/* roulang page: index */
:root {
      --red: #E63946;
      --red-dark: #C1121F;
      --black: #1D1D1D;
      --gold: #F4A261;
      --gray-bg: #F2F2F2;
      --white: #FFFFFF;
      --gray-text: #6C6C6C;
      --border-light: #E6E6E6;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Roboto", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background: #FAFAFA;
      color: var(--black);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航卡片面板 */
    .nav-panel {
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      padding: 12px 24px;
      margin-top: 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      position: sticky;
      top: 12px;
      z-index: 40;
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
      border: 1px solid var(--border-light);
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--red);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-item {
      background: var(--gray-bg);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.2s ease;
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--black);
      white-space: nowrap;
      border: 1px solid transparent;
    }

    .nav-item i {
      color: var(--red);
      font-size: 1rem;
    }

    .nav-item:hover {
      background: var(--white);
      border-color: var(--red);
      color: var(--red);
      box-shadow: var(--shadow-sm);
    }

    .btn-primary {
      background: var(--red);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border: none;
      cursor: pointer;
      white-space: nowrap;
      box-shadow: 0 4px 10px rgba(230,57,70,0.2);
    }

    .btn-primary:hover {
      background: var(--red-dark);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--black);
      color: var(--black);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-outline:hover {
      background: var(--black);
      color: white;
    }

    .btn-gold {
      background: var(--gold);
      color: var(--black);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      border: none;
      transition: 0.2s;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 1.1rem;
    }

    .btn-gold:hover {
      background: var(--red);
      color: white;
    }

    section {
      padding: 80px 0;
    }

    /* 桌面导航活动状态 */
    .nav-item.active {
      background: var(--red);
      color: white;
      border-color: var(--red);
    }
    .nav-item.active i {
      color: white;
    }

    /* 汉堡菜单隐藏桌面 */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--black);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        background: white;
        padding: 16px;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-hover);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-panel {
        flex-wrap: wrap;
        justify-content: space-between;
      }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: var(--gray-text);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-img-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    .hero-img-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2rem;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--red);
      margin-top: 8px;
      border-radius: 2px;
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .adv-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid transparent;
      transition: all 0.25s;
    }
    .adv-card:hover {
      border-left-color: var(--red);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--gold);
      margin-bottom: 18px;
    }
    .adv-card h3 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .biz-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      margin-top: 32px;
    }
    .biz-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      flex-shrink: 0;
      transition: 0.2s;
    }
    .biz-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .biz-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    .biz-content {
      padding: 20px;
    }
    .biz-content h3 {
      font-weight: 700;
    }
    .data-highlight {
      font-family: var(--font-number);
      font-size: 2rem;
      font-weight: 700;
      color: var(--gold);
    }

    .testimonial-card {
      background: var(--gray-bg);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .quote-icon {
      font-size: 3rem;
      color: var(--red);
    }
    .testimonial-text {
      font-size: 1.3rem;
      font-style: italic;
      margin-bottom: 16px;
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 32px;
    }
    .faq-item {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 0;
      overflow: hidden;
      transition: 0.2s;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--gray-text);
    }
    .faq-item.open .faq-answer {
      display: block;
      border-left: 4px solid var(--red);
      margin-left: 4px;
    }

    .cta-dark {
      background: var(--black);
      border-radius: var(--radius-lg);
      padding: 64px 24px;
      text-align: center;
      color: white;
    }

    footer {
      background: var(--black);
      color: #ccc;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    @media (max-width: 768px) {
      .card-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .testimonial-card { flex-direction: column; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }