/* roulang page: index */
:root {
      --primary: #0A0E1A;
      --accent: #00F0FF;
      --emphasis: #FF003C;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-title: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7B8D;
      --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.3);
      --gradient-btn: linear-gradient(135deg, #00F0FF 0%, #0088CC 100%);
      --gradient-cta: linear-gradient(135deg, #FF003C 0%, #CC002F 100%);
      --radius-card: 16px;
      --radius-btn: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
      --card-padding: 32px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

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

    /* 导航栏 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(10, 14, 26, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.12);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF 0%, #88E0FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }

    .logo::before {
      content: "";
      display: inline-block;
      width: 12px;
      height: 12px;
      background: #00F0FF;
      transform: rotate(45deg);
      box-shadow: 0 0 12px #00F0FF;
      margin-right: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition-smooth);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #00F0FF;
      border-bottom-color: #00F0FF;
    }

    .btn-nav-cta {
      background: var(--gradient-btn);
      color: #0A0E1A;
      font-weight: 700;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-size: 15px;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
    }

    .btn-nav-cta:hover {
      box-shadow: 0 0 35px rgba(0, 240, 255, 0.7);
      transform: scale(1.05);
    }

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

    .hamburger span {
      width: 24px;
      height: 2px;
      background: #00F0FF;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 26, 0.96);
        backdrop-filter: blur(24px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        border-bottom: 1px solid rgba(0,240,255,0.2);
      }
      .nav-links.mobile-active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .btn-nav-cta {
        align-self: flex-start;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 60%);
    }

    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
      width: 100%;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-title {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -0.02em;
      background: linear-gradient(to right, #00F0FF, #88E0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 30px rgba(0,240,255,0.3);
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      max-width: 600px;
      margin-bottom: 32px;
    }

    .hero-visual {
      flex: 1 1 400px;
      background: rgba(10,14,26,0.7);
      backdrop-filter: blur(24px);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(0,240,255,0.15);
    }

    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: #00F0FF;
      font-size: 28px;
      animation: pulseDown 2s infinite;
    }

    @keyframes pulseDown {
      0% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    }

    @media (max-width: 768px) {
      .hero-title { font-size: 36px; }
      .hero-sub { font-size: 16px; }
    }

    /* 板块通用 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 42px;
      font-weight: 700;
      text-align: center;
      color: var(--text-title);
      margin-bottom: 16px;
      position: relative;
    }

    .section-title::after {
      content: "";
      display: block;
      width: 60px;
      height: 4px;
      background: #00F0FF;
      margin: 12px auto 40px;
      border-radius: 2px;
    }

    .glass-card {
      background: rgba(10, 14, 26, 0.7);
      backdrop-filter: blur(24px);
      border: 1px solid rgba(0, 240, 255, 0.12);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: 0 0 40px rgba(0, 240, 255, 0.2);
      transform: translateY(-4px);
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 20px;
    }

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

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: #00F0FF;
      text-shadow: 0 0 12px rgba(0,240,255,0.5);
      margin: 12px 0;
      font-feature-settings: "tnum";
    }

    .stat-label {
      color: var(--text-body);
      font-weight: 500;
    }

    .trend-up { color: #00E676; }
    .trend-down { color: #FF003C; }

    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 20px;
    }

    .service-icon {
      font-size: 32px;
      color: #00F0FF;
      margin-bottom: 16px;
    }

    .service-title {
      font-size: 22px;
      font-weight: 600;
      color: white;
      margin-bottom: 8px;
    }

    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .service-link {
      color: #00F0FF;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: 0.2s;
    }

    .service-link:hover { gap: 8px; }

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

    /* 对比 */
    .comparison-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-top: 30px;
    }

    .vs-badge {
      font-size: 28px;
      font-weight: 800;
      color: #00F0FF;
      background: rgba(0,240,255,0.1);
      width: 70px;
      height: 70px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid #00F0FF;
      box-shadow: 0 0 30px rgba(0,240,255,0.4);
    }

    .compare-col {
      flex: 1;
    }

    .compare-list {
      list-style: none;
      margin-top: 20px;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }

    .icon-fail { color: #FF003C; }
    .icon-success { color: #00F0FF; }

    @media (max-width: 768px) {
      .comparison-row {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-item {
      margin-bottom: 12px;
    }

    .faq-question {
      background: rgba(10,14,26,0.8);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(0,240,255,0.15);
      border-radius: 12px;
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,240,255,0.02);
      border-radius: 0 0 12px 12px;
      padding: 0 24px;
      color: var(--text-body);
      font-size: 15px;
      border-left: 2px solid #00F0FF;
      margin-left: 8px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }

    .faq-toggle {
      font-size: 22px;
      transition: 0.3s;
    }

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

    /* CTA */
    .cta-section {
      background: #060912;
      background-image: linear-gradient(rgba(0,240,255,0.02) 1px, transparent 1px);
      background-size: 30px 30px;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 40px;
      justify-content: center;
    }

    .cta-form input,
    .cta-form select {
      background: transparent;
      border: none;
      border-bottom: 1px solid #00F0FF;
      padding: 12px 16px;
      color: white;
      font-size: 16px;
      outline: none;
      min-width: 200px;
      transition: 0.2s;
    }

    .cta-form input:focus,
    .cta-form select:focus {
      border-bottom-width: 2px;
      box-shadow: 0 4px 12px rgba(0,240,255,0.2);
    }

    .btn-submit {
      background: var(--gradient-cta);
      border: none;
      color: white;
      font-weight: 700;
      padding: 14px 40px;
      border-radius: 50px;
      box-shadow: 0 0 30px rgba(255,0,60,0.5);
      cursor: pointer;
      transition: 0.3s;
    }

    .btn-submit:hover {
      box-shadow: 0 0 50px rgba(255,0,60,0.8);
      transform: scale(1.05);
    }

    /* 页脚 */
    .footer {
      background: #0A0E1A;
      border-top: 1px solid rgba(0,240,255,0.15);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 8px;
      font-size: 14px;
    }

    .footer-bottom {
      margin-top: 40px;
      text-align: center;
      color: var(--text-muted);
      font-size: 13px;
    }

    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 80px 0; }
      .section-title { font-size: 28px; }
    }