/* 全局样式 */
 :root {
     --primary-color: #2563eb;
     --secondary-color: #3b82f6;
     --text-color: #1f2937;
     --light-text: #6b7280;
     --background: #ffffff;
     --section-bg: #f3f4f6;
     --transition: all 0.3s ease;
 }

 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 html {
     scroll-behavior: smooth;
 }

 body {
     font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
     line-height: 1.6;
     color: var(--text-color);
 }

 .container {
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 20px;
 }

 /* 导航栏样式 */
 .navbar {
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     background: rgba(255, 255, 255, 0.95);
     backdrop-filter: blur(10px);
     z-index: 1000;
     box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
 }

 .nav-content {
     display: flex;
     justify-content: space-between;
     align-items: center;
     height: 70px;
     padding: 0 30px;
 }

 .logo a {
     font-size: 24px;
     font-weight: bold;
     color: var(--primary-color);
     text-decoration: none;
 }

 .nav-links {
     display: flex;
     list-style: none;
     gap: 30px;
 }

 .nav-links a {
     text-decoration: none;
     color: var(--text-color);
     font-weight: 500;
     font-size: 25px;
     transition: var(--transition);
 }

 .nav-links a:hover {
     color: var(--primary-color);
 }

 .menu-btn {
     display: none;
     cursor: pointer;
 }

 .login-btn {
     display: flex;
     align-items: center;
 }

 .login-btn a {
     display: flex;
     align-items: center;
     justify-content: center;
     width: 40px;
     height: 40px;
     background: var(--primary-color);
     color: white;
     border-radius: 50%;
     text-decoration: none;
     transition: var(--transition);
     box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
 }

 .login-btn a:hover {
     background: var(--secondary-color);
     transform: translateY(-2px);
     box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
 }

 .login-btn i {
     font-size: 16px;
 }

 /* 移动端导航样式 */
 @media (max-width: 768px) {
     .menu-btn {
         display: block;
         font-size: 24px;
     }

     .login-btn {
         display: flex;
         margin-right: 15px;
     }

     .login-btn a {
         width: 35px;
         height: 35px;
     }

     .login-btn i {
         font-size: 14px;
     }

     .nav-links {
         position: absolute;
         top: 70px;
         left: 0;
         width: 100%;
         background: #fff;
         flex-direction: column;
         gap: 0;
         height: 0;
         overflow: hidden;
         transition: height 0.3s ease;
     }

     .nav-links.active {
         height: 200px;
         box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
     }

     .nav-links li {
         width: 100%;
     }

     .nav-links a {
         display: block;
         padding: 15px 30px;
         text-align: center;
         border-bottom: 1px solid #eee;
     }

     .nav-links li:last-child a {
         border-bottom: none;
     }
 }

 /* 移除冲突的响应式样式 */
 @media (max-width: 768px) {
     .nav-links {
         display: flex;
         flex-direction: column;
     }
 }

 /* 英雄区域样式 */
 .hero {
     height: 100vh;
     display: flex;
     align-items: center;
     justify-content: center;
     text-align: center;
     padding: 0 20px;
     background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
 }

 .hero-content {
     max-width: 800px;
 }

 .hero h1 {
     font-size: 3.5rem;
     margin-bottom: 20px;
     opacity: 0;
     transform: translateY(20px);
     animation: fadeInUp 0.8s forwards;
 }

 .hero p {
     font-size: 1.5rem;
     color: var(--light-text);
     margin-bottom: 30px;
     opacity: 0;
     transform: translateY(20px);
     animation: fadeInUp 0.8s 0.2s forwards;
 }

 .highlight {
     color: var(--primary-color);
 }

 /* 按钮样式 */
 .btn {
     display: inline-block;
     padding: 12px 30px;
     border-radius: 25px;
     text-decoration: none;
     font-weight: 500;
     transition: var(--transition);
     margin: 10px;
 }

 .btn.primary {
     background: var(--primary-color);
     color: white;
 }

 .btn.secondary {
     background: transparent;
     border: 2px solid var(--primary-color);
     color: var(--primary-color);
 }

 .btn:hover {
     transform: translateY(-2px);
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
 }

 /* 滚动指示器 */
 .scroll-indicator {
     position: absolute;
     bottom: 30px;
     left: 50%;
     transform: translateX(-50%);
 }

 .mouse {
     width: 30px;
     height: 50px;
     border: 2px solid var(--text-color);
     border-radius: 15px;
     position: relative;
 }

 .mouse::before {
     content: '';
     position: absolute;
     width: 4px;
     height: 8px;
     background: var(--text-color);
     left: 50%;
     transform: translateX(-50%);
     top: 8px;
     border-radius: 2px;
     animation: scroll 2s infinite;
 }

