/* roulang page: index */
:root {
      --primary-cyan: #0AEFFF;
      --accent-purple: #B620E0;
      --bg-deepspace: #0B0E14;
      --bg-card: #161B22;
      --text-body: #B0B8C1;
      --text-heading: #FFFFFF;
      --border-dim: rgba(10, 239, 255, 0.12);
      --glow-cyan: rgba(10, 239, 255, 0.25);
      --shadow-card-hover: 0 12px 32px rgba(10, 239, 255, 0.18);
      --radius-md: 12px;
      --radius-sm: 8px;
      --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: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-deepspace);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航区 */
    header.nav {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(10, 239, 255, 0.3);
      transition: var(--transition-smooth);
    }

    .nav-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #0AEFFF 0%, #B620E0 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-flex;
      align-items: center;
      text-decoration: none;
    }

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

    .nav-links a {
      color: var(--text-body);
      text-decoration: none;
      font-weight: 500;
      letter-spacing: 0.02em;
      transition: color 0.2s ease, text-shadow 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
      text-shadow: 0 0 8px rgba(10, 239, 255, 0.5);
    }

    .btn-primary-nav {
      background: linear-gradient(135deg, #0AEFFF 0%, #B620E0 100%);
      color: white;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(182, 32, 224, 0.4);
      border: none;
      display: inline-block;
    }

    .btn-primary-nav:hover {
      box-shadow: 0 8px 24px rgba(182, 32, 224, 0.7);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      font-size: 28px;
      color: var(--primary-cyan);
      background: none;
      border: none;
      cursor: pointer;
    }

    /* Hero 首屏 */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 80px 0;
      min-height: 85vh;
      background-image: radial-gradient(circle at 20% 50%, rgba(10,239,255,0.06) 0%, transparent 40%);
      position: relative;
    }

    .hero-text {
      flex: 1 1 45%;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.1;
      background: linear-gradient(135deg, #FFFFFF 0%, var(--primary-cyan) 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 20px;
      color: var(--text-body);
      margin-bottom: 36px;
      max-width: 540px;
    }

    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-main {
      background: linear-gradient(135deg, #0AEFFF 0%, #B620E0 100%);
      color: #fff;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 8px;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition-smooth);
      box-shadow: 0 0 18px rgba(182, 32, 224, 0.5);
    }

    .btn-main:hover {
      box-shadow: 0 0 28px rgba(10, 239, 255, 0.7);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      background: rgba(10, 239, 255, 0.12);
    }

    .hero-visual {
      flex: 1 1 48%;
      display: flex;
      justify-content: center;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 400px;
      border-radius: 20px;
      border: 1px solid var(--border-dim);
      position: relative;
      overflow: hidden;
    }

    /* 板块结构 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
      letter-spacing: -0.01em;
    }

    .section-lead {
      color: var(--text-body);
      font-size: 18px;
      max-width: 620px;
      margin-bottom: 48px;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
      margin-top: 24px;
    }

    .pain-card {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition-smooth);
      backdrop-filter: blur(5px);
    }

    .pain-card:hover {
      border-color: #B620E0;
      box-shadow: 0 8px 28px rgba(182, 32, 224, 0.25);
      transform: translateY(-5px);
    }

    /* 解决方案网格 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 28px;
    }

    .solution-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-dim);
      transition: var(--transition-smooth);
    }

    .solution-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .solution-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .solution-content {
      padding: 22px;
    }

    /* 数据看板 */
    .stats-board {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      background: rgba(11,14,20,0.7);
      border: 1px solid var(--border-dim);
      border-radius: 20px;
      padding: 48px 28px;
    }

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

    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 56px;
      color: #B620E0;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary-cyan), #B620E0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-dim);
      border-radius: 10px;
      margin-bottom: 14px;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: #fff;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-body);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 终极CTA */
    .cta-full {
      background: linear-gradient(135deg, #0B0E14 0%, #1a1f2b 100%);
      border-top: 2px solid var(--primary-cyan);
      border-bottom: 2px solid #B620E0;
      text-align: center;
      padding: 80px 20px;
    }

    /* 页脚 */
    footer {
      background: #0A0D12;
      padding: 64px 0 32px;
      border-top: 1px solid var(--border-dim);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 { font-size: 44px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-text h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }