/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --panel-bg: #111633;
      --electric-cyan: #00F0FF;
      --electric-cyan-dark: #00B8D4;
      --shock-pink: #FF3366;
      --white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7A99;
      --glass-bg: rgba(17, 22, 51, 0.7);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-border-hover: rgba(0, 240, 255, 0.4);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-tag: 10px;
      --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.08);
      --shadow-card-hover: 0 16px 48px rgba(0, 240, 255, 0.2);
      --shadow-btn-cyan: 0 0 24px rgba(0, 240, 255, 0.6);
      --shadow-btn-pink: 0 0 28px rgba(255, 51, 102, 0.7);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--deep-space);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, background 0.2s;
    }

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.18);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: -0.5px;
    }

    .logo svg {
      width: 32px;
      height: 32px;
      fill: var(--electric-cyan);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
      font-weight: 500;
      color: var(--text-body);
    }

    .nav-menu a {
      position: relative;
      padding: 4px 0;
      color: var(--text-body);
      transition: color 0.2s;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--electric-cyan);
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .btn-capsule {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.3s;
      cursor: pointer;
      border: none;
      background: linear-gradient(135deg, var(--electric-cyan), var(--electric-cyan-dark));
      color: var(--deep-space);
      box-shadow: 0 4px 14px rgba(0, 240, 255, 0.3);
    }

    .btn-capsule:hover {
      box-shadow: var(--shadow-btn-cyan);
      transform: scale(1.04);
    }

    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--electric-cyan);
      color: var(--electric-cyan);
      box-shadow: none;
    }

    .btn-outline-cyan:hover {
      background: rgba(0, 240, 255, 0.08);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
      transform: scale(1.04);
    }

    .btn-pink {
      background: var(--shock-pink);
      color: white;
      box-shadow: 0 4px 18px rgba(255, 51, 102, 0.4);
    }

    .btn-pink:hover {
      box-shadow: var(--shadow-btn-pink);
      transform: scale(1.04);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }

    /* 移动端导航全屏 */
    .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(24px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 100;
    }

    .mobile-nav.open {
      transform: translateX(0);
    }

    .mobile-nav a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--white);
      border-left: 4px solid var(--electric-cyan);
      padding-left: 20px;
    }

    .close-mobile {
      position: absolute;
      top: 24px;
      right: 24px;
      background: transparent;
      border: none;
      color: var(--white);
      font-size: 2rem;
      cursor: pointer;
    }

    @media (max-width: 767px) {
      .nav-menu, .nav-cta-desktop {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }

    .section-spacing {
      margin-top: 100px;
      margin-bottom: 100px;
    }

    @media (max-width: 767px) {
      .section-spacing {
        margin-top: 70px;
        margin-bottom: 70px;
      }
    }

    .text-cyan {
      color: var(--electric-cyan);
    }

    .text-pink {
      color: var(--shock-pink);
    }

    .bg-panel {
      background-color: var(--panel-bg);
    }