@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;600&family=Space+Grotesk:wght@300;400;500;600;700&display=swap");:root{--primary-gradient:linear-gradient(135deg,#667eea,#764ba2);--secondary-gradient:linear-gradient(135deg,#f093fb,#f5576c);--accent-gradient:linear-gradient(135deg,#4facfe,#00f2fe);--dark-gradient:linear-gradient(135deg,#30cfd0,#330867);--primary:#667eea;--primary-dark:#5a6fd8;--secondary:#764ba2;--accent:#4facfe;--success:#00d4aa;--warning:#ffb800;--error:#f5576c;--info:#00f2fe;--bg-primary:#0a0a0f;--bg-secondary:#151520;--bg-tertiary:#1a1a2e;--bg-card:#16213e;--bg-hover:#1e2847;--text-primary:#fff;--text-secondary:#a0a9c9;--text-muted:#6c7293;--border-color:hsla(0,0%,100%,.1);--shadow-color:rgba(0,0,0,.3);--font-primary:"Inter","Segoe UI",system-ui,sans-serif;--font-mono:"JetBrains Mono","Fira Code","Consolas",monospace;--font-display:"Space Grotesk","Inter",sans-serif;--space-xs:0.25rem;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-2xl:1.5rem;--radius-full:9999px;--shadow-sm:0 1px 3px rgba(0,0,0,.12),0 1px 2px rgba(0,0,0,.24);--shadow-md:0 4px 6px rgba(0,0,0,.1),0 2px 4px rgba(0,0,0,.06);--shadow-lg:0 10px 25px rgba(0,0,0,.15),0 6px 10px rgba(0,0,0,.08);--shadow-xl:0 20px 40px rgba(0,0,0,.2),0 10px 20px rgba(0,0,0,.1);--shadow-glow:0 0 20px rgba(102,126,234,.3);--shadow-glow-purple:0 0 30px rgba(118,75,162,.4);--transition-fast:150ms cubic-bezier(0.4,0,0.2,1);--transition-base:250ms cubic-bezier(0.4,0,0.2,1);--transition-slow:350ms cubic-bezier(0.4,0,0.2,1);--gradient-shift:8s ease-in-out infinite;--float:6s ease-in-out infinite;--pulse:2s ease-in-out infinite}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;scroll-padding-top:80px}body{font-family:var(--font-primary);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;font-size:16px;overflow-x:hidden;transition:all var(--transition-base)}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at 20% 50%,rgba(102,126,234,.1) 0,transparent 50%),radial-gradient(circle at 80% 80%,rgba(118,75,162,.1) 0,transparent 50%),radial-gradient(circle at 40% 20%,rgba(79,172,254,.05) 0,transparent 50%);pointer-events:none;z-index:-1;animation:gradientShift 20s ease-in-out infinite}@keyframes gradientShift{0%,to{opacity:1}50%{opacity:.7}}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;line-height:1.2;margin-bottom:var(--space-md);background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}h1{font-size:clamp(2rem,5vw,3.5rem)}h2{font-size:clamp(1.5rem,4vw,2.5rem)}h3{font-size:clamp(1.25rem,3vw,1.875rem)}h4{font-size:clamp(1.125rem,2.5vw,1.5rem)}p{color:var(--text-secondary);margin-bottom:var(--space-md)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-sm) var(--space-xl);font-family:var(--font-primary);font-weight:600;font-size:.875rem;text-decoration:none;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);position:relative;overflow:hidden;text-transform:uppercase;letter-spacing:.05em}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.2),transparent);transition:left var(--transition-slow)}.btn:hover:before{left:100%}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:var(--shadow-glow)}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg),var(--shadow-glow)}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--bg-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid var(--border-color)}.btn-ghost:hover{color:var(--text-primary);border-color:var(--primary)}.btn-ghost:hover,.card{background:var(--bg-card)}.card{border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:var(--space-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:var(--shadow-md);transition:all var(--transition-base);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--primary-gradient);transform:scaleX(0);transition:transform var(--transition-base)}.