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

    :root {
      --primary-deep: #1A1F3A;
      --accent-orange: #FF6B35;
      --bg-light: #F8F9FC;
      --white: #FFFFFF;
      --text-main: #2D3142;
      --text-weak: #6B7280;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --max-width: 1200px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      border: none;
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      height: 72px;
      box-shadow: 0 1px 6px rgba(0,0,0,0.02);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      z-index: 999;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent-orange);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>') center/cover no-repeat;
      background-size: contain;
      background-color: var(--primary-deep);
      display: inline-block;
    }

    .nav-menu {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--accent-orange);
      border-bottom-color: var(--accent-orange);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 28px;
      height: 20px;
      cursor: pointer;
    }

    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--primary-deep);
      border-radius: 4px;
      transition: 0.2s;
    }

    .mobile-drawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--white);
      box-shadow: -5px 0 25px rgba(0,0,0,0.08);
      z-index: 1000;
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.3s ease;
    }

    .mobile-drawer.open {
      right: 0;
    }

    .drawer-close {
      align-self: flex-end;
      background: transparent;
      font-size: 28px;
      border: none;
      color: var(--text-main);
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      font-size: 18px;
      color: var(--text-weak);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 56px auto;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 6px 18px rgba(255,107,53,0.18);
    }

    .btn-primary:hover {
      background: #E55A2B;
      box-shadow: 0 10px 24px rgba(255,107,53,0.3);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(26,31,58,0.04);
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 48px;
      padding: 40px 0 80px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      aspect-ratio: 4/3;
    }

    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 20px;
    }

    .hero-gradient {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,31,58,0.6) 0%, rgba(26,31,58,0.2) 100%);
      border-radius: 20px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      line-height: 1.2;
    }

    .hero-subtitle {
      font-size: 20px;
      color: var(--text-weak);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
      flex-wrap: wrap;
    }

    .link-demo {
      font-weight: 600;
      color: var(--primary-deep);
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }

    .link-demo:hover {
      color: var(--accent-orange);
      border-bottom-color: var(--accent-orange);
    }

    /* 优势卡片 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .feature-icon {
      font-size: 40px;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .desc {
      color: var(--text-weak);
      font-size: 15px;
    }

    /* 服务卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }

    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      background-color: #e9ecef;
    }

    .service-body {
      padding: 24px;
    }

    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }

    .tag {
      background: #f1f2f6;
      color: #2D3142;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
    }

    /* 步骤/数据 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }

    .step-item {
      flex: 1 1 180px;
      text-align: center;
    }

    .step-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-orange);
      margin-bottom: 10px;
    }

    .data-highlight {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      display: flex;
      justify-content: space-around;
      text-align: center;
      margin-top: 40px;
    }

    .data-num {
      font-size: 38px;
      font-weight: 700;
      color: var(--primary-deep);
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 300px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
    }

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ccc;
      background-size: cover;
    }

    .testimonial-text {
      font-size: 15px;
      color: var(--text-main);
      line-height: 1.6;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .faq-item {
      background: var(--white);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      background: #fff;
      border: none;
      width: 100%;
      text-align: left;
    }

    .faq-arrow {
      font-size: 18px;
      transition: 0.2s;
    }

    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-weak);
      font-size: 15px;
    }

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

    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(105deg, #1A1F3A 0%, #0f1325 100%);
      color: white;
      border-radius: 24px;
      padding: 64px 40px;
      text-align: center;
    }

    .cta-banner h2 {
      font-size: 38px;
      font-weight: 700;
    }

    /* 页脚 */
    .footer {
      background: #141829;
      color: #9CA3AF;
      padding: 60px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.3fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer a {
      color: #9CA3AF;
      transition: 0.2s;
    }

    .footer a:hover {
      color: var(--accent-orange);
    }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
      }
      .hero h1 { font-size: 34px; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-4, .grid-3 { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .section { padding: 64px 0; }
    }