/* roulang page: index */
:root {
      --south-orange: #E87722;
      --orange-hover: #D1651A;
      --business-blue: #2C3E50;
      --accent-green: #16A085;
      --body-bg: #F8F9FA;
      --white: #FFFFFF;
      --title-color: #1A1A1A;
      --text-color: #4A4A4A;
      --light-text: #7F8C8D;
      --border-light: #ECF0F1;
      --border-input: #DCDCDC;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --spacing-section: 80px;
      --spacing-gap: 24px;
      --max-width: 1200px;
      --font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-en: 'Inter', 'Roboto', sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-zh);
      background-color: var(--body-bg);
      color: var(--text-color);
      line-height: 1.4;
      -webkit-font-smoothing: antialiased;
      padding-top: 0;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--title-color);
    }

    h1 {
      font-size: 32px;
      line-height: 40px;
      letter-spacing: -0.5px;
      font-weight: 700;
    }
    h2 {
      font-size: 24px;
      line-height: 32px;
      font-weight: 600;
    }
    h3 {
      font-size: 18px;
      line-height: 28px;
      font-weight: 600;
    }
    h4 {
      font-weight: 600;
      color: var(--title-color);
    }

    p, .text-body {
      font-size: 15px;
      line-height: 26px;
      color: var(--text-color);
    }

    .small-text {
      font-size: 13px;
      line-height: 20px;
      font-weight: 500;
      color: var(--light-text);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-zh);
      display: inline-block;
      transition: all var(--transition);
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--south-orange);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 8px rgba(232,119,34,0.15);
    }
    .btn-primary:hover {
      background-color: var(--orange-hover);
      box-shadow: 0 4px 12px rgba(232,119,34,0.3);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--south-orange);
      color: var(--south-orange);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
    }
    .btn-outline:hover {
      background: #FFF5ED;
      color: var(--orange-hover);
    }

    /* 导航固定顶部 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 999;
      padding: 0;
      height: 70px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-area a {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }
    .brand-name {
      font-size: 22px;
      font-weight: 700;
      color: var(--business-blue);
      font-family: var(--font-zh);
      letter-spacing: 0.5px;
    }
    .brand-domain {
      font-size: 12px;
      color: var(--light-text);
      font-family: var(--font-en);
      letter-spacing: 0.2px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--business-blue);
      font-weight: 500;
      font-size: 15px;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover {
      color: var(--south-orange);
    }
    .nav-links a.active {
      color: var(--south-orange);
      border-bottom: 2px solid var(--south-orange);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--business-blue);
    }

    /* Hero双栏 */
    .hero-section {
      padding: 140px 0 80px;
      background-color: var(--body-bg);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      margin-bottom: 20px;
      color: var(--title-color);
    }
    .hero-sub {
      font-size: 17px;
      color: var(--text-color);
      margin-bottom: 28px;
    }
    .hero-right {
      flex: 1;
      position: relative;
    }
    .hero-img {
      width: 100%;
      border-radius: 24px;
      box-shadow: var(--shadow-card);
      object-fit: cover;
      aspect-ratio: 4/3;
      background: #ddd;
    }

    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      text-align: left;
      margin-bottom: 40px;
      position: relative;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--spacing-gap);
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: box-shadow var(--transition);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .highlight-img {
      width: 64px;
      height: 64px;
      border-radius: 12px;
      object-fit: cover;
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      margin-bottom: 10px;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .case-item {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      transition: box-shadow 0.2s, transform 0.2s;
    }
    .case-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .case-img {
      width: 100%;
      display: block;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-item:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px 20px;
    }
    .case-tag {
      display: inline-block;
      background: #FFF5ED;
      color: var(--south-orange);
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px 24px;
      flex: 1 1 280px;
      max-width: 350px;
      display: flex;
      flex-direction: column;
      border: 2px solid transparent;
      transition: all 0.2s;
    }
    .plan-featured {
      border-color: var(--south-orange);
      box-shadow: 0 8px 28px rgba(232,119,34,0.1);
      position: relative;
    }
    .plan-badge {
      position: absolute;
      top: 14px;
      right: 14px;
      background: var(--south-orange);
      color: white;
      font-size: 13px;
      padding: 4px 14px;
      border-radius: 20px;
    }
    .plan-list {
      list-style: none;
      margin: 24px 0;
    }
    .plan-list li {
      margin-bottom: 14px;
      font-size: 15px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: white;
      border: none;
      text-align: left;
      padding: 20px 0;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      color: var(--title-color);
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.2s;
      background: #F8F9FA;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--south-orange);
    }

    .contact-section {
      background: var(--white);
      text-align: center;
    }
    .contact-form {
      max-width: 580px;
      margin: 30px auto 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-form input, .contact-form textarea {
      background: white;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      padding: 14px;
      font-family: var(--font-zh);
      font-size: 15px;
      transition: 0.15s;
      outline: none;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--south-orange);
      box-shadow: 0 0 0 3px rgba(232,119,34,0.1);
    }

    .footer {
      background: var(--business-blue);
      color: #BDC3C7;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    .footer a {
      color: #BDC3C7;
    }
    .footer a:hover {
      color: var(--south-orange);
    }

    @media (max-width: 1023px) {
      .hero-grid {
        flex-direction: column;
      }
      .cases-masonry {
        column-count: 2;
      }
      .highlights-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 26px; line-height: 34px; }
      h2 { font-size: 20px; }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .highlights-grid, .footer-grid { grid-template-columns: 1fr; }
      .cases-masonry { column-count: 1; }
      .hero-section { padding-top: 110px; }
    }