/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-deep-green: #0B3D2E;
      --accent-gold: #C9A96E;
      --accent-gold-hover: #B08D4A;
      --bg-warm-white: #F9F9F6;
      --text-charcoal: #2C2C2C;
      --text-light: #5A5A5A;
      --border-light: #E8E8E2;
      --white: #FFFFFF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-button: 50px;
      --radius-faq: 8px;
      --transition-base: 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --container-max: 1200px;
      --section-gap: 80px;
      --card-gap: 24px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm-white);
      color: var(--text-charcoal);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

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

    /* 容器与通用布局 */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 768px) {
      :root {
        --section-gap: 60px;
      }
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    header.main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: var(--white);
      box-shadow: var(--shadow-nav);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep-green);
      letter-spacing: 0.3px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary-deep-green);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-size: 1.2rem;
    }

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

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-charcoal);
      letter-spacing: 0.5px;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition-base);
    }

    .nav-links a:hover {
      color: var(--primary-deep-green);
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep-green);
      border-radius: 2px;
      transition: var(--transition-base);
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        height: calc(100vh - 64px);
        background: rgba(11, 61, 46, 0.95);
        backdrop-filter: blur(8px);
        flex-direction: column;
        justify-content: center;
        gap: 36px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
      }

      .nav-links.active {
        transform: translateX(0);
      }

      .nav-links a {
        color: var(--white);
        font-size: 1.3rem;
        font-weight: 500;
      }

      .nav-links a::after {
        background: var(--accent-gold);
      }

      .hamburger {
        display: flex;
      }
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep-green);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition-base), box-shadow var(--transition-base);
      letter-spacing: 0.3px;
      box-shadow: 0 6px 18px rgba(201, 169, 110, 0.3);
    }

    .btn-primary:hover {
      background: var(--accent-gold-hover);
      box-shadow: 0 10px 24px rgba(176, 141, 74, 0.4);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary-deep-green);
      border: 1.5px solid var(--primary-deep-green);
      padding: 13px 35px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition-base), color var(--transition-base);
    }

    .btn-secondary:hover {
      background: rgba(11, 61, 46, 0.05);
    }

    /* Hero 区域 */
    .hero-section {
      height: 80vh;
      min-height: 550px;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0B3D2E 0%, #1A4F3A 100%);
      position: relative;
      overflow: hidden;
      margin-top: 0;
      padding: 0;
    }

    .hero-bg-texture {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: var(--white);
      padding: 0 20px;
    }

    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2.2rem;
      max-width: 500px;
    }

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

    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 2rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--primary-deep-green);
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }

    .section-subtitle {
      color: var(--text-light);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* 痛点与解决方案 Z型布局 */
    .pain-solution-grid {
      display: flex;
      flex-direction: column;
      gap: 60px;
    }

    .pain-item {
      display: flex;
      align-items: center;
      gap: 50px;
    }

    .pain-item.reverse {
      flex-direction: row-reverse;
    }

    .pain-text, .pain-image {
      flex: 1;
    }

    .pain-image img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .pain-label {
      color: var(--accent-gold);
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.5rem;
    }

    .pain-title {
      font-size: 1.8rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    @media (max-width: 768px) {
      .pain-item, .pain-item.reverse {
        flex-direction: column;
        gap: 30px;
      }
      .pain-title {
        font-size: 1.5rem;
      }
    }

    /* 卡片系统 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--card-gap);
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: box-shadow var(--transition-base), transform var(--transition-base);
    }

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

    .card-icon {
      font-size: 2rem;
      color: var(--accent-gold);
      margin-bottom: 1.2rem;
    }

    .card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }

    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据区 */
    .stats-section {
      background: #F4F4F0;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }

    .stat-item .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary-deep-green);
    }

    .stat-label {
      color: var(--text-light);
      font-size: 1rem;
    }

    /* 证言卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--card-gap);
    }

    .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }

    .testimonial-avatar {
      width: 48px;
      height: 48px;
      background: #E0E0D8;
      border-radius: 50%;
      margin-bottom: 1rem;
    }

    .quote {
      font-style: italic;
      margin-bottom: 1rem;
      color: var(--text-charcoal);
    }

    /* FAQ 手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-faq);
      border: 1px solid var(--border-light);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      text-align: left;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }

    .faq-icon {
      color: var(--accent-gold);
    }

    /* 最终CTA */
    .cta-final {
      background: var(--primary-deep-green);
      color: white;
      text-align: center;
      padding: 70px 0;
    }

    /* 页脚 */
    .footer {
      background: #0A2F24;
      color: #CCC;
      padding: 50px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }