/* roulang page: index */
:root {
      --green: #0A9E5A;
      --green-hover: #08804A;
      --orange: #FF6B35;
      --orange-hover: #E55A2B;
      --dark-bg: #1A1D23;
      --light-bg: #F5F7FA;
      --white: #FFFFFF;
      --text-primary: #2D3436;
      --text-secondary: #636E72;
      --border-light: #E0E0E0;
      --shadow-sm: 0 2px 16px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
      --radius: 12px;
      --radius-btn: 8px;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      color: var(--text-primary);
      background: var(--white);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      letter-spacing: 0.5px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      gap: 8px;
    }
    .btn-primary {
      background: var(--green);
      color: white;
      padding: 14px 32px;
      box-shadow: 0 2px 8px rgba(10,158,90,0.3);
    }
    .btn-primary:hover {
      background: var(--green-hover);
      box-shadow: 0 4px 14px rgba(10,158,90,0.4);
    }
    .btn-outline {
      background: transparent;
      color: var(--green);
      border: 2px solid var(--green);
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: var(--green);
      color: white;
    }
    .btn-cta {
      background: var(--orange);
      color: white;
      padding: 16px 40px;
      font-size: 18px;
      border-radius: var(--radius-btn);
    }
    .btn-cta:hover {
      background: var(--orange-hover);
      transform: scale(1.03);
    }
    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: #1A1D23;
    }
    .logo-icon {
      background: var(--green);
      width: 36px;
      height: 36px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
    }
    .nav-menu a::after {
      content: '';
      display: block;
      width: 0;
      height: 2px;
      background: var(--green);
      transition: width 0.2s;
      margin-top: 4px;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: #1A1D23;
    }
    #menu-toggle {
      display: none;
    }
    /* Hero */
    #hero {
      padding: 80px 0;
      background: var(--white);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    h1 {
      font-size: 42px;
      line-height: 1.2;
      font-weight: 700;
      color: #1A1D23;
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 540px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .hero-badges {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: #F0F4F8;
      border-radius: 30px;
      padding: 8px 18px;
      font-size: 15px;
      font-weight: 600;
      color: #1A1D23;
    }
    .badge-item span {
      color: var(--orange);
      font-weight: 700;
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      font-weight: 700;
      color: #1A1D23;
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 16px;
    }
    /* 亮点网格 */
    #highlights {
      background: var(--light-bg);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--green);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 28px;
    }
    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 优势 */
    #advantages .adv-grid {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .adv-left img {
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .adv-right {
      flex: 1;
    }
    .adv-item {
      display: flex;
      gap: 16px;
      margin-bottom: 28px;
    }
    .adv-num {
      font-size: 28px;
      font-weight: 700;
      color: var(--orange);
      min-width: 40px;
    }
    .adv-text h4 {
      font-weight: 600;
      margin-bottom: 6px;
    }
    /* 案例瀑布 */
    #cases .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 24px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: var(--green);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-title {
      font-weight: 600;
      margin-bottom: 6px;
    }
    /* 方案对比 */
    #compare {
      background: var(--light-bg);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .plan-card.recommended {
      border-left: 4px solid var(--green);
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--orange);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .plan-name {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .plan-price {
      font-size: 28px;
      font-weight: 700;
      color: var(--orange);
      margin-bottom: 16px;
    }
    .plan-features {
      list-style: none;
      margin-bottom: 24px;
    }
    .plan-features li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check-green {
      color: var(--green);
    }
    .check-gray {
      color: #B2BEC3;
    }
    /* FAQ */
    #faq {
      background: var(--white);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #E0E0E0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-icon {
      transition: transform 0.3s;
      color: var(--green);
    }
    /* CTA */
    #cta {
      background: var(--dark-bg);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    #cta h2 {
      color: white;
    }
    #cta .btn-cta {
      margin-top: 24px;
    }
    /* Footer */
    #footer {
      background: var(--dark-bg);
      color: #B2BEC3;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-brand p {
      margin: 12px 0;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      cursor: pointer;
      color: #B2BEC3;
    }
    .footer-links h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      color: #B2BEC3;
    }
    .copyright {
      text-align: center;
      margin-top: 32px;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid, .adv-grid {
        flex-direction: column;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      h2 { font-size: 24px; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 16px 24px;
        box-shadow: var(--shadow-sm);
      }
      #menu-toggle:checked ~ .nav-menu {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .grid-3, .compare-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-badges {
        flex-direction: column;
        gap: 8px;
      }
    }