/* roulang page: index */
:root {
      --primary: #E94E1F;
      --primary-dark: #C83D18;
      --secondary: #1A1A2E;
      --accent: #00C9A7;
      --gray-bg: #F9FAFB;
      --gray-text: #4B5563;
      --gray-light: #6B7280;
      --border-light: #E5E7EB;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.06);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--gray-bg);
      color: #1A1A2E;
      margin: 0;
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      transition: background-color 0.2s;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 速度线装饰 */
    .speed-line {
      position: absolute;
      width: 120px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary) 0%, rgba(233,78,31,0) 100%);
      border-radius: 2px;
      transform: rotate(-2deg);
      opacity: 0.7;
    }
    
    /* 导航栏 */
    #navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: background 0.25s, box-shadow 0.25s;
      border-bottom: 1px solid transparent;
    }
    #navbar.scrolled {
      background: #ffffff;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid #E5E7EB;
    }
    
    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: baseline;
      gap: 2px;
    }
    .nav-logo span {
      color: var(--primary);
      font-weight: 700;
    }
    .nav-logo small {
      font-size: 0.8rem;
      font-weight: 400;
      color: #6B7280;
      margin-left: 2px;
      letter-spacing: 0.2px;
    }
    
    .nav-link {
      font-weight: 500;
      color: #374151;
      transition: color 0.2s;
      position: relative;
      text-decoration: none;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 65%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.2s ease;
      border-radius: 2px;
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      transition: all 0.2s;
      box-shadow: 0 2px 6px rgba(233,78,31,0.3);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      box-shadow: 0 6px 14px rgba(201,61,24,0.4);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(233,78,31,0.08);
      border-color: var(--primary-dark);
    }
    
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      transition: 0.2s;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--secondary);
    }
    
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 64px;
      height: 4px;
      background: var(--primary);
      margin-top: 0.75rem;
      border-radius: 2px;
    }
    .section-title.text-center::after {
      margin-left: auto;
      margin-right: auto;
    }
    
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--border-light);
      transform: translateY(-4px);
      position: relative;
    }
    .card-hover-accent:hover::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 3px;
      background: var(--primary);
      border-radius: 12px 0 0 12px;
    }
    
    /* 英雄区域斜切装饰 */
    .hero-visual {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      bottom: 0;
      right: 0;
      width: 100px;
      height: 100px;
      background: var(--primary);
      opacity: 0.2;
      clip-path: polygon(100% 0, 0% 100%, 100% 100%);
    }
    
    /* FAQ 动画 */
    .faq-item {
      border-bottom: 1px solid #E5E7EB;
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s;
      background: #F3F4F6;
      border-radius: 8px;
      margin-top: 0.25rem;
      padding-left: 0;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 1rem 1.5rem 0.5rem;
      border-left: 3px solid var(--primary);
      background: #F3F4F6;
      margin-top: 0.75rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* 瀑布流动画占位 */
    .masonry-grid {
      column-count: 2;
      column-gap: 1.5rem;
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    
    /* 移动菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      z-index: 100;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }

:root {
            --primary: #E94E1F;
            --primary-dark: #C83D18;
            --secondary: #1A1A2E;
            --accent: #00C9A7;
            --bg-light: #F9FAFB;
            --gray-100: #F3F4F6;
            --gray-200: #E5E7EB;
            --gray-300: #D1D5DB;
            --gray-500: #6B7280;
            --gray-700: #374151;
            --gray-900: #111827;
            --card-bg: #FFFFFF;                        
            --text-dark: #1A1A2E;
            --text-body: #4B5563;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-tag: 6px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
            --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.06);
         }

        * { box-sizing: border-box; }
        body {
            margin:0;
            padding:0;
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, sans-serif;
            background-color: #F9FAFB;
            color: #4B5563  ;
            line-height: 1.7;
            font-weight: 400;
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