/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary: #0B3D35;
      --primary-deep: #0B2A25;
      --primary-light: #0F5A4A;
      --accent: #C8A96E;
      --accent-dark: #B8944F;
      --bg-warm: #FAFAF7;
      --bg-light-gray: #F0F4F2;
      --gray-border: rgba(11, 61, 53, 0.06);
      --gray-text: #666666;
      --gray-light: #B0C4C1;
      --text-dark: #1a1a1a;
      --text-mid: #333333;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(11, 61, 53, 0.06);
      --shadow-md: 0 12px 32px rgba(11, 61, 53, 0.10);
      --shadow-glow: 0 0 20px rgba(200, 169, 110, 0.4);
      --radius-card: 24px;
      --radius-large: 28px;
      --radius-btn: 50px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', 'DM Sans', 'Noto Sans SC', sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-mid);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }
    h1, h2, h3 {
      font-family: var(--font-serif);
      color: var(--primary);
      font-weight: 700;
    }
    h1 {
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      line-height: 1.15;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: clamp(2rem, 3.5vw, 2.5rem);
      font-weight: 650;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--accent);
      letter-spacing: 0.5px;
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }
    .section-tag::before {
      content: '';
      display: inline-block;
      width: 24px;
      height: 2px;
      background: var(--accent);
      border-radius: 4px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent), var(--accent-dark));
      color: var(--primary-deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 6px 18px rgba(200, 169, 110, 0.25);
      border: none;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: var(--shadow-glow);
      color: var(--primary);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: 1.5px solid var(--primary);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: rgba(11, 61, 53, 0.05);
      border-width: 2px;
      transform: scale(1.02);
    }
    /* 导航栏 */
    .nav-bar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(250, 250, 247, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--gray-border);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      font-size: 1.8rem;
      font-weight: 400;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #555;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 4px;
    }
    /* 首屏 Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(11,61,53,0.03) 0%, rgba(200,169,110,0.06) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-shape {
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: radial-gradient(circle at 70% 30%, rgba(200,169,110,0.15) 0%, rgba(11,61,53,0.05) 80%);
      clip-path: polygon(15% 0, 100% 0, 100% 100%, 0% 100%);
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      position: relative;
      z-index: 2;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-text h1 {
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--gray-text);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-badges {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      flex: 1 1 45%;
    }
    .badge-item {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 20px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(11,61,53,0.05);
    }
    .badge-number {
      font-family: var(--font-number);
      font-size: 2.2rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent), #B8944F);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .badge-label {
      font-size: 0.8rem;
      color: #4a4a4a;
      font-weight: 500;
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .bg-alternate {
      background-color: var(--bg-light-gray);
    }
    /* 核心优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--gray-border);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-number {
      font-family: var(--font-number);
      font-size: 3.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0B3D35, #0F5A4A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1;
    }
    .feature-title {
      font-size: 1.5rem;
      margin: 12px 0 10px;
    }
    .feature-desc {
      color: var(--gray-text);
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .feature-line {
      width: 40px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }
    /* 服务矩阵交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text {
      flex: 1;
    }
    .service-text h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
    .service-list {
      list-style: none;
      margin: 1.2rem 0;
    }
    .service-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      font-size: 1rem;
    }
    .service-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      flex-shrink: 0;
    }
    .service-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 12px 28px rgba(0,0,0,0.04);
      background: linear-gradient(135deg, #0B3D35, #C8A96E);
      aspect-ratio: 4/3;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    /* 场景卡 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      border-radius: var(--radius-large);
      padding: 32px 24px;
      color: white;
      height: 320px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      transition: var(--transition);
      background-size: cover;
    }
    .scenario-card:nth-child(1) { background: linear-gradient(135deg, #0B3D35, #0B2A25); }
    .scenario-card:nth-child(2) { background: linear-gradient(135deg, #0F5A4A, #0B3D35); }
    .scenario-card:nth-child(3) { background: linear-gradient(135deg, #B8944F, #7A5F3A); }
    .scenario-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 36px rgba(0,0,0,0.2);
    }
    .scenario-tags {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .scenario-tag {
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(4px);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.75rem;
    }
    /* 案例区 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: 16px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }
    .case-card:hover {
      border-left-width: 8px;
      box-shadow: var(--shadow-md);
    }
    .case-number {
      font-family: var(--font-number);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary);
    }
    .case-quote {
      font-style: italic;
      color: #4a4a4a;
      margin: 10px 0;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 20px;
      color: #555;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0B3D35, #0F5A4A);
      text-align: center;
      padding: 90px 20px;
    }
    .cta-section h2 {
      color: white;
      justify-content: center;
    }
    /* 页脚 */
    .footer {
      background: #0B2A25;
      color: #B0C4C1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .scenarios-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content { flex-direction: column; }
      .hero-badges { grid-template-columns: repeat(2,1fr); width: 100%; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }