:root {
      --bg-body: linear-gradient(to bottom, #ffffff 0%, #f5f5f7 50%, #e8e8ed 100%);
      --text-primary: #1d1d1f;
      --text-secondary: #6e6e73;
      --accent-blue: #0061ff;
      --accent-purple: #60efff;
      --accent-green: #30d158;
      --card-bg: #ffffff;
      --card-shadow: rgba(0, 0, 0, 0.08);
      --nav-bg: rgba(255, 255, 255, 0.72);
      --ease-apple: cubic-bezier(0.28, 0.11, 0.32, 1);
  }

  * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      -webkit-font-smoothing: antialiased;
  }

  .section {
      padding: 100px 20px 120px;
      position: relative;
  }



  .container {
      max-width: 1200px;
      margin: 0 auto;
      position: relative;
  }

  .section-header {
      text-align: center;
      margin-bottom: 120px;
      opacity: 0;
      transform: translateY(40px);
      animation: fadeInUp 1s ease forwards;
      position: relative;
      z-index: 10;
  }

  .section-title {
      font-size: 56px;
      font-weight: 300;
      color: #1a1a1a;
      margin-bottom: 24px;
      letter-spacing: -2px;
      line-height: 1.2;
  }

  .section-desc {
      font-size: 20px;
      color: #666;
      font-weight: 300;
      letter-spacing: 0.5px;
  }

  .features-flow {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
  }

  .feature-block {
      position: relative;
      margin-bottom: 60px;
      opacity: 0;
      transform: translateY(60px);
      animation: flowIn 0.8s ease forwards;
  }

  .feature-block:nth-child(1) {
      animation-delay: 0.1s;
  }

  .feature-block:nth-child(2) {
      animation-delay: 0.2s;
  }

  .feature-block:nth-child(3) {
      animation-delay: 0.3s;
  }

  .feature-block:nth-child(4) {
      animation-delay: 0.4s;
  }

  .feature-block:nth-child(5) {
      animation-delay: 0.5s;
  }

  .feature-block:nth-child(6) {
      animation-delay: 0.6s;
  }

  .feature-block:nth-child(7) {
      animation-delay: 0.7s;
  }

  .feature-block:nth-child(8) {
      animation-delay: 0.8s;
  }

  .feature-block::before {
      content: '';
      position: absolute;
      left: 50%;
      top: -30px;
      transform: translateX(-50%);
      width: 12px;
      height: 12px;
      background: linear-gradient(135deg, #0061ff, #60efff);
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
      z-index: 5;
      transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover::before {
      transform: translateX(-50%) scale(1.5);
      box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.2), 0 0 20px rgba(99, 102, 241, 0.3);
  }

  .feature-main {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(20px);
      border-radius: 28px;
      padding: 48px 56px;
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.9);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.04);
      transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
  }

  .feature-main::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(168, 85, 247, 0.03) 100%);
      opacity: 0;
      transition: opacity 0.6s ease;
  }

  .feature-block:hover .feature-main::before {
      opacity: 1;
  }

  .feature-block:hover .feature-main {
      transform: translateY(-8px) scale(1.01);
      box-shadow: 0 40px 100px rgba(0, 0, 0, 0.1);
      border-color: rgba(99, 102, 241, 0.3);
  }

  .feature-header {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-bottom: 28px;
      position: relative;
  }

  .feature-number {
      font-size: 72px;
      font-weight: 200;
      background: linear-gradient(135deg, #0061ff, #60efff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1;
      opacity: 0.15;
      min-width: 80px;
      transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover .feature-number {
      opacity: 0.25;
      transform: scale(1.1);
  }

  .feature-title-group {
      flex: 1;
  }

  .feature-title {
      font-size: 32px;
      font-weight: 500;
      color: #1a1a1a;
      margin-bottom: 8px;
      letter-spacing: -0.5px;
      transition: color 0.4s ease;
  }

  .feature-block:hover .feature-title {
      color: #0061ff;
  }

  .feature-subtitle {
      font-size: 16px;
      color: #666;
      font-weight: 300;
      line-height: 1.6;
  }

  .feature-highlight-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin: 32px 0;
      padding: 28px;
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.02) 0%, rgba(168, 85, 247, 0.02) 100%);
      border-radius: 16px;
      border: 1px solid rgba(99, 102, 241, 0.08);
      transition: all 0.4s ease;
  }

  .feature-block:hover .feature-highlight-list {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(168, 85, 247, 0.05) 100%);
      border-color: rgba(99, 102, 241, 0.15);
  }

  .highlight-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      transition: all 0.3s ease;
  }

  .highlight-item::before {
      content: '◆';
      color: #0061ff;
      font-size: 10px;
      margin-top: 6px;
      transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover .highlight-item::before {
      transform: scale(1.4) rotate(45deg);
      color: #60efff;
  }

  .highlight-item span {
      font-size: 14px;
      color: #555;
      line-height: 1.6;
  }

  /* 折叠内容区域 - 关键优化 */
  .feature-details {
      margin-top: 40px;
      max-height: 0;
      opacity: 0;
      overflow: hidden;
      transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .feature-block:hover .feature-details {
      max-height: 2000px;
      opacity: 1;
  }

  .detail-card {
      background: white;
      border-radius: 16px;
      padding: 0;
      margin-bottom: 0;
      border: 1px solid rgba(0, 0, 0, 0.04);
      position: relative;
      overflow: hidden;
      transform: translateY(-20px);
      opacity: 0;
      transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover .detail-card {
      padding: 32px;
      margin-bottom: 20px;
      transform: translateY(0);
      opacity: 1;
  }

  .detail-card:nth-child(1) {
      transition-delay: 0.1s;
  }

  .detail-card:nth-child(2) {
      transition-delay: 0.15s;
  }

  .detail-card:nth-child(3) {
      transition-delay: 0.2s;
  }

  .detail-card:nth-child(4) {
      transition-delay: 0.25s;
  }

  .detail-card:nth-child(5) {
      transition-delay: 0.3s;
  }

  .detail-card:nth-child(6) {
      transition-delay: 0.35s;
  }

  .detail-card::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      width: 4px;
      height: 0;
      background: linear-gradient(180deg, #0061ff, #60efff);
      transition: height 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) 0.2s;
  }

  .feature-block:hover .detail-card::before {
      height: 100%;
  }

  .detail-card:hover {
      transform: translateX(8px);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
      background: linear-gradient(135deg, #ffffff 0%, #fafbff 100%);
  }

  .detail-card:last-child {
      margin-bottom: 0;
  }

  .detail-card h4 {
      font-size: 18px;
      font-weight: 500;
      color: #1a1a1a;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      opacity: 0;
      transform: translateX(-10px);
      transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover .detail-card h4 {
      opacity: 1;
      transform: translateX(0);
  }

  .detail-card:nth-child(1) h4 {
      transition-delay: 0.2s;
  }

  .detail-card:nth-child(2) h4 {
      transition-delay: 0.25s;
  }

  .detail-card:nth-child(3) h4 {
      transition-delay: 0.3s;
  }

  .detail-card:nth-child(4) h4 {
      transition-delay: 0.35s;
  }

  .detail-card:nth-child(5) h4 {
      transition-delay: 0.4s;
  }

  .detail-card:nth-child(6) h4 {
      transition-delay: 0.45s;
  }

  .detail-card h4::before {
      content: '';
      width: 6px;
      height: 6px;
      background: linear-gradient(135deg, #0061ff, #60efff);
      border-radius: 50%;
      transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .detail-card:hover h4::before {
      transform: scale(1.6);
  }

  .detail-card p {
      font-size: 15px;
      color: #555;
      line-height: 1.8;
      opacity: 0;
      transform: translateY(10px);
      transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  }

  .feature-block:hover .detail-card p {
      opacity: 1;
      transform: translateY(0);
  }

  .detail-card:nth-child(1) p {
      transition-delay: 0.3s;
  }

  .detail-card:nth-child(2) p {
      transition-delay: 0.35s;
  }

  .detail-card:nth-child(3) p {
      transition-delay: 0.4s;
  }

  .detail-card:nth-child(4) p {
      transition-delay: 0.45s;
  }

  .detail-card:nth-child(5) p {
      transition-delay: 0.5s;
  }

  .detail-card:nth-child(6) p {
      transition-delay: 0.55s;
  }

  .divider {
      height: 80px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .divider::before {
      content: '';
      width: 1px;
      height: 100%;
      background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.15) 50%, transparent 100%);
  }

  .divider-dot {
      position: absolute;
      width: 8px;
      height: 8px;
      background: linear-gradient(135deg, #0061ff, #60efff);
      border-radius: 50%;
      opacity: 0.3;
      animation: pulse 2s ease-in-out infinite;
  }

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

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

  @keyframes pulse {

      0%,
      100% {
          transform: scale(1);
          opacity: 0.3;
      }

      50% {
          transform: scale(1.3);
          opacity: 0.6;
      }
  }

  /* 滚动条样式 */
  ::-webkit-scrollbar {
      width: 8px;
  }

  ::-webkit-scrollbar-track {
      background: transparent;
  }

  ::-webkit-scrollbar-thumb {
      background: linear-gradient(180deg, #0061ff, #60efff);
      border-radius: 4px;
  }

