/* roulang page: index */
:root {
      --deep-navy: #0A2E4A;
      --bronze-gold: #C8963E;
      --steel-blue: #1C5D7D;
      --cold-white: #F8F9FB;
      --card-white: #FFFFFF;
      --faq-bg: #EDF1F5;
      --footer-bg: #1A2B3C;
      --footer-text: #B0C4DE;
      --text-primary: #1e2b3c;
      --text-secondary: #5e6f82;
      --border-light: #e9edf2;
      --shadow-sm: 0 4px 20px rgba(10,46,74,0.06);
      --shadow-md: 0 8px 30px rgba(10,46,74,0.12);
      --radius-card: 12px;
      --radius-btn: 6px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--cold-white);
      color: var(--text-primary);
      line-height: 1.8;
      font-weight: 400;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航基础 */
    .top-bar-wrapper {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: #fff;
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      transition: var(--transition);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 60px;
      padding: 0 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      color: var(--deep-navy);
    }
    .logo-text span {
      color: var(--bronze-gold);
    }
    .brand-actions {
      display: flex;
      align-items: center;
      gap: 1.25rem;
    }
    .hotline {
      font-size: 0.9rem;
      color: var(--text-secondary);
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .search-icon {
      font-size: 1.1rem;
      color: var(--deep-navy);
      cursor: pointer;
    }
    .channel-bar {
      background: var(--deep-navy);
      height: 44px;
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      padding: 0 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
      transition: max-height 0.3s ease;
    }
    .channel-bar a {
      color: white;
      font-size: 0.9rem;
      font-weight: 500;
      margin-right: 2rem;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .channel-bar a:hover,
    .channel-bar a.active {
      border-bottom-color: var(--bronze-gold);
      color: #fff;
    }
    .hot-tag {
      background: var(--bronze-gold);
      color: #fff;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-left: 0.5rem;
    }
    /* 吸顶状态 */
    .sticky-active .channel-bar {
      max-height: 0;
      overflow: hidden;
      padding-top: 0;
      padding-bottom: 0;
    }
    .sticky-active .brand-row {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--deep-navy);
      cursor: pointer;
    }
    /* Hero */
    #hero {
      padding-top: 104px;
      min-height: calc(100vh - 104px);
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(10,46,74,0.03) 0%, rgba(28,93,125,0.02) 100%);
      position: relative;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 350px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--deep-navy);
      line-height: 1.3;
      margin-bottom: 1.2rem;
      position: relative;
      padding-left: 1.5rem;
    }
    .hero-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0.2rem;
      height: 2.4rem;
      width: 4px;
      background: var(--bronze-gold);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--bronze-gold);
      color: #fff;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      background: #B07D2E;
      transform: scale(1.02);
      color: #fff;
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--deep-navy);
      color: var(--deep-navy);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: var(--deep-navy);
      color: #fff;
    }
    .dynamic-stats {
      display: flex;
      gap: 2rem;
      margin-top: 2.5rem;
      font-weight: 700;
      color: var(--steel-blue);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--deep-navy);
      margin-bottom: 0.75rem;
    }
    .section-lead {
      color: var(--text-secondary);
      margin-bottom: 3rem;
    }
    /* 优势卡片不对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
      gap: 30px;
    }
    .adv-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .adv-card i {
      font-size: 2.2rem;
      color: var(--bronze-gold);
      margin-bottom: 1rem;
    }
    .adv-card h3 {
      font-weight: 700;
      font-size: 1.4rem;
    }
    .data-highlight {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--steel-blue);
      margin-top: 0.5rem;
    }
    /* 业务卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .service-card {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      height: 280px;
      position: relative;
      overflow: hidden;
      color: #fff;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 1.5rem;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(10,46,74,0.8) 10%, rgba(10,46,74,0.2) 80%);
      transition: var(--transition);
    }
    .service-card:hover .service-overlay {
      background: linear-gradient(0deg, rgba(10,46,74,0.6) 10%, rgba(10,46,74,0.1) 80%);
    }
    .service-content {
      position: relative;
      z-index: 2;
    }
    /* 数据里程碑 */
    .milestone-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding: 1rem 0;
    }
    .milestone-item {
      min-width: 180px;
      text-align: center;
    }
    .milestone-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-navy);
      font-family: 'DIN Alternate', 'Noto Sans SC', sans-serif;
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .case-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      cursor: pointer;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-tag {
      background: var(--bronze-gold);
      color: #fff;
      font-size: 0.7rem;
      padding: 0.2rem 0.7rem;
      border-radius: 20px;
      display: inline-block;
      margin: 1rem 1rem 0;
    }
    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      margin-bottom: 4rem;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
      background: #e0e8ef;
      border-radius: var(--radius-card);
      min-height: 250px;
      background-size: cover;
    }
    /* FAQ */
    .accordion-faq .accordion-item {
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      box-shadow: var(--shadow-sm);
    }
    .accordion-title {
      font-weight: 700;
      padding: 1.2rem 1.5rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--deep-navy);
    }
    .accordion-content {
      padding: 0 1.5rem 1.5rem;
      color: var(--text-secondary);
    }
    /* CTA */
    .cta-dark {
      background: var(--deep-navy);
      color: #fff;
      text-align: center;
    }
    .partner-logos img {
      height: 40px;
      filter: grayscale(1);
      opacity: 0.7;
      margin: 0 1rem;
      transition: var(--transition);
    }
    .partner-logos img:hover {
      filter: none;
      opacity: 1;
    }
    /* footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    /* 移动端 */
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .service-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .channel-bar { display: none; }
      .hamburger { display: block; }
      .brand-actions .hotline { display: none; }
      .hero-content { flex-direction: column; }
      .hero-title { font-size: 2rem; }
      .advantages-grid, .service-grid, .cases-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }