:100%;max-width:var(--max-width);margin-left:auto;margin-right:auto;padding-left:1.25rem;padding-right:1.25rem}.gradient-text{background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.badge{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .85rem;border-radius:var(--radius-full);font-size:.825rem;font-weight:600;background:#6366f11f;color:var(--accent-blue);border:1px solid rgba(99,102,241,.25);margin-bottom:1rem}.badge-dot{width:8px;height:8px;border-radius:50%;background-color:var(--accent-green);box-shadow:0 0 8px var(--accent-green);animation:pulse-dot 2s infinite}@keyframes pulse-dot{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.3);opacity:.7}}.site-header{position:sticky;top:0;z-index:100;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);background-color:var(--bg-glass);border-bottom:1px solid var(--border-color);transition:all var(--transition-normal)}.header-wrapper{display:flex;align-items:center;justify-content:space-between;height:70px}.logo-link{display:flex;align-items:center;gap:.5rem;transition:transform var(--transition-fast)}.logo-link:hover{transform:scale(1.02)}.logo-img{height:38px;width:auto}.nav-menu{display:flex;align-items:center;gap:.5rem;list-style:none}.nav-item{position:relative}.nav-link{display:inline-flex;align-items:center;gap:.35rem;padding:.5rem .85rem;border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--text-primary);background-color:var(--border-color)}.dropdown{position:relative}.dropdown-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:220px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:.5rem;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(8px);transition:all var(--transition-fast);z-index:110}.dropdown:hover .dropdown-menu,.dropdown:focus-within .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-item{display:flex;align-items:center;gap:.6rem;padding:.6rem .75rem;border-radius:var(--radius-sm);font-size:.875rem;color:var(--text-secondary);transition:all var(--transition-fast)}.dropdown-item:hover{background:var(--bg-card-solid);color:var(--text-primary);transform:translate(4px)}.format-pill{font-size:.75rem;font-weight:700;padding:.15rem .4rem;border-radius:4px;background:#6366f126;color:var(--accent-blue)}.header-actions{display:flex;align-items:center;gap:.75rem}.lang-btn,.theme-toggle-btn{background:var(--bg-card-solid);border:1px solid var(--border-color);color:var(--text-primary);padding:.45rem .75rem;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;gap:.4rem;font-size:.85rem;font-weight:600;transition:all var(--transition-fast)}.lang-btn:hover,.theme-toggle-btn:hover{border-color:var(--border-hover);background:var(--bg-card-hover)}.mobile-menu-btn{display:none;background:transparent;border:none;color:var(--text-primary);font-size:1.5rem;cursor:pointer;padding:.25rem}.ad-container{display:block;width:100%;max-width:var(--max-width);margin:1.5rem auto;padding:0 1rem;text-align:center;box-sizing:border-box;clear:both;position:relative;z-index:1;min-height:105px}.ad-label{font-size:.55rem;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);opacity:.5;margin-bottom:.35rem;display:block;font-weight:500;text-align:center;height:12px;line-height:12px}.ad-slot{display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius-md);overflow:hidden;box-sizing:border-box;margin-left:auto;margin-right:auto;flex-shrink:0}.ad-slot iframe{border-radius:var(--radius-sm);border:none!important;background:transparent;display:block;margin:0 auto}.ad-slot-leaderboard{width:728px;height:90px;max-width:100%;aspect-ratio:728 / 90}.ad-slot-rectangle{width:300px;height:250px;max-width:100%;aspect-ratio:300 / 250}.ad-slot-footer{width:728px;height:90px;max-width:100%;aspect-ratio:728 / 90}.ad-slot-mobile{width:320px;height:50px;max-width:100%;aspect-ratio:320 / 50}.ad-desktop{display:flex!important}.ad-mobile{display:none!important}@media(max-width:768px){.ad-container{margin:1rem auto;padding:0 .5rem;min-height:65px}.ad-desktop{display:none!important}.ad-mobile{display:flex!important}}.hero-section{padding:2.5rem 0 