*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden;}:root{--primary-color:#6366f1;--primary-dark:#4f46e5;--secondary-color:hsl(258,90%,66%);--accent-color:#ec4899;--bg-color:#f8fafc;--card-bg:#ffffff;--text-color:#1e293b;--text-light:#64748b;--border-color:#e2e8f0;--success-color:#10b981;--warning-color:#f59e0b;--error-color:#ef4444;--shadow:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:var(--text-color);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;-webkit-font-smoothing:antialiased;padding:clamp(1rem,3vw,2rem)clamp(0.75rem,2vw,1rem);}img,svg,iframe,video,canvas{max-width:100%;height:auto;display:block;}.back-btn{display:inline-flex;align-items:center;justify-content:center;gap:0.5rem;padding:0.75rem 1.5rem;background:var(--card-bg);color:var(--primary-color);text-decoration:none;border-radius:12px;font-weight:600;font-size:clamp(0.9rem,2.5vw,1rem);box-shadow:var(--shadow);transition:all 0.3s ease;margin:clamp(2rem,5vw,4rem)clamp(0.5rem,3vw,2rem)clamp(1.5rem,3vw,2rem);position:relative;overflow:hidden;border:2px solid transparent;width:fit-content;min-height:48px;}.back-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(99,102,241,0.1),transparent);transition:left 0.5s ease;}.back-btn:hover::before{left:100%;}.back-btn:hover{background:var(--primary-color);color:white;transform:translateX(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary-color);}.back-btn:active{transform:translateX(-3px)scale(0.98);}.container{max-width:1200px;margin:0 auto;padding:clamp(1rem,2vw,2rem);flex:1;width:100%;}main.container{background:var(--card-bg);border-radius:16px;box-shadow:var(--shadow-lg);margin-top:clamp(1rem,3vw,2rem);margin-bottom:clamp(1rem,3vw,2rem);padding:clamp(1.25rem,3vw,2.5rem);width:100%;}main h1{font-size:clamp(1.5rem,5vw,2rem);color:var(--primary-color);margin-bottom:0.5rem;text-align:center;line-height:1.3;overflow-wrap:break-word;}.subtitle{text-align:center;color:var(--text-light);font-size:clamp(1rem,3vw,1.1rem);margin-bottom:clamp(1.5rem,3vw,2rem);}.tool-card{background:var(--bg-color);border-radius:12px;padding:clamp(1.25rem,3vw,2rem);margin-bottom:clamp(1.5rem,3vw,2rem);box-shadow:var(--shadow);width:100%;}.upload-section{margin-bottom:clamp(1.25rem,2.5vw,1.5rem);}.upload-area{border:3px dashed var(--primary-color);border-radius:12px;padding:clamp(2rem,4vw,3rem)clamp(1rem,2.5vw,2rem);text-align:center;background:var(--card-bg);transition:all 0.3s ease;cursor:pointer;width:100%;}.upload-area:hover{border-color:var(--primary-dark);background:linear-gradient(135deg,rgba(99,102,241,0.05)0%,rgba(168,85,247,0.05)100%);transform:translateY(-2px);}.upload-area.drag-over{border-color:var(--success-color);background:rgba(16,185,129,0.1);}.upload-icon{font-size:clamp(3rem,7vw,4rem);margin-bottom:1rem;animation:bounce 2s infinite;display:block;}@keyframes bounce{0%,100%{transform:translateY(0);}50%{transform:translateY(-10px);}}.upload-area h3{color:var(--text-color);margin-bottom:0.5rem;font-size:clamp(1.1rem,3vw,1.25rem);}.upload-area p{color:var(--text-light);font-size:clamp(0.85rem,2.5vw,0.9rem);margin-bottom:clamp(1rem,2.5vw,1.5rem);}.browse-btn{padding:clamp(0.65rem,2vw,0.75rem)clamp(1.25rem,3vw,2rem);background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:white;border:none;border-radius:8px;font-size:clamp(0.9rem,2.5vw,1rem);font-weight:600;cursor:pointer;transition:all 