* {
   margin: 0;
   padding: 0;
   box-sizing: border-box;
   font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
 }

 body {
   background: linear-gradient(135deg, #0f0c29, #1a1a40, #0d0d26);
   color: #e0e0ff;
   min-height: 100vh;
   overflow-x: hidden;
   position: relative;
 }

 body::before {
   content: "";
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   background: radial-gradient(circle at 15% 25%,
       rgba(67, 97, 238, 0.15) 0%,
       transparent 40%),
     radial-gradient(circle at 85% 75%,
       rgba(101, 198, 172, 0.15) 0%,
       transparent 40%);
   z-index: -1;
 }

 .container {
   max-width: 1200px;
   margin: 0 auto;
   padding: 2rem;
 }

 header {
   text-align: center;
   padding: 3rem 0;
   margin-bottom: 2rem;
   position: relative;
 }

 .logo {
   font-size: 3.2rem;
   font-weight: 800;
   background: linear-gradient(90deg, #00dbde, #fc00ff, #00dbde);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   margin-bottom: 0.8rem;
   letter-spacing: 2px;
   text-shadow: 0 0 15px rgba(92, 70, 156, 0.5);
   animation: glow 3s infinite alternate;
 }

 .error-code {
   font-size: 10rem;
   font-weight: 800;
   background: linear-gradient(90deg, #ff416c, #ff4b2b, #ff416c);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   margin-bottom: 0.8rem;
   letter-spacing: 2px;
   text-shadow: 0 0 15px rgba(255, 75, 43, 0.5);
   animation: glow 3s infinite alternate;
   position: relative;
 }

 .error-text {
   font-size: 2.5rem;
   font-weight: 600;
   color: #ffffff;
   margin-bottom: 1.5rem;
   position: relative;
 }

 .error-text::after {
   content: "";
   position: absolute;
   bottom: -10px;
   left: 50%;
   transform: translateX(-50%);
   width: 80px;
   height: 4px;
   background: linear-gradient(90deg, #ff416c, #ff4b2b);
   border-radius: 2px;
 }

 .subtitle {
   font-size: 1.4rem;
   color: #a0a0ff;
   max-width: 700px;
   margin: 0 auto;
   line-height: 1.6;
   font-weight: 300;
 }

 .breadcrumb {
   background: rgba(16, 18, 27, 0.4);
   padding: 0.8rem 1.5rem;
   border-radius: 30px;
   margin: 1.5rem auto;
   display: inline-block;
   font-size: 0.9rem;
   backdrop-filter: blur(5px);
   border: 1px solid rgba(92, 70, 156, 0.2);
 }

 .breadcrumb a {
   color: #a0a0ff;
   text-decoration: none;
   transition: color 0.3s;
   cursor: default;
 }

 .breadcrumb a:hover {
   color: #8e54e9;
 }

 .breadcrumb span {
   margin: 0 8px;
   color: #5c469c;
 }

 .cards-container {
   display: flex;
   flex-wrap: wrap;
   justify-content: center;
   gap: 2.5rem;
   margin: 2rem 0;
 }

 .card {
   background: rgba(16, 18, 27, 0.6);
   border: 1px solid rgba(92, 70, 156, 0.4);
   border-radius: 20px;
   width: 350px;
   padding: 2.5rem;
   text-align: center;
   transition: all 0.4s ease;
   backdrop-filter: blur(12px);
   box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
   position: relative;
   overflow: hidden;
   z-index: 1;
 }

 .card::before {
   content: "";
   position: absolute;
   top: -2px;
   left: -2px;
   right: -2px;
   bottom: -2px;
   background: linear-gradient(45deg, #ff00cc, #333399, #00dbde, #fc00ff);
   z-index: -2;
   border-radius: 22px;
   opacity: 0.7;
 }

 .card::after {
   content: "";
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
   background: linear-gradient(135deg,
       rgba(16, 18, 27, 0.8),
       rgba(16, 18, 27, 0.9));
   z-index: -1;
   border-radius: 20px;
 }

 .card:hover {
   transform: translateY(-10px) scale(1.02);
   box-shadow: 0 20px 40px rgba(92, 70, 156, 0.7);
 }

 .card-icon {
   font-size: 3.8rem;
   margin-bottom: 1.8rem;
   background: linear-gradient(135deg, #00dbde, #fc00ff);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
 }

 .card-title {
   font-size: 1.6rem;
   margin-bottom: 1.5rem;
   color: #ffffff;
   font-weight: 600;
   letter-spacing: 0.5px;
 }

 .card-content {
   margin-bottom: 2rem;
   line-height: 1.7;
   color: #c0c0ff;
   font-size: 1.1rem;
 }

 .qr-container {
   display: flex;
   justify-content: center;
   margin: 1.8rem 0;
 }

 .qr-image {
   width: 200px;
   height: 200px;
   border-radius: 12px;
   display: flex;
   align-items: center;
   justify-content: center;
   overflow: hidden;
   position: relative;
   box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
   background: #fff;
   padding: 10px;
 }

 .qr-image img {
   width: 100%;
   height: 100%;
   object-fit: cover;
   border-radius: 8px;
 }

 .qr-image::before {
   content: "";
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
   background: linear-gradient(45deg,
       transparent 0%,
       rgba(255, 255, 255, 0.1) 50%,
       transparent 100%);
   z-index: 1;
   pointer-events: none;
 }

 .qr-image::after {
   content: "";
   position: absolute;
   width: 40px;
   height: 40px;
   border: 4px solid rgba(255, 255, 255, 0.8);
   border-radius: 8px;
   z-index: 2;
 }

 .qr-text {
   margin-top: 1rem;
   font-size: 1rem;
   color: #a0a0ff;
   font-weight: 300;
 }

 .btn {
   display: inline-block;
   background: linear-gradient(90deg, #4776e6, #8e54e9);
   color: white;
   padding: 14px 36px;
   border-radius: 50px;
   text-decoration: none;
   font-weight: 600;
   letter-spacing: 0.8px;
   transition: all 0.3s ease;
   border: none;
   cursor: pointer;
   box-shadow: 0 7px 20px rgba(142, 84, 233, 0.5);
   margin: 15px 0;
   font-size: 1.1rem;
   position: relative;
   overflow: hidden;
 }

 .btn::before {
   content: "";
   position: absolute;
   top: 0;
   left: -100%;
   width: 100%;
   height: 100%;
   background: linear-gradient(90deg,
       transparent,
       rgba(255, 255, 255, 0.3),
       transparent);
   transition: 0.5s;
 }

 .btn:hover {
   transform: translateY(-5px) scale(1.05);
   box-shadow: 0 10px 25px rgba(142, 84, 233, 0.8);
 }

 .btn:hover::before {
   left: 100%;
 }

 .btn i {
   margin-right: 10px;
 }

 .doc-section,
 .link-category {
   margin: 4rem auto;
   max-width: 850px;
 }

 .doc-section {
   background: rgba(16, 18, 27, 0.6);
   border-radius: 20px;
   padding: 3rem;
   text-align: center;
   backdrop-filter: blur(12px);
   border: 1px solid rgba(92, 70, 156, 0.4);
   box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
   position: relative;
   overflow: hidden;
 }

 .doc-section::before {
   content: "";
   position: absolute;
   top: -2px;
   left: -2px;
   right: -2px;
   bottom: -2px;
   background: linear-gradient(45deg, #00dbde, #fc00ff, #00dbde);
   z-index: -1;
   border-radius: 22px;
   opacity: 0.4;
 }

 .doc-title {
   font-size: 2rem;
   margin-bottom: 1.8rem;
   color: #ffffff;
   background: linear-gradient(90deg, #00dbde, #fc00ff);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
 }

 .doc-description {
   text-align: center;
   margin-bottom: 2.5rem;
   line-height: 1.8;
   color: #c0c0ff;
   font-size: 1.15rem;
   max-width: 700px;
   margin-left: auto;
   margin-right: auto;
 }

 .doc-link {
   color: #8e54e9;
   text-decoration: none;
   border-bottom: 1px dashed #8e54e9;
   transition: all 0.2s ease;
   font-weight: 500;
 }

 .doc-link:hover {
   color: #00dbde;
   border-bottom: 1px solid #00dbde;
 }

 .link-category {
   background: rgba(25, 28, 40, 0.7);
   border-radius: 15px;
   padding: 1.8rem;
   border: 1px solid rgba(92, 70, 156, 0.3);
   position: relative;
   overflow: hidden;
 }

 .link-category::before {
   content: "";
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
   background: linear-gradient(135deg,
       rgba(71, 118, 230, 0.1),
       rgba(142, 84, 233, 0.1));
   z-index: -1;
   border-radius: 15px;
 }

 .link-category:hover {
   box-shadow: 0 2px 8px rgba(92, 70, 156, 0.7);
 }

 .category-title {
   font-size: 1.4rem;
   color: #8e54e9;
   margin-bottom: 1.2rem;
   padding-bottom: 0.8rem;
   border-bottom: 1px solid rgba(92, 70, 156, 0.4);
   display: flex;
   align-items: center;
 }

 .category-title i {
   margin-right: 10px;
   font-size: 1.3rem;
 }

 .link-list {
   list-style: none;
   padding: 0;
 }

 .link-item {
   margin-bottom: 0.8rem;
   position: relative;
   padding-left: 1.5rem;
 }

 .link-item::before {
   content: "•";
   position: absolute;
   top: 0.4rem;
   left: 0;
   color: #00dbde;
   font-size: 1.2rem;
 }

 .link-item a {
   color: #c0c0ff;
   text-decoration: none;
   font-size: 1.1rem;
   transition: all 0.3s ease;
   display: block;
   padding: 0.5rem 0;
   position: relative;
 }

 .link-item a:hover {
   color: #8e54e9;
   transform: translateX(5px);
 }

 .link-item a::after {
   content: "";
   position: absolute;
   bottom: 0;
   left: 0;
   width: 0;
   height: 1px;
   background: linear-gradient(90deg, #8e54e9, #00dbde);
   transition: width 0.3s ease;
 }

 .link-item a:hover::after {
   width: 100%;
 }

 .link-hint {
   font-size: 0.85rem;
   color: #6666aa;
   margin-top: 1.5rem;
   text-align: center;
   font-style: italic;
 }

 footer {
   text-align: center;
   padding: 3rem 0 2rem;
   margin-top: 3rem;
   color: #8888cc;
   font-size: 1rem;
   border-top: 1px solid rgba(92, 70, 156, 0.3);
 }

 .footer-links {
   display: flex;
   justify-content: center;
   flex-flow: column;
   gap: 0.6rem;
   margin-top: 1.5rem;
   margin-bottom: 1.5rem;
   font-size: 0.9rem;
   color: #a0a0ff;
 }

 .footer-links a {
   color: #a0a0ff;
   text-decoration: none;
   transition: color 0.3s;
 }

 .footer-links a:hover {
   color: #8e54e9;
 }

 .tech-grid {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   pointer-events: none;
   z-index: -1;
   opacity: 0.1;
 }

 .grid-line {
   position: absolute;
   background: rgba(255, 255, 255, 0.15);
 }

 .grid-horizontal {
   width: 100%;
   height: 1px;
   top: 0;
   left: 0;
 }

 .grid-vertical {
   height: 100%;
   width: 1px;
   top: 0;
   left: 0;
 }

 .particles {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   pointer-events: none;
   z-index: -1;
 }

 .particle {
   position: absolute;
   border-radius: 50%;
   background: rgba(92, 70, 156, 0.4);
   animation: float 15s infinite linear;
 }

