:root{--primary-color: #0071e3;--secondary-color: #34c759;--danger-color: #ff3b30;--background-color: #fbfbfd;--card-background: #ffffff;--text-color: #1d1d1f;--border-radius: 12px;--nav-height: 64px;--nav-height-mobile: 64px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1)}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,SF Pro Icons,Helvetica Neue,Helvetica,Arial,sans-serif;margin:0;padding:0;background:var(--background-color);color:var(--text-color);line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100vh;display:flex;flex-direction:column}.top-nav{position:fixed;top:0;left:0;right:0;height:var(--nav-height);background:#fffc;backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.1);z-index:1000}.nav-content{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}.logo{font-size:24px;font-weight:600;color:var(--text-color);text-decoration:none;transition:opacity .2s ease}.logo:hover{opacity:.8}.nav-links{display:flex;gap:24px;align-items:center}.nav-btn{background:none;border:none;padding:8px 16px;border-radius:980px;cursor:pointer;font-size:14px;font-weight:500;color:var(--text-color);letter-spacing:-.01em;transition:all .2s ease;text-decoration:none;white-space:nowrap}.nav-btn:hover{background:#0000000d;transform:translateY(-1px)}.nav-btn.active{background:var(--primary-color);color:#fff}.nav-dropdown{position:relative;display:inline-block}.nav-dropdown-btn{background:none;border:none;padding:8px 16px;border-radius:980px;cursor:pointer;font-size:14px;font-weight:500;color:var(--text-color);letter-spacing:-.01em;transition:all .2s ease;display:flex;align-items:center;gap:8px}.nav-dropdown-btn:hover{background:#0000000d;transform:translateY(-1px)}.nav-dropdown-content{display:none;position:absolute;right:0;top:100%;background:var(--card-background);min-width:240px;border-radius:var(--border-radius);box-shadow:0 4px 12px #0000001a;padding:8px;opacity:0;transform:translateY(10px);transition:all .2s ease;z-index:1000}.nav-dropdown:hover .nav-dropdown-content{display:block;opacity:1;transform:translateY(0)}.dropdown-section{padding:8px 0;border-bottom:1px solid rgba(0,0,0,.06)}.dropdown-section:last-child{border-bottom:none}.dropdown-header{display:block;padding:8px 16px;font-size:12px;font-weight:600;text-transform:uppercase;color:#86868b;letter-spacing:.05em}.container{max-width:1200px;margin:calc(var(--nav-height) + 20px) auto 40px;padding:0 24px;flex:1}.home-hero{text-align:center;padding:60px 0}.home-hero h1{font-size:48px;font-weight:600;letter-spacing:-.015em;margin:0 0 16px;background:linear-gradient(135deg,var(--primary-color),#5856d6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:21px;color:#86868b;margin-bottom:48px;display:flex;align-items:center;justify-content:center;gap:12px}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding:32px 0;max-width:1200px;margin:0 auto}.tool-card{background:var(--card-background);border-radius:var(--border-radius);padding:40px 32px;text-align:center;text-decoration:none;color:var(--text-color);transition:all .3s ease;box-shadow:var(--shadow-sm);border:1px solid rgba(0,0,0,.1);display:flex;flex-direction:column;gap:16px;position:relative;overflow:hidden}.tool-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-color),#5856d6);opacity:0;transition:opacity .3s ease}.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.tool-card:hover:before{opacity:1}.tool-icon{font-size:56px;margin-bottom:16px;transition:transform .3s ease}.tool-card:hover .tool-icon{transform:scale(1.1)}.tool-card h3{font-size:24px;font-weight:600;margin:0}.tool-card p{font-size:16px;color:#86868b;margin:0;flex-grow:1;line-height:1.5}.converter-app{background:var(--card-background);border-radius:var(--border-radius);padding:32px;box-shadow:var(--shadow-md);margin-bottom:40px;position:relative;border:1px solid rgba(0,0,0,.1)}.converter-app h1{font-size:32px;font-weight:600;margin:0 0 