  ::-webkit-scrollbar-thumb:hover {
      background: linear-gradient(180deg, #5558e3, #9333ea);
  }

  /* 悬浮提示 */
  .hover-hint {
      position: absolute;
      bottom: 20px;
      right: 32px;
      font-size: 12px;
      color: #999;
      opacity: 1;
      transition: opacity 0.3s ease;
      pointer-events: none;
  }

  .feature-block:hover .hover-hint {
      opacity: 0;
  }

  /* 响应式设计 */
  @media (max-width: 768px) {
      .section {
          padding: 60px 16px 80px;
      }

      .section-title {
          font-size: 36px;
      }

      .section-desc {
          font-size: 16px;
      }

      .feature-main {
          padding: 32px 24px;
      }

      .feature-header {
          flex-direction: column;
          align-items: flex-start;
          gap: 12px;
      }

      .feature-number {
          font-size: 48px;
          min-width: auto;
      }

      .feature-title {
          font-size: 24px;
      }

      .feature-subtitle {
          font-size: 14px;
      }

      .feature-highlight-list {
          grid-template-columns: 1fr;
          padding: 20px;
          gap: 12px;
      }

      .feature-block:hover .detail-card {
          padding: 24px;
      }

      .detail-card h4 {
          font-size: 16px;
      }

      .detail-card p {
          font-size: 14px;
      }

      .hover-hint {
          display: none;
      }
  }

  /* 平滑滚动 */
  html {
      scroll-behavior: smooth;
  }

  /* 性能优化 */
  .feature-block {
      will-change: transform;
  }

  .detail-card {
      will-change: transform, opacity;
  }

  .phone {
      display: flex;
      align-items: center;
      border: 1px solid #e0e0e0;
      border-radius: 20px;
      padding: 5px 12px;
  }

  .phone-icon {
      height: 14px;
      margin-right: 5px;
  }

  .phone-number {
      font-size: 13px;
      color: #333;
  }

  body {
      font-family: "SF Pro Display", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
      background: var(--bg-body);
      color: var(--text-primary);
      overflow-x: hidden;
      line-height: 1.6;
  }

  /* ---------------- 导航栏 ---------------- */
  nav {
      position: fixed;
      top: 0;
      width: 100%;
      height: 44px;
      background: var(--nav-bg);
      backdrop-filter: saturate(180%) blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      transition: transform 0.4s var(--ease-apple), box-shadow 0.4s;
  }

  nav.scrolled {
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  }

  .nav-content {
      max-width: 1024px;
      margin: 0 auto;
      height: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 22px;
  }

  .logo {
      font-size: 21px;
      font-weight: 600;
      color: #1d1d1f;
      text-decoration: none;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
  }

  .nav-links {
      display: flex;
      gap: 36px;
      list-style: none;
  }

  .nav-links a {
      text-decoration: none;
      color: #1d1d1f;
      font-size: 12px;
      opacity: 0.8;
      transition: opacity 0.3s var(--ease-apple);
      font-weight: 400;
  }

  .nav-links a:hover {
      opacity: 1;
  }

  /* ---------------- Hero 区域 ---------------- */
  .hero {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      position: relative;
      overflow: hidden;
      padding: 100px 20px 80px;
  }

  .hero-background {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      z-index: 0;
      overflow: hidden;
  }

  .gradient-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.3;
      animation: float 20s ease-in-out infinite;
  }

  .orb-1 {
      width: 500px;
      height: 500px;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      top: 10%;
      left: 10%;
      animation-delay: 0s;
  }

  .orb-2 {
      width: 400px;
      height: 400px;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      bottom: 20%;
      right: 15%;
      animation-delay: 7s;
  }

  .orb-3 {
      width: 350px;
      height: 350px;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      top: 40%;
      right: 25%;
      animation-delay: 14s;
  }

  @keyframes float {

      0%,
      100% {
          transform: translate(0, 0) scale(1);
      }

      33% {
          transform: translate(50px, -50px) scale(1.1);
      }

      66% {
          transform: translate(-30px, 30px) scale(0.9);
      }
  }

  .hero-content {
      position: relative;
      z-index: 10;
      max-width: 980px;
  }

  .hero h1 {
      font-size: clamp(48px, 8vw, 96px);
      font-weight: 700;
      letter-spacing: -0.015em;
      line-height: 1.05;
      margin-bottom: 24px;
      color: #1d1d1f;
      opacity: 0;
      transform: translateY(40px);
      animation: fadeUp 1.2s var(--ease-apple) forwards 0.3s;
  }

