/* roulang page: index */
:root {
      --deep-space: #0A0F24;
      --card-bg: #1A1F2E;
      --electric-blue: #00C2FF;
      --vibrant-orange: #FF6B35;
      --text-light: #B0B8C1;
      --text-muted: #889099;
      --white: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.2);
      --shadow-glow: 0 0 20px rgba(255, 107, 53, 0.4);
      --transition-smooth: all 0.3s ease;
      --container-max: 1200px;
      --section-padding: 100px 24px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
      background-color: var(--deep-space);
      color: var(--text-light);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 15, 36, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo span {
      background: linear-gradient(135deg, var(--electric-blue), var(--vibrant-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-blue);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-blue);
      transition: width 0.2s;
    }

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

    .nav-cta {
      background: var(--vibrant-orange);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      box-shadow: var(--shadow-glow);
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      background: #FF7F50;
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(255, 107, 53, 0.6);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--white);
      transition: var(--transition-smooth);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 15, 36, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        z-index: 99;
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta.desktop {
        display: none;
      }
    }

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

    h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 2rem;
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(90deg, #0A0F24 0%, rgba(10, 15, 36, 0.7) 70%, rgba(0, 194, 255, 0.1) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -1px;
      background: linear-gradient(to right, #fff, #00C2FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-content p {
      font-size: 1.25rem;
      color: var(--text-light);
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--vibrant-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      box-shadow: var(--shadow-glow);
      transition: var(--transition-smooth);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #FF7F50;
      transform: translateY(-3px);
      box-shadow: 0 0 35px rgba(255, 107, 53, 0.7);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--electric-blue);
      color: var(--electric-blue);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    .btn-ghost:hover {
      background: rgba(0, 194, 255, 0.1);
    }
    .hero-visual img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.5rem;
      }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .pain-card {
      background: var(--card-bg);
      border-left: 4px solid var(--vibrant-orange);
      padding: 28px;
      border-radius: var(--radius-md);
    }
    .pain-card h3 {
      color: white;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案玻璃卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr 1fr;
      gap: 24px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .glass-card img {
      width: 64px;
      height: 64px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 20px;
    }
    .glass-card h3 {
      color: white;
      margin-bottom: 12px;
    }
    @media (max-width: 1024px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据深色区 */
    #results {
      background: #060B1C;
    }
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin: 40px 0;
    }
    .stat-item h3 {
      font-size: 3rem;
      color: var(--vibrant-orange);
      font-weight: 800;
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    @media (max-width: 768px) {
      .case-cards {
        grid-template-columns: 1fr;
      }
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px;
      min-width: 300px;
      flex: 1;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      background: rgba(255,255,255,0.03);
      padding: 20px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: white;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: transparent;
      padding: 0 20px;
      color: var(--text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 20px 20px;
    }

    /* 表单 */
    .contact-form {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 40px;
      max-width: 600px;
      margin: 0 auto;
    }
    input, textarea {
      width: 100%;
      background: #1A1F2E;
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 8px;
      padding: 14px;
      color: white;
      margin-bottom: 16px;
    }
    input:focus, textarea:focus {
      border-color: var(--electric-blue);
      outline: none;
      box-shadow: 0 0 10px #00C2FF;
    }
    footer {
      background: #060B1C;
      border-top: 1px solid var(--electric-blue);
      padding: 60px 24px;
    }