 /* Google Analytics 状态指示器 */
 .ga-indicator {
   position: fixed;
   bottom: 20px;
   right: 20px;
   background: rgba(16, 18, 27, 0.8);
   border: 1px solid rgba(92, 70, 156, 0.4);
   border-radius: 50px;
   padding: 10px 20px;
   font-size: 0.85rem;
   color: #a0a0ff;
   backdrop-filter: blur(5px);
   display: flex;
   align-items: center;
   gap: 10px;
   z-index: 1000;
   box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
 }

 .ga-indicator::before {
   content: "";
   width: 12px;
   height: 12px;
   border-radius: 50%;
   background: #0f9d58;
   display: inline-block;
   animation: pulse 1.5s infinite;
 }

 /* 404 动画效果 */
 @keyframes float404 {
   0% {
     transform: translateY(0) rotate(0deg);
     opacity: 1;
   }

   25% {
     transform: translateY(-20px) rotate(5deg);
   }

   50% {
     transform: translateY(0) rotate(0deg);
   }

   75% {
     transform: translateY(-20px) rotate(-5deg);
   }

   100% {
     transform: translateY(0) rotate(0deg);
   }
 }

 .error-animation {
   animation: float404 6s infinite ease-in-out;
 }

 @keyframes glow {
   0% {
     text-shadow: 0 0 10px rgba(92, 70, 156, 0.5);
   }

   100% {
     text-shadow: 0 0 20px rgba(92, 70, 156, 0.8),
       0 0 30px rgba(67, 97, 238, 0.6);
   }
 }

 @keyframes float {
   0% {
     transform: translateY(0) translateX(0) rotate(0deg);
     opacity: 0;
   }

   10% {
     opacity: 1;
   }

   90% {
     opacity: 1;
   }

   100% {
     transform: translateY(-100vh) translateX(100px) rotate(360deg);
     opacity: 0;
   }
 }

 @keyframes pulse {
   0% {
     box-shadow: 0 0 0 0 rgba(15, 157, 88, 0.7);
   }

   70% {
     box-shadow: 0 0 0 8px rgba(15, 157, 88, 0);
   }

   100% {
     box-shadow: 0 0 0 0 rgba(15, 157, 88, 0);
   }
 }

 @media (max-width: 768px) {
   .cards-container {
     flex-direction: column;
     align-items: center;
   }

   .card {
     width: 100%;
     max-width: 400px;
   }

   .logo {
     font-size: 2.5rem;
   }

   .error-code {
     font-size: 6rem;
   }

   .error-text {
     font-size: 1.8rem;
   }

   .subtitle {
     font-size: 1.2rem;
   }

   .ga-indicator {
     bottom: 10px;
     right: 10px;
     font-size: 0.75rem;
   }

   .sitemap-links {
     grid-template-columns: 1fr;
   }
 }

 .hex-grid {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   z-index: -1;
   opacity: 0.03;
   overflow: hidden;
 }

 .hex {
   position: absolute;
   width: 100px;
   height: 57.74px;
   background: rgba(255, 255, 255, 0.1);
   clip-path: polygon(50% 0%,
       100% 25%,
       100% 75%,
       50% 100%,
       0% 75%,
       0% 25%);
   animation: rotate 60s infinite linear;
 }

 @keyframes rotate {
   0% {
     transform: rotate(0deg);
   }

   100% {
     transform: rotate(360deg);
   }
 }

 .broken-robot {
   font-size: 5rem;
   margin-bottom: 1.5rem;
   animation: broken-robot 4s infinite ease-in-out;
 }

 @keyframes broken-robot {

   0%,
   100% {
     transform: translateY(0) rotate(0deg);
   }

   25% {
     transform: translateY(-20px) rotate(10deg);
   }

   50% {
     transform: translateY(0) rotate(0deg);
   }

   75% {
     transform: translateY(-20px) rotate(-10deg);
   }
 }