/* roulang page: index */
:root {
      --primary: #2C4A2E;
      --primary-dark: #1E3320;
      --accent: #E8611A;
      --accent-hover: #C94E10;
      --bg-light: #F7F7F5;
      --bg-warm: #F4EFE6;
      --text-dark: #1A1A1A;
      --text-mid: #5A5A5A;
      --text-light: #F5F5F5;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 15px rgba(0,0,0,0.05);
      --shadow-md: 0 8px 25px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 35px rgba(0,0,0,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 20px;
      --font-heading: 'Oswald', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease;
      --container: 1200px;
      --header-height: 80px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -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;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.97);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1000;
      height: var(--header-height);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
      flex-wrap: wrap;
    }
    .nav-chip {
      background: #E8EDE8;
      color: var(--primary-dark);
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--primary);
      color: white;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 6px;
      font-size: 1rem;
      box-shadow: 0 4px 10px rgba(232,97,26,0.25);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 18px rgba(232,97,26,0.3);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: 6px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 6px;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary);
      background: none;
      border: none;
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .header .btn-primary {
        display: none;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
      }
      .mobile-menu.open {
        display: flex;
      }
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    /* Hero */
    .hero {
      min-height: 85vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: var(--header-height);
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(44,74,46,0.8) 0%, rgba(30,30,30,0.5) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.8rem, 6vw, 4.2rem);
      font-weight: 700;
      line-height: 1.1;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero p {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 36px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .pain-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .pain-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary-dark);
      letter-spacing: -0.3px;
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .solution-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }
    .solution-text {
      padding: 24px;
    }
    /* 成果 */
    .stats-section {
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      position: relative;
    }
    .stats-overlay {
      background: rgba(44,74,46,0.9);
      padding: 80px 0;
    }
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
      color: white;
    }
    .stat-item {
      text-align: center;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      padding: 32px 40px;
      border-radius: var(--radius-md);
    }
    .stat-number {
      font-family: var(--font-heading);
      font-size: 3.5rem;
      color: var(--accent);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .testimonial-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      border-left: 5px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      font-weight: 600;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      background: none;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-mid);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-final {
      background: linear-gradient(90deg, var(--primary) 0%, #1e3a20 100%);
      color: white;
      text-align: center;
    }
    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .pain-grid, .solution-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        flex-direction: column;
        align-items: center;
      }
    }