/* roulang page: index */
:root {
      --primary-green: #1A8A3F;
      --primary-green-hover: #147533;
      --secondary-black: #0F1419;
      --accent-gold: #F5B642;
      --bg-light: #F4F6F9;
      --bg-light-alt: #F8FAFC;
      --text-muted: #5E6E82;
      --white: #FFFFFF;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition-default: 0.3s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.5;
      color: var(--secondary-black);
      background-color: var(--white);
      scroll-behavior: smooth;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: var(--transition-default);
      border-radius: var(--border-radius-btn);
    }

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      transition: background-color 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background-color: transparent;
    }

    .site-header.scrolled {
      background-color: rgba(15, 20, 25, 0.85);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--nav-height);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
    }

    .site-header.scrolled .logo {
      color: var(--white);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background-color: var(--primary-green);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }

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

    .nav-menu {
      display: flex;
      list-style: none;
      gap: 28px;
    }

    .nav-menu a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
      white-space: nowrap;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: var(--primary-green);
      transition: transform 0.25s ease;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      transform: translateX(-50%) scaleX(1);
    }

    .btn-nav {
      background-color: var(--primary-green);
      color: white;
      padding: 10px 22px;
      border-radius: 6px;
      font-weight: 600;
      font-size: 0.95rem;
      white-space: nowrap;
    }

    .btn-nav:hover {
      background-color: var(--primary-green-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.3s;
      border-radius: 2px;
    }

    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background-color: var(--secondary-black);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

    .mobile-menu.active {
      transform: translateY(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 1.3rem;
      font-weight: 500;
      letter-spacing: 0.5px;
    }

    /* Hero */
    .hero-section {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, rgba(15,20,25,0.75) 0%, rgba(15,20,25,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      position: relative;
    }

    .hero-content {
      max-width: 800px;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content .subtitle {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary-gold {
      background-color: var(--accent-gold);
      color: var(--secondary-black);
      padding: 16px 36px;
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      font-size: 1.1rem;
    }

    .btn-primary-gold:hover {
      background-color: #e0a830;
    }

    .btn-outline {
      border: 2px solid var(--primary-green);
      color: white;
      padding: 14px 34px;
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      font-size: 1.1rem;
      background: transparent;
    }

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

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-alt {
      background-color: var(--bg-light-alt);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary-black);
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background-color: var(--primary-green);
      border-radius: 2px;
    }

    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    /* 价值主张 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 48px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-default);
    }

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

    .feature-icon {
      width: 56px;
      height: 56px;
      background-color: rgba(26,138,63,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-green);
    }

    /* 功能分组 手风琴风格 */
    .accordion-grid {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 40px;
    }

    .accordion-item {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 20px 28px;
      box-shadow: var(--card-shadow);
      cursor: pointer;
    }

    .accordion-header {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    /* 场景横向滚动 */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      margin-top: 36px;
    }

    .scenario-card {
      min-width: 300px;
      background: white;
      border-radius: var(--border-radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-top: 40px;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-green);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: flex;
      gap: 30px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 48px;
    }

    .pricing-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 36px;
      box-shadow: var(--card-shadow);
      flex: 1;
      min-width: 260px;
      max-width: 320px;
      position: relative;
    }

    .pricing-card.featured {
      border: 2px solid var(--primary-green);
      transform: scale(1.02);
    }

    .badge {
      background: var(--accent-gold);
      color: var(--secondary-black);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 32px;
    }

    .faq-item {
      background: white;
      padding: 20px 24px;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
    }

    /* CTA 横幅 */
    .cta-band {
      background-color: var(--secondary-black);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
      padding: 60px 0;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .main-nav .nav-menu, .main-nav .btn-nav { display: none; }
      .hamburger { display: flex; }
      .hero-content h1 { font-size: 2.5rem; }
      .features-grid { grid-template-columns: 1fr; }
      .scenario-scroll { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }