/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --deep: #0A0E27;
      --cardbg: #111640;
      --electric: #00F0FF;
      --energy: #FF3366;
      --gold: #FFD700;
      --lightbg: #F0F2FF;
      --bodytext: #B0B8D0;
      --darktext: #2D3348;
      --radius-card: 8px;
      --radius-btn: 4px;
      --shadow-glow: 0 4px 24px rgba(0,240,255,0.08);
      --shadow-hover: 0 8px 32px rgba(0,240,255,0.25);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep);
      color: #FFFFFF;
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,240,255,0.15);
      transition: background 0.3s;
    }
    .navbar.scrolled {
      background: rgba(10,14,39,0.98);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .logo-text span {
      background: linear-gradient(90deg, #00F0FF, #FFD700);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-weight: 500;
      color: #B0B8D0;
    }
    .nav-links a {
      transition: color 0.2s, text-shadow 0.2s;
    }
    .nav-links a:hover {
      color: #00F0FF;
      text-shadow: 0 0 8px rgba(0,240,255,0.5);
    }
    .btn-cta-nav {
      background: #FF3366;
      color: white;
      padding: 10px 20px;
      border-radius: 4px;
      font-weight: 600;
      transition: background 0.3s, box-shadow 0.3s;
      box-shadow: 0 0 16px rgba(255,51,102,0.3);
    }
    .btn-cta-nav:hover {
      background: #FF5C85;
      box-shadow: 0 0 24px rgba(255,51,102,0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: #00F0FF;
      transition: 0.3s;
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(10,14,39,0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      border-bottom: 1px solid rgba(0,240,255,0.2);
      z-index: 40;
    }
    .mobile-menu a {
      color: #B0B8D0;
      font-size: 1.1rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(0,240,255,0.2);
      padding-bottom: 8px;
    }
    /* Hero 区域 */
    .hero-section {
      padding-top: 120px;
      padding-bottom: 80px;
      background: linear-gradient(135deg, #0A0E27 0%, #1A1040 50%, #0A0E27 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-glow {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 50%, rgba(0,240,255,0.08) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(90deg, #00F0FF, #FFD700);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0B8D0;
      max-width: 600px;
      margin-bottom: 2rem;
    }
    .btn-primary {
      background: #00F0FF;
      color: #0A0E27;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: 4px;
      transition: 0.3s;
      display: inline-block;
      box-shadow: 0 0 18px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 28px rgba(0,240,255,0.6);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid #00F0FF;
      color: #00F0FF;
      padding: 12px 32px;
      border-radius: 4px;
      font-weight: 600;
      transition: 0.3s;
      display: inline-block;
      margin-left: 16px;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }
    /* 卡片通用 */
    .card-glow {
      background: #111640;
      border: 1px solid rgba(0,240,255,0.15);
      border-radius: 8px;
      box-shadow: 0 4px 24px rgba(0,240,255,0.08);
      transition: all 0.3s ease;
    }
    .card-glow:hover {
      border-color: rgba(0,240,255,0.4);
      box-shadow: 0 8px 32px rgba(0,240,255,0.25);
      transform: translateY(-4px);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      text-align: center;
      color: #FFFFFF;
    }
    .data-number {
      font-family: 'SF Mono', 'Consolas', monospace;
      font-size: 2.8rem;
      font-weight: 700;
      color: #FF3366;
    }
    /* FAQ 折叠 */
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.2);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: #0A0E27;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #2D3348;
      font-size: 1rem;
    }
    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 响应式断点 */
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 2.4rem; }
    }
    @media (max-width: 768px) {
      .hero-section { padding: 100px 20px 60px; }
      .hero-title { font-size: 2rem; }
      .btn-secondary { margin-left: 0; margin-top: 12px; }
    }