/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-blue: #0057B3;
      --primary-blue-light: #0070d6;
      --energy-orange: #FF6B35;
      --energy-orange-dark: #e55a2a;
      --white: #FFFFFF;
      --soft-gray: #F8F9FA;
      --deep-slate: #1A2B3C;
      --text-main: #1E293B;
      --text-secondary: #4A5568;
      --text-light: #64748B;
      --border-light: #E2E8F0;
      --shadow-card: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.02);
      --shadow-elevated: 0 20px 35px -10px rgba(0,87,179,0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
      --radius-card: 20px;
      --radius-btn: 50px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3 {
      font-weight: 600;
    }

    /* 导航系统 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(255,255,255,0.3);
      transition: background 0.25s ease, box-shadow 0.25s ease;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 0;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: -0.4px;
      color: var(--primary-blue);
    }
    .logo-domain {
      font-size: 0.75rem;
      color: var(--text-light);
      letter-spacing: 0.3px;
      font-weight: 400;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
      font-size: 0.98rem;
    }
    .nav-links a:hover {
      color: var(--primary-blue);
    }
    .nav-cta {
      background: var(--energy-orange);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: var(--energy-orange-dark);
      transform: scale(1.03);
    }
    .burger {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .mobile-panel {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 99;
      font-size: 1.8rem;
      font-weight: 600;
    }
    .mobile-panel.active {
      display: flex;
    }
    .mobile-panel a {
      color: var(--text-main);
      text-decoration: none;
    }
    .close-burger {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 2.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .bg-soft {
      background-color: var(--soft-gray);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(105deg, rgba(255,255,255,0.95) 40%, rgba(0,87,179,0.03) 100%);
      backdrop-filter: blur(2px);
      padding-top: 90px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -1px;
      line-height: 1.25;
      color: #0F172A;
      margin-bottom: 22px;
    }
    .hero-sub {
      font-size: 1.18rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 420px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--energy-orange);
      color: white;
      font-weight: 700;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--energy-orange-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0,87,179,0.08);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      box-shadow: 0 30px 45px rgba(0,0,0,0.12);
      height: 440px;
    }

    /* 痛点 */
    .pain-header {
      margin-bottom: 50px;
    }
    .pain-layout {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 35px;
    }
    .main-pain-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .pain-side {
      display: flex;
      flex-direction: column;
      gap: 22px;
    }
    .small-pain-item {
      background: white;
      padding: 20px 24px;
      border-radius: 18px;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }

    /* 解决方案 swiper style */
    .solution-scroll {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }
    .product-card {
      min-width: 260px;
      background: white;
      border-radius: 26px;
      padding: 28px 22px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      scroll-snap-align: start;
    }
    .product-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-elevated);
    }

    /* 成果 data dashboard */
    .results-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--primary-blue);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 22px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    footer {
      background: var(--deep-slate);
      color: #E2E8F0;
      padding: 45px 0 28px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2.4rem; }
      .pain-layout { grid-template-columns: 1fr; }
    }