/* roulang page: index */
@layer base {
      :root {
        --primary: #E8451E;
        --primary-dark: #D13D16;
        --secondary: #1A1D29;
        --accent: #0EA5E9;
        --success: #10B981;
        --bg-warm: #F5F0EB;
        --text-primary: #1A1D29;
        --text-secondary: #4a4d59;
        --border-light: #E5E0DB;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
        --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
        --radius-card: 12px;
        --radius-btn: 8px;
        --radius-tag: 6px;
        --radius-dock: 16px;
      }
      *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
      body {
        font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        line-height: 1.75;
        font-size: 16px;
        background-color: var(--bg-warm);
        color: var(--text-primary);
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
      }
      img {
        max-width: 100%;
        height: auto;
        display: block;
      }
      a {
        color: inherit;
        text-decoration: none;
        transition: color 0.2s ease;
      }
      button, input, textarea {
        font-family: inherit;
        font-size: inherit;
        outline: none;
        border: none;
        background: none;
      }
      :focus-visible {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
        border-radius: 2px;
      }
      .container {
        max-width: 1280px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
      }
      @media (max-width: 1024px) {
        .container { padding-left: 1.25rem; padding-right: 1.25rem; }
      }
      @media (max-width: 768px) {
        .container { padding-left: 1rem; padding-right: 1rem; }
      }
    }

    /* 浮动Dock导航 */
    .nav-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: min(92%, 960px);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: 16px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
      z-index: 1000;
      padding: 0 20px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: background 0.3s, box-shadow 0.3s;
      border: 1px solid rgba(255,255,255,0.5);
    }
    .nav-dock.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 8px 28px rgba(0,0,0,0.12);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--secondary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 1.8rem;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta-btn {
      background: var(--primary);
      color: white;
      padding: 0.5rem 1.4rem;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .nav-cta-btn:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-md);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 4px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--secondary);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100vh;
      background: white;
      z-index: 999;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      font-size: 1.4rem;
      font-weight: 600;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s;
    }
    .mobile-menu.open {
      display: flex;
      opacity: 1;
      pointer-events: auto;
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta-btn { display: none; }
      .hamburger { display: flex; }
      .nav-dock { width: 92%; padding: 0 18px; }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.7rem 1.8rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
      border: 2px solid transparent;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-md);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.7rem 1.8rem;
      border: 2px solid var(--primary);
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .text-link:hover { color: var(--secondary); }

    /* 内容卡片 */
    .card {
      background: white;
      border-radius: 12px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
      border-color: rgba(232, 69, 30, 0.25);
    }
    .card-img {
      border-radius: 12px 12px 0 0;
      overflow: hidden;
      aspect-ratio: 16/9;
      background: #E8E3DE;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* FAQ手风琴 */
    .faq-item {
      background: white;
      border-radius: 12px;
      border: 1px solid var(--border-light);
      padding: 0;
      margin-bottom: 0.75rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      background: #fafaf8;
      padding: 0 1.5rem;
      color: var(--text-secondary);
      border-left: 3px solid var(--primary);
      margin-left: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 1rem 1.5rem;
    }
    .faq-arrow {
      transition: transform 0.3s;
      font-size: 1.2rem;
      color: var(--primary);
    }
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* 数字滚动占位 */
    .data-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 2.5rem;
      color: var(--primary);
      line-height: 1.2;
    }

    /* Hero 背景纹理 */
    .hero-bg {
      background: linear-gradient(135deg, #1A1D29 0%, #2A2F3F 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg::before {
      content: '';
      position: absolute;
      top: 0; right: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 80% 30%, rgba(232,69,30,0.15) 0%, transparent 50%);
    }

.section-padding { padding: 5rem 0; }
    @media (max-width: 768px) { .section-padding { padding: 3.5rem 0; } }
    .grid-advantage { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    @media (max-width: 1024px) { .grid-advantage { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 640px) { .grid-advantage { grid-template-columns: 1fr; } }
    .grid-service { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; }
    @media (max-width: 1024px) { .grid-service { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 640px) { .grid-service { grid-template-columns: 1fr; } }
    .grid-data { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
    @media (max-width: 768px) { .grid-data { grid-template-columns: repeat(2, 1fr); } }
    .grid-cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.8rem; }
    @media (max-width: 768px) { .grid-cases { grid-template-columns: 1fr; } }