/* roulang page: index */
:root {
      --primary-orange: #FF4D2E;
      --primary-orange-hover: #E63E1F;
      --deep-black: #0B0E14;
      --gold-accent: #F5A623;
      --smoke-white: #F2F4F6;
      --charcoal: #2A2E35;
      --light-gray: #9BA1AC;
      --neon-green: #00E676;
      --alert-red: #FF1744;
      --card-shadow-dark: 0 8px 30px rgba(0,0,0,0.35);
      --card-shadow-light: 0 4px 20px rgba(0,0,0,0.08);
      --border-radius-lg: 12px;
      --border-radius-md: 8px;
      --transition-smooth: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-black);
      color: var(--charcoal);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(245, 166, 35, 0.2);
      transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
    }

    .main-header.scrolled {
      background: rgba(11, 14, 20, 0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-orange);
      text-decoration: none;
      letter-spacing: 1px;
      white-space: nowrap;
    }

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

    .nav-links a {
      color: #ffffff;
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-cta {
      background: var(--neon-green);
      color: var(--deep-black) !important;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700 !important;
      transition: all var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(0,230,118,0.35);
    }

    .nav-cta:hover {
      background: #00c853;
      transform: scale(1.03);
      color: var(--deep-black) !important;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11,14,20,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 28px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-bottom: 1px solid var(--gold-accent);
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        width: 100%;
        text-align: center;
        padding: 14px;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(11, 14, 20, 0.65);
      position: relative;
      color: white;
      padding-top: 80px;
      overflow: hidden;
    }

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

    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero h1 span {
      color: var(--primary-orange);
    }

    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 40px;
      max-width: 550px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--neon-green);
      color: var(--deep-black);
      padding: 16px 40px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 18px;
      text-decoration: none;
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(0,230,118,0.4);
      transition: all var(--transition-smooth);
      display: inline-block;
    }
    .btn-primary:hover {
      background: #00c853;
      transform: translateY(-3px);
      box-shadow: 0 15px 30px rgba(0,230,118,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--gold-accent);
      color: var(--gold-accent);
      padding: 16px 40px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 18px;
      text-decoration: none;
      transition: all var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(245,166,35,0.1);
      border-color: #fff;
      color: #fff;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero p {
        font-size: 16px;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        text-align: center;
        padding: 16px;
      }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--deep-black);
    }
    .section-subtitle {
      color: var(--light-gray);
      margin-bottom: 50px;
    }

    .bg-light {
      background: var(--smoke-white);
      color: var(--charcoal);
    }
    .bg-dark {
      background: var(--deep-black);
      color: white;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pain-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(4px);
      padding: 32px;
      border-radius: var(--border-radius-lg);
      border-left: 4px solid var(--gold-accent);
    }
    .pain-card h3 {
      color: white;
      margin: 16px 0 12px;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: white;
      padding: 32px;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow-light);
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-dark);
    }

    /* 功能矩阵 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: rgba(255,255,255,0.06);
      padding: 30px;
      border-radius: var(--border-radius-lg);
    }
    .icon-gold { color: var(--gold-accent); font-size: 32px; margin-bottom: 16px; }

    /* 数据带 */
    .stats-band {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-number {
      font-size: 52px;
      font-weight: 800;
      color: var(--primary-orange);
    }

    /* 证言 */
    .testimonial-slider {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      padding: 28px;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--card-shadow-light);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--border-radius-md);
      margin-bottom: 16px;
      border-left: 4px solid var(--primary-orange);
    }
    .faq-question {
      padding: 20px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--light-gray);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #FF4D2E, #0B0E14);
      border-radius: 28px;
      padding: 60px 40px;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #0B0E14;
      color: var(--light-gray);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .pain-grid, .solution-grid, .feature-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 28px;
      }
    }