  .hero .subtitle {
      font-size: clamp(21px, 3vw, 28px);
      font-weight: 400;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      opacity: 0;
      transform: translateY(40px);
      animation: fadeUp 1.2s var(--ease-apple) forwards 0.5s;
  }

  .hero-cta {
      opacity: 0;
      animation: fadeUp 1.2s var(--ease-apple) forwards 0.7s;
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
  }

  .btn-primary {
      background: var(--accent-blue);
      color: #fff;
      padding: 12px 24px;
      border-radius: 980px;
      font-size: 17px;
      font-weight: 400;
      text-decoration: none;
      transition: all 0.3s var(--ease-apple);
      display: inline-block;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0, 113, 227, 0.2);
  }

  .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(0, 113, 227, 0.3);
  }

  .btn-secondary {
      background: transparent;
      color: var(--accent-blue);
      padding: 12px 24px;
      border-radius: 980px;
      font-size: 17px;
      font-weight: 400;
      text-decoration: none;
      transition: all 0.3s var(--ease-apple);
      display: inline-block;
      border: 1px solid var(--accent-blue);
  }

  .btn-secondary:hover {
      background: rgba(0, 113, 227, 0.08);
  }

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

  /* ---------------- 价值主张 ---------------- */
  .value-section {
      padding: 100px 20px;
      background: linear-gradient(to bottom, #f5f5f7, #ffffff);
  }

  .value-grid {
      max-width: 1024px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 40px;
  }

  .value-item {
      text-align: center;
      padding: 40px 20px;
      background: var(--card-bg);
      border-radius: 18px;
      box-shadow: 0 4px 20px var(--card-shadow);
      transition: transform 0.4s var(--ease-apple), box-shadow 0.4s;
  }

  .value-item:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  }

  .value-icon {
      font-size: 56px;
      margin-bottom: 20px;
      display: inline-block;
      animation: bounce 2s ease-in-out infinite;
  }

  .value-item:nth-child(1) .value-icon {
      animation-delay: 0s;
  }

  .value-item:nth-child(2) .value-icon {
      animation-delay: 0.3s;
  }

  .value-item:nth-child(3) .value-icon {
      animation-delay: 0.6s;
  }

  @keyframes bounce {

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

      50% {
          transform: translateY(-10px);
      }
  }

  .value-item h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
      color: #1d1d1f;
  }

  .value-item p {
      font-size: 17px;
      color: var(--text-secondary);
      line-height: 1.5;
  }

  /* ---------------- 通用布局 ---------------- */
  .section {
      padding: 120px 20px;
      position: relative;
  }

  .container {
      max-width: 1024px;
      margin: 0 auto;
  }

  .section-header {
      text-align: center;
      margin-bottom: 80px;
  }

  .section-title {
      font-size: clamp(40px, 6vw, 64px);
      font-weight: 700;
      letter-spacing: -0.015em;
      margin-bottom: 16px;
      color: #1d1d1f;
      line-height: 1.1;
  }

  .section-desc {
      font-size: clamp(19px, 2.5vw, 24px);
      color: var(--text-secondary);
      max-width: 720px;
      margin: 0 auto;
      font-weight: 400;
  }

  /* ---------------- 功能卡片网格 ---------------- */
  .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
      margin-top: 60px;
  }

  .feature-card {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 48px 36px;
      position: relative;
      overflow: hidden;
      cursor: pointer;
      transition: all 0.5s var(--ease-apple);
      box-shadow: 0 4px 20px var(--card-shadow);
      border: 1px solid rgba(0, 0, 0, 0.04);
  }

  .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      transform: scaleX(0);
      transition: transform 0.5s var(--ease-apple);
      transform-origin: left;
  }

  .feature-card:hover::before {
      transform: scaleX(1);
  }

  .feature-card:hover {
      transform: translateY(-12px) scale(1.02);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  }

  .feature-card.featured {
      grid-column: span 2;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      color: #fff;
  }

  .feature-card.featured h3,
  .feature-card.featured p {
      color: #fff;
  }

  .feature-card.featured .feature-icon {
      background: rgba(255, 255, 255, 0.2);
      -webkit-background-clip: initial;
      -webkit-text-fill-color: initial;
  }

  .feature-icon {
      font-size: 52px;
      margin-bottom: 24px;
      display: inline-block;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
  }

  .feature-card h3 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      color: #1d1d1f;
  }

  .feature-card p {
      font-size: 17px;
      color: var(--text-secondary);
      line-height: 1.5;
      margin-bottom: 24px;
  }

