/* roulang page: index */
:root {
      --green-field: #1B7E3D;
      --deep-charcoal: #1E1E1E;
      --accent-orange: #FF5E13;
      --warm-white: #FAFAF5;
      --pure-white: #FFFFFF;
      --light-gray-bg: #F5F5F0;
      --text-main: #3A3A3A;
      --text-muted: #6B6B6B;
      --border-light: #E8E8E2;
      --shadow-sm: 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', 'Roboto', 'Segoe UI', system-ui, sans-serif;
      --section-gap: 100px;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--deep-charcoal);
      line-height: 1.3;
      margin-bottom: 0.5em;
    }

    h1 { font-size: 42px; }
    h2 { font-size: 32px; }
    h3 { font-size: 22px; }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-size: 16px;
      padding: 12px 28px;
      text-align: center;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      box-shadow: 0 4px 10px rgba(255,94,19,0.25);
    }
    .btn-primary:hover {
      background-color: #E04D0A;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(255,94,19,0.35);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--green-field);
      color: var(--green-field);
    }
    .btn-outline:hover {
      background-color: var(--green-field);
      color: white;
      border-color: var(--green-field);
    }

    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: var(--warm-white);
      transition: box-shadow 0.3s, background-color 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    #header.scrolled {
      background-color: var(--pure-white);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 26px;
      font-weight: 700;
      color: var(--deep-charcoal);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--green-field);
      font-size: 32px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.3s;
    }
    .nav-links a:hover {
      color: var(--green-field);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 28px;
      background: none;
      border: none;
      color: var(--deep-charcoal);
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(250,250,245,0.98);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 24px;
      font-weight: 600;
      color: var(--deep-charcoal);
    }

    /* Hero */
    #hero {
      padding: 60px 0 80px;
      background-color: var(--warm-white);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text h1 {
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 32px;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-orange);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 380px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-header h2 {
      margin-bottom: 12px;
    }
    .section-header p {
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--pure-white);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      border-left: 4px solid var(--accent-orange);
    }
    .card-icon {
      font-size: 36px;
      color: var(--green-field);
    }
    .pain-point {
      font-weight: 700;
      color: var(--accent-orange);
      font-size: 18px;
    }

    /* 成果数据深色区 */
    .dark-bg {
      background-color: var(--deep-charcoal);
      color: var(--warm-white);
    }
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-big {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #F5F5F0;
      border-radius: var(--border-radius-card);
      padding: 32px;
      position: relative;
    }
    .quote-icon {
      color: var(--accent-orange);
      font-size: 32px;
      opacity: 0.7;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-size: cover;
      background-position: center;
      margin-right: 12px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--deep-charcoal);
      text-align: center;
      padding: 80px 24px;
      border-radius: 24px;
    }

    /* 页脚 */
    footer {
      background: var(--deep-charcoal);
      color: #9B9B9B;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 34px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      .cards-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats-row { flex-direction: column; }
      section { padding: 60px 0; }
    }