/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary-deep-green: #0B3D2E;
      --accent-amber-gold: #D4A843;
      --accent-amber-dark: #B88D2E;
      --bg-warm-white: #F7F5F0;
      --bg-dark-charcoal: #1A1A1A;
      --text-charcoal: #1A1A1A;
      --text-dark-gray: #4A4A4A;
      --border-warm-gray: #E5E0D8;
      --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --container-max: 1280px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Helvetica Neue', system-ui, sans-serif;
      --radius-card: 12px;
      --radius-button: 8px;
      --transition-base: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-charcoal);
      background-color: #FFFFFF;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition-base);
      font-weight: 500;
    }

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

    /* 标题层级 */
    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--primary-deep-green);
    }

    h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      margin-bottom: 1.2rem;
      position: relative;
      display: inline-block;
    }

    h3 {
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 1.3rem;
    }

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      transition: box-shadow var(--transition-base), background var(--transition-base);
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
      border-bottom: 1px solid var(--border-warm-gray);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep-green);
      text-decoration: none;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-amber-gold);
      transform: rotate(45deg);
      border-radius: 4px;
      box-shadow: 0 2px 8px rgba(212, 168, 67, 0.3);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-charcoal);
      position: relative;
      padding: 0.25rem 0;
      transition: color var(--transition-base);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-amber-gold);
      transition: width var(--transition-base);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--primary-deep-green);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--accent-amber-gold);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(212, 168, 67, 0.25);
    }

    .btn-primary:hover {
      background: var(--accent-amber-dark);
      box-shadow: 0 6px 20px rgba(184, 141, 46, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep-green);
      color: var(--primary-deep-green);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
    }

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

    .btn-outline-white {
      border-color: #FFFFFF;
      color: #FFFFFF;
    }

    .btn-outline-white:hover {
      background: #FFFFFF;
      color: var(--primary-deep-green);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1001;
    }

    .hamburger span {
      width: 28px;
      height: 2.5px;
      background: var(--primary-deep-green);
      transition: all var(--transition-base);
      border-radius: 4px;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary-deep-green);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transition: right 0.4s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.2);
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-link {
        color: #FFFFFF;
        font-size: 1.4rem;
      }
      .hamburger {
        display: flex;
      }
      .header-inner .btn-primary {
        display: none;
      }
    }

    /* ----- 区块通用 ----- */
    section {
      padding: 5rem 0;
    }

    .section-header {
      margin-bottom: 3rem;
    }

    .bg-warm {
      background-color: var(--bg-warm-white);
    }

    .bg-dark {
      background-color: var(--bg-dark-charcoal);
    }

    /* ----- 首屏 Hero ----- */
    .hero {
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(11, 61, 46, 0.75) 0%, rgba(26, 26, 26, 0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: #FFFFFF;
      margin-top: 0;
      padding: 6rem 0 4rem;
    }

    .hero-content {
      max-width: 800px;
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      color: #FFFFFF;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.35rem;
      color: var(--accent-amber-gold);
      margin-bottom: 2.5rem;
      font-weight: 400;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      gap: 1.5rem;
      flex-wrap: wrap;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 2rem;
      color: rgba(255,255,255,0.8);
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-12px); }
      60% { transform: translateX(-50%) translateY(-6px); }
    }

    /* ----- 痛点卡片 不对称布局 ----- */
    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }

    .problem-card {
      background: #FFFFFF;
      border: 1px solid var(--border-warm-gray);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: all var(--transition-base);
      position: relative;
      border-left: 5px solid var(--accent-amber-gold);
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .problem-card:nth-child(1) { margin-top: 0; }
    .problem-card:nth-child(2) { margin-top: 1.8rem; }
    .problem-card:nth-child(3) { margin-top: 0.5rem; }

    .problem-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
      border-color: var(--accent-amber-gold);
    }

    .problem-icon {
      font-size: 2.2rem;
      color: var(--primary-deep-green);
    }

    /* 解决方案区 */
    .solution-row {
      display: flex;
      gap: 3rem;
      align-items: center;
    }

    .solution-left {
      flex: 0 0 38%;
    }

    .solution-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
    }

    .solution-item {
      display: flex;
      gap: 1.2rem;
      align-items: flex-start;
    }

    .solution-icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(11, 61, 46, 0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep-green);
      font-size: 1.2rem;
    }

    /* 成果数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }

    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent-amber-gold);
      font-family: var(--font-serif);
    }

    /* 证言区 */
    .testimonial-block {
      display: flex;
      gap: 3rem;
      align-items: center;
    }

    .testimonial-image {
      flex: 0 0 45%;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .testimonial-cards {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .testimonial-card {
      background: #FFFFFF;
      padding: 1.8rem;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-warm-gray);
      transition: all var(--transition-base);
    }

    .testimonial-card:hover {
      border-color: var(--accent-amber-gold);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-warm-gray);
    }

    .faq-question {
      background: rgba(247, 245, 240, 0.6);
      padding: 1.2rem 0.5rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      padding: 0 0.5rem;
      color: var(--text-dark-gray);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem 0.5rem;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      color: #CCCCCC;
    }

    @media (max-width: 1024px) {
      .problem-grid { grid-template-columns: repeat(2, 1fr); }
      .problem-card:nth-child(2) { margin-top: 0; }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .problem-grid, .stats-grid { grid-template-columns: 1fr; }
      .solution-row, .testimonial-block { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }