/* roulang page: index */
:root {
      --primary: #1A5F3A;
      --primary-hover: #154A2E;
      --accent: #E85D04;
      --accent-hover: #cc5200;
      --bg: #FAFAF8;
      --dark-bg: #0F2B1D;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8A8A8A;
      --border-light: #e0e0da;
      --white: #ffffff;
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-tag: 4px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.06);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease-out;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: box-shadow var(--transition);
      border-bottom: 1px solid transparent;
    }
    .header.scrolled {
      box-shadow: var(--shadow-sm);
      border-bottom-color: var(--border-light);
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-menu {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      box-shadow: 0 2px 6px rgba(26,95,58,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(26,95,58,0.25);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--white);
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      box-shadow: 0 6px 16px rgba(232,93,4,0.3);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      color: var(--text-main);
    }
    .hero-left h1 span {
      color: var(--accent);
    }
    .hero-left .sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-right {
      flex: 1;
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(26,95,58,0.35) 0%, rgba(15,43,29,0.2) 100%);
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
      color: var(--text-main);
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }
    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      position: relative;
    }
    .advantage-item {
      display: flex;
      flex-direction: column;
      border-right: 1px solid var(--border-light);
      padding-right: 2rem;
    }
    .advantage-item:last-child {
      border-right: none;
    }
    .adv-number {
      font-family: 'Inter', sans-serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1;
    }
    .adv-title {
      font-size: 1.3rem;
      font-weight: 600;
      margin: 0.8rem 0 0.5rem;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .highlight-card {
      border-bottom: 1px solid var(--border-light);
      padding-bottom: 1.5rem;
      transition: transform var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-6px);
    }
    .highlight-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-card);
      margin-bottom: 1.2rem;
      transition: transform var(--transition);
    }
    .highlight-card:hover .highlight-img {
      transform: scale(1.03);
    }
    .highlight-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      position: relative;
    }
    .highlight-card h3::after {
      content: '';
      display: block;
      width: 24px;
      height: 3px;
      background: var(--accent);
      margin-top: 0.5rem;
      transition: width var(--transition);
    }
    .highlight-card:hover h3::after {
      width: 40px;
    }
    /* 案例瀑布 */
    .case-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      border-left: 4px solid var(--accent);
    }
    .case-img img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }
    .case-text {
      flex: 1;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 1rem;
    }
    /* 对比表 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .compare-table {
      flex: 1;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-row {
      display: flex;
      padding: 1rem 2rem;
      border-bottom: 1px solid #f0f0ea;
    }
    .compare-row.header {
      background: var(--primary);
      color: white;
      font-weight: 600;
    }
    .compare-cell {
      flex: 1;
    }
    .vs-badge {
      background: var(--accent);
      color: white;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      box-shadow: 0 6px 14px rgba(232,93,4,0.3);
    }
    .fa-check { color: var(--primary); }
    .fa-times { color: #ccc; }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.1rem;
      position: relative;
      padding-left: 18px;
    }
    .faq-question::before {
      content: '';
      position: absolute;
      left: 0;
      top: 4px;
      width: 4px;
      height: 20px;
      background: var(--accent);
      transition: all var(--transition);
      border-radius: 2px;
    }
    .faq-item.active .faq-question::before {
      background: var(--primary);
      height: 28px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s;
      color: var(--text-secondary);
      padding-left: 18px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-top: 0.8rem;
    }
    /* CTA横幅 */
    .cta-banner {
      background: var(--dark-bg);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-banner h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .cta-banner span {
      color: var(--accent);
    }
    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; border-right: none; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu {
        position: fixed; top: 72px; left: 0; width: 100%; height: calc(100vh - 72px);
        background: var(--white); flex-direction: column; align-items: center; justify-content: center;
        gap: 2rem; transform: translateX(100%); transition: transform 0.3s; z-index: 99;
      }
      .nav-menu.active { transform: translateX(0); }
      .header .btn-primary { display: none; }
      .header .container { justify-content: space-between; }
      .hero-left h1 { font-size: 32px; }
      section { padding: 60px 0; }
      .case-row, .case-row.reverse { flex-direction: column; }
      .compare-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }