/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-deep: #0B0C10;
      --bg-card: rgba(20, 25, 35, 0.7);
      --glass-border: rgba(255, 255, 255, 0.08);
      --energy: #F04E30;
      --energy-glow: rgba(240, 78, 48, 0.4);
      --platinum: #B0B8C5;
      --platinum-dim: #9CA3AF;
      --white: #ffffff;
      --dark-footer: #05060A;
      --accent-purple: #8B5CF6;
      --accent-green: #10B981;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --container-max: 1280px;
      --section-gap: 100px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--platinum);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      background-image: radial-gradient(circle at 25% 30%, rgba(240, 78, 48, 0.03) 0%, transparent 45%);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #1A1D24;
    }
    ::-webkit-scrollbar-thumb {
      background: #3A3F4A;
      border-radius: 3px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #F04E30;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(240, 78, 48, 0.25);
      z-index: 100;
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: white;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, #F04E30, #E85D04);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--platinum);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--energy);
      transition: width 0.25s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--energy);
    }
    .nav-links a.active::after,
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--energy);
      color: white;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      letter-spacing: 0.5px;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(240, 78, 48, 0.3);
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 22px var(--energy-glow);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--platinum);
      color: var(--platinum);
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      border-color: var(--energy);
      color: var(--energy);
      background: rgba(240, 78, 48, 0.08);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--platinum);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      height: calc(100vh - 70px);
      background: rgba(11, 12, 16, 0.96);
      backdrop-filter: blur(24px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: white;
      text-decoration: none;
    }
    /* 区块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--platinum);
      margin-bottom: 48px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 40px;
      background: var(--energy);
      border-radius: 2px;
    }
    /* 英雄区 */
    .hero {
      padding: 160px 0 120px;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(240,78,48,0.15) 0%, rgba(11,12,16,0.8) 80%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.15;
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
      margin-bottom: 24px;
    }
    .hero .highlight {
      color: var(--energy);
    }
    .hero p {
      font-size: 1.3rem;
      color: #D1D5DB;
      margin-bottom: 40px;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    /* 网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .card:hover {
      transform: translateY(-6px);
      border-color: rgba(240, 78, 48, 0.45);
      box-shadow: 0 18px 35px -10px rgba(240, 78, 48, 0.2);
    }
    .icon-placeholder {
      font-size: 2.2rem;
      margin-bottom: 20px;
      color: var(--platinum);
      transition: 0.2s;
    }
    .card:hover .icon-placeholder {
      color: var(--energy);
      text-shadow: 0 0 12px var(--energy-glow);
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--energy);
    }
    .process-step {
      display: flex;
      align-items: flex-start;
      gap: 24px;
    }
    .step-circle {
      width: 44px;
      height: 44px;
      background: var(--energy);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: white;
      flex-shrink: 0;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .footer {
      background: var(--dark-footer);
      padding: 70px 0 30px;
      color: #9CA3AF;
    }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.6rem; }
      .section-title { font-size: 1.9rem; }
      .grid-3, .grid-4, .service-grid, .case-grid { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
    }
    .mobile-menu.active { display: flex; }