/* roulang page: index */
/* 基础重置与设计变量 */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --primary: #0A4D3C;
      --primary-dark: #073D2F;
      --accent: #F15A24;
      --accent-hover: #D94A1A;
      --soft-bg: #EAF4F0;
      --gray-dark: #1E1E1E;
      --gray-mid: #5A5A5A;
      --gray-light: #F5F5F5;
      --white: #FFFFFF;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.25s ease;
      --container: 1200px;
      --section-padding: 100px 20px;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-main);
      background: var(--gray-light);
      color: var(--gray-dark);
      line-height: 1.7;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: all var(--transition);
    }

    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航样式 - 白底平台导航 */
    .site-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
      backdrop-filter: blur(8px);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: bold;
      position: relative;
    }
    .logo-icon::after {
      content: "⚡";
      font-size: 16px;
      filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3));
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--gray-dark);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 20px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none !important;
      margin-left: 10px;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      color: white !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
      z-index: 110;
    }
    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
    }

    /* 区块通用 */
    section {
      padding: var(--section-padding);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--gray-dark);
      margin-bottom: 16px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 56px;
      height: 4px;
      background: var(--accent);
      margin-top: 12px;
      border-radius: 2px;
    }
    .section-title.center {
      text-align: center;
    }
    .section-title.center::after {
      margin-left: auto;
      margin-right: auto;
    }
    .section-desc {
      font-size: 1.15rem;
      color: var(--gray-mid);
      max-width: 680px;
      margin: 0 auto 40px;
      text-align: center;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 1.05rem;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(10,77,60,0.25);
      display: inline-flex;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(7,61,47,0.35);
    }
    .btn-outline {
      border: 2px solid var(--accent);
      color: var(--accent);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--accent);
      color: white;
      transform: scale(1.02);
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(7,61,47,0.75) 0%, rgba(10,77,60,0.85) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      color: white;
      padding-top: 80px;
    }
    .hero-content {
      max-width: 720px;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 600px;
    }
    .data-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
      pointer-events: none;
      z-index: 1;
    }
    .particle {
      position: absolute;
      background: rgba(255,255,255,0.2);
      border-radius: 50%;
      animation: float 6s infinite;
    }
    @keyframes float {
      0% { transform: translateY(0) scale(1); opacity: 0.4; }
      50% { opacity: 0.8; transform: translateY(-30px) scale(1.2); }
      100% { transform: translateY(0) scale(1); opacity: 0.3; }
    }

    /* 痛点区 */
    .pain-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
      max-width: 800px;
      margin: 0 auto;
    }
    .pain-item {
      display: flex;
      gap: 20px;
      align-items: flex-start;
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--accent);
      min-width: 44px;
    }

    /* 解决方案网格 */
    .grid-2x2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 0;
    }
    .card-text {
      padding: 24px;
    }
    .card-text h3 {
      font-size: 1.4rem;
      margin-bottom: 10px;
    }

    /* 成果数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      font-size: 1rem;
      color: var(--gray-mid);
      margin-top: 6px;
    }

    /* 证言 */
    .testimonial-cards {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .testimonial {
      background: var(--soft-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      flex: 1 1 280px;
      max-width: 360px;
      border-left: 5px solid var(--accent);
    }

    /* FAQ */
    .faq-item {
      background: var(--soft-bg);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.1rem;
      background: transparent;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray-mid);
      display: none;
      background: white;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    #cta {
      background: linear-gradient(120deg, var(--primary) 0%, #0B5E4A 100%);
      color: white;
      text-align: center;
    }

    /* Footer */
    .site-footer {
      background: var(--primary-dark);
      color: rgba(255,255,255,0.85);
      padding: 50px 20px 25px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }
    .footer-links a {
      display: block;
      margin: 8px 0;
      color: rgba(255,255,255,0.7);
    }
    .footer-links a:hover { color: var(--accent); }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        position: fixed; top: 64px; left: 0; width: 100%; background: white; flex-direction: column; padding: 20px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1); display: none; z-index: 99;
      }
      .mobile-menu.open { display: flex; }
      .grid-2x2 { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2rem; }
      .section-title { font-size: 1.8rem; }
    }