/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-hover: #C8311F;
      --secondary: #1A1A2E;
      --bg: #F9F9FB;
      --accent: #FFB800;
      --success: #0ECB81;
      --text: #1A1A2E;
      --text-muted: #5A5A72;
      --border: #E6E6ED;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-sm: 0 2px 12px rgba(26,26,46,0.06);
      --shadow-hover: 0 8px 24px rgba(228,61,42,0.12);
      --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --spacing-section: 80px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font);
      background-color: var(--bg);
      color: var(--text);
      font-size: 16px;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      letter-spacing: 0;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      color: var(--white);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(228,61,42,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: var(--white);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--white);
      color: var(--white);
    }
    .btn-ghost:hover {
      background: var(--white);
      color: var(--secondary);
    }
    /* 导航 */
    .site-header {
      background: var(--white);
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .header-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      padding: 12px 0;
      gap: 16px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo small {
      font-size: 13px;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0;
    }
    .search-wrap {
      flex: 1;
      min-width: 280px;
      position: relative;
      margin: 0 20px;
    }
    .search-wrap input {
      width: 100%;
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: 24px;
      padding: 12px 20px 12px 44px;
      font-size: 15px;
      color: var(--text);
      transition: border 0.25s, box-shadow 0.25s;
    }
    .search-wrap input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(228,61,42,0.15);
    }
    .search-wrap i {
      position: absolute;
      left: 18px;
      top: 50%;
      transform: translateY(-50%);
      color: #9A9AAF;
      font-size: 16px;
    }
    .nav-menu {
      display: flex;
      gap: 24px;
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 6px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--secondary);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(26,26,46,0.75) 0%, rgba(26,26,46,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 70vh;
      display: flex;
      align-items: center;
      color: var(--white);
      position: relative;
    }
    .hero-content {
      max-width: 700px;
      padding: 40px 0;
    }
    .hero h1 {
      font-size: 48px;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 板块 */
    section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      margin-bottom: 48px;
      text-align: center;
    }
    .section-title h2 {
      display: inline-block;
      position: relative;
    }
    .section-title h2::after {
      content: '';
      display: block;
      width: 50px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    /* 核心优势 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 24px;
    }
    .advantage-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      position: relative;
      border-left: 4px solid transparent;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--primary);
    }
    .advantage-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    /* 产品服务卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: all 0.3s;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-badge {
      position: absolute;
      top: 16px;
      left: 16px;
      background: var(--accent);
      color: var(--secondary);
      font-size: 13px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .service-body {
      padding: 24px;
    }
    .service-body h3 {
      margin-bottom: 10px;
    }
    .service-body p {
      color: var(--text-muted);
      margin-bottom: 18px;
    }
    .link-arrow {
      font-weight: 600;
      color: var(--primary);
      font-size: 15px;
    }
    /* 成功案例 */
    .case-block {
      display: flex;
      gap: 32px;
      align-items: center;
      margin-bottom: 48px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .case-block.reverse {
      flex-direction: row-reverse;
    }
    .case-data {
      flex: 1;
    }
    .case-highlight {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .case-quote {
      flex: 2;
      font-style: italic;
      color: var(--text-muted);
      border-left: 4px solid var(--primary);
      padding-left: 24px;
    }
    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 64px;
    }
    .solution-img {
      flex: 1;
      height: 280px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
    }
    .solution-text {
      flex: 1;
    }
    .solution-text ul {
      list-style: none;
      padding: 0;
    }
    .solution-text li {
      margin-bottom: 10px;
      padding-left: 20px;
      position: relative;
    }
    .solution-text li::before {
      content: '✓';
      color: var(--success);
      font-weight: bold;
      position: absolute;
      left: 0;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      cursor: pointer;
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-q {
      color: var(--primary);
      font-weight: 700;
      margin-right: 10px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 16px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--secondary);
      color: var(--white);
      text-align: center;
      padding: 64px 20px;
    }
    .cta-banner h2 {
      margin-bottom: 16px;
    }
    /* 联系表单 */
    .contact-form {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
      margin-top: 32px;
    }
    .contact-form input {
      flex: 1 1 220px;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-input);
      font-size: 15px;
      background: var(--white);
    }
    .contact-form input:focus {
      border-color: var(--primary);
    }
    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: #B0B0C0;
      padding: 56px 0 32px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-grid a {
      color: #B0B0C0;
    }
    .footer-grid a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      margin-top: 40px;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.1);
      text-align: center;
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 38px; }
      h2 { font-size: 28px; }
      .advantage-grid, .service-grid { grid-template-columns: 1fr 1fr; }
      .case-block { flex-direction: column; }
      .case-block.reverse { flex-direction: column; }
      .solution-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .header-inner { flex-wrap: wrap; }
      .search-wrap { order: -1; width: 100%; margin: 0 0 8px; }
      .nav-menu { display: none; flex-direction: column; width: 100%; background: var(--white); padding: 16px; }
      .nav-menu.active { display: flex; }
      .hamburger { display: block; }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .hero { min-height: auto; padding: 80px 20px; text-align: center; }
      .hero-buttons { justify-content: center; }
      .advantage-grid, .service-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section-title h2 { font-size: 24px; }
    }