1.5rem;text-align:center}.hero-title{font-size:clamp(2rem,5vw,3.25rem);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:1rem}.hero-subtitle{font-size:clamp(1rem,2vw,1.25rem);color:var(--text-secondary);max-width:680px;margin:0 auto 2rem;line-height:1.5}.converter-card{background:var(--bg-card);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:1.75rem;box-shadow:var(--shadow-lg);position:relative;overflow:hidden;transition:border-color var(--transition-normal)}.converter-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--primary-gradient)}.dropzone{border:2px dashed rgba(99,102,241,.4);border-radius:var(--radius-md);padding:3.5rem 1.5rem;text-align:center;background:#6366f108;cursor:pointer;transition:all var(--transition-smooth);position:relative}.dropzone:hover,.dropzone.drag-active{border-color:var(--accent-indigo);background:#6366f114;transform:translateY(-2px);box-shadow:var(--shadow-glow)}.dropzone-icon{width:64px;height:64px;margin:0 auto 1.25rem;display:flex;align-items:center;justify-content:center;border-radius:50%;background:#6366f126;color:var(--accent-blue);transition:transform var(--transition-smooth)}.dropzone:hover .dropzone-icon{transform:scale(1.1) rotate(5deg)}.dropzone-title{font-size:1.35rem;font-weight:700;margin-bottom:.5rem}.dropzone-desc{font-size:.95rem;color:var(--text-secondary);margin-bottom:1.5rem}.dropzone-shortcuts{font-size:.8rem;color:var(--text-muted);display:flex;align-items:center;justify-content:center;gap:.5rem;margin-top:1rem}.kbd{background:var(--bg-card-solid);border:1px solid var(--border-color);padding:.15rem .4rem;border-radius:4px;font-family:monospace;font-size:.75rem;font-weight:600}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:var(--primary-gradient);color:#fff;font-weight:700;padding:.85rem 1.75rem;border-radius:var(--radius-md);border:none;cursor:pointer;box-shadow:0 4px 15px #6366f166;transition:all var(--transition-normal)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #6366f18c}.btn-primary:active{transform:translateY(0)}.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:var(--bg-card-solid);color:var(--text-primary);border:1px solid var(--border-color);font-weight:600;padding:.75rem 1.25rem;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}.btn-success{background:linear-gradient(135deg,#10b981,#059669);color:#fff;box-shadow:0 4px 15px #10b98159}.btn-success:hover{box-shadow:0 6px 20px #10b98180;transform:translateY(-2px)}.btn-danger{background:#ef44441f;color:var(--accent-red);border:1px solid rgba(239,68,68,.3)}.btn-danger:hover{background:#ef444440}.btn-sm{padding:.4rem .8rem;font-size:.825rem;border-radius:var(--radius-sm)}.settings-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1.25rem;padding:1.25rem;background:var(--bg-card-solid);border:1px solid var(--border-color);border-radius:var(--radius-md);margin-top:1.5rem}.setting-group{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.setting-label{font-size:.875rem;font-weight:600;color:var(--text-secondary)}.select-custom{background:var(--bg-input);color:var(--text-primary);border:1px solid var(--border-color);padding:.5rem 2rem .5rem .85rem;border-radius:var(--radius-sm);font-weight:600;font-size:.875rem;cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .6rem center;background-size:1rem;transition:border-color var(--transition-fast)}.select-custom:focus{outline:none;border-color:var(--accent-indigo)}.slider-container{display:flex;align-items:center;gap:.75rem}.range-slider{-webkit-appearance:none;appearance:none;width:130px;height:6px;border-radius:3px;background:var(--bg-input);outline:none}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent-indigo);cursor:pointer;box-shadow:0 0 8px #6366f199;transition:transform var(--transition-fast)}.range-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.slider-value{font-size:.825rem;font-weight:700;color:var(--accent-blue);min-width:36px}.queue-section{margin-top:1.5rem;display:none}.queue-section.has-files{display:block;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.queue-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;padding:0 .5rem}.queue-count{font-size:.95rem;font-weight:700;color:var(--text-primary)}.file-list{display:flex;flex-direction:column;gap:.75rem;max-height:480px;overflow-y:auto;padding-right:.25rem}.file-list::-webkit-scrollbar{width:6px}.file-list::-webkit-scrollbar-track{background:transparent}.file-list::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}.file-item{display:grid;grid-template-columns:56px 1fr auto auto auto;align-items:center;gap:1rem;background:var(--bg-card-solid);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:.75rem 1rem;transition:all var(--transition-fast);position:relative;overflow:hidden}.file-item:hover{border-color:var(--border-hover);background:var(--bg-card-hover)}.file-thumb-wrapper{width:52px;height:52px;border-radius:var(--radius-sm);overflow:hidden;background:var(--bg-input);display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative}.file-thumb{width:100%;height:100%;object-fit:cover}.file-info{min-width:0}.file-name{font-size:.9rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:.2rem}.file-meta{font-size:.775rem;color:var(--text-muted);display:flex;align-items:center;gap:.5rem}.file-status-badge{font-size:.75rem;font-weight:600;padding:.2rem .5rem;border-radius:var(--radius-full)}.status-waiting{background:#94a3b826;color:var(--text-muted)}.status-converting{background:#38bdf826;color:var(--accent-blue);animation:pulse-dot 1.5s infinite}.status-done{background:#10b98126;color:var(--accent-green)}.status-error{background:#ef444426;color:var(--accent-red)}.savings-tag{font-weight:700;color:var(--accent-green)}.file-actions{display:flex;align-items:center;gap:.5rem}.progress-bar-container{position:absolute;bottom:0;left:0;width:100%;height:3px;background:transparent}.progress-bar-fill{height:100%;width:0%;background:var(--primary-gradient);transition:width .2s ease}.global-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid var(--border-color)}.global-actions-left{display:flex;align-items:center;gap:.75rem}.global-actions-right{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.content-section{padding:4rem 0}.section-header{text-align:center;max-width:720px;margin:0 auto 3rem}.section-title{font-size:clamp(1.75rem,3.5vw,2.35rem);font-weight:800;margin-bottom:.75rem;letter-spacing:-.01em}.section-desc{font-size:1.05rem;color:var(--text-secondary)}.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.75rem}.step-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2rem 1.5rem;position:relative;transition:transform var(--transition-normal),border-color var(--transition-normal)}.step-card:hover{transform:translateY(-4px);border-color:var(--border-hover);box-shadow:var(--shadow-md)}.step-num{font-size:3rem;font-weight:900;line-height:1;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;opacity:.4;margin-bottom:1rem}.step-title{font-size:1.2rem;font-weight:700;margin-bottom:.5rem}.step-desc{font-size:.925rem;color:var(--text-secondary);line-height:1.55}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.feature-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1.75rem;transition:all var(--transition-fast)}.feature-card:hover{background:var(--bg-card-hover);border-color:var(--accent-indigo)}.feature-icon{font-size:2rem;margin-bottom:1rem}.feature-title{font-size:1.1rem;font-weight:700;margin-bottom:.4rem}.feature-desc{font-size:.9rem;color:var(--text-secondary)}.table-wrapper{overflow-x:auto;border:1px solid var(--border-color);border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow-md);margin:2rem 0}.comparison-table{width:100%;border-collapse:collapse;text-align:left;font-size:.925rem}.comparison-table th,.comparison-table td{padding:1.1rem 1.25rem;border-bottom:1px solid var(--border-color)}.comparison-table th{background:var(--bg-card-solid);font-weight:700;color:var(--text-primary);font-size:.85rem;text-transform:uppercase;letter-spacing:.5px}.comparison-table tr:last-child td{border-bottom:none}.comparison-table tr:hover td{background:var(--bg-card-hover)}.faq-list{display:flex;flex-direction:column;gap:1rem;max-width:860px;margin:0 auto}.faq-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);overflow:hidden;transition:border-color var(--transition-fast)}.faq-item:hover,.faq-item[open]{border-color:var(--accent-indigo)}.faq-question{padding:1.25rem 1.5rem;font-size:1.05rem;font-weight:700;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;user-select:none}.faq-question::-webkit-details-marker{display:none}.faq-chevron{transition:transform var(--transition-fast);color:var(--accent-blue)}.faq-item[open] .faq-chevron{transform:rotate(180deg)}.faq-answer{padding:0 1.5rem 1.25rem;font-size:.95rem;color:var(--text-secondary);line-height:1.6}.site-footer{margin-top:auto;background:#0f172a;border-top:1px solid rgba(255,255,255,.12);padding:3.5rem 0 2rem;color:#cbd5e1}[data-theme=light] .site-footer{background:#f1f5f9;border-top:1px solid #cbd5e1;color:#334155}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2.5rem;margin-bottom:2.5rem}.footer-brand p{font-size:.9rem;color:#cbd5e1;margin-top:.75rem;max-width:320px;line-height:1.6}[data-theme=light] .footer-brand p{color:#334155}.footer-col h3,.footer-col .footer-title,.footer-col h4{font-size:.95rem;font-weight:700;margin-bottom:1rem;color:#f8fafc}[data-theme=light] .footer-col h3,[data-theme=light] .footer-col .footer-title,[data-theme=light] .footer-col h4{color:#0f172a}.footer-links{list-style:none;display:flex;flex-direction:column;gap:.6rem}.footer-links a{font-size:.875rem;color:#cbd5e1;text-decoration:none;transition:color var(--transition-fast)}[data-theme=light] .footer-links a{color:#1e293b}.footer-links a:hover{color:#38bdf8;text-decoration:underline}[data-theme=light] .footer-links a:hover{color:#2563eb;text-decoration:underline}.badge-secure{color:#4ade80;font-weight:600;font-size:.875rem;display:inline-flex;align-items:center;gap:.25rem}[data-theme=light] .badge-secure{color:#15803d}.footer-bottom{padding-top:1.5rem;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;font-size:.875rem;color:#cbd5e1}[data-theme=light] .footer-bottom{border-top:1px solid #cbd5e1;color:#334155}.footer-bottom div,.footer-bottom span{color:#cbd5e1}[data-theme=light] .footer-bottom div,[data-theme=light] .footer-bottom span{color:#334155}.footer-bottom a{color:#cbd5e1;text-decoration:underline;font-weight:500;transition:color var(--transition-fast)}[data-theme=light] .footer-bottom a{color:#0f172a}.footer-bottom a:hover{color:#38bdf8}[data-theme=light] .footer-bottom a:hover{color:#2563eb}.modal-backdrop{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000000d9;backdrop-filter:blur(8px);z-index:1000;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:all var(--transition-normal)}.modal-backdrop.open{opacity:1;visibility:visible}.modal-content{max-width:90vw;max-height:85vh;position:relative;display:flex;flex-direction:column;align-items:center}.modal-img{max-width:100%;max-height:80vh;border-radius:var(--radius-md);box-shadow:var(--shadow-lg);object-fit:contain}.modal-close-btn{position:absolute;top:-40px;right:0;background:transparent;border:none;color:#fff;font-size:1.8rem;cursor:pointer}.toast-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:1100;display:flex;flex-direction:column;gap:.5rem}.toast{background:var(--bg-card-solid);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);padding:.85rem 1.25rem;border-radius:var(--radius-md);font-size:.875rem;font-weight:600;display:flex;align-items:center;gap:.6rem;color:var(--text-primary);animation:slideIn .25s ease;min-width:250px}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.toast.toast-success{border-left:4px solid var(--accent-green)}.toast.toast-error{border-left:4px solid var(--accent-red)}.toast.toast-info{border-left:4px solid var(--accent-blue)}@media(max-width:992px){.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:768px){.header-wrapper{height:60px}.nav-menu{display:none}.mobile-menu-btn{display:block}.nav-menu.mobile-open{display:flex;flex-direction:column;position:absolute;top:60px;left:0;width:100%;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);padding:1rem;box-shadow:var(--shadow-lg)}.file-item{grid-template-columns:48px 1fr;grid-template-rows:auto auto;gap:.5rem}.file-actions{grid-column:1 / -1;justify-content:space-between;margin-top:.5rem}.global-actions{flex-direction:column;align-items:stretch}.global-actions-right{justify-content:stretch}.global-actions-right button{flex:1}.footer-grid{grid-template-columns:1fr}}
