/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --deep-blue: #0A0F1E;
      --dark-layer: #0D1322;
      --cyan: #00E5FF;
      --cyan-dark: #0091EA;
      --energy-orange: #FF6D00;
      --white: #FFFFFF;
      --gray: #B0B8C5;
      --border-light: rgba(255, 255, 255, 0.08);
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-hover: rgba(255, 255, 255, 0.08);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: all 0.3s ease;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 15, 30, 0.75);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }

    .navbar.scrolled {
      background: rgba(10, 15, 30, 0.92);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--cyan), #0091EA);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-icon {
      font-size: 28px;
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-link {
      color: var(--gray);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 8px var(--cyan);
      transition: width 0.3s;
    }

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

    .btn-nav-cta {
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      text-decoration: none;
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
      transition: var(--transition);
    }

    .btn-nav-cta:hover {
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.7);
      transform: translateY(-1px);
    }

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

    .hamburger span {
      width: 25px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: rgba(10, 15, 30, 0.98);
      backdrop-filter: blur(30px);
      padding: 80px 32px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.4s ease;
      z-index: 999;
      border-left: 1px solid rgba(255, 255, 255, 0.06);
    }

    .mobile-drawer.open {
      right: 0;
    }

    .mobile-drawer .nav-link {
      font-size: 18px;
      opacity: 0;
      transform: translateX(20px);
      animation: fadeSlideIn 0.3s forwards;
    }

    @keyframes fadeSlideIn {
      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0, 229, 255, 0.12), transparent 70%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, var(--cyan), white);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--gray);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      box-shadow: 0 0 18px rgba(0, 229, 255, 0.5);
      transition: var(--transition);
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.8);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-ghost:hover {
      background: white;
      color: var(--deep-blue);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--cyan);
      box-shadow: 0 0 10px var(--cyan);
      margin-top: 8px;
      border-radius: 2px;
    }

    /* 解决方案卡片错位 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

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

    .solution-card:nth-child(1) {
      margin-top: -20px;
    }

    .solution-card:nth-child(3) {
      margin-top: 20px;
    }

    .solution-card:hover {
      background: var(--glass-hover);
      transform: translateY(-6px);
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.3);
    }

    .card-icon {
      font-size: 42px;
      color: var(--cyan);
      margin-bottom: 20px;
    }

    .solution-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
      margin-top: 40px;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 800;
      font-family: var(--font-number);
      background: linear-gradient(135deg, var(--cyan), white);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      color: var(--gray);
      font-size: 15px;
      margin-top: 8px;
    }

    /* 证言轮播 */
    .testimonial-carousel {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 30px 0;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      flex: 0 0 350px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 28px;
      scroll-snap-align: center;
      transition: var(--transition);
      opacity: 0.6;
      transform: scale(0.9);
    }

    .testimonial-card.active {
      opacity: 1;
      transform: scale(1);
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.3);
    }

    .testimonial-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover;
      border: 2px solid var(--cyan);
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      margin-bottom: 8px;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--gray);
      line-height: 1.8;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A0F1E, #0D1A2F);
      text-align: center;
    }

    .btn-large {
      padding: 18px 48px;
      font-size: 18px;
    }

    /* 页脚 */
    .footer {
      background: #060B14;
      padding: 60px 0 30px;
      color: #6B7280;
    }

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

    .footer a {
      color: #9CA3AF;
      text-decoration: none;
    }

    .footer a:hover {
      color: var(--cyan);
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .cards-grid {
        grid-template-columns: 1fr;
      }
      .solution-card:nth-child(1),
      .solution-card:nth-child(3) {
        margin-top: 0;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 36px;
      }
    }