/* roulang page: index */
:root {
      --cyber-black: #0B0A1A;
      --cyber-deep: #0D0B1E;
      --neon-cyan: #00F0FF;
      --neon-purple: #B300FF;
      --electric-purple: #8A2BE2;
      --cool-gray: #F5F6FA;
      --text-dark: #4A4A6A;
      --text-light: #B0B0CC;
      --border-radius-card: 8px;
      --border-radius-sharp: 2px;
      --border-radius-faq: 6px;
      --shadow-light: 0 4px 24px rgba(11,10,26,0.06);
      --shadow-neon: 0 0 20px rgba(0,240,255,0.1);
      --transition-smooth: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      margin: 0;
      line-height: 1.8;
      color: var(--text-dark);
      background-color: #fff;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    a, button, input {
      transition: var(--transition-smooth);
    }

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

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 50;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: box-shadow var(--transition-smooth);
    }
    .navbar.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--cyber-black);
      letter-spacing: -0.5px;
      text-decoration: none;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.4);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-dark);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      transition: width var(--transition-smooth);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-links a:hover {
      color: var(--cyber-black);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--neon-cyan);
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1A1545, var(--cyber-black) 80%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.3;
      color: white;
      text-shadow: 0 0 20px rgba(0,240,255,0.3);
      margin-bottom: 1.5rem;
    }
    .hero-text h1 .cyan {
      color: var(--neon-cyan);
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-light);
      margin-bottom: 2.5rem;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--neon-cyan);
      color: var(--cyber-black);
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: 8px;
      text-decoration: none;
      display: inline-block;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
      transition: 0.3s ease;
    }
    .btn-primary:hover {
      background: var(--electric-purple);
      box-shadow: 0 0 30px rgba(138,43,226,0.7);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 700;
      padding: 0.8rem 2.2rem;
      border-radius: 8px;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--neon-cyan);
      color: var(--cyber-black);
    }
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-visual img {
      border-radius: 16px;
      box-shadow: 0 0 40px rgba(0,240,255,0.25);
    }

    /* 区块标题 */
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .dark-title {
      color: white;
    }
    .light-title {
      color: var(--cyber-black);
    }

    /* 品牌价值 */
    .brand-values {
      background: var(--cyber-deep);
      padding: 5rem 0;
    }
    .values-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 3rem;
    }
    .value-stat h3 {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--neon-cyan);
      line-height: 1.2;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .service-card {
      background: var(--cool-gray);
      padding: 2rem 1.5rem;
      border-radius: var(--border-radius-card);
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .service-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: var(--shadow-neon);
      transform: translateY(-4px);
    }

    /* 赛事案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .case-card {
      background: white;
      border-radius: var(--border-radius-sharp);
      border: 1px solid rgba(179,0,255,0.3);
      overflow: hidden;
      transition: 0.25s;
    }
    .case-card:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.2);
    }

    /* 合作伙伴 */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 2rem;
      align-items: center;
    }
    .partner-logo {
      filter: grayscale(100%);
      opacity: 0.7;
      transition: 0.3s;
      text-align: center;
    }
    .partner-logo:hover {
      filter: grayscale(0%);
      opacity: 1;
      transform: scale(1.05);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e2e8f0;
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-dark);
    }

    /* 表单 */
    .contact-input {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      padding: 0.8rem 0;
      color: white;
      width: 100%;
      outline: none;
    }
    .contact-input:focus {
      border-bottom-color: var(--neon-cyan);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: 1fr 1fr; }
      .values-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-text h1 { font-size: 2.2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .partner-grid { grid-template-columns: repeat(3,1fr); }
      .footer-grid { grid-template-columns: 1fr; }
    }