/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    
    :root {
      --primary-black: #0B0C10;
      --accent-orange: #FF4D00;
      --titanium-gray: #E5E7EB;
      --cool-white: #F9FAFB;
      --title-dark: #111827;
      --body-text: #4B5563;
      --muted-text: #9CA3AF;
      --card-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition-smooth: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      background-color: var(--cool-white);
      color: var(--body-text);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      color: var(--title-dark);
      font-weight: 600;
    }

    .section-padding {
      padding: 120px 0;
    }

    @media (max-width: 768px) {
      .section-padding {
        padding: 80px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* 自定义字体用于数字 */
    .font-mono-data {
      font-family: "DIN Alternate", "SF Mono", "Menlo", monospace;
    }

    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--titanium-gray);
      z-index: 50;
      transition: box-shadow 0.3s ease;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-black);
      letter-spacing: 0.05em;
      text-decoration: none;
    }
    .logo-svg {
      width: 32px;
      height: 32px;
      fill: none;
      stroke: var(--accent-orange);
      stroke-width: 2.5;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--body-text);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-orange);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .search-box {
      background: #F3F4F6;
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--muted-text);
      font-size: 14px;
      margin-right: 16px;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      text-decoration: none;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #CC3D00;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--title-dark);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .mobile-menu.active {
        display: flex;
      }
    }

    /* Hero 粒子动画 */
    .hero-particles {
      position: relative;
      width: 100%;
      height: 100%;
      min-height: 500px;
    }
    .particle {
      position: absolute;
      background: var(--accent-orange);
      border-radius: 50%;
      opacity: 0.2;
      animation: float 6s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.1; }
      50% { transform: translateY(-30px) scale(1.2); opacity: 0.3; }
      100% { transform: translateY(0px) scale(1); opacity: 0.1; }
    }
    .fade-in-up {
      animation: fadeInUp 0.8s ease forwards;
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 卡片通用 */
    .card {
      background: white;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      transition: all var(--transition-smooth);
      padding: 32px;
    }
    .card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    /* 进度条动画 */
    .progress-bar {
      height: 6px;
      background: var(--titanium-gray);
      border-radius: 3px;
      overflow: hidden;
      margin-top: 12px;
    }
    .progress-fill {
      height: 100%;
      background: var(--accent-orange);
      width: 0%;
      transition: width 1s ease;
    }