/* roulang page: index */
:root {
      --green: #0A7E3D;
      --green-dark: #065A2B;
      --gold: #D4AF37;
      --gold-light: #F5B041;
      --black-deep: #1A1A1A;
      --gray-snow: #F8F9FA;
      --white: #FFFFFF;
      --text-body: #4A4A4A;
      --text-heading: #1E1E1E;
      --border-light: #E9ECEF;
      --shadow-card: 0 12px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 18px 36px rgba(0,0,0,0.1);
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --transition: 0.3s ease;
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --padding-section: 80px 0;
      --padding-mobile: 40px 0;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 2.6rem;
      line-height: 1.3;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 4px;
      background: var(--gold);
      border-radius: 4px;
    }
    .section-title-center h2::after {
      left: 50%;
      transform: translateX(-50%);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      letter-spacing: 0.02em;
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: box-shadow 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.7rem;
      color: var(--text-heading);
      letter-spacing: -0.5px;
    }
    .logo i {
      color: var(--gold);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-links a {
      font-weight: 600;
      color: var(--text-heading);
      position: relative;
      font-size: 1rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--green);
      transition: 0.3s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--gold);
      color: #1A1A1A !important;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700;
      box-shadow: 0 4px 10px rgba(212,175,55,0.3);
    }
    .nav-cta:hover {
      background: var(--gold-light);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--text-heading);
    }
    /* 首屏 Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,126,61,0.08) 0%, rgba(212,175,55,0.05) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.7) 0%, rgba(26,26,26,0.2) 90%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
    }
    .hero h1 {
      font-size: clamp(3rem, 8vw, 4.5rem);
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 24px;
      color: #0A1F0A;
    }
    .hero .highlight {
      color: var(--green);
      background: linear-gradient(to right, var(--gold), var(--green));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero p {
      font-size: 1.3rem;
      margin-bottom: 36px;
      color: #2C3E2C;
      max-width: 550px;
      font-weight: 500;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--green);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      box-shadow: 0 8px 18px rgba(10,126,61,0.3);
    }
    .btn-primary:hover {
      background: var(--green-dark);
      transform: translateY(-3px);
    }
    .btn-outline {
      border: 2px solid var(--gold);
      color: #1A1A1A;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--gold);
      color: #111;
      transform: translateY(-3px);
    }
    /* 板块通用 */
    section {
      padding: var(--padding-section);
    }
    .section-title {
      margin-bottom: 56px;
    }
    /* 品牌介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 64px;
      align-items: center;
    }
    .about-image img {
      border-radius: 28px;
      box-shadow: var(--shadow-card);
    }
    .stats-row {
      display: flex;
      gap: 32px;
      margin-top: 36px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--green);
    }
    /* 服务 非对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 32px;
    }
    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--gold);
      margin-bottom: 18px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .link-arrow {
      margin-top: auto;
      color: var(--green);
      font-weight: 600;
    }
    /* 数据深色 */
    .stats-dark {
      background: var(--black-deep);
      color: white;
      padding: 70px 0;
      text-align: center;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
    }
    .big-number {
      font-size: 3.8rem;
      font-weight: 800;
      color: var(--gold);
    }
    /* 案例时间轴 */
    .timeline {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .timeline-item {
      display: grid;
      grid-template-columns: 120px 1fr;
      gap: 32px;
      align-items: start;
    }
    .year {
      font-weight: 800;
      color: var(--green);
      font-size: 1.4rem;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      display: flex;
    }
    .case-card img {
      width: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 24px;
    }
    /* FAQ */
    .faq-wrapper {
      display: grid;
      grid-template-columns: 200px 1fr;
      gap: 48px;
    }
    .faq-category button {
      display: block;
      background: none;
      border: none;
      padding: 10px 0;
      font-weight: 600;
      color: var(--text-body);
      cursor: pointer;
    }
    .faq-category button.active {
      color: var(--green);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--green) 0%, #0B5E2E 100%);
      color: white;
      text-align: center;
      border-radius: 32px;
      margin: 40px 32px;
      padding: 64px 24px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .about-grid, .services-grid {
        grid-template-columns: 1fr;
      }
      .timeline-item {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .faq-wrapper { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
    }