/* roulang page: index */
/* ----- 设计变量 & 全局重置 ----- */
    :root {
      --deep-bg: #0f0a1a;
      --dark-card: rgba(255, 255, 255, 0.04);
      --purple-dark: #1a0a2e;
      --purple-mid: #2d1b4e;
      --electric-purple: #a855f7;
      --electric-purple2: #7c3aed;
      --gold: #f0b90b;
      --gold-soft: rgba(240, 185, 11, 0.15);
      --text-light: #e0d6f0;
      --text-muted: #b0a0c0;
      --white: #ffffff;
      --light-bg: #f8f9fc;
      --border-soft: rgba(168, 85, 247, 0.15);
      --border-glow: rgba(168, 85, 247, 0.5);
      --card-hover-shadow: 0 8px 40px rgba(168, 85, 247, 0.25);
      --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
      --radius-card: 20px;
      --radius-btn: 40px;
      --radius-badge: 8px;
      --max-width: 1280px;
      --header-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--deep-bg);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, .orbitron {
      font-family: 'Orbitron', sans-serif;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: 0.2s;
    }
    
    img {
      max-width: 100%;
      display: block;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    /* ----- 导航 (沉浸式顶部 + 移动端底部胶囊) ----- */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(15, 10, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(168, 85, 247, 0.2);
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-family: 'Orbitron', sans-serif;
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--electric-purple);
      font-size: 2rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-light);
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--gold);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--gold);
    }
    
    .nav-cta {
      background: linear-gradient(135deg, var(--electric-purple), var(--electric-purple2));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: 0.3s;
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.6);
      transform: translateY(-1px);
    }
    
    /* 移动端底部导航 (默认隐藏) */
    .mobile-bottom-nav {
      display: none;
    }
    
    /* ----- 板块通用 ----- */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 40px;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
    }
    
    /* ----- Hero 首屏 ----- */
    #hero {
      padding-top: calc(var(--header-height) + 40px);
      padding-bottom: 60px;
      background: radial-gradient(circle at 30% 40%, #2d1b4e 0%, #0f0a1a 70%);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-height: 450px;
      border-radius: 32px;
      box-shadow: 0 0 60px rgba(168, 85, 247, 0.4);
      filter: drop-shadow(0 0 30px #a855f7);
      object-fit: contain;
    }
    .hero-title {
      font-size: 56px;
      font-weight: 700;
      background: linear-gradient(to right, #c084fc, #a855f7, #f0b90b);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-purple), var(--electric-purple2));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.3s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--gold);
      color: var(--gold);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: var(--gold-soft);
    }
    
    /* ----- 核心优势网格 ----- */
    #advantages {
      background-color: var(--deep-bg);
    }
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--dark-card);
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      transition: 0.3s;
      backdrop-filter: blur(10px);
    }
    .adv-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 2.8rem;
      color: var(--electric-purple);
      margin-bottom: 16px;
    }
    .data-badge {
      font-size: 32px;
      font-weight: 700;
      color: var(--gold);
      margin-bottom: 8px;
    }
    .adv-card h3 {
      font-size: 1.4rem;
      margin-bottom: 8px;
    }
    
    /* ----- 赛事数据仪表板 ----- */
    #stats {
      background: linear-gradient(135deg, #1a0a2e, #2d1b4e);
      color: white;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .stat-item {
      font-family: 'Orbitron', sans-serif;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--gold);
      display: block;
    }
    .stat-label {
      font-size: 1.1rem;
      color: #ccc;
    }
    
    /* ----- 服务方案卡片 ----- */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .solution-card {
      background: var(--dark-card);
      border-radius: var(--radius-card);
      padding: 40px 24px;
      border: 1px solid var(--border-soft);
      transition: 0.3s;
      position: relative;
    }
    .solution-card.recommended {
      border-color: var(--gold);
      background: rgba(240, 185, 11, 0.05);
    }
    .badge-hot {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--gold);
      color: #000;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
    }
    .solution-card h3 {
      font-size: 1.8rem;
      margin-bottom: 12px;
    }
    .solution-list {
      list-style: none;
      margin: 20px 0;
    }
    .solution-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    /* ----- 案例瀑布流 ----- */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--dark-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-soft);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    
    /* ----- FAQ 手风琴 ----- */
    #faq {
      background-color: var(--light-bg);
      color: #1a1a2e;
    }
    .faq-item {
      border-bottom: 1px solid #e5e7eb;
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: #444;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    
    /* ----- 联系表单 ----- */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .input-field {
      width: 100%;
      padding: 14px;
      background: #f1f3f5;
      border: none;
      border-radius: 12px;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .input-field:focus {
      outline: 2px solid var(--electric-purple);
    }
    
    /* ----- 页脚 ----- */
    footer {
      background: #1a0a2e;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    /* ----- 响应式设计 ----- */
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .solutions-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 36px; }
      .hero-grid { flex-direction: column; }
      .advantages-grid, .cases-grid, .footer-grid { grid-template-columns: 1fr; }
      .stats-grid { gap: 30px; }
      .contact-grid { grid-template-columns: 1fr; }
      
      /* 移动端导航切换 */
      .desktop-nav { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 12px;
        left: 10px;
        right: 10px;
        background: rgba(15, 10, 26, 0.95);
        backdrop-filter: blur(20px);
        border-radius: 24px;
        padding: 12px 20px;
        justify-content: space-around;
        z-index: 999;
      }
      .mobile-bottom-nav a {
        color: #ccc;
        font-size: 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .mobile-bottom-nav a i { font-size: 1.4rem; }
      .mobile-bottom-nav a.active { color: var(--gold); }
      
      header { height: 60px; }
      .logo { font-size: 1.4rem; }
    }