  .feature-list {
      list-style: none;
      margin-top: 24px;
  }

  .feature-list li {
      padding: 12px 0;
      border-bottom: 1px solid rgba(0, 0, 0, 0.06);
      font-size: 15px;
      color: var(--text-secondary);
      display: flex;
      align-items: center;
      gap: 12px;
  }

  .feature-card.featured .feature-list li {
      border-bottom-color: rgba(255, 255, 255, 0.2);
      color: rgba(255, 255, 255, 0.9);
  }

  .feature-list li:last-child {
      border-bottom: none;
  }

  .feature-list li::before {
      content: '✓';
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      background: var(--accent-green);
      color: #fff;
      border-radius: 50%;
      font-size: 12px;
      flex-shrink: 0;
  }

  .expand-btn {
      margin-top: 24px;
      color: var(--accent-blue);
      font-size: 15px;
      font-weight: 500;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: gap 0.3s;
  }

  .feature-card.featured .expand-btn {
      color: #fff;
  }

  .expand-btn:hover {
      gap: 12px;
  }

  /* ---------------- 交互式联动展示 ---------------- */
  .integration-section {
      background: linear-gradient(to bottom, #ffffff, #f5f5f7);
      padding: 120px 20px;
  }

  .integration-tabs {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 16px;
      margin-top: 60px;
      margin-bottom: 40px;
  }

  .tab-btn {
      padding: 28px 24px;
      background: var(--card-bg);
      border: 2px solid transparent;
      border-radius: 16px;
      text-align: left;
      cursor: pointer;
      transition: all 0.4s var(--ease-apple);
      box-shadow: 0 2px 12px var(--card-shadow);
  }

  .tab-btn h3 {
      font-size: 19px;
      color: var(--text-secondary);
      margin-bottom: 8px;
      font-weight: 600;
      transition: color 0.4s;
  }

  .tab-btn p {
      font-size: 14px;
      color: #86868b;
      line-height: 1.4;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s var(--ease-apple);
  }

  .tab-btn.active {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
      border-color: transparent;
      box-shadow: 0 8px 24px rgba(0, 113, 227, 0.3);
      transform: scale(1.05);
  }

  .tab-btn.active h3 {
      color: #fff;
  }

  .tab-btn.active p {
      max-height: 100px;
      color: rgba(255, 255, 255, 0.9);
  }

  .integration-visual {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 60px 40px;
      box-shadow: 0 8px 32px var(--card-shadow);
      min-height: 500px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
  }

  .flow-diagram {
      display: none;
      width: 100%;
      max-width: 600px;
      margin: 0 auto;
  }

  .flow-diagram.active {
      display: block;
      animation: slideIn 0.6s var(--ease-apple);
  }

  @keyframes slideIn {
      from {
          opacity: 0;
          transform: translateX(30px);
      }

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

  .flow-node {
      background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
      padding: 24px;
      border-radius: 16px;
      margin-bottom: 16px;
      border: 2px solid rgba(0, 0, 0, 0.06);
      transition: all 0.4s var(--ease-apple);
      animation: fadeIn 0.6s var(--ease-apple) backwards;
  }

  .flow-node:nth-child(1) {
      animation-delay: 0.1s;
  }

  .flow-node:nth-child(3) {
      animation-delay: 0.2s;
  }

  .flow-node:nth-child(5) {
      animation-delay: 0.3s;
  }

  .flow-node:nth-child(7) {
      animation-delay: 0.4s;
  }

  @keyframes fadeIn {
      from {
          opacity: 0;
          transform: translateY(20px);
      }

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

  .flow-node:hover {
      transform: translateX(8px);
      box-shadow: 0 4px 16px var(--card-shadow);
      border-color: var(--accent-blue);
  }

  .flow-node-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
  }

  .flow-node-title {
      font-weight: 600;
      font-size: 17px;
      color: #1d1d1f;
  }

  .flow-badge {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
      color: #fff;
      padding: 4px 12px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: 500;
  }

  .flow-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 8px;
  }

  .flow-data {
      font-size: 13px;
      color: var(--accent-blue);
      font-family: 'SF Mono', Monaco, monospace;
      background: rgba(0, 113, 227, 0.08);
      padding: 8px 12px;
      border-radius: 8px;
      margin-top: 8px;
  }

  .flow-arrow {
      text-align: center;
      color: var(--accent-blue);
      font-size: 24px;
      margin: 8px 0;
      animation: pulse 2s ease-in-out infinite;
  }

  @keyframes pulse {

      0%,
      100% {
          opacity: 0.4;
          transform: translateY(0);
      }