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl),var(--shadow-glow-purple);border-color:rgba(102,126,234,.3)}.card:hover:before{transform:scaleX(1)}.nav-header{position:fixed;top:0;left:0;right:0;background:rgba(10,10,15,.95);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color);z-index:1000;padding:var(--space-md) 0}.nav-container{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-lg)}.nav-logo{font-family:var(--font-display);font-size:1.5rem;font-weight:800;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;gap:var(--space-sm)}.nav-logo,.nav-logo-icon{display:flex;align-items:center}.nav-logo-icon{width:40px;height:40px;background:var(--primary-gradient);border-radius:var(--radius-lg);justify-content:center;font-weight:700;color:#fff;font-size:1.25rem}.nav-menu{display:flex;list-style:none;gap:var(--space-sm)}.nav-item{position:relative}.nav-link{display:flex;align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);color:var(--text-secondary);text-decoration:none;border-radius:var(--radius-md);font-weight:500;font-size:.875rem;transition:all var(--transition-base);text-transform:uppercase;letter-spacing:.05em}.nav-link:hover{color:var(--text-primary);background:var(--bg-card);transform:translateY(-1px)}.nav-link.active{color:var(--primary);background:rgba(102,126,234,.1);border:1px solid rgba(102,126,234,.3)}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));grid-gap:var(--space-xl);gap:var(--space-xl);margin:var(--space-2xl) 0}.feature-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-2xl);padding:var(--space-xl);text-align:center;position:relative;overflow:hidden;cursor:pointer;transition:all var(--transition-base)}.feature-card:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(102,126,234,.1) 0,transparent 70%);opacity:0;transition:opacity var(--transition-base);pointer-events:none}.feature-card:hover:before{opacity:1}.feature-card:hover{transform:translateY(-8px) scale(1.02);border-color:var(--primary);box-shadow:var(--shadow-xl),var(--shadow-glow-purple)}.feature-icon{width:80px;height:80px;margin:0 auto var(--space-lg);background:var(--primary-gradient);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:2rem;color:#fff;box-shadow:var(--shadow-glow);transition:all var(--transition-base)}.feature-card:hover .feature-icon{transform:scale(1.1) rotate(5deg);box-shadow:var(--shadow-glow-purple)}.feature-title{font-family:var(--font-display);font-size:1.25rem;font-weight:700;margin-bottom:var(--space-sm);color:var(--text-primary)}.feature-description{color:var(--text-secondary);font-size:.875rem;line-height:1.6;margin-bottom:var(--space-lg)}.feature-formats{display:flex;flex-wrap:wrap;gap:var(--space-xs);justify-content:center;font-family:var(--font-mono);font-size:.75rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.format-badge{background:var(--bg-tertiary);padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);border:1px solid var(--border-color)}.upload-zone{border:2px dashed var(--border-color);border-radius:var(--radius-xl);padding:var(--space-3xl) var(--space-xl);text-align:center;background:var(--bg-card);transition:all var(--transition-base);position:relative;overflow:hidden}.upload-zone:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:var(--accent-gradient);opacity:0;transition:opacity var(--transition-base);pointer-events:none}.upload-zone.dragover,.upload-zone:hover{border-color:var(--accent);background:var(--bg-hover);transform:scale(1.01)}.upload-zone.dragover:before,.upload-zone:hover:before{opacity:.05}.upload-icon{font-size:3rem;margin-bottom:var(--space-lg);background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:float 6s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.progress-container{background:var(--bg-tertiary);height:8px;overflow:hidden;box-shadow:inset 0 2px 4px rgba(0,0,0,.1)}.progress-bar,.progress-container{border-radius:var(--radius-full);position:relative}.progress-bar{height:100%;background:var(--primary-gradient);transition:width var(--transition-base);box-shadow:0 0 10px rgba(102,126,234,.5)}.progress-bar:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);animation:shimmer 2s infinite}@keyframes shimmer{0%{transform:translateX(-100%)}to{transform:translateX(100%)}}.glass-effect{background:rgba(22,33,62,.8);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid hsla(0,0%,100%,.1)}.neon-text{background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 20px rgba(102,126,234,.5)}.pulse-animation{animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}@media (max-width:768px){:root{--space-lg:1rem;--space-xl:1.5rem;--space-2xl:2rem}.nav-container{padding:0 var(--space-md)}.nav-menu{display:none}.mobile-menu-btn{display:block}.feature-grid{grid-template-columns:1fr;gap:var(--space-lg)}.upload-zone{padding:var(--space-2xl) var(--space-lg)}}.loading-dots{display:inline-flex;gap:var(--space-xs)}.loading-dots span{width:8px;height:8px;background:var(--primary);border-radius:50%;animation:bounce 1.4s ease-in-out infinite both}.loading-dots span:first-child{animation-delay:-.32s}.loading-dots span:nth-child(2){animation-delay:-.16s}.loading-dots span:nth-child(3){animation-delay:0s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--primary);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--primary-dark)}.app{min-height:100vh;background:var(--bg-primary);position:relative;overflow-x:hidden}.main-content{padding-top:100px;min-height:calc(100vh - 100px);position:relative;z-index:1}.conversion-flow{max-width:800px;margin:0 auto;padding:var(--space-xl)}.flow-header{display:flex;align-items:center;gap:var(--space-lg);margin-bottom:var(--space-2xl);padding:var(--space-lg);background:var(--bg-card);border-radius:var(--radius-xl)}.back-btn,.flow-header{border:1px solid var(--border-color)}.back-btn{background:transparent;padding:var(--space-sm) var(--space-md)}.tool-info{flex:1 1;text-align:center}.tool-icon{width:60px;height:60px;border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff;margin:0 auto var(--space-md);box-shadow:var(--shadow-glow)}.file-info{flex:1 1;text-align:center}.multi-file-info,.single-file-info,.target-format,.url-display{background:var(--bg-tertiary);padding:var(--space-md);border-radius:var(--radius-md);border:1px solid var(--border-color);margin-bottom:var(--space-sm)}.file-icon-large{font-size:2rem;margin-bottom:var(--space-sm)}.file-size{color:var(--text-muted);font-size:.875rem;margin-left:var(--space-sm)}.action-section{text-align:center;margin-top:var(--space-xl);padding:var(--space-lg);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.large-btn{padding:var(--space-md) var(--space-2xl);font-size:1rem;min-width:200px}.format-selector{margin-top:var(--space-xl);padding:var(--space-xl);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.format-header{text-align:center;margin-bottom:var(--space-xl)}.format-header h3{font-family:var(--font-display);background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-sm)}.format-header p{color:var(--text-secondary)}.format-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));grid-gap:var(--space-md);gap:var(--space-md);margin-bottom:var(--space-xl)}.format-option{padding:var(--space-lg);border:2px solid var(--border-color);border-radius:var(--radius-lg);background:var(--bg-tertiary);color:var(--text-secondary);font-weight:600;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;transition:all var(--transition-base);position:relative;overflow:hidden}.format-option:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:var(--accent-gradient);opacity:.1;transition:left var(--transition-slow)}.format-option:hover:before{left:100%}.format-option:hover{border-color:var(--accent);color:var(--text-primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.format-option.selected{border-color:var(--primary);background:var(--primary);color:#fff;transform:scale(1.05);box-shadow:var(--shadow-glow)}.format-name{font-size:.875rem;font-weight:700}.format-check{position:absolute;top:var(--space-xs);right:var(--space-xs);width:20px;height:20px;background:var(--success);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;animation:checkmark .3s ease-in-out}@keyframes checkmark{0%{transform:scale(0)}50%{transform:scale(1.2)}to{transform:scale(1)}}.format-selected{text-align:center;margin-top:var(--space-lg);padding:var(--space-md);background:linear-gradient(135deg,rgba(102,126,234,.1),rgba(118,75,162,.1));border-radius:var(--radius-lg);border:1px solid var(--primary)}.selected-info{display:flex;align-items:center;justify-content:center;gap:var(--space-md)}.selected-label{color:var(--text-muted);font-size:.875rem}.selected-value{color:var(--text-primary);font-weight:700;font-size:1.125rem;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.file-uploader{margin-top:var(--space-xl)}.upload-zone.has-file{border-color:var(--success);background:rgba(0,212,170,.05)}.selected-file{gap:var(--space-lg);padding:var(--space-lg);text-align:left}.file-icon,.selected-file{display:flex;align-items:center}.file-icon{width:60px;height:60px;background:var(--primary-gradient);border-radius:var(--radius-lg);justify-content:center;font-size:1.5rem;color:#fff}.file-info