/* roulang page: index */
:root {
      --primary: #00A86B;
      --primary-hover: #008F5A;
      --secondary: #FF6B35;
      --secondary-hover: #E55A2B;
      --dark-bg: #0B1E2E;
      --light-bg: #F5F7FA;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #6B7280;
      --border-color: #E5E7EB;
      --radius: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,168,107,0.12);
      --transition: all 0.25s ease;
      --max-width: 1200px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #fff;
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    h1, h2, h3, h4 {
      color: var(--text-main);
      line-height: 1.25;
    }

    h1 {
      font-size: 48px;
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 30, 46, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      height: var(--header-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .site-header.scrolled {
      background: var(--dark-bg);
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: #fff;
    }
    .logo i {
      font-size: 28px;
      color: var(--secondary);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-menu a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      font-size: 15px;
    }

    .nav-menu a:hover {
      color: #fff;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--secondary);
      transition: width 0.3s ease;
    }

    .nav-menu a:hover::after {
      width: 100%;
    }

    .btn-primary-nav {
      background: var(--secondary);
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-primary-nav:hover {
      background: var(--secondary-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: #fff;
      transition: 0.3s;
    }

    #mobileDrawer {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: var(--dark-bg);
      padding: 30px 20px;
      z-index: 1100;
      transition: right 0.35s ease;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    #mobileDrawer.active {
      right: 0;
    }
    #mobileDrawer a {
      color: #fff;
      font-size: 18px;
      font-weight: 500;
      display: block;
      padding: 10px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 50px;
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 700px;
      margin: 16px auto 0;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(0,168,107,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .btn-secondary {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: #fff;
    }

    .btn-cta {
      background: var(--secondary);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-cta:hover {
      background: var(--secondary-hover);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B1E2E 0%, #002B1A 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 50%, rgba(0,168,107,0.1) 0%, transparent 60%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      color: #fff;
      font-size: 52px;
    }
    .hero-text p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin: 24px 0 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0%{transform:translateY(0);}
      50%{transform:translateY(-20px);}
      100%{transform:translateY(0);}
    }

    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .feature-card {
      background: #fff;
      padding: 32px 24px;
      text-align: center;
      border-radius: var(--radius);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      width: 70px;
      height: 70px;
      background: rgba(0,168,107,0.1);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 32px;
    }

    /* 功能交替块 */
    .feature-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 70px;
      margin-bottom: 90px;
    }
    .feature-block.reverse {
      direction: ltr;
    }
    .feature-block.reverse .feature-content {
      order: 1;
    }
    .feature-content h2 {
      margin-bottom: 20px;
    }
    .check-list {
      list-style: none;
      margin: 24px 0;
    }
    .check-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 14px;
      color: var(--text-body);
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .scenario-card {
      border-radius: var(--radius);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      height: 200px;
      background-size: cover;
    }
    .scenario-body {
      padding: 20px;
    }
    .tag {
      background: rgba(0,168,107,0.1);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }

    /* 案例 */
    .cases-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .big-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--primary);
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .pricing-card {
      background: #fff;
      padding: 38px 28px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-card);
      text-align: center;
      border: 1px solid var(--border-color);
    }
    .pricing-card.recommended {
      border-top: 4px solid var(--secondary);
      transform: scale(1.03);
    }
    .price {
      font-size: 40px;
      font-weight: 800;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 12px;
    }
    .faq-question {
      width: 100%;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: var(--text-main);
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f9fafb;
      padding: 0 16px;
      border-radius: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA横幅 */
    .cta-strip {
      background: var(--primary);
      text-align: center;
      color: #fff;
      padding: 70px 0;
    }

    /* 页脚 */
    .site-footer {
      background: var(--dark-bg);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 38px; }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .scenario-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      section { padding: 60px 0; }
      h2 { font-size: 28px; }
      .features-grid, .scenario-grid { grid-template-columns: 1fr; }
      .feature-block { grid-template-columns: 1fr; gap: 30px; }
      .cases-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .pricing-card.recommended { transform: none; }
    }