:root{--color-primary: #18A058;--color-primary-hover: #148C4A;--color-secondary: #2080F0;--color-text: #1F2329;--color-text-secondary: #4E5969;--color-text-tertiary: #86909C;--color-bg: #FFFFFF;--color-bg-secondary: #F7F8FA;--color-bg-tertiary: #F0F1F3;--color-border: #E5E6EB;--color-border-light: #F0F1F3;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .07);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--transition-fast: .15s ease;--transition-normal: .2s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;font-size:14px;line-height:1.6;color:var(--color-text);background:var(--color-bg-secondary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-hover)}button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit}input,textarea,select{font-family:inherit;font-size:inherit}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.header-inner{display:flex;align-items:center;justify-content:space-between}.site-header{background:var(--color-bg);border-bottom:1px solid var(--color-border);padding:1rem 0;position:sticky;top:0;z-index:100}.logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--color-text);font-weight:600;font-size:1.25rem}.logo-icon{font-size:1.5rem}.main-nav{display:flex;gap:1.5rem;align-items:center}.main-nav a{color:var(--color-text-secondary);text-decoration:none;font-size:.95rem;transition:color .2s}.main-nav a:hover,.main-nav a.active{color:var(--color-primary)}.nav-dropdown{position:relative}.nav-dropdown-btn{color:var(--color-text-secondary);font-size:.95rem;padding:0;transition:color .2s}.nav-dropdown-btn:hover{color:var(--color-primary)}.nav-dropdown-menu{display:none;position:absolute;top:100%;right:0;margin-top:.5rem;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);padding:.5rem 0;min-width:160px;z-index:200}.nav-dropdown-menu a{display:block;padding:.5rem 1rem;font-size:.9rem}.nav-dropdown-menu a:hover{background:var(--color-bg-secondary)}.nav-dropdown:hover .nav-dropdown-menu{display:block}.site-main{min-height:calc(100vh - 200px);padding:2rem 0}.site-footer{background:var(--color-bg-secondary);border-top:1px solid var(--color-border);padding:2rem 0;text-align:center;color:var(--color-text-secondary);font-size:.9rem}.site-footer a{color:var(--color-primary);text-decoration:none}.site-footer a:hover{text-decoration:underline}.hero{background:linear-gradient(135deg,var(--color-primary) 0%,#148C4A 100%);color:#fff;padding:4rem 0 3rem;text-align:center}.hero h1{font-size:2.5rem;font-weight:700;margin-bottom:.5rem}.hero .subtitle{font-size:1.1rem;opacity:.9;margin-bottom:2rem}.search-box{max-width:500px;margin:0 auto;position:relative}.search-box input{width:100%;padding:1rem 3rem 1rem 1.5rem;border:none;border-radius:var(--radius-lg);font-size:1rem;box-shadow:var(--shadow-lg)}.search-box input:focus{outline:2px solid var(--color-secondary)}.search-icon{position:absolute;right:1rem;top:50%;transform:translateY(-50%);font-size:1.2rem}.categories,.hot-tools,.category-tools{padding:3rem 0}.categories h2,.hot-tools h2,.category-tools h2{font-size:1.5rem;font-weight:600;margin-bottom:1.5rem;color:var(--color-text)}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1rem}.category-card{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.5rem;text-align:center;transition:all var(--transition-normal);text-decoration:none;color:var(--color-text)}.category-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.category-icon{font-size:2rem;display:block;margin-bottom:.5rem}.category-card h3{font-size:1rem;font-weight:600;margin-bottom:.25rem}.category-card p{font-size:.85rem;color:var(--color-text-secondary)}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.tool-card{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.25rem;transition:all var(--transition-normal);text-decoration:none;color:var(--color-text)}.tool-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.tool-card h4{font-size:1rem;font-weight:600;margin-bottom:.5rem}.tool-card p{font-size:.9rem;color:var(--color-text-secondary);margin-bottom:.75rem}.tool-tag{display:inline-block;padding:.2rem .6rem;background:var(--color-bg-tertiary);border-radius:var(--radius-sm);font-size:.8rem;color:var(--color-text-secondary)}.cta-section{margin-top:3rem;padding:2rem;background:linear-gradient(135deg,var(--color-primary) 0%,#148C4A 100%);border-radius:var(--radius-lg);text-align:center;color:#fff}.cta-section p{font-size:1.1rem;margin-bottom:1rem}.cta-button{display:inline-block;padding:.75rem 2rem;background:#fff;color:var(--color-primary);border-radius:var(--radius-md);font-weight:600;text-decoration:none;transition:all var(--transition-normal)}.cta-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.tool-page{padding:2rem 0}.tool-header{margin-bottom:2rem}.tool-header h1{font-size:1.75rem;font-weight:600;margin-bottom:.5rem;color:var(--color-text)}.tool-header p{font-size:1rem;color:var(--color-text-secondary)}.tool-guide{margin-top:2rem}.tool-guide h2{font-size:1.25rem;font-weight:600;margin-bottom:1rem;color:var(--color-text)}.tool-guide-content{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.5rem}.tool-guide-content h2{font-size:1.1rem;margin-top:1.5rem;margin-bottom:.75rem}.tool-guide-content h2:first-child{margin-top:0}.tool-guide-content p{color:var(--color-text-secondary);margin-bottom:.75rem;line-height:1.8}.tool-guide-content ol,.tool-guide-content ul{padding-left:1.5rem;margin-bottom:.75rem}.tool-guide-content li{color:var(--color-text-secondary);margin-bottom:.25rem}.tool-faq{margin-top:1.5rem}.tool-faq h2{font-size:1.25rem;font-weight:600;margin-bottom:1rem;color:var(--color-text)}.faq-item{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:1.25rem;margin-bottom:.75rem}.faq-item h3{font-size:1rem;font-weight:600;margin-bottom:.5rem;color:var(--color-text)}.faq-item p{color:var(--color-text-secondary);line-height:1.7}.related-tools{margin-top:2rem}.related-tools h2{font-size:1.25rem;font-weight:600;margin-bottom:1rem}.breadcrumb{margin-bottom:1.5rem;font-size:.9rem;color:var(--color-text-tertiary)}.breadcrumb a{color:var(--color-text-secondary)}.breadcrumb a:hover{color:var(--color-primary)}.breadcrumb span{margin:0 .5rem}.not-found{text-align:center;padding:6rem 0}.not-found h1{font-size:4rem;color:var(--color-text-tertiary);margin-bottom:1rem}.not-found p{font-size:1.1rem;color:var(--color-text-secondary);margin-bottom:2rem}@media(max-width:768px){.container{padding:0 1rem}.hero{padding:2rem 1rem}.hero h1{font-size:1.5rem}.category-grid{grid-template-columns:repeat(2,1fr);gap:1rem}.tool-grid{grid-template-columns:1fr}.actions{flex-wrap:wrap}.btn-primary,.btn-secondary{flex:1;min-width:120px}.brand-bar-text{font-size:.8rem}.float-contact-panel{right:1rem;left:1rem;width:auto}}@media(max-width:480px){.category-grid{grid-template-columns:1fr}.hero h1{font-size:1.25rem}.tool-header h1{font-size:1.5rem}.brand-bar-inner{flex-wrap:wrap;gap:.25rem}.brand-bar-text{flex-basis:100%;text-align:center;font-size:.75rem}}.brand-bar{background:linear-gradient(90deg,var(--color-primary) 0%,#148C4A 100%);color:#fff;padding:.5rem 0;font-size:.85rem;position:relative;z-index:101}.brand-bar-inner{display:flex;align-items:center;justify-content:center;gap:1rem}.brand-bar-text{opacity:.95}.brand-bar-link{color:#fff;font-weight:600;text-decoration:underline;white-space:nowrap;transition:opacity var(--transition-fast)}.brand-bar-link:hover{opacity:.8}.brand-bar-close{color:#ffffffb3;font-size:1.2rem;line-height:1;padding:0 .25rem;transition:color var(--transition-fast)}.brand-bar-close:hover{color:#fff}.float-contact{position:fixed;bottom:2rem;right:2rem;z-index:200}.float-contact-toggle{width:52px;height:52px;border-radius:50%;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #18a05859;transition:all var(--transition-normal);position:relative;z-index:2}.float-contact-toggle:hover{transform:scale(1.08);box-shadow:0 6px 16px #18a05873}.float-contact-toggle.active{background:var(--color-text-secondary)}.float-contact-icon{font-size:1.5rem;line-height:1}.float-contact-panel{position:absolute;bottom:64px;right:0;width:280px;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:1.25rem;opacity:0;visibility:hidden;transform:translateY(10px) scale(.95);transition:all var(--transition-normal)}.float-contact-panel.show{opacity:1;visibility:visible;transform:translateY(0) scale(1)}.float-contact-header{font-size:1rem;font-weight:600;color:var(--color-text);margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid var(--color-border)}.float-contact-item{margin-bottom:.75rem;font-size:.85rem;line-height:1.5}.float-contact-label{display:block;color:var(--color-text-secondary);font-size:.8rem;margin-bottom:.15rem}.float-contact-item a{color:var(--color-primary);font-weight:500}.float-contact-cta{display:block;text-align:center;margin-top:1rem;padding:.6rem 1rem;background:var(--color-primary);color:#fff!important;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;transition:all var(--transition-normal)}.float-contact-cta:hover{background:var(--color-primary-hover);transform:translateY(-1px)}