      50% {
          opacity: 1;
          transform: translateY(4px);
      }
  }

  /* ---------------- 统计数据 ---------------- */
  .stats-section {
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
      padding: 100px 20px;
      color: #fff;
  }

  .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 60px;
      max-width: 1024px;
      margin: 0 auto;
      text-align: center;
  }

  .stat-item {
      opacity: 0;
      transform: translateY(20px);
      animation: fadeUp 0.8s var(--ease-apple) forwards;
  }

  .stat-item:nth-child(1) {
      animation-delay: 0.1s;
  }

  .stat-item:nth-child(2) {
      animation-delay: 0.2s;
  }

  .stat-item:nth-child(3) {
      animation-delay: 0.3s;
  }

  .stat-item:nth-child(4) {
      animation-delay: 0.4s;
  }

  .stat-number {
      font-size: 56px;
      font-weight: 700;
      margin-bottom: 8px;
      letter-spacing: -0.02em;
  }

  .stat-label {
      font-size: 17px;
      opacity: 0.9;
  }

  /* ---------------- 联系表单 ---------------- */
  .contact-section {
      background: #ffffff;
      padding: 120px 20px;
  }

  .contact-container {
      max-width: 720px;
      margin: 0 auto;
      background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
      border-radius: 32px;
      padding: 64px 48px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(0, 0, 0, 0.06);
  }

  .contact-header {
      text-align: center;
      margin-bottom: 48px;
  }

  .contact-header h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #1d1d1f;
  }

  .contact-header p {
      font-size: 19px;
      color: var(--text-secondary);
  }

  .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
  }

  .input-group {
      position: relative;
      margin-bottom: 8px;
  }

  .input-group.full {
      grid-column: span 2;
  }

  .form-input,
  .form-textarea {
      width: 100%;
      background: #ffffff;
      border: 2px solid rgba(0, 0, 0, 0.1);
      padding: 16px 20px;
      border-radius: 12px;
      color: #1d1d1f;
      font-size: 17px;
      transition: all 0.3s var(--ease-apple);
      font-family: inherit;
  }

  .form-textarea {
      min-height: 120px;
      resize: vertical;
  }

  .form-input:focus,
  .form-textarea:focus {
      outline: none;
      border-color: var(--accent-blue);
      box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
  }

  .form-label {
      position: absolute;
      left: 20px;
      top: 18px;
      color: var(--text-secondary);
      pointer-events: none;
      transition: all 0.3s var(--ease-apple);
      font-size: 17px;
      background: #ffffff;
      padding: 0 4px;
  }

  .form-input:focus+.form-label,
  .form-input:not(:placeholder-shown)+.form-label,
  .form-textarea:focus+.form-label,
  .form-textarea:not(:placeholder-shown)+.form-label {
      top: -10px;
      left: 16px;
      font-size: 13px;
      color: var(--accent-blue);
  }

  .submit-btn {
      width: 100%;
      margin-top: 32px;
      padding: 16px;
      background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
      color: #fff;
      border: none;
      border-radius: 12px;
      font-size: 17px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.4s var(--ease-apple);
      box-shadow: 0 4px 16px rgba(0, 113, 227, 0.3);
  }

  .submit-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 113, 227, 0.4);
  }

  .submit-btn:active {
      transform: translateY(0);
  }

  /* ---------------- 页脚 ---------------- */
  footer {
      background: #1d1d1f;
      padding: 80px 20px 40px;
      color: #f5f5f7;
  }

  .footer-main {
      max-width: 1024px;
      margin: 0 auto;
  }

  .footer-grid {
      display: grid;
      grid-template-columns: 2fr repeat(4, 1fr);
      gap: 60px;
      margin-bottom: 60px;
  }

  .footer-brand {
      max-width: 300px;
  }

  .footer-logo {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
      background: linear-gradient(135deg, #0061ff 0%, #60efff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
  }

  .footer-brand p {
      color: #86868b;
      font-size: 15px;
      line-height: 1.6;
      margin-bottom: 24px;
  }

  .social-links {
      display: flex;
      gap: 16px;
  }

  .social-link {
      width: 40px;
      height: 40px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #f5f5f7;
      text-decoration: none;
      transition: all 0.3s var(--ease-apple);
      font-size: 18px;
  }

  .social-link:hover {
      background: var(--accent-blue);
      transform: translateY(-4px);
  }

  .footer-col h4 {
      color: #f5f5f7;
      margin-bottom: 20px;
      font-size: 14px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.5px;
  }

  .footer-col ul {
      list-style: none;
  }

  .footer-col li {
      margin-bottom: 12px;
  }

  .footer-col a {
      color: #86868b;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.3s;
      display: inline-block;
  }

  .footer-col a:hover {
      color: #f5f5f7;
      transform: translateX(4px);
  }

  .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 32px;
      font-size: 13px;
      color: #86868b;
      flex-wrap: wrap;
      gap: 16px;
  }

  .footer-links {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
  }

  .footer-links a {
      color: #86868b;
      text-decoration: none;
      transition: color 0.3s;
  }

  .footer-links a:hover {
      color: #f5f5f7;
  }

  /* ---------------- 模态框 ---------------- */
  .modal-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.6);
      backdrop-filter: blur(10px);
      z-index: 2000;
      opacity: 0;
      visibility: hidden;
      transition: all 0.4s var(--ease-apple);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
  }

  .modal-overlay.active {
      opacity: 1;
      visibility: visible;
  }

  .modal-content {
      width: 100%;
      max-width: 900px;
      background: #ffffff;
      border-radius: 24px;
      padding: 60px;
      position: relative;
      transform: scale(0.95);
      transition: transform 0.4s var(--ease-apple);
      max-height: 90vh;
      overflow-y: auto;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  }

  .modal-overlay.active .modal-content {
      transform: scale(1);
  }

  .close-modal {
      position: absolute;
      top: 24px;
      right: 24px;
      width: 36px;
      height: 36px;
      background: rgba(0, 0, 0, 0.06);
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: #1d1d1f;
      transition: all 0.3s;
  }

  .close-modal:hover {
      background: rgba(0, 0, 0, 0.1);
      transform: rotate(90deg);
  }

  .modal-body h2 {
      font-size: 40px;
      margin-bottom: 16px;
      color: #1d1d1f;
  }

  .modal-body>p {
      font-size: 19px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      line-height: 1.6;
  }

  .feature-detail-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 32px;
      margin-top: 40px;
  }

  .detail-item {
      padding: 24px;
      background: #f5f5f7;
      border-radius: 16px;
      transition: all 0.3s var(--ease-apple);
  }

  .detail-item:hover {
      transform: translateY(-4px);
      background: linear-gradient(135deg, rgba(0, 113, 227, 0.08), rgba(191, 90, 242, 0.08));
  }

  .detail-item h4 {
      font-size: 21px;
      margin-bottom: 12px;
      color: #1d1d1f;
      display: flex;
      align-items: center;
      gap: 8px;
  }

  .detail-item h4::before {
      content: '→';
      color: var(--accent-blue);
      font-weight: bold;
  }

  .detail-item p {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.6;
  }


  /* ---------------- 滚动动画 ---------------- */
  .reveal {
      opacity: 0;
      transform: translateY(40px);
      transition: all 0.8s var(--ease-apple);
  }

  .reveal.active {
      opacity: 1;
      transform: translateY(0);
  }

  #mainNav {
      background: #fff;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      height: 55px;
  }

  .nav-content {
      max-width: 1200px;
      margin: 0 auto;
      padding: 15px 20px;
      display: flex;
      align-items: center;
      gap: 20px;
  }

  .logo-group {
      display: flex;
      align-items: center;
      gap: 10px;
  }

  .logo {
      width: 110px;
      height: 35px;
  }

  .weixin-logo {
      height: 28px;
      width: auto;
  }

  .nav-links {
      list-style: none;
      display: flex;
      align-items: center;
      gap: 30px;
      margin-left: auto;
  }

  .nav-links li {
      position: relative;
  }

  .nav-links a {
      color: #333;
      text-decoration: none;
      font-size: 15px;
      transition: color 0.3s;
  }

  .nav-links a:hover {
      color: #1890ff;
  }

  .login-btn {
      background: #1890ff;
      color: #fff !important;
      padding: 8px 20px;
      border-radius: 4px;
      transition: background 0.3s;
  }

  .login-btn:hover {
      background: #40a9ff;
  }

  .dropdown {
      position: relative;
  }

  .dropdown-content {
      display: none;
      position: absolute;
      top: 100%;
      right: 0;
      margin-top: 10px;
      background: #fff;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      border-radius: 8px;
      padding: 20px;
      min-width: 300px;
      z-index: 1001;
  }

  .dropdown:hover .dropdown-content {
      display: block;
  }

  .download-item {
      padding: 15px;
      border-bottom: 1px solid #f0f0f0;
  }

  .download-item:last-child {
      border-bottom: none;
  }

  .download-item p {
      color: #666;
      font-size: 14px;
      line-height: 1.6;
      margin-bottom: 12px;
      text-align: center;
  }

  .download-item a {
      display: inline-block;
  }

  .download-item img {
      display: block;
      max-width: 100%;
      height: auto;
  }

  @media (max-width: 768px) {
      .nav-content {
          flex-wrap: wrap;
      }

      .nav-links {
          width: 100%;
          justify-content: space-around;
          margin-left: 0;
          margin-top: 10px;
      }

      .dropdown-content {
          min-width: 300px;
          right: auto;
          left: 50%;
          transform: translateX(-50%);
      }
  }

  .side-buttons {
      position: fixed;
      right: 20px;
      top: 50%;
      transform: translateY(-50%);
      width: 50px;
      display: flex;
      flex-direction: column;
      align-items: center;
      background-color: #f8f9fc;
      border-radius: 25px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      padding: 12px 0;
      z-index: 999;
  }

  .side-button {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      width: 100%;
      padding: 10px 0;
      cursor: pointer;
      position: relative;
  }

  .side-button img {
      width: 20px;
      height: 20px;
      margin-bottom: 5px;
  }

  .side-button span {
      font-size: 12px;
      color: #666;
  }

  .side-button-text {
      position: absolute;
      right: 55px;
      background-color: #fff;
      padding: 5px 10px;
      border-radius: 4px;
      font-size: 12px;
      display: none;
      white-space: nowrap;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }

  .side-button:hover .side-button-text {
      display: block;
  }

  .back-to-top {
      width: 36px;
      height: 36px;
      background-color: #4080ff;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      color: white;
      margin-top: 10px;
      cursor: pointer;
  }

  .back-to-top-arrow {
      border: solid white;
      border-width: 0 2px 2px 0;
      display: inline-block;
      padding: 3px;
      transform: rotate(-135deg);
  }

  .animate-bounce {
      animation: bounce 1s ease infinite;
  }

  .modal-container {
      position: relative;
      width: 420px;
      padding: 30px;
      background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), #f8f9ff);
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(64, 128, 255, 0.15);
      transform: translateY(20px);
      animation: slideUp 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
      border: 1px solid rgba(255, 255, 255, 0.2);
      backdrop-filter: blur(10px);
  }

  .modal-header {
      text-align: center;
      margin-bottom: 20px;
  }

  .modal-title {
      font-size: 24px;
      color: #2b5876;
      margin-bottom: 8px;
      font-weight: 600;
      background: linear-gradient(45deg, #2b5876, #4e4376);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
  }

  .modal-content {
      text-align: center;
      font-size: 16px;
      color: #666;
      line-height: 1.6;
      margin-bottom: 25px;
  }

  .modal-actions {
      display: flex;
      justify-content: center;
      gap: 15px;
  }

  .modal-button {
      padding: 12px 30px;
      border-radius: 8px;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.3s ease;
  }

  .modal-confirm {
      background: linear-gradient(45deg, #4080ff, #6b8cff);
      color: white;
      border: none;
  }

  .modal-confirm:hover {
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(64, 128, 255, 0.3);
  }

  /* 自定义弹窗样式 */
  .modal-mask {
      position: fixed;
      z-index: 9998;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      display: flex;
      justify-content: center;
      align-items: center;
      animation: fadeIn 0.3s ease;
  }

  /* 确保下拉菜单的基本样式 */
  .dropdown {
      position: relative;
  }

  .dropdown-content {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      background-color: white;
      min-width: 200px;
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
      z-index: 1000;
      border-radius: 4px;
      margin-top: 10px;
  }

  .dropdown:hover .dropdown-content {
      display: block;
  }

  /* 解决方案菜单样式 */
  .solution-menu {
      list-style: none;
      padding: 10px 0;
      margin: 0;
  }

  .solution-menu li {
      padding: 0;
  }

  .solution-menu li a {
      display: block;
      padding: 12px 20px;
      color: #333;
      text-decoration: none;
      transition: background-color 0.3s;
  }

  .solution-menu li a:hover {
      background-color: #f5f5f5;
      color: #0066cc;
  }

  /* 下载中心样式 */
  .download-item {
      padding: 15px 20px;
      border-bottom: 1px solid #eee;
  }

  .download-item:last-child {
      border-bottom: none;
  }

  .download-item p {
      margin: 0 0 10px 0;
      color: #666;
      font-size: 14px;
  }

  .solution-menu {
      list-style: none;
      padding: 0;
      margin: 0;
  }

  .solution-menu li {
      padding: 0;
  }

  .solution-menu a {
      display: block;
      padding: 10px 15px;
      color: #333;
      text-decoration: none;
      transition: background 0.3s;
  }

  .solution-menu a:hover {
      background: #f5f5f5;
      color: #1890ff;
  }