*{margin:0;padding:0;box-sizing:border-box;}@keyframes fadeIn{from{opacity:0;}to{opacity:1;}}@keyframes rotate{0%,70%,100%{transform:rotate(0deg);}75%{transform:rotate(1deg);}85%{transform:rotate(-1deg);}}.back-to-top{position:fixed;right:30px;bottom:30px;width:50px;height:50px;border-radius:50%;background-color:var(--primary-color);color:var(--white);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition);box-shadow:var(--shadow);z-index:1000;}.back-to-top:hover{background-color:var(--primary-color-dark);transform:translateY(-3px);box-shadow:0 6px 16px rgba(0,0,0,0.2);}.back-to-top.visible{opacity:1;visibility:visible;}.back-to-top svg{transition:transform 0.3s ease;}.back-to-top:hover svg{transform:translateY(-2px);}:root{--primary-color:#8a2be2;--primary-color-dark:#7b1fa2;--footer-text-primary:var(--primary-color);--footer-text-secondary:rgba(255,255,255,0.8);--secondary-color:#f7b54a;--text-color:#333;--text-color-light:#666;--background-color:#f9fafc;--white:#ffffff;--section-padding:80px 0;--transition:all 0.3s ease;--border-radius:16px;--shadow:0 4px 12px rgba(0,0,0,0.08);}/* 首页A标签样式 - 去除下划线和默认样式 */a{text-decoration:none;color:inherit;}a:hover,a:focus{text-decoration:none;outline:none;}.google-icon{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;font-weight:600;font-size:4rem;display:flex;align-items:center;justify-content:center;height:100%;}.google-g{background:linear-gradient(45deg,#4285F4 0%,#4285F4 25%,#34A853 25%,#34A853 50%,#FBBC05 50%,#FBBC05 75%,#EA4335 75%,#EA4335 100%);-webkit-background-clip:text;background-clip:text;color:transparent;display:inline-block;font-size:4rem;font-weight:700;border-radius:5px;letter-spacing:-1px;padding:0 5px;}.loading-screen{position:fixed;top:0;left:0;width:100%;height:100vh;background-color:white;display:flex;justify-content:center;align-items:center;z-index:9999;transition:opacity 0.5s ease,visibility 0.5s ease;}.loading-screen.hidden{opacity:0;visibility:hidden;}.loading-spinner{width:50px;height:50px;border:3px solid #f3f3f3;border-top:3px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;}@keyframes spin{0%{transform:rotate(0deg);}100%{transform:rotate(360deg);}}.container{max-width:1200px;margin:0 auto;padding:0 20px;}.container-fluid{width:100%;padding:0 20px;}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--background-color);overflow-x:hidden;}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2;margin-bottom:20px;}h1{font-size:3rem;}h2{font-size:2.5rem;}h3{font-size:2rem;}h4{font-size:1.5rem;}h5{font-size:1.25rem;}h6{font-size:1rem;}p{margin-bottom:20px;}ul,ol{margin-bottom:20px;padding-left:20px;}img{max-width:100%;height:auto;}button{cursor:pointer;font-family:inherit;}/* 按钮样式 */.btn{display:inline-block;padding:12px 24px;font-size:14px;font-weight:600;border:none;border-radius:var(--border-radius);transition:var(--transition);cursor:pointer;text-align:center;text-decoration:none;vertical-align:middle;user-select:none;}.btn-primary{background-color:var(--primary-color);color:var(--white);}.btn-primary:hover{background-color:var(--primary-color-dark);transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.2);}.btn-secondary{background-color:var(--secondary-color);color:var(--white);}.btn-secondary:hover{background-color:#e6a53a;transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.2);}.btn-outline{background-color:transparent;border:2px solid var(--primary-color);color:var(--primary-color);}.btn-outline:hover{background-color:var(--primary-color);color:var(--white);transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.2);}.btn-sm{padding:8px 16px;font-size:12px;}.btn-lg{padding:16px 32px;font-size:16px;}/* 表单样式 */.form-group{margin-bottom:20px;}.form-label{display:block;margin-bottom:8px;font-weight:600;font-size:14px;}.form-control{width:100%;padding:12px 16px;font-size:14px;border:1px solid #e0e0e0;border-radius:var(--border-radius);background-color:var(--white);transition:var(--transition);}.form-control:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(138,43,226,0.1);}.form-check{display:flex;align-items:center;gap:10px;margin-bottom:16px;}.form-check input[type="checkbox"]{width:20px;height:20px;border:2px solid #e0e0e0;border-radius:4px;cursor:pointer;transition:var(--transition);}.form-check input[type="checkbox"]:checked{background-color:var(--primary-color);border-color:var(--primary-color);}.form-check label{cursor:pointer;font-size:14px;margin:0;}/* 卡片样式 */.card{background-color:var(--white);border-radius:var(--border-radius);box-shadow:var(--shadow);overflow:hidden;transition:var(--transition);}.card:hover{transform:translateY(-5px);box-shadow:0 8px 24px rgba(0,0,0,0.12);}.card-header{padding:20px;background-color:var(--background-color);border-bottom:1px solid #e0e0e0;}.card-body{padding:20px;}.card-footer{padding:20px;background-color:var(--background-color);border-top:1px solid #e0e0e0;}/* 导航栏样式 */.navbar{position:fixed;top:0;left:0;width:100%;background-color:var(--white);box-shadow:0 2px 10px rgba(0,0,0,0.08);z-index:999;transition:var(--transition);}.navbar-container{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;max-width:1200px;margin:0 auto;}.navbar-logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:700;color:var(--primary-color);}.navbar-logo img{height:40px;}.navbar-menu{display:flex;gap:30px;list-style:none;margin:0;padding:0;}.navbar-menu li a{color:var(--text-color);font-weight:600;transition:var(--transition);}.navbar-menu li a:hover{color:var(--primary-color);}.navbar-toggle{display:none;background:none;border:none;font-size:24px;color:var(--text-color);cursor:pointer;}.navbar-cta{display:flex;gap:15px;align-items:center;}/* 页脚样式 */.footer{background-color:var(--primary-color);color:var(--footer-text-secondary);padding:60px 0 30px;}.footer-container{max-width:1200px;margin:0 auto;padding:0 20px;}.footer-top{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:40px;margin-bottom:40px;}.footer-brand{display:flex;flex-direction:column;gap:20px;}.footer-logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:700;color:var(--white);}.footer-logo img{height:40px;}.footer-description{line-height:1.6;}.footer-social{display:flex;gap:15px;}.footer-social a{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background-color:rgba(255,255,255,0.1);color:var(--white);transition:var(--transition);}.footer-social a:hover{background-color:var(--white);color:var(--primary-color);transform:translateY(-3px);}.footer-links h4{color:var(--white);margin-bottom:20px;font-size:1.2rem;}.footer-links ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px;}.footer-links ul li a{color:var(--footer-text-secondary);transition:var(--transition);}.footer-links ul li a:hover{color:var(--white);padding-left:5px;}.footer-contact h4{color:var(--white);margin-bottom:20px;font-size:1.2rem;}.footer-contact-item{display:flex;align-items:flex-start;gap:15px;margin-bottom:15px;}.footer-contact-item i{color:var(--white);font-size:18px;margin-top:3px;}.footer-contact-item p{margin:0;line-height:1.6;}.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:30px;text-align:center;}.footer-bottom p{margin:0;}.footer-bottom-links{display:flex;justify-content:center;gap:20px;margin-top:15px;}.footer-bottom-links a{color:var(--footer-text-secondary);transition:var(--transition);}.footer-bottom-links a:hover{color:var(--white);}/* 模态框样式 */.modal{display:none;position:fixed;z-index:10000;left:0;top:0;width:100%;height:100%;background-color:rgba(0,0,0,0.5);}.modal.active{display:block;}.modal-content{position:fixed;right:0;top:0;width:100%;max-width:500px;height:100%;background-color:var(--white);box-shadow:-5px 0 25px rgba(0,0,0,0.15);overflow-y:auto;transform:translateX(100%);transition:transform 0.3s ease;border-radius:0;}.modal.active .modal-content{transform:translateX(0);}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid #e0e0e0;background-color:var(--background-color);border-radius:0;}.modal-header h3{margin:0;font-size:20px;color:var(--text-color);}.modal-close{background:none;border:none;font-size:24px;color:var(--text-color-light);cursor:pointer;padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all 0.3s ease;}.modal-close:hover{background-color:rgba(0,0,0,0.05);color:var(--text-color);}.modal-body{padding:20px;}.modal-footer{display:flex;justify-content:flex-end;gap:10px;padding:20px;border-top:1px solid #e0e0e0;background-color:var(--background-color);border-radius:0;}/* 提示弹出框样式 */.custom-alert{position:fixed;top:20px;right:20px;padding:16px 24px;border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,0.15);font-size:14px;font-weight:500;z-index:10001;animation:fadeIn 0.3s ease-out,fadeOut 0.3s ease-in 2.7s forwards;display:flex;align-items:center;gap:12px;min-width:300px;max-width:400px;}.custom-alert.success{background-color:#ffffff;color:#8a2be2;border-left:4px solid #8a2be2;box-shadow:0 4px 12px rgba(138,43,226,0.2);}.custom-alert.error{background-color:#ffffff;color:#f44336;border-left:4px