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(prefers-color-scheme:dark){:root{--color-bg:#1f2121;--color-surface:#262828;--color-text:#f5f5f5;--color-text-secondary:#a7a9a9b3;--color-primary:#32b8c6;--color-primary-hover:#2da6b2;--color-border:#777c7c4d;--color-card-border:#777c7c33}}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-bg);color:var(--color-text);line-height:1.6}.container{max-width:1200px;margin:0 auto;padding:20px}.header{text-align:center;margin-bottom:32px;padding:32px 0}.header h1{margin-bottom:12px;font-size:2.5rem;font-weight:600}.subtitle{color:var(--color-text-secondary);font-size:1.1rem}.toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px;display:flex}.toolbar-spacer{margin-left:auto}.btn{border-radius:var(--radius-base);cursor:pointer;border:none;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:500;text-decoration:none;transition:all 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var(--color-card-border);border-radius:var(--radius-lg);text-align:center;min-height:120px;color:var(--color-text-secondary);justify-content:center;align-items:center;margin:32px 0;padding:20px;font-size:14px;display:flex}.premium-banner{background:linear-gradient(135deg,var(--color-primary),#29a3b0);color:#fff;border-radius:var(--radius-lg);text-align:center;margin:32px 0;padding:24px}.premium-banner h3{margin-bottom:12px;font-size:1.5rem}.premium-banner p{opacity:.95;margin-bottom:16px}.btn-premium{color:var(--color-primary);background:#fff;padding:12px 32px;font-weight:600}.btn-premium:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0003}.content-section{background:var(--color-surface);border:1px solid var(--color-card-border);border-radius:var(--radius-lg);margin:32px 0;padding:32px}.content-section h2{margin-bottom:16px;font-size:1.8rem}.content-section h3{margin:24px 0 12px;font-size:1.3rem}.content-section 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0}.nav-container{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;max-width:1200px;margin:0 auto;padding:0 20px;display:flex}.nav-brand{color:var(--color-text);align-items:center;gap:8px;font-size:1.25rem;font-weight:600;text-decoration:none;display:flex}.nav-links{gap:8px;display:flex}.nav-link{border-radius:var(--radius-base);color:var(--color-text-secondary);padding:8px 16px;font-size:14px;font-weight:500;text-decoration:none;transition:all .2s}.nav-link:hover{background:var(--color-secondary);color:var(--color-text)}.nav-link.active{background:var(--color-primary);color:#fff}.option-label{color:var(--color-text);font-size:14px;font-weight:500}.option-select{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);padding:6px 12px;font-size:14px}.option-checkbox{cursor:pointer;color:var(--color-text);align-items:center;gap:8px;font-size:14px;display:flex}.option-checkbox input[type=checkbox]{cursor:pointer}.example-box{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-base);margin:20px 0;padding:20px}.example-box h4{margin:16px 0 8px;font-size:1rem}.example-box pre{background:var(--color-surface);border-radius:var(--radius-sm);margin:8px 0;padding:12px;font-size:13px;overflow-x:auto}@media (max-width:768px){.nav-container{flex-direction:column;align-items:flex-start}.nav-links{width:100%}.nav-link{text-align:center;flex:1}.converter-options{flex-direction:column;align-items:flex-start}}.homepage-header{text-align:center;padding:64px 0 48px}.homepage-title{background:linear-gradient(135deg,var(--color-primary),#29a3b0);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:16px;font-size:3.5rem;font-weight:700}.homepage-subtitle{color:var(--color-text-secondary);max-width:700px;margin:0 auto;font-size:1.2rem;line-height:1.6}.tools-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;margin:48px 0;display:grid}.tool-card{background:var(--color-surface);border:1px solid