/* roulang page: index */
:root {
      --primary: #00F0A8;
      --primary-glow: rgba(0, 240, 168, 0.5);
      --accent: #A855F7;
      --bg-deep: #0B0C10;
      --bg-card: #1A1D24;
      --glass-bg: rgba(15, 17, 23, 0.85);
      --glass-border: rgba(0, 240, 168, 0.15);
      --text-main: #FFFFFF;
      --text-h2: #F0F0F0;
      --text-h3: #E0E0E0;
      --text-body: #B0B3C0;
      --text-muted: #888C9A;
      --radius-card: 20px;
      --radius-btn: 999px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 自定义容器 */
    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 dock */
    .nav-dock {
      background: var(--glass-bg);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-radius: 40px;
      border-bottom: 1px solid transparent;
      background-clip: padding-box;
      position: relative;
      box-shadow: 0 8px 32px rgba(0,0,0,0.6);
      max-width: 1100px;
      margin: 24px auto 0;
      padding: 0 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      z-index: 50;
    }
    .nav-dock::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 20px;
      right: 20px;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
      opacity: 0.8;
    }

    .logo-text {
      font-weight: 800;
      font-size: 1.35rem;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .logo-diamond {
      width: 18px;
      height: 18px;
      background: var(--primary);
      transform: rotate(45deg);
      border-radius: 3px;
      box-shadow: 0 0 12px var(--primary-glow);
      display: inline-block;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
    }
    .nav-links a {
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
      box-shadow: 0 0 10px var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: #0B0C10;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      border: none;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(0,240,168,0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: #33F5BC;
      box-shadow: 0 0 28px var(--primary-glow);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: rgba(0,240,168,0.08);
      border-color: #33F5BC;
      color: #33F5BC;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: rgba(26,29,36,0.6);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s ease;
      box-shadow: 0 4px 24px rgba(0,0,0,0.4);
    }
    .glass-card:hover {
      border-color: var(--primary);
      box-shadow: 0 0 24px rgba(0,240,168,0.25);
      transform: translateY(-6px);
    }

    /* 霓虹文字 */
    .text-neon {
      color: var(--primary);
    }
    .h1-main {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      color: #FFFFFF;
    }
    .h2-section {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-h2);
    }
    .h3-card {
      font-size: 24px;
      font-weight: 600;
      color: var(--text-h3);
    }
    .mono-data {
      font-family: var(--font-mono);
    }

    /* 打字机效果 */
    .typewriter {
      border-right: 2px solid var(--primary);
      white-space: nowrap;
      overflow: hidden;
      animation: blink 0.8s infinite;
      display: inline-block;
      vertical-align: bottom;
    }
    @keyframes blink {
      0%, 100% { border-color: transparent; }
      50% { border-color: var(--primary); }
    }

    /* 背景光斑 */
    .bg-glow-circle {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.25;
      z-index: 0;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,240,168,0.1);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: #E0E0E0;
    }
    .faq-icon {
      font-size: 24px;
      color: var(--primary);
      transition: transform 0.2s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 90px;
      left: 16px;
      right: 16px;
      background: rgba(15,17,23,0.95);
      backdrop-filter: blur(30px);
      border-radius: 28px;
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      z-index: 100;
      border: 1px solid var(--glass-border);
      box-shadow: 0 20px 40px rgba(0,0,0,0.8);
    }
    .mobile-menu a {
      color: #E0E0E0;
      font-size: 1.2rem;
      font-weight: 500;
    }
    #menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }

    @media (max-width: 768px) {
      .container-main {
        padding-left: 16px;
        padding-right: 16px;
      }
      .nav-dock {
        margin: 12px 12px;
        padding: 0 20px;
      }
      .nav-links {
        display: none;
      }
      #menu-toggle {
        display: block;
      }
      .h1-main {
        font-size: 36px;
      }
      .h2-section {
        font-size: 28px;
      }
      .h3-card {
        font-size: 20px;
      }
      .mobile-menu.active {
        display: flex;
      }
    }

    @media (max-width: 520px) {
      .h1-main {
        font-size: 30px;
      }
    }