/* roulang page: index */
:root {
      --primary: #C87A3A;
      --primary-hover: #A8622E;
      --primary-soft: rgba(200, 122, 58, 0.08);
      --accent: #E5A84B;
      --dark: #3E2C1F;
      --text: #5C3D2E;
      --text-soft: #7A6A5E;
      --bg: #FAF7F2;
      --bg-warm: #F5F0E8;
      --white: #FFFFFF;
      --border-light: rgba(200, 122, 58, 0.15);
      --shadow-card: 0 4px 20px rgba(92, 61, 46, 0.06);
      --shadow-hover: 0 8px 30px rgba(92, 61, 46, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(250, 247, 242, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: background var(--transition), box-shadow var(--transition);
    }

    .site-header.scrolled {
      background: var(--bg);
      box-shadow: 0 4px 18px rgba(92, 61, 46, 0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo a {
      font-size: 1.6rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text);
      position: relative;
      font-size: 1rem;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 0.5rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(200, 122, 58, 0.2);
    }

    .nav-cta:hover {
      background: var(--primary-hover);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--dark);
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250, 247, 242, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px 0;
        gap: 1.5rem;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 1rem;
      letter-spacing: 0.5px;
    }

    .section-sub {
      color: var(--text-soft);
      font-size: 1.1rem;
      margin-bottom: 3rem;
      max-width: 600px;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(180deg, #FAF7F2 0%, #F5EFE5 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--dark);
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2rem;
    }

    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 0 2px rgba(200,122,58,0.3);
    }

    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: all var(--transition);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(92,61,46,0.15);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 2.4rem;
      }
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .highlight-card {
      background: var(--white);
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }

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

    .icon-circle {
      background: rgba(200,122,58,0.1);
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.2rem;
      color: var(--primary);
      font-size: 1.5rem;
    }

    .highlight-card h3 {
      font-size: 1.25rem;
      margin-bottom: 0.5rem;
      color: var(--dark);
    }

    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 业务杂志流 */
    .magazine-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 2.5rem;
      margin-bottom: 4rem;
    }

    .magazine-row.reverse {
      flex-direction: row-reverse;
    }

    .magazine-img {
      flex: 1 1 45%;
    }

    .magazine-img img {
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }

    .magazine-text {
      flex: 1 1 45%;
    }

    .magazine-text .index {
      color: var(--primary);
      font-weight: 700;
      font-size: 1.2rem;
    }

    .magazine-text h3 {
      font-size: 1.8rem;
      margin: 0.5rem 0;
    }

    @media (max-width: 768px) {
      .magazine-row, .magazine-row.reverse {
        flex-direction: column;
      }
    }

    /* 里程碑数字带 */
    .milestones {
      background: var(--bg-warm);
      padding: 3rem 0;
    }
    .milestone-flex {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .milestone-item h3 {
      font-size: 2.5rem;
      color: var(--primary);
    }

    /* 案例瀑布流 */
    .cases-grid {
      columns: 3;
      column-gap: 1.5rem;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      break-inside: avoid;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-card img {
      transition: transform 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 1.2rem;
    }
    @media (max-width: 768px) {
      .cases-grid {
        columns: 1;
      }
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
    }
    .compare-col {
      flex: 1;
      background: var(--white);
      padding: 2rem;
      border-radius: var(--radius-card);
    }
    .compare-col.highlight {
      border: 2px solid var(--primary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1rem 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s;
      background: var(--bg-warm);
      padding: 0 1rem;
      margin-top: 0.5rem;
      border-radius: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 1rem;
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 0.8rem;
      margin-bottom: 1rem;
      border: 1px solid #ddd;
      border-radius: 8px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--dark);
      color: #D6C8B8;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }