/* roulang page: index */
:root {
      --deep-blue: #0B0C1E;
      --electric-blue: #3B82F6;
      --purple: #8B5CF6;
      --neon-cyan: #00F0FF;
      --violet: #A855F7;
      --white: #F8FAFC;
      --gray: #94A3B8;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --neon-glow: 0 0 20px rgba(0, 240, 255, 0.6);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --transition: all 0.3s ease;
      --font-primary: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
      --nav-height: 64px;
    }

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

    body {
      font-family: var(--font-primary);
      background-color: var(--deep-blue);
      color: var(--white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      background-image: radial-gradient(circle at 30% 10%, rgba(59, 130, 246, 0.08) 0%, transparent 45%);
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--electric-blue) 0%, var(--neon-cyan) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h2 {
      font-size: clamp(2rem, 5vw, 3rem);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: clamp(1.5rem, 4vw, 2rem);
      font-weight: 600;
    }

    p {
      color: var(--gray);
      font-size: 1.125rem;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-primary);
      border: none;
      background: none;
      font-weight: 600;
      transition: var(--transition);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(11, 12, 30, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

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

    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      background: linear-gradient(to right, var(--electric-blue), var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: radial-gradient(circle, var(--neon-cyan), var(--electric-blue));
      border-radius: 50%;
      box-shadow: 0 0 12px var(--neon-cyan);
    }

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

    .nav-links a {
      color: rgba(255, 255, 255, 0.75);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--neon-cyan);
      transition: width 0.25s ease;
    }

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

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

    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      scroll-margin-top: var(--nav-height);
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      background: linear-gradient(to right, var(--white), var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-block;
    }

    .section-title p {
      max-width: 600px;
      margin: 0.5rem auto 0;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: var(--nav-height);
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11, 12, 30, 0.92) 0%, rgba(11, 12, 30, 0.5) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    .hero h1 {
      margin-bottom: 1.5rem;
    }

    .hero .subtitle {
      font-size: 1.3rem;
      color: rgba(255, 255, 255, 0.8);
      margin-bottom: 2.5rem;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--electric-blue), var(--violet));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 4px 20px rgba(59, 130, 246, 0.5);
      border: none;
    }

    .btn-primary:hover {
      box-shadow: var(--neon-glow);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--electric-blue);
      color: var(--electric-blue);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
    }

    .btn-ghost:hover {
      background: rgba(59, 130, 246, 0.15);
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }

    /* 痛点 */
    .pain-points {
      background: rgba(255, 255, 255, 0.02);
      backdrop-filter: blur(4px);
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-card);
      padding: 24px;
      color: var(--gray);
      transition: var(--transition);
    }

    /* 解决方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      text-align: left;
    }

    .solution-card:hover {
      transform: translateY(-6px);
      border-color: var(--neon-cyan);
      box-shadow: 0 16px 40px rgba(0, 240, 255, 0.25);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      background: rgba(0, 240, 255, 0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--neon-cyan);
    }

    .solution-card h3 {
      margin-bottom: 12px;
      color: white;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item .number {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(to bottom, var(--neon-cyan), var(--electric-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(168, 85, 247, 0.25);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--violet), var(--electric-blue));
      box-shadow: 0 0 12px var(--violet);
      flex-shrink: 0;
    }

    .quote {
      font-style: italic;
      color: #e2e8f0;
      margin-bottom: 12px;
    }

    .author {
      font-weight: 700;
      color: var(--neon-cyan);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: rgba(255, 255, 255, 0.03);
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      background: transparent;
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.1rem;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      background: rgba(0, 240, 255, 0.03);
      color: var(--gray);
      padding: 0 24px;
    }

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

    .faq-item.open .faq-question {
      color: var(--neon-cyan);
    }

    /* CTA 表单 */
    .contact-form {
      max-width: 600px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-card);
      padding: 40px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    input, textarea {
      width: 100%;
      padding: 14px 16px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-input);
      color: white;
      font-family: var(--font-primary);
      transition: var(--transition);
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
    }

    .submit-btn {
      width: 100%;
      background: linear-gradient(135deg, var(--electric-blue), var(--violet));
      color: white;
      padding: 16px;
      font-weight: 700;
      font-size: 1.2rem;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 20px rgba(59, 130, 246, 0.6);
    }

    .submit-btn:hover {
      box-shadow: var(--neon-glow);
    }

    /* 页脚 */
    .footer {
      background: rgba(0, 0, 0, 0.5);
      backdrop-filter: blur(8px);
      padding: 40px 0;
      text-align: center;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-links {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin: 20px 0;
      flex-wrap: wrap;
    }

    .footer-links a {
      color: var(--gray);
    }

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

    .copyright {
      color: var(--gray);
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .solutions-grid, .pain-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(11, 12, 30, 0.96);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .solutions-grid, .pain-grid, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero h1 {
        font-size: 2.8rem;
      }
    }