/* roulang page: index */
:root {
      --primary: #00B4A0;
      --primary-dark: #009b89;
      --secondary: #1A1C20;
      --accent: #FF6B3D;
      --gold: #D4AF37;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --text-white: #F9FAFB;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 20px rgba(0,0,0,0.06);
      --shadow-lg: 0 12px 28px rgba(0,180,160,0.12);
      --shadow-btn: 0 4px 12px rgba(0,180,160,0.4);
      --radius-md: 8px;
      --radius-lg: 16px;
      --transition: all 0.25s ease;
      --font-mont: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
      line-height: 1.3;
    }
    h3 {
      font-size: 1.25rem;
      line-height: 1.4;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      color: var(--secondary);
      display: inline-block;
      position: relative;
    }
    .section-title h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 0.75rem auto 0;
      border-radius: 4px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, input, textarea {
      font-family: inherit;
      outline: none;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.85rem 2rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      white-space: nowrap;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: 0 4px 10px rgba(255,107,61,0.3);
    }
    .btn-primary:hover {
      background-color: #e85d2b;
      box-shadow: 0 8px 18px rgba(255,107,61,0.5);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      background: white;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      box-shadow: var(--shadow-btn);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(6px);
      border-bottom: 1px solid var(--border-light);
      z-index: 999;
      padding: 0.9rem 0;
      transition: var(--transition);
    }
    .navbar.scrolled {
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.7rem;
      font-weight: 800;
      font-family: var(--font-mont);
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      font-size: 1.5rem;
      background: none;
      border: none;
      color: var(--secondary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.8rem;
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        opacity: 0;
        transition: 0.3s ease;
      }
      .nav-links.open {
        transform: translateY(0);
        opacity: 1;
      }
      .hamburger {
        display: block;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #f0fdf9 0%, #ffffff 90%);
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--secondary);
      margin-bottom: 1.2rem;
    }
    .dynamic-text {
      height: 2.8rem;
      font-size: 1.3rem;
      font-weight: 500;
      color: var(--primary);
      margin: 1.2rem 0 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      margin-top: 1.8rem;
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.4rem;
      }
      .hero {
        padding: 110px 0 50px;
      }
    }
    /* 优势 */
    .advantages {
      padding: 80px 0;
      background: var(--white);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2.5rem;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mont);
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--gold);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-main);
      margin-top: 0.5rem;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务卡片网格2x3 */
    .services {
      padding: 80px 0;
      background: var(--bg-light);
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .service-card:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .card-img {
      height: 200px;
      background: #eef2f0;
      overflow: hidden;
    }
    .card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .service-card:hover .card-img img {
      transform: scale(1.03);
    }
    .card-text {
      padding: 1.5rem;
    }
    .card-text h3 {
      color: var(--secondary);
      margin-bottom: 0.4rem;
    }
    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例 */
    .cases {
      padding: 80px 0;
      background: var(--white);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-left: 5px solid var(--primary);
      padding: 1.8rem;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-highlight {
      font-family: var(--font-mont);
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 流程 */
    .process {
      padding: 80px 0;
      background: var(--bg-light);
    }
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 28px;
      left: 2%;
      width: 96%;
      height: 3px;
      background: var(--primary);
      z-index: 0;
    }
    .step {
      text-align: center;
      z-index: 2;
      width: 22%;
      background: var(--bg-light);
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: white;
      border: 2px solid var(--primary);
      border-radius: 50%;
      margin: 0 auto 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .timeline {
        flex-direction: column;
        gap: 2rem;
      }
      .timeline::before {
        display: none;
      }
      .step {
        width: 100%;
      }
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--white);
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-btn {
      width: 100%;
      background: none;
      border: none;
      padding: 1.2rem 0;
      font-size: 1.15rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--secondary);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    /* CTA */
    .cta-dark {
      background: var(--secondary);
      color: white;
      padding: 70px 0;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      justify-content: center;
      margin-top: 2rem;
    }
    .cta-form input {
      padding: 0.9rem 1.2rem;
      border-radius: 30px;
      border: none;
      width: 220px;
    }
    footer {
      background: #111317;
      color: #b0b0b0;
      padding: 50px 0 20px;
    }