/* roulang page: index */
:root {
      --primary: #1A7A2E;
      --primary-dark: #15391F;
      --accent: #C8A24A;
      --charcoal: #1E1E1E;
      --warm-bg: #F5F0E8;
      --case-bg: #F0EDE6;
      --text-main: #1E1E1E;
      --text-secondary: #4A4A4A;
      --text-muted: #757575;
      --border-light: #E0DCD3;
      --white: #FFFFFF;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 70px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      padding: 0 20px;
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      height: 64px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L15 9H22L16 14L18 21L12 17L6 21L8 14L2 9H9L12 2Z"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L15 9H22L16 14L18 21L12 17L6 21L8 14L2 9H9L12 2Z"/></svg>') center/contain no-repeat;
      background: var(--primary);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      font-size: 0.95rem;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 0.5rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border-bottom: none !important;
      box-shadow: 0 2px 6px rgba(200,162,74,0.3);
    }
    .nav-cta:hover {
      background: #dab75a;
      color: white !important;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--charcoal);
      border-radius: 2px;
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 1.5rem 0;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        gap: 1rem;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-top: 0.5rem;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(0deg, rgba(0,0,0,0.55) 0%, rgba(0,0,0,0.2) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 64px;
    }
    .hero-content {
      max-width: 700px;
      padding: 2rem 0;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: white;
    }
    .hero .lead {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 2rem;
      line-height: 1.6;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #1E1E1E;
      font-weight: 700;
      padding: 0.75rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(200,162,74,0.4);
    }
    .btn-primary:hover {
      background: #e0b85c;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(200,162,74,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2rem;
      }
      .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
      }
    }
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--charcoal);
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 24px;
      height: 3px;
      background: var(--accent);
      border-radius: 2px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 3rem;
      font-size: 1rem;
    }
    /* 核心价值不对称 */
    .value-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      align-items: center;
    }
    .value-badge {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2.5rem;
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .big-number {
      font-size: 4.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1;
    }
    .value-items {
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
    }
    .value-item {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }
    .value-icon {
      font-size: 1.6rem;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .value-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 产品卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .product-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      height: 200px;
      background: #e9e3d5;
      position: relative;
    }
    .card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .card-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(26,122,46,0.9);
      color: white;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
    }
    .card-body {
      padding: 1.5rem;
    }
    .card-body h3 {
      font-size: 1.3rem;
      margin-bottom: 0.5rem;
    }
    .feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 0.4rem;
      margin: 0.8rem 0 1rem;
    }
    .tag {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.15rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .product-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .product-grid { grid-template-columns: 1fr; }
    }
    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 1.2rem;
      box-shadow: var(--shadow-card);
    }
    .scenario-img {
      height: 140px;
      background: #ddd6cb;
      border-radius: 8px;
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .scenario-grid { grid-template-columns: 1fr; }
    }
    /* 案例卡片 */
    .case-bg {
      background: var(--case-bg);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 1.8rem;
      display: flex;
      gap: 1.5rem;
      align-items: center;
    }
    .case-avatar {
      width: 64px;
      height: 64px;
      background: var(--charcoal);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
    }
    .case-stat {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .case-grid { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 0.5rem;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-weight: 700;
      font-size: 1.1rem;
      padding: 1rem 0;
      display: flex;
      justify-content: space-between;
      color: var(--charcoal);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      line-height: 1.7;
      padding: 0 0 0 1rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1rem;
    }
    /* CTA 尾屏 */
    .cta-section {
      background: var(--primary-dark);
      color: white;
      text-align: center;
    }
    .cta-section h2 {
      font-size: 2.4rem;
      font-weight: 700;
    }
    .btn-gold {
      background: var(--accent);
      color: #1E1E1E;
      font-weight: 700;
      padding: 0.9rem 2.8rem;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      border: none;
      margin-top: 1.5rem;
    }
    /* 页脚 */
    .footer {
      background: var(--charcoal);
      color: #B0B0B0;
      padding: 3rem 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    .footer a:hover { color: var(--primary); }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 70px 0; }
    }