/* roulang page: index */
:root {
      --primary-deep: #2C3E50;
      --primary-dark: #1A252F;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --gray-cool: #7F8C8D;
      --gray-light: #E0E0E0;
      --bg-page: #FAFAFA;
      --bg-white: #FFFFFF;
      --text-main: #1E2B38;
      --text-secondary: #5A6872;
      --text-on-dark: #F0F4F8;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --transition: all 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --container-max: 1200px;
      --section-gap: 90px;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      padding-top: 70px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      height: 70px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent);
      line-height: 1;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--primary-deep);
      font-size: 1rem;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--accent);
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 12px rgba(255, 107, 53, 0.2);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(229, 90, 43, 0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: var(--primary-deep);
      border-radius: 4px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #2C3E50 0%, #1A252F 100%);
      color: white;
      padding: 70px 0 80px;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }
    .hero-highlight {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #CBD5E1;
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(26,37,47,0.25);
    }

    /* 通用板块 */
    .section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--primary-deep);
    }
    .section-sub {
      color: var(--gray-cool);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* 数据横条 */
    .stats-bar {
      background: var(--bg-white);
      border-radius: 24px;
      padding: 32px 30px;
      display: flex;
      justify-content: space-around;
      box-shadow: var(--shadow-sm);
      margin-bottom: 3.5rem;
      flex-wrap: wrap;
      gap: 20px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-white);
      border-radius: var(--border-radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: #F2F5F9;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.8rem;
      margin-bottom: 1.4rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.7rem;
    }

    /* 优势列表 */
    .advantages-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .adv-item {
      display: flex;
      align-items: center;
      gap: 24px;
      background: var(--bg-white);
      padding: 20px 28px;
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
    }
    .adv-icon {
      font-size: 2rem;
      color: var(--accent);
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--bg-white);
      border-radius: var(--border-radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 20px 24px;
    }
    .case-metric {
      font-weight: 700;
      color: var(--accent);
      font-size: 1.8rem;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 30px;
    }
    .step {
      flex: 1;
      text-align: center;
      background: var(--bg-white);
      padding: 24px 16px;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-white);
      border-radius: 14px;
      margin-bottom: 14px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--accent);
      color: var(--primary-deep);
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 联系表单 */
    .contact-card {
      background: var(--bg-white);
      border-radius: 24px;
      padding: 36px;
      box-shadow: var(--shadow-sm);
      max-width: 700px;
      margin: 0 auto;
    }
    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #E0E0E0;
      border-radius: 8px;
      margin-bottom: 18px;
      transition: 0.2s;
      font-size: 1rem;
    }
    .form-input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(255,107,53,0.15);
    }

    /* Footer */
    .footer {
      background: #1A252F;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-image { min-height: 260px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-content h1 { font-size: 2.4rem; }
      .cards-grid, .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats-bar { flex-direction: column; }
      .section-title { font-size: 1.9rem; }
      .process-steps { flex-direction: column; }
    }