/* roulang page: index */
:root {
      --bs-primary: #E63946;
      --bs-primary-dark: #C1121F;
      --color-gold: #F4A261;
      --color-dark: #1D1D1F;
      --color-body: #4A4A4D;
      --color-muted: #8E8E93;
      --color-bg: #FAFAF8;
      --color-white: #FFFFFF;
      --color-border: #E5E5E7;
      --color-light-bg: #F5F5F7;
      --bs-border-radius: 16px;
      --bs-btn-border-radius: 30px;
      --bs-body-color: #4A4A4D;
      --bs-body-bg: #FAFAF8;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--color-dark);
    }
    p {
      max-width: 680px;
    }
    a {
      text-decoration: none;
      color: var(--color-dark);
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--bs-primary);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .navbar-custom {
      background: var(--color-white);
      border-bottom: 1px solid var(--color-border);
      padding: 12px 0;
      transition: box-shadow 0.4s ease;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 1000;
    }
    .navbar-scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .logo-text {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--color-dark);
    }
    .logo-text span {
      color: var(--bs-primary);
    }
    .nav-link-anchor {
      color: var(--color-body);
      font-weight: 500;
      margin: 0 12px;
      position: relative;
      transition: color 0.3s;
      font-size: 0.95rem;
    }
    .nav-link-anchor:hover {
      color: var(--bs-primary);
    }
    .search-box {
      background: var(--color-light-bg);
      border-radius: 30px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      width: 220px;
      transition: width 0.3s ease, border 0.2s;
      border: 1px solid transparent;
    }
    .search-box:focus-within {
      width: 280px;
      border-color: var(--bs-primary);
      background: var(--color-white);
      box-shadow: 0 0 0 3px rgba(230,57,70,0.1);
    }
    .search-box i {
      color: var(--color-muted);
      margin-right: 8px;
      font-size: 14px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 100%;
      font-size: 0.9rem;
    }
    .search-box input::placeholder {
      color: var(--color-muted);
      font-weight: 400;
    }
    .mobile-search-icon {
      display: none;
      font-size: 1.4rem;
      color: var(--color-dark);
      cursor: pointer;
    }
    @media (max-width: 992px) {
      .navbar-collapse-mobile {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        padding: 20px;
        box-shadow: var(--shadow-md);
        flex-direction: column;
        align-items: flex-start;
      }
      .search-box {
        width: 100%;
        margin: 10px 0;
      }
      .mobile-search-icon {
        display: block;
      }
      .desktop-search {
        display: none;
      }
      .nav-link-anchor {
        margin: 8px 0;
      }
    }
    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background: var(--color-bg);
    }
    .hero-title {
      font-size: 56px;
      font-weight: 700;
      color: var(--color-dark);
      margin-bottom: 20px;
    }
    .hero-badge {
      background: var(--bs-primary);
      color: white;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--color-body);
      margin-bottom: 32px;
    }
    .btn-primary-custom {
      background: var(--bs-primary);
      border: none;
      color: white;
      border-radius: 30px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      background: var(--bs-primary-dark);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline-dark-custom {
      background: transparent;
      border: 1px solid var(--color-dark);
      color: var(--color-dark);
      border-radius: 30px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.3s ease;
    }
    .btn-outline-dark-custom:hover {
      background: var(--color-dark);
      color: white;
    }
    .hero-image {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
    }
    /* 区块标题 */
    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 20px;
      color: var(--color-muted);
      font-weight: 400;
    }
    /* 卡片 */
    .feature-card {
      background: var(--color-white);
      border-radius: 16px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.35s ease;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .icon-circle {
      font-size: 40px;
      color: var(--bs-primary);
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 22px;
      font-weight: 700;
      color: var(--color-dark);
    }
    .gold-border {
      border-top: 3px solid var(--color-gold);
    }
    .price-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--color-dark);
    }
    .faq-question {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-dark);
    }
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--bs-primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .footer-dark {
      background: var(--color-dark);
      color: var(--color-muted);
      padding: 60px 0 30px;
    }
    .footer-dark a {
      color: var(--color-muted);
    }
    .footer-dark a:hover {
      color: var(--bs-primary);
    }
    .cta-section {
      background: var(--color-dark);
      padding: 80px 0;
      position: relative;
    }
    .btn-gold {
      background: var(--color-gold);
      color: var(--color-dark);
      font-weight: 700;
      border-radius: 30px;
      padding: 16px 36px;
      transition: 0.3s;
    }
    .btn-gold:hover {
      background: #e0893f;
      color: black;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
      .section-title {
        font-size: 28px;
      }
      .hero-section {
        padding: 120px 0 60px;
      }
    }