solid #f44336;box-shadow:0 4px 12px rgba(244,67,54,0.2);}.custom-alert.warning{background-color:#ffffff;color:#ffc107;border-left:4px solid #ffc107;box-shadow:0 4px 12px rgba(255,193,7,0.2);}.custom-alert.info{background-color:#ffffff;color:#2196f3;border-left:4px solid #2196f3;box-shadow:0 4px 12px rgba(33,150,243,0.2);}.custom-alert i{font-size:18px;}.custom-alert .alert-content{flex:1;}.custom-alert .alert-close{background:none;border:none;color:inherit;font-size:16px;cursor:pointer;padding:0;margin-left:12px;opacity:0.7;transition:opacity 0.2s ease;}.custom-alert .alert-close:hover{opacity:1;}@keyframes fadeIn{from{opacity:0;transform:translateY(-20px);}to{opacity:1;transform:translateY(0);}}@keyframes fadeOut{from{opacity:1;transform:translateY(0);}to{opacity:0;transform:translateY(-20px);}}/* 响应式设计 */@media(max-width:1024px){h1{font-size:2.5rem;}h2{font-size:2rem;}h3{font-size:1.75rem;}}@media(max-width:768px){.navbar-menu{display:none;}.navbar-toggle{display:block;}.navbar-cta{display:none;}.footer-top{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;}h1{font-size:2rem;}h2{font-size:1.75rem;}h3{font-size:1.5rem;}}@media(max-width:480px){.container{padding:0 15px;}.footer-top{grid-template-columns:1fr;}.custom-alert{right:10px;left:10px;max-width:none;}}/* 滚动条样式 */::-webkit-scrollbar{width:8px;height:8px;}::-webkit-scrollbar-track{background-color:var(--background-color);}::-webkit-scrollbar-thumb{background-color:#c1c1c1;border-radius:4px;}::-webkit-scrollbar-thumb:hover{background-color:#a8a8a8;}/* 选择文本样式 */::selection{background-color:var(--primary-color);color:var(--white);}::-moz-selection{background-color:var(--primary-color);color:var(--white);}/* 焦点样式 */*:focus{outline:none;}/* 动画延迟 */.delay-100{animation-delay:0.1s;}.delay-200{animation-delay:0.2s;}.delay-300{animation-delay:0.3s;}.delay-400{animation-delay:0.4s;}.delay-500{animation-delay:0.5s;}/* 隐藏类 */.hidden{display:none!important;}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}/* 文本对齐 */.text-left{text-align:left;}.text-center{text-align:center;}.text-right{text-align:right;}/* 文本颜色 */.text-primary{color:var(--primary-color);}.text-secondary{color:var(--secondary-color);}.text-light{color:var(--text-color-light);}.text-white{color:var(--white);}/* 背景颜色 */.bg-primary{background-color:var(--primary-color);}.bg-secondary{background-color:var(--secondary-color);}.bg-light{background-color:var(--background-color);}.bg-white{background-color:var(--white);}/* 间距类 */.mt-10{margin-top:10px;}.mt-20{margin-top:20px;}.mt-30{margin-top:30px;}.mb-10{margin-bottom:10px;}.mb-20{margin-bottom:20px;}.mb-30{margin-bottom:30px;}.ml-10{margin-left:10px;}.mr-10{margin-right:10px;}.p-10{padding:10px;}.p-20{padding:20px;}.p-30{padding:30px;}/* 弹性布局 */.d-flex{display:flex;}.flex-column{flex-direction:column;}.justify-center{justify-content:center;}.justify-between{justify-content:space-between;}.align-center{align-items:center;}.gap-10{gap:10px;}.gap-20{gap:20px;}.gap-30{gap:30px;}/* 网格布局 */.grid{display:grid;}.grid-cols-2{grid-template-columns:repeat(2,1fr);}.grid-cols-3{grid-template-columns:repeat(3,1fr);}.grid-cols-4{grid-template-columns:repeat(4,1fr);}.gap-10{gap:10px;}.gap-20{gap:20px;}.gap-30{gap:30px;}/* 响应式网格 */@media(max-width:768px){.grid-cols-2,.grid-cols-3,.grid-cols-4{grid-template-columns:1fr;}}/* 过渡效果 */.transition{transition:var(--transition);}/* 变换效果 */.transform{transform:var(--transform);}/* 阴影效果 */.shadow{box-shadow:var(--shadow);}.shadow-lg{box-shadow:0 8px 24px rgba(0,0,0,0.15);}/* 圆角效果 */.rounded{border-radius:var(--border-radius);}.rounded-full{border-radius:50%;}.rounded-none{border-radius:0;}/* 位置 */.relative{position:relative;}.absolute{position:absolute;}.fixed{position:fixed;}.sticky{position:sticky;}/* 显示/隐藏 */.d-block{display:block;}.d-inline{display:inline;}.d-inline-block{display:inline-block;}.d-none{display:none;}/* 溢出 */.overflow-hidden{overflow:hidden;}.overflow-auto{overflow:auto;}.overflow-scroll{overflow:scroll;}/* 文本截断 */.text-truncate{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}/* 字体粗细 */.font-light{font-weight:300;}.font-normal{font-weight:400;}.font-medium{font-weight:500;}.font-semibold{font-weight:600;}.font-bold{font-weight:700;}/* 字体大小 */.text-xs{font-size:0.75rem;}.text-sm{font-size:0.875rem;}.text-base{font-size:1rem;}.text-lg{font-size:1.125rem;}.text-xl{font-size:1.25rem;}.text-2xl{font-size:1.5rem;}.text-3xl{font-size:1.875rem;}.text-4xl{font-size:2.25rem;}