/* roulang page: index */
:root {
      --primary-deep: #1B5E3B;
      --primary-soft: #2E7D4B;
      --accent-coral: #E85D3F;
      --accent-dark: #D14A2E;
      --bg-warm: #F7F5F0;
      --bg-light: #EDEAE4;
      --card-white: #FFFFFF;
      --text-main: #1F2A1F;
      --text-muted: #5A645A;
      --text-light: #8A948A;
      --border-subtle: rgba(27, 94, 59, 0.08);
      --shadow-card: 0px 6px 24px rgba(27, 94, 59, 0.08);
      --shadow-hover: 0px 12px 32px rgba(27, 94, 59, 0.15);
      --radius-card: 20px;
      --radius-btn: 10px;
      --radius-sm: 10px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', 'PingFang SC', sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    h1, h2, h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
      color: #1A2E1A;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    p {
      color: var(--text-muted);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: conic-gradient(from 90deg at 50% 50%, var(--primary-deep) 90deg, var(--accent-coral) 90deg 180deg, #e0b354 180deg 270deg, #7a9eb1 270deg);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      color: white;
      font-weight: 700;
      font-size: 18px;
      box-shadow: 0 4px 10px rgba(27,94,59,0.25);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-weight: 500;
      color: #2B3B2B;
    }
    .nav-links a {
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-coral);
    }
    .btn-primary {
      background: var(--accent-coral);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 4px 12px rgba(232,93,63,0.25);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-dark);
      transform: translateX(2px);
      box-shadow: 0 6px 16px rgba(209,74,46,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--primary-deep);
      border-radius: 2px;
      transition: 0.2s;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 20% 20%, #FFFCF5 5%, #1B5E3B 95%);
      background-blend-mode: overlay;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text h1 {
      color: white;
      text-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin: 1.2rem 0 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      height: 450px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.25);
    }
    /* 板块通用 */
    .section {
      padding: 90px 0;
    }
    .section-dark {
      background: var(--primary-deep);
      color: white;
    }
    .section-light {
      background: var(--bg-light);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    /* 痛点区 */
    .pain-item {
      display: flex;
      align-items: flex-start;
      gap: 18px;
      padding: 24px 0;
      border-bottom: 2px solid #ddd5c5;
      transition: 0.2s;
    }
    .pain-item:hover {
      border-bottom-color: var(--accent-coral);
    }
    .pain-icon {
      font-size: 28px;
      color: var(--primary-deep);
    }
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 20px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: white;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .testimonial-card {
      background: white;
      border-radius: 20px;
      padding: 28px;
      border-left: 6px solid var(--accent-coral);
      box-shadow: 0 8px 22px rgba(0,0,0,0.04);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 14px;
      padding: 18px 22px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      display: none;
      margin-top: 14px;
      color: #444;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 页脚 */
    .footer {
      background: #0D2B1A;
      color: #bcc9b8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .testimonial-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero { padding: 100px 0 50px; }
    }
    @media (max-width: 480px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .stat-number { font-size: 40px; }
    }