h4{color:var(--text-primary);margin-bottom:var(--space-xs);font-weight:600}.change-file-btn{padding:var(--space-xs) var(--space-md);font-size:.75rem}.file-preview{margin-top:var(--space-lg);padding:var(--space-lg);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.preview-header{justify-content:space-between;margin-bottom:var(--space-md)}.preview-header,.success-badge{display:flex;align-items:center}.success-badge{width:24px;height:24px;background:var(--success);border-radius:50%;justify-content:center;color:#fff;font-weight:700}.preview-details{display:grid;grid-gap:var(--space-sm);gap:var(--space-sm)}.detail-item{display:flex;justify-content:space-between;padding:var(--space-sm);background:var(--bg-tertiary);border-radius:var(--radius-md)}.detail-label{color:var(--text-muted);font-size:.875rem}.detail-value{color:var(--text-primary);font-weight:500}.error-message{margin-top:var(--space-md);padding:var(--space-md);background:rgba(245,87,108,.1);border:1px solid var(--error);border-radius:var(--radius-md);display:flex;align-items:center;gap:var(--space-sm);color:var(--error)}.error-icon{font-size:1.25rem}.error-text{flex:1 1}.app-footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);padding:var(--space-2xl) 0;margin-top:var(--space-3xl)}.footer-content{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));grid-gap:var(--space-xl);gap:var(--space-xl)}.footer-section h3{color:var(--text-primary);margin-bottom:var(--space-md);font-family:var(--font-display)}.footer-section p{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-md)}.footer-links{display:flex;gap:var(--space-md)}.footer-links a{color:var(--text-muted);text-decoration:none;font-size:.875rem;transition:color var(--transition-base)}.footer-links a:hover{color:var(--primary)}.feature-list{list-style:none}.feature-list li{color:var(--text-secondary);margin-bottom:var(--space-sm);gap:var(--space-sm)}.creator-info,.feature-list li{display:flex;align-items:center}.creator-info{gap:var(--space-md)}.creator-avatar{width:50px;height:50px;background:var(--primary-gradient);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem}.creator-info strong{color:var(--text-primary);display:block;margin-bottom:var(--space-xs)}.creator-info span{color:var(--text-muted);font-size:.875rem;display:block;margin-bottom:var(--space-sm)}.social-links{display:flex;gap:var(--space-sm)}.social-links a{padding:var(--space-xs) var(--space-sm);background:var(--bg-tertiary);border-radius:var(--radius-md);color:var(--text-secondary);text-decoration:none;font-size:.75rem;transition:all var(--transition-base)}.social-links a:hover{background:var(--primary);color:#fff;transform:translateY(-1px)}.footer-bottom{text-align:center;padding:var(--space-xl) 0;border-top:1px solid var(--border-color);color:var(--text-muted);font-size:.875rem}.mobile-menu{position:fixed;top:0;right:-100%;width:80%;max-width:400px;height:100vh;background:var(--bg-card);z-index:2000;transition:right var(--transition-base);overflow-y:auto;box-shadow:var(--shadow-xl)}.mobile-menu.open{right:0}.mobile-menu-content{padding:var(--space-xl)}.mobile-menu-title{font-family:var(--font-display);font-size:1.5rem;margin-bottom:var(--space-xl);text-align:center;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.mobile-menu-item{display:flex;align-items:center;gap:var(--space-md);width:100%;padding:var(--space-lg);background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-lg);margin-bottom:var(--space-md);color:var(--text-secondary);text-align:left;cursor:pointer;transition:all var(--transition-base)}.mobile-menu-item:hover{background:var(--bg-hover);border-color:var(--primary);color:var(--text-primary);transform:translateX(4px)}.mobile-menu-item.active{background:var(--primary);color:#fff;border-color:var(--primary)}.mobile-menu-icon{font-size:1.5rem}.mobile-menu-text{flex:1 1}.mobile-menu-name{display:block;font-weight:600;margin-bottom:var(--space-xs)}.mobile-menu-description{font-size:.875rem;color:var(--text-muted)}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:1999}.menu-icon{font-size:1.25rem}.nav-actions{display:none}.empty-state{text-align:center;padding:var(--space-3xl);max-width:500px;margin:0 auto}.empty-icon{font-size:4rem;margin-bottom:var(--space-xl);animation:float 6s ease-in-out infinite}.empty-state h2{font-family:var(--font-display);background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-md)}.empty-state