/* roulang page: index */
:root {
      --cloud-white: #F7F9FC;
      --dawn-blue: #0F4C5C;
      --flow-gray: #8E9AAF;
      --morning-gold: #C9A96E;
      --deep-gray: #4A5568;
      --pure-white: #FFFFFF;
      --soft-bg: #F2F4F8;
      --footer-bg: #2D3748;
      --footer-text: #A0AEC0;
      
      --card-shadow: 0 4px 20px rgba(15, 76, 92, 0.04);
      --card-hover-shadow: 0 12px 32px rgba(15, 76, 92, 0.08);
      --border-radius: 12px;
      --transition-default: all 0.3s ease;
      
      --container-max: 1200px;
      --section-padding: 100px 24px;
      --section-padding-mobile: 70px 20px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--cloud-white);
      color: var(--deep-gray);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.8);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(15, 76, 92, 0.05);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .header.scrolled {
      background: var(--pure-white);
      box-shadow: 0 2px 16px rgba(15, 76, 92, 0.06);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--dawn-blue);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 28px;
      color: var(--morning-gold);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--flow-gray);
      padding: 8px 0;
      position: relative;
      letter-spacing: 0.5px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--dawn-blue);
      transition: width 0.3s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--dawn-blue);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dawn-blue);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--cloud-white);
        flex-direction: column;
        gap: 0;
        padding: 20px 0;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.4s ease, opacity 0.3s ease;
        border-bottom: 1px solid rgba(15,76,92,0.1);
      }
      .nav-links.open {
        transform: translateY(0);
        opacity: 1;
      }
      .nav-links a {
        padding: 16px 24px;
        width: 100%;
        border-bottom: 1px solid rgba(15,76,92,0.05);
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 首屏 Hero */
    .hero {
      background: linear-gradient(135deg, #F2F4F8 0%, #F7F9FC 100%);
      padding: 160px 24px 120px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      right: -10%;
      top: 10%;
      width: 600px;
      height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/contain no-repeat;
      opacity: 0.15;
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-size: clamp(36px, 5vw, 56px);
      font-weight: 700;
      color: var(--dawn-blue);
      line-height: 1.2;
      letter-spacing: 2px;
      margin-bottom: 24px;
    }
    .hero h1 span {
      color: var(--morning-gold);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--flow-gray);
      margin-bottom: 40px;
      max-width: 480px;
      line-height: 1.7;
    }
    .btn-primary {
      display: inline-block;
      background: var(--morning-gold);
      color: var(--dawn-blue);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 16px;
      letter-spacing: 1px;
      transition: var(--transition-default);
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(201, 169, 110, 0.2);
    }
    .btn-primary:hover {
      background: #b8944f;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(201, 169, 110, 0.3);
    }
    .hero-visual {
      flex: 1 1 50%;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-width: 90%;
      border-radius: 32px;
      box-shadow: 0 25px 50px rgba(15, 76, 92, 0.08);
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-visual img {
        max-width: 80%;
      }
    }

    /* 板块通用 */
    section {
      padding: var(--section-padding);
    }
    .section-title {
      text-align: center;
      margin-bottom: 64px;
    }
    .section-title h2 {
      font-size: 38px;
      font-weight: 600;
      color: var(--dawn-blue);
      margin-bottom: 16px;
      letter-spacing: 1px;
    }
    .section-title .gold-line {
      width: 50px;
      height: 3px;
      background: var(--morning-gold);
      margin: 0 auto;
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .adv-card {
      background: var(--pure-white);
      padding: 40px 28px;
      border-radius: var(--border-radius);
      box-shadow: var(--card-shadow);
      transition: var(--transition-default);
      text-align: left;
      position: relative;
      border: 1px solid rgba(15,76,92,0.04);
    }
    .adv-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-6px);
      border-color: var(--morning-gold);
    }
    .adv-icon {
      font-size: 32px;
      color: var(--dawn-blue);
      margin-bottom: 24px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--dawn-blue);
      margin-bottom: 14px;
    }
    .adv-card p {
      color: var(--flow-gray);
      line-height: 1.7;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据区 */
    .data-section {
      background: var(--pure-white);
    }
    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
    }
    .data-item {
      text-align: center;
    }
    .data-number {
      font-size: 52px;
      font-weight: 700;
      color: var(--morning-gold);
    }
    .data-label {
      color: var(--flow-gray);
      font-size: 16px;
      margin-top: 8px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: white;
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition-default);
    }
    .service-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-6px);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-img::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: linear-gradient(to top, rgba(15,76,92,0.7), transparent);
    }
    .service-content {
      padding: 24px;
    }
    .service-content h3 {
      font-size: 20px;
      color: var(--dawn-blue);
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      border: 2px solid var(--flow-gray);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      color: var(--flow-gray);
      margin: 0 auto 16px;
      transition: 0.3s;
    }
    .step.active .step-circle, .step:hover .step-circle {
      background: var(--dawn-blue);
      border-color: var(--dawn-blue);
      color: white;
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition-default);
    }
    .case-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .case-img {
      height: 200px;
      background-size: cover;
    }
    .case-info {
      padding: 24px;
    }
    .case-tag {
      background: transparent;
      border: 1px solid var(--dawn-blue);
      color: var(--dawn-blue);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(15,76,92,0.1);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      color: var(--dawn-blue);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--flow-gray);
      margin-top: 8px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    .cta-band {
      background: var(--dawn-blue);
      text-align: center;
      padding: 80px 24px;
    }
    .cta-band h2 {
      color: white;
      font-size: 36px;
      margin-bottom: 24px;
    }
    .btn-light {
      background: var(--morning-gold);
      color: var(--dawn-blue);
      padding: 14px 40px;
      border-radius: 40px;
      font-weight: 600;
    }

    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 24px 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }