/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --dark-footer: #060B1F;
      --competitive-orange: #FF6B35;
      --orange-glow: rgba(255, 107, 53, 0.6);
      --ice-white: #F0F4FF;
      --cool-gray: #8E9AAF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-border-hover: rgba(255, 255, 255, 0.2);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --border-radius-lg: 24px;
      --border-radius-md: 16px;
      --border-radius-sm: 12px;
      --font-sans: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--ice-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
      width: 100%;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 背景动态粒子（光点流动） */
    .particle-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      overflow: hidden;
      pointer-events: none;
    }

    .particle {
      position: absolute;
      background: rgba(255, 255, 255, 0.15);
      border-radius: 50%;
      filter: blur(2px);
      animation: float 14s infinite ease-in-out;
    }

    @keyframes float {
      0% { transform: translateY(0px) translateX(0px); opacity: 0.2; }
      50% { transform: translateY(-40px) translateX(20px); opacity: 0.5; }
      100% { transform: translateY(0px) translateX(0px); opacity: 0.2; }
    }

    /* 导航 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.7);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      z-index: 100;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 22px;
      font-weight: 800;
      color: white;
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-link {
      color: var(--cool-gray);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }

    .nav-link:hover,
    .nav-link.active {
      color: white;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--competitive-orange);
      box-shadow: 0 0 10px var(--orange-glow);
      border-radius: 2px;
    }

    .cta-login {
      background: var(--competitive-orange);
      color: white;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 40px;
      text-decoration: none;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
      font-size: 14px;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    .cta-login:hover {
      box-shadow: 0 0 24px var(--orange-glow);
      transform: translateY(-1px);
    }

    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(10, 14, 39, 0.9);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-radius: 40px;
      padding: 8px 8px;
      z-index: 110;
      border: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 10px 25px rgba(0,0,0,0.6);
      justify-content: space-around;
      align-items: center;
    }

    .mobile-nav a {
      color: var(--cool-gray);
      text-decoration: none;
      font-size: 12px;
      font-weight: 500;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      padding: 8px 6px;
      border-radius: 30px;
      transition: all var(--transition);
    }

    .mobile-nav a.active {
      color: white;
    }

    .mobile-cta {
      background: var(--competitive-orange);
      color: white !important;
      border-radius: 50%;
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 18px var(--orange-glow);
      font-weight: 700;
      font-size: 14px;
      margin-top: -16px;
    }

    @media (max-width: 768px) {
      .navbar {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .top-mobile-logo {
        display: block;
        position: fixed;
        top: 20px;
        left: 20px;
        z-index: 90;
        font-size: 20px;
        font-weight: 800;
        color: white;
        text-shadow: 0 0 15px rgba(0,0,0,0.5);
      }
    }

    @media (min-width: 769px) {
      .top-mobile-logo {
        display: none;
      }
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    /* 标题 */
    h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      letter-spacing: -1px;
    }

    h2 {
      font-size: 40px;
      font-weight: 800;
      margin-bottom: 16px;
      text-align: center;
    }

    h3 {
      font-size: 24px;
      font-weight: 700;
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 30px; }
      h3 { font-size: 22px; }
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow);
      padding: 32px;
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .stat-card {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      color: var(--competitive-orange);
      animation: pulse-glow 2s infinite;
    }

    @keyframes pulse-glow {
      0% { text-shadow: 0 0 5px rgba(255,107,53,0.3); }
      50% { text-shadow: 0 0 15px var(--orange-glow); }
      100% { text-shadow: 0 0 5px rgba(255,107,53,0.3); }
    }

    .stat-label {
      font-size: 13px;
      color: var(--cool-gray);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }

    .service-card {
      transition: all var(--transition);
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--glass-border-hover);
      box-shadow: 0 12px 30px rgba(0,0,0,0.5);
    }

    .service-icon {
      font-size: 48px;
      color: var(--competitive-orange);
      margin-bottom: 20px;
    }

    .comparison-wrapper {
      display: flex;
      gap: 30px;
      margin-top: 40px;
      align-items: stretch;
    }

    .compare-card {
      flex: 1;
      border-radius: var(--border-radius-lg);
      padding: 32px;
    }

    .compare-old {
      border: 1px solid rgba(255,80,80,0.3);
      background: rgba(255,80,80,0.05);
    }

    .compare-new {
      border: 1px solid var(--competitive-orange);
      box-shadow: 0 0 25px rgba(255,107,53,0.2);
      background: rgba(255,107,53,0.04);
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .faq-list {
      max-width: 800px;
      margin: 40px auto;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-md);
      margin-bottom: 16px;
      padding: 24px;
      cursor: pointer;
      transition: all var(--transition);
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      margin-top: 16px;
      color: var(--cool-gray);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active {
      border-color: var(--competitive-orange);
    }

    .contact-form {
      max-width: 560px;
      margin: 40px auto;
      padding: 48px;
    }

    .input-field {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--cool-gray);
      border-radius: 12px;
      padding: 14px 18px;
      color: white;
      margin-bottom: 20px;
      font-size: 16px;
      transition: 0.2s;
    }

    .input-field:focus {
      outline: none;
      border-color: var(--competitive-orange);
      box-shadow: 0 0 10px rgba(255,107,53,0.4);
    }

    .btn-primary {
      background: var(--competitive-orange);
      color: white;
      font-weight: 700;
      font-size: 18px;
      padding: 16px;
      border: none;
      border-radius: 40px;
      width: 100%;
      cursor: pointer;
      transition: all var(--transition);
      box-shadow: 0 0 15px rgba(255,107,53,0.5);
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px var(--orange-glow);
    }

    footer {
      background: var(--dark-footer);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      .contact-form { padding: 28px; }
    }