/* roulang page: index */
:root {
      --primary: #1B5E20;
      --primary-light: #2E7D32;
      --accent: #F57C00;
      --accent-hover: #E65100;
      --bg-warm: #F5F0EB;
      --text-dark: #2C3E50;
      --text-soft: #546E7A;
      --white: #FFFFFF;
      --border-light: #ECEFF1;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(27,94,32,0.12);
      --radius-md: 16px;
      --radius-sm: 8px;
      --font-main: 'Noto Sans SC', system-ui, sans-serif;
      --font-number: 'Oswald', 'Noto Sans SC', sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-main);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      -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 32px;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      padding: 16px 0;
    }
    #header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 6px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--primary);
      background: rgba(27,94,32,0.08);
      padding: 8px;
      border-radius: 50%;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-dark);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
      box-shadow: 0 6px 16px rgba(245,124,0,0.25);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(245,124,0,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 26px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(27,94,32,0.08);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.08);
        gap: 28px;
      }
      .nav-links.open {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
    }

    /* Hero */
    #hero {
      padding: 140px 0 80px;
      background: linear-gradient(105deg, #ffffff 60%, rgba(245,240,235,0.4) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2rem;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 380px;
      width: 100%;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        height: 280px;
        order: -1;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-soft);
      font-size: 1.1rem;
    }

    /* 功能卡片 2x2 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--primary);
      background: rgba(27,94,32,0.08);
      padding: 14px;
      border-radius: 16px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景卡片 */
    .scenarios-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scenario-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .season-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(6px);
      color: white;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
    }
    .scenario-content {
      padding: 20px 24px;
    }
    @media (max-width: 768px) {
      .scenarios-row {
        grid-template-columns: 1fr;
      }
    }

    /* 案例/数据 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .case-card {
      background: var(--bg-warm);
      padding: 32px;
      border-radius: var(--radius-md);
      text-align: center;
    }
    .case-number {
      font-family: var(--font-number);
      font-size: 3.2rem;
      color: var(--accent);
      font-weight: 700;
    }
    .avatar {
      width: 64px;
      height: 64px;
      background: #ccc;
      border-radius: 50%;
      margin: 16px auto;
      border: 3px solid white;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      align-items: start;
    }
    .pricing-card {
      background: white;
      padding: 36px 24px;
      border-radius: 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      border: 2px solid transparent;
    }
    .pricing-card.popular {
      border-color: var(--primary);
      transform: scale(1.03);
      box-shadow: 0 18px 32px rgba(27,94,32,0.12);
    }
    .badge {
      background: var(--accent);
      color: white;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.85rem;
      display: inline-block;
      margin-bottom: 16px;
    }
    .price {
      font-family: var(--font-number);
      font-size: 3rem;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .pricing-card.popular {
        transform: none;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-bottom: 1px solid rgba(27,94,32,0.15);
    }
    .faq-question {
      padding: 20px 8px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-soft);
      padding: 0 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* 页脚 */
    #contact {
      background: var(--text-dark);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    button, .btn-primary {
      font-family: inherit;
    }