/* roulang page: index */
:root {
      --primary: #0A1A2F;
      --accent: #D4AF37;
      --bg-warm: #F5F5F0;
      --card-bg: #FFFFFF;
      --light-gray: #EAE8E3;
      --text-dark: #1A1A1A;
      --text-muted: #666666;
      --text-light: #CCCCCC;
      --danger: #C0392B;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(10,26,47,0.06);
      --shadow-hover: 0 8px 24px rgba(10,26,47,0.10);
      --radius-card: 8px;
      --radius-btn: 4px;
      --transition: 0.25s ease;
      --max-width: 1280px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background var(--transition), backdrop-filter var(--transition);
      padding: 16px 0;
    }

    .main-header.scrolled {
      background: rgba(10, 26, 47, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      flex-direction: column;
      gap: 5px;
      z-index: 1001;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 36px;
        transition: right 0.3s ease;
        box-shadow: -4px 0 20px rgba(0,0,0,0.25);
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
      }
      .nav-links a {
        font-size: 20px;
      }
    }

    /* 首屏 Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      background: linear-gradient(0.65deg, rgba(10,26,47,0.75) 0%, rgba(10,26,47,0.65) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: flex-start;
      color: var(--white);
      position: relative;
    }

    .hero-content {
      max-width: 650px;
      padding: 0 24px;
      margin-top: 60px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 19px;
      opacity: 0.85;
      margin-bottom: 40px;
      font-weight: 400;
    }

    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      font-size: 16px;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: #C4A030;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--white);
      color: var(--white);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition), color var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    @media (max-width: 768px) {
      .hero {
        justify-content: center;
        text-align: center;
      }
      .hero-content {
        margin-top: 0;
      }
      .hero h1 {
        font-size: 36px;
      }
      .btn-group {
        flex-direction: column;
        align-items: center;
        width: 100%;
      }
      .btn-primary, .btn-outline {
        width: 80%;
        padding: 16px 20px;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 34px;
      font-weight: 700;
      color: var(--primary);
      text-align: center;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .gold-line {
      width: 50px;
      height: 3px;
      background: var(--accent);
      margin: 0 auto 48px;
    }

    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: var(--white);
      padding: 32px 20px;
      border-radius: var(--radius-card);
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .stat-number {
      font-family: "DIN Alternate", "PingFang SC", sans-serif;
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .stat-label {
      font-size: 15px;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
    }

    /* 服务矩阵 2x3 */
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-icon {
      font-size: 48px;
      color: var(--accent);
      margin-bottom: 24px;
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 14px;
    }

    .service-card p {
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.6;
    }

    .small-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 24px;
    }

    .small-card {
      background: #F8F8F6;
      padding: 28px 20px;
      border-radius: var(--radius-card);
      text-align: center;
      transition: var(--transition);
    }

    .small-card:hover {
      background: var(--white);
      box-shadow: var(--shadow-sm);
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .small-cards {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .small-cards {
        grid-template-columns: 1fr;
      }
    }

    /* 对比优势 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .compare-col {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .compare-col h3 {
      font-size: 24px;
      margin-bottom: 28px;
      color: var(--primary);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 20px;
      font-size: 16px;
    }

    .check {
      color: #2e7d32;
      font-weight: 700;
    }

    .cross {
      color: #999;
    }

    @media (max-width: 768px) {
      .compare-wrapper {
        grid-template-columns: 1fr;
      }
    }

    /* 安全保障 */
    .safety-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: #F8F8F6;
      padding: 40px;
      border-radius: var(--radius-card);
    }

    .safety-item {
      text-align: center;
    }

    .safety-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .safety-item h4 {
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--primary);
    }

    .safety-item p {
      font-size: 14px;
      color: #888;
    }

    @media (max-width: 768px) {
      .safety-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

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

    /* FAQ */
    .faq-group {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 14px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background var(--transition);
    }

    .faq-item.active .faq-question {
      color: var(--accent);
      background: rgba(212,175,55,0.05);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 28px;
      color: #555;
      font-size: 15px;
    }

    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 0 28px 20px;
    }

    .arrow {
      transition: transform 0.25s;
    }

    .faq-item.active .arrow {
      transform: rotate(180deg);
    }

    /* CTA 区域 */
    .cta-section {
      background: var(--primary);
      text-align: center;
      padding: 80px 24px;
    }

    .cta-section h2 {
      color: white;
      font-size: 34px;
      margin-bottom: 18px;
    }

    .cta-sub {
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      font-size: 18px;
    }

    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 0 auto;
      gap: 12px;
    }

    .cta-form input {
      flex: 1;
      padding: 16px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
    }

    .cta-form input:focus {
      box-shadow: 0 0 0 2px rgba(212,175,55,0.5);
    }

    @media (max-width: 640px) {
      .cta-form {
        flex-direction: column;
      }
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CCC;
      padding: 60px 24px 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      max-width: var(--max-width);
      margin: 0 auto 40px;
    }

    .footer h4 {
      color: white;
      margin-bottom: 18px;
      font-size: 18px;
    }

    .footer a:hover {
      color: var(--accent);
    }

    .copyright {
      text-align: center;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      font-size: 14px;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

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

    .mobile-float {
      display: none;
    }

    @media (max-width: 768px) {
      .mobile-float {
        display: flex;
        position: fixed;
        bottom: 20px;
        right: 20px;
        background: var(--accent);
        color: var(--primary);
        width: 56px;
        height: 56px;
        border-radius: 50%;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        box-shadow: 0 6px 18px rgba(0,0,0,0.3);
        z-index: 999;
        font-size: 20px;
      }
    }