/* roulang page: index */
/* ----- 设计变量 & 基础重置 ----- */
    :root {
      --primary: #8B7D3C;       /* 深橄榄金 */
      --primary-soft: rgba(139, 125, 60, 0.18);
      --secondary: #1A2421;     /* 午夜墨绿 */
      --accent: #F7F4EB;        /* 香槟白 */
      --cta: #D98A44;           /* 琥珀橙 */
      --white: #FFFFFF;
      --text-dark: #2E2E2E;
      --text-body: #4A4A4A;
      --text-muted: #6B6B6B;
      --border-light: rgba(26, 36, 33, 0.08);
      --shadow-card: 0 8px 28px rgba(26, 36, 33, 0.06);
      --shadow-hover: 0 24px 42px rgba(139, 125, 60, 0.15);
      --radius-md: 12px;
      --radius-pill: 50px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "Inter", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--accent);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    
    /* 容器 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    /* 区块间距 */
    section {
      padding: 5rem 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 3.5rem 0;
      }
    }
    
    /* ----- 导航栏：悬浮胶囊 ----- */
    .navbar {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 2rem);
      max-width: 1100px;
      background: rgba(26, 36, 33, 0.88);
      backdrop-filter: blur(15px);
      -webkit-backdrop-filter: blur(15px);
      border-radius: var(--radius-pill);
      padding: 0.8rem 2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      box-shadow: 0 12px 28px rgba(0,0,0,0.1);
      border: 1px solid rgba(255,255,255,0.08);
    }
    
    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--cta);
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      color: #EAE6D8;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cta);
      transition: 0.25s ease;
    }
    .nav-links a:hover {
      color: white;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-cta-nav {
      background: var(--cta);
      color: white;
      padding: 0.65rem 1.8rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      transition: 0.3s;
      box-shadow: 0 6px 14px rgba(217, 138, 68, 0.3);
    }
    .btn-cta-nav:hover {
      background: #c47a3a;
      box-shadow: 0 8px 20px rgba(217, 138, 68, 0.5);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--accent);
      cursor: pointer;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .navbar {
        padding: 0.8rem 1.5rem;
      }
    }
    
    /* 移动端抽屉菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(26, 36, 33, 0.96);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      z-index: 999;
      transform: translateY(-100%);
      transition: 0.4s ease;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      color: var(--accent);
      font-size: 1.8rem;
      font-weight: 500;
    }
    .mobile-menu .close-menu {
      position: absolute;
      top: 2rem;
      right: 2rem;
      font-size: 2.2rem;
      color: white;
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      background: var(--secondary);
      background-image: radial-gradient(circle at 30% 40%, rgba(139,125,60,0.25) 0%, transparent 60%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 7;
      color: white;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-size: clamp(3rem, 8vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.15;
      color: var(--accent);
      margin-bottom: 1.5rem;
    }
    .hero-text h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #D9D0B5;
      margin-bottom: 2.5rem;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 1.5rem;
      align-items: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cta);
      color: white;
      padding: 1rem 2.5rem;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 12px 24px rgba(217,138,68,0.4);
    }
    .btn-underline {
      color: var(--accent);
      font-weight: 500;
      border-bottom: 2px solid var(--primary);
      padding-bottom: 4px;
    }
    .hero-visual {
      flex: 5;
      position: relative;
    }
    .hero-img {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 350px;
      width: 100%;
      box-shadow: 0 30px 40px rgba(0,0,0,0.4);
      border: 1px solid rgba(255,255,255,0.1);
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-text {
        order: 2;
      }
      .hero-visual {
        order: 1;
      }
    }
    
    /* 区块标题 */
    .section-title {
      font-family: var(--font-heading);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 0.75rem;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 3rem;
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: white;
      padding: 2.2rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      text-align: left;
      transition: var(--transition-smooth);
      border-left: 4px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-left: 4px solid var(--primary);
    }
    .service-card i {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 数据优势 */
    .stats-section {
      background: var(--secondary);
      color: white;
      padding: 4rem 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--cta);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .case-card {
      background: white;
      border-radius: 18px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 1.8rem;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 流程 */
    .process-flow {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 1rem;
      padding: 1.2rem 1.8rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
      text-align: center;
      padding: 4rem 1rem;
      color: white;
    }
    
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #CBC3A8;
      padding: 3rem 0 1.5rem;
    }