/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-dark: #D94A1A;
      --secondary: #1A1A1A;
      --bg: #F7F5F0;
      --accent: #FFC107;
      --success: #0B8A5D;
      --white: #ffffff;
      --gray-light: #F0EFEB;
      --gray-border: #EAE8E3;
      --text: #333333;
      --text-dark: #1A1A1A;
      --shadow-xs: 0 2px 6px rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --transition: all 0.2s ease;
      --container: 1200px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-weight: 400;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

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

    /* 板块通用间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* 标题标准 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--secondary);
      position: relative;
      padding-left: 25px;
      margin-bottom: 50px;
    }
    .section-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 5px;
      bottom: 5px;
      width: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.6rem;
        padding-left: 18px;
      }
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 100;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    #header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height:70px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--secondary);
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: #fff;
      padding: 10px 24px;
      border-radius: 8px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--secondary);
      border-radius: 4px;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg);
        flex-direction: column;
        padding: 30px 0;
        gap: 28px;
        transform: translateY(-200%);
        transition: 0.3s ease;
        box-shadow: var(--shadow-sm);
      }
      .nav-links.open {
        transform: translateY(0);
      }
      .menu-toggle {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
        width: max-content;
        margin-top: 10px;
      }
    }

    /* 英雄区 */
    #hero {
      padding-top: 140px;
      padding-bottom: 120px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      color: #fff;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.2) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 600px;
    }
    .hero-content h1 {
      font-size: 2.75rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: #fff;
    }
    .hero-content .highlight {
      color: var(--primary);
      border-bottom: 3px solid var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      margin-bottom: 40px;
      opacity: 0.9;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: 2px solid var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--white);
      color: #fff;
    }
    .btn-outline:hover {
      background: var(--white);
      color: var(--secondary);
    }
    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2rem;
      }
    }

    /* 价值卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .value-card {
      background: var(--white);
      border: 1px solid var(--gray-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: var(--transition);
    }
    .value-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .icon-badge {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: #fff;
      font-size: 1.4rem;
    }
    .value-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 功能交替布局 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text, .feature-img {
      flex: 1;
    }
    .feature-img img {
      border-radius: var(--radius-md);
      width: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }

    /* 场景卡片 */
    .grid-scenarios {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--secondary);
      color: #fff;
      border-radius: var(--radius-md);
      padding: 30px;
      transition: 0.2s;
      border: 1px solid transparent;
    }
    .scenario-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    /* 案例数据 */
    .cases-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .stat-block {
      flex: 1;
    }
    .big-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--gray-border);
      text-align: center;
    }
    .price-card.featured {
      background: var(--primary);
      color: #fff;
      transform: scale(1.02);
      border-color: var(--primary);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--gray-border);
      margin-bottom: 8px;
    }
    .faq-question {
      padding: 16px 10px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 10px 18px;
      display: none;
      color: var(--text);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 联系表单 */
    .contact-wrap {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .contact-form {
      flex:1;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    input, textarea {
      padding: 12px;
      border: 1px solid var(--gray-border);
      border-radius: 6px;
    }
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 50px 0 20px;
      border-top: 2px solid var(--primary);
    }
    /* 响应式调整 */
    @media (max-width: 768px) {
      .grid-3, .grid-scenarios, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrap {
        flex-direction: column;
      }
    }