0.3s ease;box-shadow:var(--shadow);min-height:44px;}.browse-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.preview-section{margin-bottom:clamp(1.25rem,2.5vw,1.5rem);}.video-preview{background:var(--card-bg);border-radius:12px;padding:clamp(1rem,2.5vw,1.5rem);box-shadow:var(--shadow);width:100%;}.video-preview video{width:100%;max-width:600px;height:auto;border-radius:8px;margin:0 auto 1rem;display:block;box-shadow:var(--shadow);}.file-info{background:var(--bg-color);padding:clamp(0.75rem,2vw,1rem);border-radius:8px;margin-top:clamp(0.75rem,2vw,1rem);}.file-info p{margin:0.5rem 0;color:var(--text-color);font-size:clamp(0.9rem,2.5vw,0.95rem);word-break:break-word;}.file-info strong{color:var(--primary-color);margin-right:0.5rem;}.progress-section{margin-bottom:clamp(1.25rem,2.5vw,1.5rem);}.progress-container{background:var(--card-bg);padding:clamp(1rem,2.5vw,1.5rem);border-radius:12px;box-shadow:var(--shadow);width:100%;}.progress-bar{width:100%;height:clamp(20px,4vw,30px);background:var(--bg-color);border-radius:15px;overflow:hidden;box-shadow:inset 0 2px 4px rgba(0,0,0,0.1);margin-bottom:1rem;}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color)0%,var(--success-color)100%);width:0%;transition:width 0.3s ease;border-radius:15px;position:relative;overflow:hidden;}.progress-fill::after{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);animation:shimmer 1.5s infinite;}@keyframes shimmer{0%{transform:translateX(-100%);}100%{transform:translateX(100%);}}.progress-text{text-align:center;color:var(--text-color);font-weight:600;font-size:clamp(0.9rem,2.5vw,1rem);}.action-buttons{display:flex;flex-direction:column;gap:clamp(0.75rem,2vw,1rem);justify-content:center;width:100%;}@media(min-width:640px){.action-buttons{flex-direction:row;}}.action-btn{padding:clamp(0.85rem,2.5vw,1rem)clamp(1rem,2.5vw,2rem);border:none;border-radius:8px;font-size:clamp(0.95rem,2.5vw,1rem);font-weight:600;cursor:pointer;transition:all 0.3s ease;box-shadow:var(--shadow);flex:1;min-width:0;min-height:48px;}.extract-btn{background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:white;}.extract-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.extract-btn:disabled{opacity:0.6;cursor:not-allowed;transform:none;}.download-btn{background:linear-gradient(135deg,var(--success-color)0%,#059669 100%);color:white;}.download-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.reset-btn{background:linear-gradient(135deg,var(--text-light)0%,var(--text-color)100%);color:white;}.reset-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}.how-to-use{margin-top:clamp(2rem,4vw,3rem);}.how-to-use h2{color:var(--primary-color);text-align:center;margin-bottom:clamp(1.5rem,3vw,2rem);font-size:clamp(1.5rem,4vw,2rem);}.steps-grid{display:grid;grid-template-columns:1fr;gap:clamp(1rem,2.5vw,1.5rem);margin-bottom:clamp(2rem,4vw,3rem);}.step-card{background:linear-gradient(135deg,var(--card-bg)0%,var(--bg-color)100%);padding:clamp(1.5rem,3vw,2rem);border-radius:12px;box-shadow:var(--shadow);transition:all 0.3s ease;border:2px solid transparent;min-width:0;}.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-color);}.step-number{width:clamp(40px,8vw,50px);height:clamp(40px,8vw,50px);background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:white;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:clamp(1.25rem,3vw,1.5rem);font-weight:700;margin-bottom:1rem;box-shadow:var(--shadow);}.step-card h3{color:var(--text-color);margin-bottom:0.5rem;font-size:clamp(1.1rem,3vw,1.25rem);}.step-card p{color:var(--text-light);font-size:clamp(0.9rem,2.5vw,1rem);line-height:1.6;}.features-section{background:var(--bg-color);padding:clamp(1.25rem,3vw,2rem);border-radius:12px;margin-bottom:clamp(1.5rem,3vw,2rem);width:100%;}.features-section h3{color:var(--primary-color);margin-bottom:clamp(1rem,2.5vw,1.5rem);font-size:clamp(1.25rem,3vw,1.5rem);}.features-list{list-style:none;display:grid;grid-template-columns:1fr;gap:clamp(0.75rem,2vw,1rem);}.features-list li{padding:clamp(0.6rem,2vw,0.75rem);background:var(--card-bg);border-radius:8px;color:var(--text-color);font-size:clamp(0.9rem,2.5vw,1rem);box-shadow:var(--shadow);transition:all 0.3s ease;}.features-list li:hover{transform:translateX(5px);box-shadow:var(--shadow-lg);}.faq-section{background:var(--card-bg);border-radius:16px;padding:clamp(1.25rem,3vw,2rem);margin:2rem 0;box-shadow:var(--shadow-lg);width:100%;}.faq-section h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:clamp(1.25rem,3.5vw,1.5rem);text-align:center;}.faq-section > div{background:var(--bg-color);border-radius:12px;padding:clamp(1rem,2.5vw,1.5rem);margin-bottom:1rem;border-left:4px solid var(--primary-color);transition:all 0.3s ease;}.faq-section > div:hover{border-color:var(--primary-dark);box-shadow:var(--shadow);}.faq-section h3{font-size:clamp(1rem,2.5vw,1.1rem);color:var(--text-color);margin-bottom:0.75rem;font-weight:600;line-height:1.4;}.faq-section p{margin:0;color:var(--text-light);line-height:1.7;font-size:clamp(0.9rem,2.5vw,0.95rem);overflow-wrap:break-word;}.seo-article{background:var(--card-bg);border-radius:16px;padding:clamp(1.25rem,3vw,2rem);margin:2rem 0;box-shadow:var(--shadow-lg);width:100%;}.seo-article h2{color:var(--primary-color);margin-bottom:1.5rem;font-size:clamp(1.25rem,3.5vw,1.5rem);line-height:1.3;}.seo-article p{margin-bottom:1.25rem;line-height:1.7;color:var(--text-color);font-size:clamp(0.9rem,2.5vw,1rem);overflow-wrap:break-word;}.seo-article strong{color:var(--primary-dark);font-weight:600;}.seo-article ul{margin:0 0 1.25rem clamp(1rem,3vw,1.5rem);line-height:1.8;color:var(--text-color);font-size:clamp(0.9rem,2.5vw,1rem);}.pro-footer{background:linear-gradient(135deg,#1e293b 0%,#334155 100%);color:#e2e8f0;padding:clamp(2rem,4vw,3rem)clamp(0.75rem,2.5vw,1rem)clamp(0.75rem,2vw,1rem);margin-top:auto;width:100%;}.footer-container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:clamp(1.5rem,3vw,2rem);margin-bottom:clamp(1.5rem,3vw,2rem);}.footer-section h3,.footer-section h4{color:white;margin-bottom:1rem;font-size:clamp(1.1rem,3vw,1.25rem);}.footer-brand{text-align:center;}.footer-brand img{width:clamp(120px,35vw,200px);height:auto;border-radius:12px;margin-bottom:1rem;margin-top:clamp(1rem,3vw,2rem);}.footer-brand p{color:#94a3b8;font-size:clamp(0.85rem,2.5vw,0.95rem);margin-top:0rem;}.footer-section ul{list-style:none;}.footer-section ul li{margin-bottom:0.5rem;}.footer-section