8px;text-align:center;background:linear-gradient(135deg,var(--primary-color),#5856d6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.format-selector{display:flex;gap:16px;margin-bottom:24px;background:var(--background-color);padding:24px;border-radius:var(--border-radius);align-items:center}.format-selector label{font-size:14px;font-weight:500;color:var(--text-color);min-width:80px}select{padding:12px 32px 12px 12px;border:1px solid rgba(0,0,0,.1);border-radius:var(--border-radius);background:#fff;font-size:14px;color:var(--text-color);-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg width='12' height='8' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M10 2L6 6 2 2' stroke='%23666' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;min-width:160px;transition:all .2s ease}select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0071e31a}.drop-zone{border:2px dashed rgba(0,113,227,.3);border-radius:var(--border-radius);padding:40px;text-align:center;cursor:pointer;transition:all .2s ease;background:var(--background-color);margin-bottom:24px}.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary-color);background:#0071e30d}.drop-zone-content{display:flex;flex-direction:column;align-items:center;gap:12px}.drop-zone-content svg{color:var(--primary-color);width:48px;height:48px;transition:transform .3s ease}.drop-zone:hover .drop-zone-content svg{transform:translateY(-4px)}.drop-zone-content p{margin:0;font-size:17px;color:var(--text-color);font-weight:500}.supported-formats{font-size:12px;color:#86868b;background:#0000000d;padding:4px 12px;border-radius:100px}.preview-section{margin:24px 0}.preview-container{background:var(--background-color);border-radius:var(--border-radius);padding:24px;min-height:200px;display:flex;flex-direction:column;align-items:center;gap:16px;border:1px solid rgba(0,0,0,.1)}.preview-container img,.preview-container audio{max-width:100%;max-height:400px;object-fit:contain;border-radius:var(--border-radius);box-shadow:var(--shadow-sm)}.preview-placeholder{color:#86868b;font-size:17px;display:flex;align-items:center;gap:8px}.preview-placeholder:before{content:"👆";font-size:24px}.image-info,.audio-info{margin-top:12px;font-size:14px;color:#86868b;text-align:center;background:#0000000d;padding:8px 16px;border-radius:100px;display:inline-block}.file-list{width:100%;max-height:200px;overflow-y:auto;margin-top:16px;background:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow-sm);border:1px solid rgba(0,0,0,.1)}.file-item{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid rgba(0,0,0,.05);font-size:14px}.file-item:last-child{border-bottom:none}.file-name{font-weight:500;color:var(--text-color)}.file-size{color:#86868b;background:#0000000d;padding:4px 8px;border-radius:6px;font-size:12px}button{background:var(--primary-color);color:#fff;border:none;padding:12px 24px;border-radius:980px;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s ease;display:flex;align-items:center;justify-content:center;gap:8px;box-shadow:0 2px 4px #0071e333}button:hover:not(:disabled){background:#0077ed;transform:translateY(-1px);box-shadow:0 4px 8px #0071e34d}button:disabled{background:#d2d2d7;cursor:not-allowed;transform:none;box-shadow:none}button svg{width:16px;height:16px}.footer{background:var(--card-background);border-top:1px solid rgba(0,0,0,.1);padding:40px 0;margin-top:auto}.footer-content{max-width:1200px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px}.footer-section h4{font-size:14px;font-weight:600;margin:0 0 16px;color:var(--text-color)}.footer-links{list-style:none;padding:0;margin:0}.footer-links li{margin-bottom:8px}.footer-links a{color:#86868b;text-decoration:none;font-size:13px;transition:all .2s ease;display:inline-block}.footer-links a:hover{color:var(--primary-color);transform:translate(4px)}.footer-bottom{text-align:center;padding-top:24px;margin-top:24px;border-top:1px solid rgba(0,0,0,.1);color:#86868b;font-size:12px}.ssl-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 8px;background:#34c7591a;border-radius:6px;color:#34c759;font-size:12px;font-weight:500;transition:all .2s ease}.ssl-badge:hover{background:#34c75933;transform:translateY(-1px)}.ssl-badge