/* roulang page: index */
:root {
      --deep-indigo: #0F172A;
      --neon-cyan: #00F0FF;
      --accent-orange: #FF6B35;
      --soft-white: #F8FAFC;
      --card-white: #FFFFFF;
      --main-text: #1E293B;
      --sub-text: #64748B;
      --light-text: #F1F5F9;
      --border-light: #E2E8F0;
      --card-radius: 12px;
      --btn-radius: 8px;
      --tag-radius: 6px;
      --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 10px 25px rgba(15,23,42,0.12), 0 4px 10px rgba(0,240,255,0.15);
      --nav-shadow: 0 1px 3px rgba(0,0,0,0.2);
      --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      font-size: 16px;
      font-weight: 400;
      line-height: 1.6;
      color: var(--main-text);
      background-color: var(--soft-white);
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

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

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 16px;
      padding-right: 16px;
    }

    @media (min-width: 1024px) {
      .container {
        padding-left: 32px;
        padding-right: 32px;
      }
    }

    .section-spacing {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    @media (min-width: 768px) {
      .section-spacing {
        padding-top: 100px;
        padding-bottom: 100px;
      }
    }

    @media (min-width: 1024px) {
      .section-spacing {
        padding-top: 120px;
        padding-bottom: 120px;
      }
    }

    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-base);
      box-shadow: 0 2px 6px rgba(255,107,53,0.3);
      text-decoration: none;
    }

    .btn-primary:hover {
      background-color: #E55A2B;
      box-shadow: 0 4px 12px rgba(255,107,53,0.5);
      transform: translateY(-2px);
    }

    .btn-primary:active {
      background-color: #CC4A1E;
      transform: translateY(1px);
      box-shadow: 0 1px 4px rgba(255,107,53,0.4);
    }

    .btn-secondary {
      background-color: transparent;
      color: var(--neon-cyan);
      border: 2px solid var(--neon-cyan);
      font-weight: 600;
      font-size: 16px;
      padding: 12px 30px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition-base);
      text-decoration: none;
    }

    .btn-secondary:hover {
      background-color: rgba(0,240,255,0.08);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
      transform: translateY(-1px);
    }

    .card {
      background-color: var(--card-white);
      border-radius: var(--card-radius);
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      padding: 24px;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }

    @media (max-width: 639px) {
      .card:hover {
        transform: none;
        box-shadow: var(--card-shadow);
      }
    }

    .text-link {
      color: var(--neon-cyan);
      font-weight: 500;
      transition: var(--transition-base);
      cursor: pointer;
      text-decoration: none;
    }

    .text-link:hover {
      text-decoration: underline;
      color: #00D4E0;
    }

    .nav-scrolled {
      background-color: rgba(15, 23, 42, 0.95) !important;
      backdrop-filter: blur(12px);
      box-shadow: var(--nav-shadow);
    }

    .nav-scrolled .nav-text {
      color: white !important;
    }

    .nav-scrolled .nav-logo-text {
      color: white !important;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding-top: 0;
      border-top: 1px solid transparent;
      color: #475569;
      font-size: 16px;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 12px;
      border-top-color: var(--border-light);
    }

    .faq-icon {
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .pulse-dot {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.6; }
      100% { opacity: 1; }
    }

    input:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 0 3px rgba(0,240,255,0.2);
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 1023px) {
      .desktop-nav-links {
        display: none !important;
      }
      .mobile-menu {
        display: block;
      }
    }