a{color:#cbd5e1;text-decoration:none;transition:color 0.3s ease;display:inline-block;padding:0.15rem 0;min-height:44px;}.footer-section a:hover{color:var(--primary-color);}.contact p{margin-bottom:0.5rem;color:#cbd5e1;}.contact small{display:block;color:#94a3b8;font-size:0.8rem;margin-top:-0.25rem;margin-bottom:0.5rem;}.footer-bottom{border-top:1px solid #475569;padding-top:clamp(1rem,2.5vw,1.5rem);text-align:center;}.footer-bottom p{color:#94a3b8;font-size:clamp(0.8rem,2.5vw,0.9rem);margin-bottom:0.5rem;}.copyright-warning{font-size:clamp(0.7rem,2.5vw,0.8rem);color:#64748b;margin-top:0.5rem;}@media(min-width:640px){.steps-grid{grid-template-columns:repeat(2,1fr);}.features-list{grid-template-columns:repeat(2,1fr);}.footer-container{grid-template-columns:repeat(2,1fr);}main h1{font-size:2.25rem;}.faq-section,.seo-article{padding:clamp(1.75rem,3.5vw,2.5rem);}}@media(min-width:768px){.steps-grid{grid-template-columns:repeat(3,1fr);}.logo-name{font-size:1.5rem;}nav a{font-size:1rem;padding:0.6rem 1.25rem;}main h1{font-size:2.5rem;}.tool-card{padding:clamp(2rem,3vw,2.5rem);}.footer-container{grid-template-columns:repeat(3,1fr);text-align:left;}.footer-brand{text-align:left;}}@media(min-width:1024px){.container{padding:2.5rem 2rem;}main.container{padding:3rem 2.5rem;}main h1{font-size:3rem;}.subtitle{font-size:1.2rem;}}@media(max-width:767px){.faq-section,.seo-article{padding:1.25rem;}.faq-section h2,.seo-article h2{font-size:1.25rem;}.faq-section h3{font-size:1rem;}.seo-article p{font-size:0.95rem;}}@media(max-width:479px){body{padding:1rem 0.5rem;}.back-btn{margin:2rem 0.5rem 1.5rem;width:100%;justify-content:center;}.tool-card{padding:1.25rem 1rem;border-radius:12px;}.upload-area{padding:2rem 1rem;border-width:2px;}.upload-area h3{font-size:1.1rem;}.action-btn{min-width:100%;}.steps-grid,.features-list{gap:1rem;}.step-card{padding:1.5rem 1rem;}}@keyframes fadeIn{from{opacity:0;transform:translateY(20px);}to{opacity:1;transform:translateY(0);}}main{animation:fadeIn 0.6s ease;}.step-card{animation:fadeIn 0.6s ease backwards;}.step-card:nth-child(1){animation-delay:0.1s;}.step-card:nth-child(2){animation-delay:0.2s;}.step-card:nth-child(3){animation-delay:0.3s;}*:focus{outline:2px solid var(--primary-color);outline-offset:2px;}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;}}.blog-cta{background:linear-gradient(135deg,rgba(99,102,241,0.1)0%,rgba(139,92,246,0.1)100%);border:2px solid var(--primary-color);border-radius:12px;padding:clamp(1.5rem,4vw,2.5rem);text-align:center;width:100%;margin:clamp(1.5rem,3vw,2rem)0;}.blog-cta-content h3{font-size:clamp(1.35rem,3.5vw,1.8rem);color:var(--text-color);margin-bottom:1rem;font-weight:700;line-height:1.3;}.blog-cta-content p{font-size:clamp(0.95rem,2.5vw,1.1rem);color:var(--text-light);margin-bottom:1.5rem;line-height:1.8;}.blog-btn{display:inline-flex;align-items:center;justify-content:center;padding:clamp(0.85rem,2.5vw,1rem)clamp(1.5rem,4vw,2.5rem);background:linear-gradient(135deg,var(--primary-color)0%,var(--secondary-color)100%);color:white;text-decoration:none;border-radius:10px;font-weight:700;font-size:clamp(1rem,2.5vw,1.05rem);box-shadow:var(--shadow);transition:all 0.3s ease;min-height:48px;}.blog-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}