 /* 关于部分样式 */
 .about {
     padding: 100px 0;
     background: var(--section-bg);
 }

 .section-title {
     text-align: center;
     font-size: 2.5rem;
     margin-bottom: 50px;
 }

 .about-content {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 50px;
     align-items: center;
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 20px;
 }

 .about-text p {
     margin-bottom: 20px;
     color: var(--light-text);
     line-height: 1.8;
 }

 .about-stats {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 20px;
     margin-top: 30px;
 }

 .stat-item {
     text-align: center;
     padding: 20px;
     background: white;
     border-radius: 10px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
     transition: var(--transition);
 }

 .stat-item:hover {
     transform: translateY(-5px);
 }

 .stat-item .number {
     font-size: 2rem;
     font-weight: bold;
     color: var(--primary-color);
     display: block;
 }

 /* 技能部分样式 */
 .skills {
     padding: 100px 0;
 }

 .skills-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
     gap: 30px;
 }

 .skill-card {
     padding: 30px;
     background: white;
     border-radius: 15px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
     transition: var(--transition);
 }

 .skill-card:hover {
     transform: translateY(-5px);
 }

 .skill-card i {
     font-size: 2.5rem;
     color: var(--primary-color);
     margin-bottom: 20px;
 }

 .skill-bar {
     height: 6px;
     background: #e5e7eb;
     border-radius: 3px;
     margin-top: 15px;
     overflow: hidden;
 }

 .skill-progress {
     height: 100%;
     background: var(--primary-color);
     width: 0;
     transition: width 1.5s ease-in-out;
 }

 .skill-progress.animate {
     width: var(--progress);
 }

 /* 项目部分样式 */
 .projects {
     padding: 100px 0;
     background: var(--section-bg);
 }

 .project-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
     gap: 30px;
 }

 .project-card {
     background: white;
     border-radius: 15px;
     overflow: hidden;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
     transition: var(--transition);
 }

 .project-card:hover {
     transform: translateY(-5px);
 }

 .project-info {
     padding: 20px;
 }

 .project-info h3 {
     margin-bottom: 10px;
     color: var(--text-color);
 }

 .project-info p {
     color: var(--light-text);
     margin-bottom: 15px;
 }

 .project-tags {
     display: flex;
     flex-wrap: wrap;
     gap: 8px;
     margin-bottom: 15px;
 }

 .tag {
     padding: 4px 12px;
     background-color: var(--section-bg);
     color: var(--primary-color);
     border-radius: 15px;
     font-size: 0.85rem;
     font-weight: 500;
 }

 .project-image {
     position: relative;
     overflow: hidden;
 }

 .project-image img {
     width: 100%;
     height: 220px;
     object-fit: cover;
     transition: transform 0.3s ease;
 }

 .project-card:hover .project-image img {
     transform: scale(1.05);
 }

 /* 联系部分样式 */
 .contact {
     padding: 100px 0;
     background: var(--background);
 }

 .contact-content {
     display: grid;
     grid-template-columns: 1fr 2fr;
     gap: 50px;
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 20px;
 }

 .contact-form {
     background: white;
     padding: 30px;
     border-radius: 15px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
     display: grid;
     gap: 20px;
 }

 .form-group {
     display: grid;
     gap: 10px;
 }

 .form-group label {
     font-weight: 500;
     color: var(--text-color);
 }

 .form-group input,
 .form-group textarea {
     width: 100%;
     padding: 12px 15px;
     border: 1px solid #e5e7eb;
     border-radius: 8px;
     font-size: 1rem;
     transition: all 0.3s ease;
 }

 .form-group input:focus,
 .form-group textarea:focus {
     outline: none;
     border-color: var(--primary-color);
     box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
 }

 .form-group textarea {
     height: 150px;
     resize: none;
 }

 .contact-info {
     background: white;
     padding: 30px;
     border-radius: 15px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
     display: flex;
     flex-direction: column;
     gap: 20px;
 }

 .info-item {
     display: flex;
     align-items: center;
     gap: 15px;
     padding: 10px 0;
 }

 .info-item i {
     font-size: 1.5rem;
     color: var(--primary-color);
     width: 40px;
     height: 40px;
     display: flex;
     align-items: center;
     justify-content: center;
     background: rgba(37, 99, 235, 0.1);
     border-radius: 50%;
 }

 .info-item .info-text {
     flex: 1;
 }

 .info-item .info-text h4 {
     font-weight: 600;
     margin-bottom: 5px;
     color: var(--text-color);
 }

 .info-item .info-text p {
     color: var(--light-text);
 }

 /* 页脚样式 */
 .footer {
     background: var(--section-bg);
     padding: 40px 0;
     text-align: center;
 }