var(--color-card-border);border-radius:var(--radius-lg);color:var(--color-text);transition:all .3s var(--ease-standard);padding:32px;text-decoration:none;position:relative;overflow:hidden}.tool-card:hover{box-shadow:var(--shadow-lg);border-color:var(--color-primary);transform:translateY(-4px)}.tool-card-icon{margin-bottom:16px;font-size:3rem}.tool-card-title{margin-bottom:12px;font-size:1.5rem;font-weight:600}.tool-card-description{color:var(--color-text-secondary);margin-bottom:16px;line-height:1.6}.tool-card-tags{flex-wrap:wrap;gap:8px;margin-bottom:16px;display:flex}.tool-tag{background:var(--color-secondary);color:var(--color-text);border-radius:var(--radius-full);padding:4px 12px;font-size:12px;font-weight:500}.tool-card-arrow{color:var(--color-primary);opacity:0;transition:all .3s var(--ease-standard);font-size:1.5rem;position:absolute;bottom:24px;right:24px;transform:translate(-10px)}.tool-card:hover .tool-card-arrow{opacity:1;transform:translate(0)}.mobile-menu-btn{color:var(--color-text);cursor:pointer;background:0 0;border:none;padding:8px;font-size:1.5rem;display:none}@media (max-width:768px){.homepage-title{font-size:2.5rem}.homepage-subtitle{font-size:1rem}.tools-grid{grid-template-columns:1fr}.mobile-menu-btn{display:block}.nav-links{background:var(--color-surface);border-top:1px solid var(--color-border);flex-direction:column;gap:8px;padding:16px;display:none;position:absolute;top:100%;left:0;right:0}.nav-links.open{display:flex}.nav-link{text-align:center;width:100%}}.mode-switcher{background:var(--color-bg);border-radius:var(--radius-base);border:1px solid var(--color-border);gap:8px;padding:4px;display:flex}.mode-btn{border-radius:var(--radius-sm);cursor:pointer;color:var(--color-text-secondary);background:0 0;border:none;padding:8px 20px;font-size:14px;font-weight:500;transition:all .2s}.mode-btn:hover{background:var(--color-surface);color:var(--color-text)}.mode-btn.active{background:var(--color-primary);color:#fff}.converter-options{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-base);flex-wrap:wrap;align-items:center;gap:24px;margin-bottom:20px;padding:16px;display:flex}.option-group{align-items:center;gap:8px;display:flex}.file-upload-btn{background:var(--color-secondary);border:1px solid var(--color-border);border-radius:var(--radius-base);cursor:pointer;color:var(--color-text);padding:8px 16px;font-size:14px;font-weight:500;transition:all .2s}.file-upload-btn:hover{background:var(--color-secondary-hover)}.footer{background:var(--color-surface);border-top:1px solid var(--color-border);text-align:center;color:var(--color-text-secondary);margin-top:64px;padding:32px 0;font-size:14px}.footer .container{max-width:1200px;margin:0 auto;padding:0 20px}.footer p{margin-bottom:8px}.footer-link{color:var(--color-primary);text-decoration:none;transition:color .2s}.footer-link:hover{color:var(--color-primary-hover);text-decoration:underline}.footer-small{opacity:.8;margin-top:8px;font-size:12px}.contact-methods{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;margin:32px 0;display:grid}.contact-card{background:var(--color-surface);border:1px solid var(--color-card-border);border-radius:var(--radius-lg);transition:all .3s var(--ease-standard);padding:24px}.contact-card:hover{box-shadow:var(--shadow-md);border-color:var(--color-primary);transform:translateY(-2px)}.contact-card h3{color:var(--color-text);margin-bottom:12px;font-size:1.25rem}.contact-card p{color:var(--color-text-secondary);margin-bottom:8px}.contact-detail{margin:16px 0!important}.contact-detail a{color:var(--color-primary);word-break:break-all;font-size:1.1rem;font-weight:600;text-decoration:none}.contact-detail a:hover{text-decoration:underline}.contact-note{opacity:.8;font-size:.875rem;font-style:italic;margin-top:12px!important}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}