p{color:var(--text-secondary);margin-bottom:var(--space-xl);line-height:1.6}.stats-section{margin:var(--space-3xl) 0;padding:var(--space-xl);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));grid-gap:var(--space-xl);gap:var(--space-xl);text-align:center}.stat-item{padding:var(--space-lg)}.stat-number{font-family:var(--font-display);font-size:2.5rem;font-weight:800;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-xs)}.stat-label{color:var(--text-muted);font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}.nav-header.scrolled{background:rgba(10,10,15,.98);-webkit-backdrop-filter:blur(30px);backdrop-filter:blur(30px)}.nav-icon{font-size:1.25rem;display:flex;align-items:center;justify-content:center}.nav-link{position:relative}.section-header{text-align:center;margin-bottom:var(--space-3xl)}.section-header h2{font-size:clamp(2rem,5vw,3rem);margin-bottom:var(--space-md)}.section-header p{color:var(--text-secondary);font-size:1.125rem}.feature-card{animation:fadeInUp .6s ease-out forwards;opacity:0;transform:translateY(30px)}@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}}.url-input-container{margin-top:var(--space-xl);padding:var(--space-xl);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.url-input-header{text-align:center;margin-bottom:var(--space-xl)}.input-icon{font-size:2.5rem;margin-bottom:var(--space-md);animation:float 6s ease-in-out infinite}.url-form{max-width:600px;margin:0 auto var(--space-xl)}.input-group{position:relative;margin-bottom:var(--space-xl)}.url-input-field{width:100%;padding:var(--space-lg) var(--space-xl) var(--space-lg) 60px;background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:var(--radius-xl);color:var(--text-primary);font-size:1rem;font-family:var(--font-primary);transition:all var(--transition-base)}.url-input-field:focus{outline:none;border-color:var(--primary);background:var(--bg-primary);box-shadow:0 0 0 3px rgba(102,126,234,.1)}.input-suffix{position:absolute;right:var(--space-lg);top:50%;transform:translateY(-50%);pointer-events:none}.format-selector-group{margin-bottom:var(--space-xl)}.format-label{display:block;color:var(--text-secondary);margin-bottom:var(--space-md);font-weight:500;text-align:center}.format-options{display:flex;gap:var(--space-sm);justify-content:center;flex-wrap:wrap}.format-chip{padding:var(--space-sm) var(--space-lg);background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:var(--radius-full);color:var(--text-secondary);font-weight:600;font-size:.875rem;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;transition:all var(--transition-base)}.format-chip:hover{border-color:var(--primary);color:var(--text-primary);transform:translateY(-2px)}.format-chip.selected{background:var(--primary);border-color:var(--primary);color:#fff;transform:scale(1.05);box-shadow:var(--shadow-glow)}.download-btn{width:100%;padding:var(--space-lg);font-size:1.125rem;display:flex;align-items:center;justify-content:center;gap:var(--space-sm)}.url-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));grid-gap:var(--space-md);gap:var(--space-md);margin:var(--space-xl) 0;text-align:center}.info-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-md);background:var(--bg-tertiary);border-radius:var(--radius-lg);border:1px solid var(--border-color);transition:all var(--transition-base)}.info-item:hover{border-color:var(--success);transform:translateY(-2px)}.info-icon{font-size:1.25rem}.disclaimer{display:flex;align-items:flex-start;gap:var(--space-sm);padding:var(--space-lg);background:rgba(255,184,0,.1);border:1px solid rgba(255,184,0,.3);border-radius:var(--radius-lg);margin-top:var(--space-xl)}.disclaimer-icon{font-size:1.25rem;margin-top:2px}.disclaimer p{color:var(--text-secondary);font-size:.875rem;line-height:1.5;margin:0}.disclaimer strong{color:var(--warning)}.conversion-selector{padding:var(--space-xl)}.feature-arrow{position:absolute;bottom:var(--space-md);right:var(--space-md);color:var(--primary);font-size:1.5rem;opacity:0;transform:translateX(-10px);transition:all var(--transition-base)}.feature-card:hover .feature-arrow{opacity:1;transform:translateX(0)}.conversion-progress{margin-top:var(--space-xl);padding:var(--space-xl);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.progress-header{display:flex;align-items:center;gap:var(--space-lg);margin-bottom:var(--space-xl);text-align:center}.status-icon{position:relative}.icon-main{font-size:2.5rem;display:block;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:pulse 2s ease-in-out infinite}.loading-ring{position:absolute;top:50%;left:50%;width:30px;height:30px;margin:-15px 0 0 -15px;border:3px solid var(--primary);border-top:3px solid transparent;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.progress-container-advanced{margin-top:var(--space-xl)}.progress-info{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.progress-percentage{font-family:var(--font-mono);font-size:1.5rem;font-weight:700;color:var(--primary)}.progress-label{color:var(--text-muted);font-size:.875rem;font-weight:500}.progress-bar-advanced{background:var(--bg-tertiary);height:12px;overflow:hidden;box-shadow:inset 0 2px 4px rgba(0,0,0,.1)}.progress-bar-advanced,.progress-fill-advanced{border-radius:var(--radius-full);position:relative}.progress-fill-advanced{height:100%;background:var(--primary-gradient);transition:width var(--transition-base)}.progress-glow{position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);animation:shimmer 2s infinite}.progress-steps{justify-content:space-between;margin-top:var(--space-lg)}.progress-steps,.step{display:flex;position:relative}.step{flex-direction:column;align-items:center;gap:var(--space-sm);flex:1 1;opacity:.6;transition:all var(--transition-base)}.step:after{content:"";position:absolute;top:25px;left:50%;width:calc(100% - 50px);height:2px;background:var(--border-color);z-index:0}.step:last-child:after{display:none}.step.active{opacity:1;transform:scale(1.05)}.step.active:after{background:var(--primary)}.step.completed{opacity:1}.step-icon{width:50px;height:50px;background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;z-index:1;position:relative;transition:all var(--transition-base)}.step.active .step-icon{background:var(--primary);border-color:var(--primary);color:#fff;transform:scale(1.1);box-shadow:var(--shadow-glow)}.step.completed .step-icon{background:var(--success);border-color:var(--success);color:#fff}.step-text{font-size:.75rem;font-weight:600;color:var(--text-secondary);text-align:center;margin-top:var(--space-xs);text-transform:uppercase;letter-spacing:.05em}.success-animation{text-align:center;margin-top:var(--space-xl);padding:var(--space-lg);background:linear-gradient(135deg,rgba(0,212,170,.1),rgba(0,212,170,.05));border-radius:var(--radius-xl);border:1px solid var(--success)}.success-check{font-size:3rem;margin-bottom:var(--space-md);animation:checkBounce .6s ease-out}@keyframes checkBounce{0%{transform:scale(0) rotate(-45deg)}50%{transform:scale(1.2) rotate(10deg)}to{transform:scale(1) rotate(0deg)}}.success-particles{position:relative;height:40px}.success-particles span{position:absolute;width:6px;height:6px;background:var(--success);border-radius:50%;animation:particleFloat 2s ease-out forwards}.success-particles span:first-child{left:40%;animation-delay:0s}.success-particles span:nth-child(2){left:50%;animation-delay:.2s}.success-particles span:nth-child(3){left:60%;animation-delay:.4s}.success-particles span:nth-child(4){left:70%;animation-delay:.6s}@keyframes particleFloat{0%{transform:translateY(0) scale(0);opacity:1}to{transform:translateY(-30px) scale(0);opacity:0}}.error-container{text-align:center;margin-top:var(--space-xl);padding:var(--space-lg);background:rgba(245,87,108,.1);border:1px solid var(--error);border-radius:var(--radius-xl);animation:errorShake .5s ease-in-out}@keyframes errorShake{0%,to{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}.error-icon-large{font-size:3rem;margin-bottom:var(--space-md)}.error-message{text-align:left}.error-message strong{color:var(--error);display:block;margin-bottom:var(--space-sm);font-size:1.25rem}.error-message p{color:var(--text-secondary);line-height:1.6;margin:0}.progress-tips{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));grid-gap:var(--space-md);gap:var(--space-md);margin-top:var(--space-xl);padding:var(--space-lg);background:var(--bg-tertiary);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.tip-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-md);background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border-color);transition:all var(--transition-base)}.tip-item:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.tip-icon{font-size:1.25rem}.tip-text{font-size:.875rem;color:var(--text-secondary);font-weight:500}@media (max-width:768px){.nav-menu{position:fixed;top:100%;left:0;right:0;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-direction:column;gap:0;padding:var(--space-md) 0;transform:translateY(-100%);opacity:0;visibility:hidden;transition:all var(--transition-base)}.nav-menu.active{transform:translateY(0);opacity:1;visibility:visible}.nav-item{width:100%}.nav-link{justify-content:center;padding:var(--space-md);margin:0 var(--space-sm);border-radius:var(--radius-md)}.nav-actions{display:flex;align-items:center}.nav-menu-toggle{display:block!important;background:none;border:none;color:var(--text-secondary);font-size:1.25rem;padding:var(--space-sm);border-radius:var(--radius-md);transition:all var(--transition-base);cursor:pointer}.nav-menu-toggle:hover{color:var(--text-primary);background:var(--bg-card)}.conversion-flow{padding:var(--space-lg)}.flow-header{flex-direction:column;gap:var(--space-md);text-align:center}.footer-content{grid-template-columns:1fr;text-align:center}.progress-steps{flex-direction:column;gap:var(--space-lg)}.step:after{display:none}.progress-tips{grid-template-columns:1fr}}.nav-actions{display:block}.conversion-flow{padding:var(--space-lg)}.flow-header{flex-direction:column;gap:var(--space-md);text-align:center}.footer-content{grid-template-columns:1fr;text-align:center}.url-input-container{padding:var(--space-lg)}.format-options{flex-direction:column;align-items:center}.url-info{grid-template-columns:1fr}.conversion-result{margin-top:var(--space-xl);padding:var(--space-xl);background:linear-gradient(135deg,rgba(0,212,170,.1),rgba(0,212,170,.05));border-radius:var(--radius-2xl);border:2px solid var(--success);position:relative;overflow:hidden;animation:successGlow 2s ease-in-out infinite}@keyframes successGlow{0%,to{box-shadow:0 0 20px rgba(0,212,170,.3)}50%{box-shadow:0 0 40px rgba(0,212,170,.5)}}.result-header{display:flex;align-items:center;gap:var(--space-xl);margin-bottom:var(--space-xl);text-align:center}.result-title{font-family:var(--font-display);font-size:2rem;color:var(--success);margin-bottom:var(--space-md);background:linear-gradient(135deg,var(--success) 0,var(--primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.result-description{color:var(--text-secondary);font-size:1.125rem;line-height:1.6}.file-details{margin-bottom:var(--space-xl)}.detail-card{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-lg);background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border-color);transition:all var(--transition-base)}.detail-card:hover{transform:translateY(-2px);border-color:var(--success);box-shadow:var(--shadow-md)}.detail-info{flex:1 1}.detail-name{color:var(--text-primary);font-size:1.25rem;font-weight:600;margin-bottom:var(--space-xs);word-break:break-all}.result-actions{display:flex;gap:var(--space-md);margin-bottom:var(--space-xl);justify-content:center}.download-btn-main{background:linear-gradient(135deg,var(--success) 0,var(--primary) 100%);padding:var(--space-lg) var(--space-2xl);font-size:1.125rem;position:relative;overflow:hidden}.btn-subtitle{display:block;font-size:.75rem;color:var(--text-muted);margin-top:var(--space-xs);font-family:var(--font-mono)}.result-tips{margin-bottom:var(--space-xl)}.tips-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));grid-gap:var(--space-md);gap:var(--space-md)}.tip-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center;transition:all var(--transition-base)}.tip-card:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:var(--shadow-lg)}.tip-icon-small{font-size:1.5rem;margin-bottom:var(--space-md)}.tip-content{text-align:left}.tip-content strong{color:var(--text-primary);display:block;margin-bottom:var(--space-xs);font-size:.875rem}.conversion-stats{padding:var(--space-lg);background:var(--bg-tertiary);border-radius:var(--radius-xl);border:1px solid var(--border-color)}.stats-grid-mini{display:flex;justify-content:space-around;align-items:center}.stat-number{font-family:var(--font-mono);font-size:1.5rem;font-weight:700;color:var(--text-primary)}@media (max-width:768px){.result-header{flex-direction:column;gap:var(--space-md)}.result-actions{flex-direction:column;align-items:center}.tips-grid{grid-template-columns:1fr}.stats-grid-mini{flex-direction:column;gap:var(--space-md)}}main{margin-top:80px;min-height:calc(100vh - 80px)}