/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --ink-black: #1A1E1B;
      --energy-green: #2ECC71;
      --panda-white: #F5F6F0;
      --warm-stone: #E8E2D2;
      --bamboo-gray: #6B7B6D;
      --alert-orange: #F39C12;
      --card-shadow: 0 4px 20px rgba(26,30,27,0.06);
      --card-hover-shadow: 0 8px 30px rgba(26,30,27,0.12);
      --transition-base: 0.2s ease;
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
      background-color: var(--panda-white);
      color: var(--ink-black);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: var(--transition-base);
    }

    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    h1 { font-size: 48px; line-height: 56px; }
    h2 { font-size: 36px; line-height: 44px; }
    h3 { font-size: 22px; line-height: 30px; }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--energy-green);
      color: var(--ink-black);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
      display: inline-block;
      text-align: center;
      transition: all 0.2s ease;
      border: 2px solid transparent;
    }
    .btn-primary:hover {
      background-color: #27AE60;
      transform: scale(1.03);
      box-shadow: 0 10px 20px -10px rgba(46,204,113,0.4);
    }

    .btn-outline {
      background: transparent;
      color: var(--energy-green);
      border: 2px solid var(--energy-green);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--border-radius-btn);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: var(--energy-green);
      color: var(--ink-black);
      transform: translateY(-2px);
    }

    .btn-reverse {
      background-color: var(--ink-black);
      color: #fff;
      border: 2px solid var(--ink-black);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--border-radius-btn);
    }
    .btn-reverse:hover {
      background-color: #2d3330;
      border-color: #2d3330;
    }

    /* 卡片通用 */
    .card {
      background: #FFFFFF;
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      padding: 24px;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26,30,27,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background 0.3s;
      border-bottom: 1px solid rgba(245,246,240,0.1);
    }
    .site-header.scrolled {
      background: rgba(26,30,27,0.95);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--panda-white);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo i {
      font-size: 28px;
      color: var(--energy-green);
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-menu a {
      color: rgba(245,246,240,0.85);
      font-weight: 500;
      font-size: 16px;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--energy-green);
      border-bottom-color: var(--energy-green);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--panda-white);
      transition: 0.2s;
      display: block;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--ink-black);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
    }
    .mobile-menu a {
      color: var(--panda-white);
      font-size: 20px;
      font-weight: 500;
      display: block;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background: linear-gradient(180deg, rgba(26,30,27,0.4) 0%, rgba(26,30,27,0.85) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: var(--panda-white);
    }
    .hero-content {
      max-width: 700px;
    }
    .hero h1 {
      margin-bottom: 16px;
    }
    .hero .subtitle {
      font-size: 18px;
      opacity: 0.8;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      display: inline-block;
      position: relative;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 50%;
      transform: translateX(-50%);
      width: 48px;
      height: 3px;
      background: var(--energy-green);
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 48px 32px;
      text-align: center;
    }
    .pain-item i {
      font-size: 40px;
      color: var(--energy-green);
      margin-bottom: 16px;
    }
    .pain-item h3 {
      margin-bottom: 8px;
      font-size: 20px;
    }
    .pain-item p {
      color: var(--bamboo-gray);
    }

    /* 解决方案卡片 */
    .solutions-wrapper {
      background: var(--warm-stone);
      padding: 80px 0;
    }
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 16px;
    }
    .solution-tag {
      background: var(--energy-green);
      color: var(--ink-black);
      font-weight: 600;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 成果数据 */
    .results-section {
      background: var(--ink-black);
      color: var(--panda-white);
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 32px;
    }
    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--energy-green);
      line-height: 1;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #fff;
      border-left: 4px solid var(--energy-green);
      padding: 24px;
      border-radius: 0 12px 12px 0;
      font-style: italic;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      font-style: normal;
    }
    .testimonial-user img {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .faq-section {
      background: var(--warm-stone);
    }
    .accordion-item {
      background: #fff;
      border-radius: 10px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }
    .accordion-question {
      width: 100%;
      background: transparent;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 17px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--ink-black);
    }
    .accordion-answer {
      padding: 0 24px 20px;
      color: var(--bamboo-gray);
      display: none;
    }
    .accordion-item.active .accordion-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--energy-green);
      text-align: center;
      color: var(--ink-black);
    }
    .cta-section h2 {
      margin-bottom: 16px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--ink-black);
      color: var(--bamboo-gray);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 40px; line-height: 48px; }
      .solutions-grid, .testimonials-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.show { display: flex; }
      h1 { font-size: 32px; line-height: 40px; }
      h2 { font-size: 28px; }
      .pain-grid, .solutions-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .btn-primary, .btn-outline, .btn-reverse { width: 100%; max-width: 320px; margin: 0 auto; display: block; }
      .hero-actions { flex-direction: column; align-items: flex-start; }
      section { padding: 72px 0; }
    }
    @media (max-width: 520px) {
      .container { padding: 0 20px; }
      .stats-grid { flex-direction: column; }
    }