 .social-links {
     margin-bottom: 20px;
 }

 .social-links a {
     font-size: 20px;
     margin: 0 10px;
     color: var(--text-color);
     transition: var(--transition);
 }

 .social-links a:hover {
     color: var(--primary-color);
 }

 .friend-links {
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 10px;
     margin-bottom: 20px;
     font-size: 16px;
 }

 .friend-title {
     font-weight: bold;
     color: var(--primary-color);
     margin-right: 8px;
     letter-spacing: 1px;
 }

 .friend-links a {
     color: var(--light-text);
     text-decoration: none;
     padding: 2px 10px;
     border-radius: 5px;
     transition: background 0.2s, color 0.2s;
 }

 .friend-links a:hover {
     background: var(--primary-color);
     color: #fff;
 }

 /* 动画 */
 @keyframes fadeInUp {
     to {
         opacity: 1;
         transform: translateY(0);
     }
 }

 @keyframes scroll {
     0% {
         transform: translate(-50%, 0);
         opacity: 1;
     }

     100% {
         transform: translate(-50%, 15px);
         opacity: 0;
     }
 }

 /* 响应式设计 */
 @media (max-width: 768px) {
     .about-content {
         grid-template-columns: 1fr;
         gap: 30px;
         padding: 0 20px;
     }

     .about-stats {
         grid-template-columns: repeat(2, 1fr);
         margin-top: 20px;
     }

     .contact-content {
         grid-template-columns: 1fr;
         gap: 30px;
         padding: 0 20px;
     }

     .contact-info,
     .contact-form {
         padding: 20px;
     }

     .info-item {
         padding: 8px 0;
     }
 }

 @media (max-width: 480px) {
     .about-stats {
         grid-template-columns: 1fr;
     }

     .stat-item {
         padding: 15px;
     }

     .section-title {
         font-size: 2rem;
         margin-bottom: 30px;
     }
 }

 /* 返回顶部按钮样式 */
 #back-to-top {
     position: fixed;
     bottom: 30px;
     right: 30px;
     width: 40px;
     height: 40px;
     background-color: var(--primary-color);
     color: white;
     border-radius: 50%;
     text-align: center;
     line-height: 40px;
     cursor: pointer;
     display: none;
     z-index: 999;
     transition: var(--transition);
     box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
 }

 #back-to-top:hover {
     background-color: var(--secondary-color);
     transform: translateY(-3px);
 }

 #back-to-top i {
     font-size: 20px;
 }

 /* 模态框样式 */
 .modal {
     display: none;
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     background-color: rgba(0, 0, 0, 0.5);
     z-index: 9999;
     opacity: 0;
     visibility: hidden;
     pointer-events: none;
     transition: opacity 0.3s ease, visibility 0.3s ease;
 }

 .modal.show {
     display: flex !important;
     justify-content: center;
     align-items: center;
     opacity: 1;
     visibility: visible;
     pointer-events: auto;
 }

 .modal-content {
     background-color: white;
     padding: 30px;
     border-radius: 15px;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
     width: 90%;
     max-width: 400px;
     transform: translateY(-20px);
     transition: transform 0.3s ease;
     text-align: center;
     position: relative;
 }

 .modal.show .modal-content {
     transform: translateY(0);
 }

 .modal-header {
     display: flex;
     justify-content: space-between;
     align-items: center;
     margin-bottom: 20px;
 }

 .close-btn {
     font-size: 24px;
     color: var(--light-text);
     cursor: pointer;
     transition: color 0.3s ease;
     line-height: 1;
     padding: 5px;
 }

 .close-btn:hover {
     color: var(--primary-color);
 }

 .modal-content h3 {
     margin: 0;
     color: var(--primary-color);
     font-size: 1.5rem;
 }

 .modal-content p {
     margin: 0 0 20px 0;
     color: var(--light-text);
 }

 .modal .input-group {
     margin-top: 20px;
 }

 .modal input {
     width: 100%;
     padding: 12px;
     border: 2px solid #e5e7eb;
     border-radius: 8px;
     margin-bottom: 15px;
     font-size: 1rem;
     transition: border-color 0.3s ease;
 }

 .modal input:focus {
     outline: none;
     border-color: var(--primary-color);
     box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
 }

 .modal .button-group {
     display: flex;
     gap: 10px;
     justify-content: center;
 }

 .modal .btn {
     min-width: 100px;
     margin: 0;
 }

 /* 动画效果 */
 @keyframes fadeIn {
     from {
         opacity: 0;
         transform: translateY(-20px);
     }

     to {
         opacity: 1;
         transform: translateY(0);
     }
 }