/* roulang page: index */
:root {
      --deep-blue: #0A2540;
      --deep-blue-soft: #0B2B4A;
      --gold: #C5A028;
      --gold-hover: #D4AF37;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-subtle: #F1F5F9;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --text-on-dark: #F8FAFC;
      --card-shadow: 0 8px 20px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.02);
      --card-shadow-hover: 0 18px 32px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.02);
      --border-radius-card: 18px;
      --border-radius-btn: 12px;
      --transition-smooth: all 0.3s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      padding: 16px 0;
      transition: var(--transition-smooth);
      background: transparent;
    }

    .navbar.scrolled {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.7rem;
      color: white;
      text-decoration: none;
      letter-spacing: -0.3px;
      transition: color 0.2s;
    }

    .navbar.scrolled .logo {
      color: var(--deep-blue);
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--gold);
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
      transition: transform 0.2s;
    }

    .logo:hover .logo-icon {
      transform: scale(1.05);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      transition: color 0.2s;
      font-size: 1rem;
      position: relative;
    }

    .navbar.scrolled .nav-links a {
      color: var(--text-primary);
    }

    .nav-links a:hover {
      color: var(--gold);
    }

    .nav-cta {
      background: var(--gold);
      color: #0A2540 !important;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700;
      box-shadow: 0 6px 14px rgba(197,160,40,0.3);
      transition: var(--transition-smooth);
    }

    .nav-cta:hover {
      background: var(--gold-hover);
      transform: translateY(-2px);
      color: #0A2540 !important;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 4px;
      transition: 0.2s;
    }

    .navbar.scrolled .hamburger span {
      background: var(--deep-blue);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
        border-radius: 0 0 24px 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .navbar.scrolled .nav-links {
        background: rgba(255,255,255,0.98);
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,37,64,0.8) 0%, rgba(11,43,74,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 95vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }

    .hero-content {
      max-width: 720px;
      margin-top: 40px;
    }

    .hero h1 {
      font-size: clamp(2.6rem, 6vw, 4.2rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      text-shadow: 0 8px 18px rgba(0,0,0,0.3);
    }

    .hero .gold-highlight {
      color: var(--gold);
      display: inline-block;
    }

    .hero p {
      font-size: 1.3rem;
      margin-bottom: 36px;
      color: rgba(255,255,255,0.85);
      max-width: 560px;
    }

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

    .btn-primary {
      background: var(--gold);
      color: #0A2540;
      padding: 14px 38px;
      border-radius: 40px;
      font-weight: 700;
      text-decoration: none;
      font-size: 1.1rem;
      box-shadow: 0 10px 20px rgba(197,160,40,0.4);
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--gold-hover);
      transform: translateY(-3px);
      box-shadow: 0 16px 28px rgba(197,160,40,0.5);
    }

    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 38px;
      border-radius: 40px;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

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

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    .gold-line {
      width: 60px;
      height: 4px;
      background: var(--gold);
      margin: 16px auto 32px;
      border-radius: 4px;
    }

    /* 不对称卡片布局 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.9fr;
      gap: 28px;
      align-items: start;
    }

    .feature-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 36px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }

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

    .feature-large {
      background: linear-gradient(145deg, #ffffff 0%, #f9fcff 100%);
    }

    .feature-icon {
      font-size: 2.8rem;
      color: var(--gold);
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--deep-blue);
    }

    .side-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

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

    /* 产品展示横向卡片 */
    .showcase-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }

    .showcase-card {
      flex: 0 0 280px;
      background: white;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      scroll-snap-align: start;
      transition: var(--transition-smooth);
    }

    .showcase-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .showcase-text {
      padding: 20px;
    }

    /* 数据信任 */
    .trust-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      text-align: center;
      margin-top: 32px;
    }

    .trust-item .number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--deep-blue);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 22px 28px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      border-left: 5px solid var(--gold);
    }

    .faq-answer {
      padding: 0 28px 22px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA 深色块 */
    .cta-dark {
      background: var(--deep-blue);
      color: white;
      text-align: center;
      border-radius: 32px;
      padding: 70px 32px;
      margin: 40px 0;
    }

    footer {
      background: var(--deep-blue);
      color: rgba(255,255,255,0.7);
      text-align: center;
      padding: 40px 0;
      font-size: 0.95rem;
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 20px;
      }
    }