svg{width:14px;height:14px}.converter-app .ssl-badge{display:flex;justify-content:center;margin:0 auto 24px}.stats-section{text-align:center;padding:40px;background:var(--card-background);border-radius:var(--border-radius);margin-top:40px;border:1px solid rgba(0,0,0,.1);box-shadow:var(--shadow-sm)}.stats{display:flex;justify-content:center;gap:40px;margin-top:20px}.stat-item{display:flex;flex-direction:column;align-items:center;gap:12px;padding:24px;background:var(--background-color);border-radius:var(--border-radius);min-width:200px;transition:all .2s ease}.stat-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.stat-value{font-size:48px;font-weight:700;background:linear-gradient(135deg,var(--primary-color),#5856d6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}.stat-label{font-size:14px;color:#86868b;text-transform:uppercase;letter-spacing:.05em;font-weight:500}.legal-content{max-width:800px;margin:0 auto;padding:40px;background:var(--card-background);border-radius:var(--border-radius);box-shadow:var(--shadow-md);border:1px solid rgba(0,0,0,.1)}.legal-content h1{font-size:32px;font-weight:600;margin:0 0 24px;background:linear-gradient(135deg,var(--primary-color),#5856d6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.legal-content h2{font-size:24px;font-weight:600;margin:32px 0 16px;color:var(--text-color)}.legal-content p{margin:16px 0;color:#424245;line-height:1.6}.legal-content ul{margin:16px 0;padding-left:24px}.legal-content li{margin:8px 0;color:#424245;line-height:1.6}.legal-content strong{color:var(--text-color);font-weight:600}.about-section{margin:40px 0;padding:32px;background:var(--background-color);border-radius:var(--border-radius);border:1px solid rgba(0,0,0,.1)}.about-section:first-child{margin-top:0}.about-section:last-child{margin-bottom:0}@media (max-width: 1200px){.tools-grid{grid-template-columns:repeat(2,1fr);padding:24px 0;gap:24px}}@media (max-width: 768px){:root{--nav-height: var(--nav-height-mobile)}.nav-content{flex-direction:row;justify-content:space-between;align-items:center;padding:0 16px;height:var(--nav-height-mobile)}.logo{font-size:20px}.nav-links{position:fixed;top:var(--nav-height-mobile);left:0;right:0;background:var(--card-background);padding:8px 16px;border-bottom:1px solid rgba(0,0,0,.1);display:flex;gap:8px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;-ms-overflow-style:none;white-space:nowrap}.nav-links::-webkit-scrollbar{display:none}.nav-btn{padding:6px 12px;font-size:13px;white-space:nowrap}.nav-dropdown{position:static}.nav-dropdown.open .nav-dropdown-content{display:block;opacity:1;transform:translateY(0);pointer-events:auto}.nav-dropdown-content{position:fixed;top:calc(var(--nav-height-mobile) + 44px);left:16px;right:16px;max-height:calc(100vh - var(--nav-height-mobile) - 100px);overflow-y:auto;background:var(--card-background);border-radius:var(--border-radius);box-shadow:0 4px 20px #00000026;padding:12px;z-index:1001;pointer-events:none;display:block;opacity:0;transform:translateY(-10px);transition:all .2s ease}.dropdown-section{padding:8px 0}.dropdown-header{padding:8px 12px;font-size:11px}.nav-dropdown-content .nav-btn{width:100%;text-align:left;padding:10px 12px;border-radius:8px}.container{margin-top:calc(var(--nav-height-mobile) + 44px);padding:0 16px}.home-hero h1{font-size:32px}.hero-subtitle{font-size:18px;flex-direction:column}.tools-grid{grid-template-columns:1fr;padding:16px 0;gap:20px}.tool-card{padding:32px 24px}.converter-app{padding:24px 16px}.converter-app h1{font-size:28px}.format-selector{flex-direction:column;padding:16px}.format-selector label{min-width:auto}select{width:100%}.drop-zone{padding:24px 16px}.preview-container{padding:16px}.footer-content{grid-template-columns:1fr;gap:32px}.legal-content,.about-section{padding:24px 16px}.stat-item{min-width:auto;width:100%}}.nav-dropdown-backdrop{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:#0000004d;z-index:1000;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .2s ease}.nav-dropdown.open .nav-dropdown-backdrop{display:block;opacity:1}