/* roulang page: index */
:root {
      --primary-red: #E63946;
      --primary-dark: #1D1D1D;
      --accent-gold: #F4A261;
      --deep-blue: #2A3B4C;
      --soft-bg: #F4F4F6;
      --white: #FFFFFF;
      --text-dark: #1D1D1D;
      --text-muted: #6C757D;
      --border-light: #e0e0e0;
      --radius-card: 12px;
      --radius-btn: 30px;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-hover: 0 14px 30px rgba(0,0,0,0.12);
      --transition-base: all 0.25s ease-in-out;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', system-ui, -apple-system, sans-serif;
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, .nav-link, .btn {
      font-weight: 700;
    }
    
    a {
      text-decoration: none;
      transition: var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航栏 */
    .navbar {
      background: rgba(29, 29, 29, 0.85);
      backdrop-filter: blur(12px);
      padding: 0.8rem 0;
      min-height: 75px;
      transition: background 0.3s;
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }
    .navbar .navbar-brand {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      color: var(--white) !important;
      display: flex;
      align-items: center;
    }
    .navbar .navbar-brand span {
      color: var(--accent-gold);
    }
    .navbar-nav .nav-link {
      color: rgba(255,255,255,0.85) !important;
      font-weight: 600;
      margin: 0 0.5rem;
      padding: 0.5rem 1rem !important;
      border-radius: 30px;
      transition: var(--transition-base);
      position: relative;
    }
    .navbar-nav .nav-link.active,
    .navbar-nav .nav-link:hover {
      color: var(--white) !important;
      background: rgba(230, 57, 70, 0.3);
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 20%;
      width: 60%;
      height: 3px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .btn-nav-cta {
      background: var(--primary-red);
      color: var(--white) !important;
      border-radius: 30px;
      padding: 0.5rem 1.8rem !important;
      font-weight: 700;
      margin-left: 0.8rem;
      border: none;
      transition: var(--transition-base);
    }
    .btn-nav-cta:hover {
      background: #c5303c;
      transform: scale(1.02);
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.5);
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    /* Hero 区域 */
    .hero-section {
      background: linear-gradient(135deg, #1D1D1D 0%, #2A3B4C 100%);
      position: relative;
      overflow: hidden;
      padding: 5rem 0 5rem;
      color: white;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-title span {
      color: var(--accent-gold);
      border-bottom: 4px solid var(--primary-red);
    }
    .hero-lead {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.2rem;
      max-width: 550px;
    }
    .btn-primary-custom {
      background: var(--primary-red);
      border: none;
      border-radius: 30px;
      padding: 0.75rem 2.5rem;
      font-weight: 700;
      color: white;
      transition: var(--transition-base);
      box-shadow: 0 8px 16px rgba(230,57,70,0.4);
    }
    .btn-primary-custom:hover {
      background: #c5303c;
      transform: translateY(-2px);
      box-shadow: 0 12px 22px rgba(230,57,70,0.5);
      color: white;
    }
    .btn-outline-light-custom {
      border: 2px solid white;
      background: transparent;
      border-radius: 30px;
      padding: 0.75rem 2.5rem;
      font-weight: 700;
      color: white;
      transition: var(--transition-base);
    }
    .btn-outline-light-custom:hover {
      background: white;
      color: var(--primary-dark);
      border-color: white;
    }
    .hero-image-col img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 2px solid rgba(255,255,255,0.15);
    }
    
    /* 通用板块 */
    .section-padding {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 1rem;
      color: var(--primary-dark);
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--primary-red);
      border-radius: 2px;
    }
    .text-accent {
      color: var(--primary-red);
    }
    
    /* 优势卡片 */
    .advantage-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      display: flex;
      align-items: flex-start;
      gap: 1.5rem;
      border: 1px solid #f0f0f0;
      height: 100%;
    }
    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-red);
    }
    .advantage-icon {
      font-size: 2.4rem;
      color: var(--primary-red);
      background: #fde8ea;
      padding: 0.8rem;
      border-radius: 16px;
    }
    .advantage-text h4 {
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    
    /* 服务卡片瀑布流 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      margin-bottom: 2rem;
      border: 1px solid #f0f0f0;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 220px;
      object-fit: cover;
      width: 100%;
    }
    .service-body {
      padding: 1.5rem;
    }
    .badge-custom {
      background: var(--accent-gold);
      color: #1D1D1D;
      font-weight: 600;
      border-radius: 20px;
      padding: 0.2rem 1rem;
      font-size: 0.8rem;
    }
    
    /* 数据卡片 */
    .stat-card {
      background: var(--soft-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      text-align: center;
      transition: var(--transition-base);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-red);
    }
    
    /* FAQ 手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: #fde8ea;
      color: var(--primary-dark);
      font-weight: 700;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary-red);
      box-shadow: 0 0 0 0.2rem rgba(230,57,70,0.2);
    }
    .accordion-item {
      border: 1px solid #ddd;
      border-radius: 8px;
      margin-bottom: 1rem;
    }
    
    /* CTA 区块 */
    .cta-block {
      background: linear-gradient(135deg, #1D1D1D, #2A3B4C);
      border-radius: 16px;
      padding: 4rem 2rem;
    }
    
    /* 页脚 */
    footer {
      background: #1D1D1D;
      color: #ccc;
    }
    footer a {
      color: #ccc;
    }
    footer a:hover {
      color: var(--primary-red);
    }
    .footer-logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
    }
    
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .hero-section {
        padding: 3rem 0;
        text-align: center;
      }
      .hero-image-col {
        margin-top: 2rem;
      }
      .advantage-card {
        flex-direction: column;
        align-items: flex-start;
      }
      .section-title {
        font-size: 1.9rem;
      }
    }