/* roulang page: index */
:root {
      --primary-green: #0A9E5A;
      --primary-dark: #07834A;
      --deep-ink: #0F172A;
      --accent-gold: #F5B642;
      --bg-light: #F8FAFC;
      --text-body: #475569;
      --text-muted: #64748B;
      --white: #FFFFFF;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-lg: 20px;
      --transition: all 0.25s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, -apple-system, sans-serif;
      color: var(--deep-ink);
      background-color: var(--white);
      line-height: 1.6;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 图片通用 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      transition: var(--transition);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--deep-ink);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }
    .logo i {
      color: var(--primary-green);
      font-size: 2rem;
    }
    .logo span {
      color: var(--primary-green);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 0.95rem;
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary-green);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 10px rgba(10, 158, 90, 0.3);
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--deep-ink);
      background: none;
      border: none;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0F172A 0%, #1a2b3c 100%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.12;
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-text h1 .gold {
      color: var(--accent-gold);
    }
    .hero-text p {
      font-size: 1.2rem;
      color: #cbd5e1;
      margin-bottom: 2.2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      box-shadow: 0 8px 18px rgba(10, 158, 90, 0.4);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--accent-gold);
      color: #0F172A;
    }
    .hero-mockup {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .mockup-frame {
      background: rgba(255,255,255,0.08);
      border-radius: 32px;
      padding: 12px;
      backdrop-filter: blur(8px);
      box-shadow: 0 25px 50px rgba(0,0,0,0.4);
    }
    .mockup-frame img {
      border-radius: 22px;
      width: 280px;
      max-width: 100%;
      box-shadow: 0 0 0 2px rgba(255,255,255,0.1);
    }

    /* 通用标题 */
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--deep-ink);
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-top: 0.5rem;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .feature-card {
      background: var(--white);
      padding: 2.2rem 1.8rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 2.8rem;
      color: var(--primary-green);
      margin-bottom: 1.2rem;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    .feature-card p {
      color: var(--text-body);
    }

    /* 产品服务 图文交错 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 3.5rem;
      margin-bottom: 5rem;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .service-img img {
      border-radius: var(--radius-lg);
      transition: transform 0.3s;
    }
    .service-img:hover img {
      transform: scale(1.03);
    }
    .service-content {
      flex: 1;
    }
    .tag {
      display: inline-block;
      background: rgba(10, 158, 90, 0.1);
      color: var(--primary-green);
      padding: 4px 14px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.8rem;
      margin-bottom: 1rem;
    }
    .service-content h3 {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .check-list {
      list-style: none;
      margin-top: 1.2rem;
    }
    .check-list li {
      margin-bottom: 0.7rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text-body);
    }
    .check-list i {
      color: var(--primary-green);
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 0.3rem;
    }

    /* CTA 下载 */
    .cta-band {
      background: var(--primary-green);
      text-align: center;
      color: white;
      padding: 80px 0;
    }
    .cta-band h2 {
      font-size: 2.4rem;
      font-weight: 700;
    }
    .cta-band p {
      color: rgba(255,255,255,0.85);
      margin: 1rem 0 2rem;
    }
    .download-btns {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      flex-wrap: wrap;
    }
    .btn-download {
      background: var(--deep-ink);
      color: white;
      padding: 14px 30px;
      border-radius: 12px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1rem;
    }
    .btn-download i {
      color: var(--accent-gold);
    }
    .qr-placeholder {
      margin-top: 2rem;
      display: inline-block;
      background: white;
      padding: 12px;
      border-radius: 16px;
    }
    .qr-code {
      width: 100px;
      height: 100px;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #0F172A;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--deep-ink);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-ink);
      color: #cbd5e1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 1rem;
    }
    .footer a {
      color: #94a3b8;
      display: block;
      margin-bottom: 0.5rem;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      margin-top: 3rem;
      text-align: center;
      color: #64748B;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.6rem;
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        padding: 1.5rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .features-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      section {
        padding: 70px 0;
      }
      .container {
        padding: 0 20px;
      }
    }