/* roulang page: index */
:root {
      --primary: #FF4D00;
      --primary-hover: #CC3E00;
      --accent-purple: #B300FF;
      --bg-dark: #1A1A1A;
      --bg-card: #242424;
      --border-color: #333333;
      --text-primary: #E5E5E5;
      --text-secondary: #CCCCCC;
      --font-heading: 'DIN Alternate', 'Impact', 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-glow: 0 0 20px rgba(255, 77, 0, 0.3);
      --spacing-section: 120px;
      --container-padding: 5%;
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-secondary);
      font-family: var(--font-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 var(--container-padding);
    }

    h1, h2, h3, .heading-font {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }

    h1 {
      font-size: 80px;
      font-weight: 900;
      letter-spacing: -1px;
      line-height: 1.1;
    }

    h2 {
      font-size: 56px;
      font-weight: 700;
      position: relative;
      padding-left: 24px;
      margin-bottom: 32px;
    }

    h2::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 40px;
      background-color: var(--primary);
      border-radius: 2px;
    }

    h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    p {
      font-size: 18px;
      color: var(--text-secondary);
      line-height: 1.8;
    }

    a {
      color: var(--text-primary);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--primary);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
      background: transparent;
      border-bottom: 1px solid transparent;
    }

    .navbar.scrolled {
      background: rgba(26, 26, 26, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 var(--container-padding);
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 900;
      color: var(--text-primary);
      letter-spacing: -1px;
      background: linear-gradient(135deg, #FFFFFF 0%, #E5E5E5 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 15px rgba(255,77,0,0.3);
    }

    .logo span {
      color: var(--primary);
      -webkit-text-fill-color: var(--primary);
    }

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

    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: var(--text-primary);
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 16px;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-glow);
      color: white;
    }

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

    .mobile-toggle span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(26, 26, 26, 0.98);
      backdrop-filter: blur(12px);
      border-top: 1px solid #333;
      z-index: 999;
      padding: 8px 0;
      justify-content: space-around;
      align-items: center;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: #aaa;
      gap: 4px;
    }

    .mobile-bottom-nav .nav-cta-mobile {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 50%, #2a2a2a 0%, #1A1A1A 70%);
    }

    .hero-bg-particles {
      position: absolute;
      right: 0;
      top: 0;
      width: 55%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mask-image: linear-gradient(to left, black 30%, transparent 95%);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent 95%);
    }

    .hero-content {
      display: flex;
      align-items: center;
      width: 100%;
      gap: 40px;
      position: relative;
      z-index: 2;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-text h1 {
      margin-bottom: 24px;
      color: var(--text-primary);
    }

    .hero-text h1 .highlight {
      color: var(--primary);
    }

    .hero-sub {
      font-size: 22px;
      margin-bottom: 40px;
      max-width: 500px;
      color: #ccc;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, box-shadow 0.3s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-glow);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--text-primary);
      color: var(--text-primary);
      padding: 16px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s;
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      min-height: 400px;
    }

    .particle-mock {
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, #FF4D00 5%, transparent 60%);
      filter: blur(40px);
      opacity: 0.4;
      border-radius: 50%;
    }

    /* 通用板块 */
    section {
      padding: var(--spacing-section) 0;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .pain-text h2, .solution-text h2 {
      margin-bottom: 24px;
    }

    .pain-image img, .solution-image img {
      border-radius: var(--radius-md);
      border: 1px solid #333;
    }

    /* 解决方案交互列表 */
    .interactive-list {
      display: flex;
      flex-direction: column;
      gap: 32px;
      margin-top: 40px;
    }

    .list-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      padding: 16px 0;
      border-bottom: 1px solid #2A2A2A;
      transition: all 0.2s;
    }

    .list-number {
      font-size: 48px;
      font-weight: 900;
      color: rgba(179, 0, 255, 0.3);
      line-height: 1;
      min-width: 70px;
      transition: color 0.3s;
    }

    .list-item:hover .list-number {
      color: var(--primary);
    }

    .list-content h3 {
      margin-top: 0;
    }

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

    .stat-item .stat-number {
      font-size: 64px;
      font-weight: 900;
      color: var(--primary);
      font-style: italic;
    }

    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }

    .testimonial-card {
      min-width: 300px;
      background: #242424;
      border: 1px solid #333;
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s;
    }

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

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #333;
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      align-items: center;
      font-weight: 600;
      font-size: 20px;
      color: var(--text-primary);
    }

    .faq-toggle {
      color: var(--primary);
      margin-right: 16px;
      font-size: 24px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding-left: 44px;
      color: #ccc;
    }

    /* CTA 全屏 */
    .cta-full {
      background: #0D0D0D;
      text-align: center;
      padding: 100px 0;
    }

    .footer {
      background: #0D0D0D;
      padding: 40px 0;
      text-align: center;
      border-top: 1px solid #222;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 56px; }
      h2 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      :root {
        --spacing-section: 80px;
      }
      .nav-links, .nav-cta {
        display: none;
      }
      .mobile-toggle {
        display: flex;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      h1 { font-size: 42px; }
      h2 { font-size: 32px; padding-left: 0; }
      h2::before { display: none; }
      .grid-2 {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-content {
        flex-direction: column;
      }
      .hero-visual {
        min-height: 250px;
      }
    }