/* roulang page: index */
:root {
      --primary: #E8453A;
      --primary-dark: #c0392b;
      --secondary: #1A1D2E;
      --gradient-start: #E8453A;
      --gradient-end: #FF7B42;
      --bg-light: #F5F6FA;
      --card-bg: #FFFFFF;
      --text-main: #1A1D2E;
      --text-muted: #5A5F6E;
      --border-light: #E8EAEF;
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 40px;
      --shadow-sm: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.08);
      --transition: all 0.25s ease;
      --font-h1: 700 48px/1.2 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui;
      --font-h2: 700 36px/1.3 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui;
      --font-h3: 600 22px/1.4 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui;
      --font-body: 400 16px/1.7 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui;
      --font-small: 400 14px/1.5 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font: var(--font-body);
      color: var(--text-main);
      background-color: var(--bg-light);
      margin: 0;
      letter-spacing: 0.01em;
      scroll-behavior: smooth;
    }

    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: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 自定义导航悬浮胶囊 */
    .custom-navbar {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: 90%;
      max-width: 1200px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 60px;
      padding: 10px 28px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: box-shadow 0.3s;
    }

    .custom-navbar.scrolled {
      box-shadow: 0 10px 30px rgba(0,0,0,0.06);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .navbar-brand i {
      font-size: 24px;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--secondary);
      position: relative;
      padding: 6px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta-btn {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      border: none;
      color: white;
      padding: 10px 22px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.3px;
      transition: 0.25s;
      box-shadow: 0 8px 18px rgba(232,69,58,0.2);
      white-space: nowrap;
    }

    .nav-cta-btn:hover {
      background: linear-gradient(155deg, var(--gradient-start), var(--gradient-end));
      box-shadow: 0 12px 24px rgba(232,69,58,0.3);
      transform: translateY(-1px);
      color: white;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--secondary);
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 30% 30%, rgba(232,69,58,0.02) 0%, transparent 70%);
      position: relative;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
    }

    .hero-right img {
      border-radius: 24px;
      box-shadow: 0 24px 50px rgba(0,0,0,0.06);
      animation: float 5s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }

    .hero-title {
      font: var(--font-h1);
      color: var(--secondary);
      margin-bottom: 22px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-badge-group {
      display: flex;
      gap: 14px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }

    .badge-pill {
      background: rgba(232,69,58,0.08);
      color: var(--primary);
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.2px;
    }

    .btn-primary-gradient {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 16px;
      transition: 0.25s;
      box-shadow: 0 10px 24px rgba(232,69,58,0.25);
      display: inline-block;
    }

    .btn-primary-gradient:hover {
      background: linear-gradient(150deg, var(--gradient-start), var(--gradient-end));
      box-shadow: 0 14px 30px rgba(232,69,58,0.35);
      color: white;
      transform: translateY(-2px);
    }

    .btn-outline-primary {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      padding: 12px 30px;
      border-radius: 40px;
      font-weight: 600;
      transition: 0.2s;
      margin-left: 16px;
    }

    .btn-outline-primary:hover {
      background: rgba(232,69,58,0.05);
      color: var(--primary);
    }

    /* 通用板块 */
    .section-block {
      padding: 90px 0;
    }

    .section-title {
      font: var(--font-h2);
      color: var(--secondary);
      margin-bottom: 18px;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-muted);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 50px;
      font-size: 17px;
    }

    /* 优势卡片 */
    .strength-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .strength-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .strength-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .strength-icon {
      font-size: 42px;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .strength-badge {
      background: rgba(232,69,58,0.1);
      color: var(--primary);
      border-radius: 40px;
      padding: 4px 14px;
      font-weight: 600;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 14px;
    }

    /* 服务卡片 错落设计 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: white;
      border-radius: 20px;
      padding: 32px 28px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:nth-child(odd) {
      margin-top: 18px;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .service-icon {
      font-size: 44px;
      color: var(--primary);
    }

    .service-arrow {
      color: var(--primary);
      font-weight: 600;
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    /* 案例瀑布 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .case-body {
      padding: 20px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border-radius: 16px !important;
      padding: 18px 24px;
      margin-bottom: 10px;
      border: 1px solid var(--border-light);
    }

    .accordion-button:not(.collapsed) {
      background-color: #FFF5F4;
      color: var(--primary);
      box-shadow: none;
    }

    .accordion-body {
      background: #FFF9F8;
      border-radius: 0 0 16px 16px;
    }

    /* 联系表单 */
    .form-control {
      border-radius: 12px;
      border: 1px solid var(--border-light);
      padding: 14px 18px;
      transition: 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(232,69,58,0.1);
    }

    .contact-info i {
      color: var(--primary);
      width: 24px;
    }

    /* Footer */
    .footer-dark {
      background: #1A1D2E;
      color: #B0B3C1;
      padding: 60px 0 30px;
    }

    .footer-dark a {
      color: #B0B3C1;
    }

    .footer-dark a:hover {
      color: var(--primary);
    }

    @media (max-width: 992px) {
      .hero-grid {
        flex-direction: column;
      }
      .service-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .masonry-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .strength-grid,
      .service-grid,
      .masonry-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 36px;
      }
    }