/* roulang page: index */
:root {
      --primary: #E33B1E;
      --primary-dark: #C5280F;
      --secondary-dark: #1A1A2E;
      --accent-gold: #F5A623;
      --bg-light: #FAFAFA;
      --text-main: #1A1A2E;
      --text-secondary: #5C5C6E;
      --white: #FFFFFF;
      --border-light: #E5E5EA;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(227, 59, 30, 0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --transition: 0.3s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      color: var(--text-main);
      background-color: var(--white);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: clamp(2.2rem, 5vw, 3.5rem);
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      margin-bottom: 1rem;
    }

    .section-padding {
      padding: 5rem 0;
    }

    @media (max-width: 768px) {
      .section-padding {
        padding: 3rem 0;
      }
    }

    /* 导航 */
    .navbar {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      padding: 0.8rem 0;
      transition: var(--transition);
      z-index: 1030;
    }

    .navbar.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: 0 8px 30px rgba(0,0,0,0.06);
    }

    .navbar-brand {
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.5px;
    }

    .navbar-brand span {
      color: var(--secondary-dark);
      font-weight: 700;
    }

    .nav-link {
      color: var(--text-main) !important;
      font-weight: 600;
      margin: 0 0.3rem;
      padding: 0.5rem 1rem !important;
      border-radius: 2rem;
      transition: var(--transition);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
      background: rgba(227, 59, 30, 0.06);
    }

    .btn-primary-cta {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 700;
      padding: 0.75rem 1.8rem;
      border-radius: var(--radius-pill);
      transition: var(--transition);
      letter-spacing: 0.5px;
    }

    .btn-primary-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 20px rgba(227, 59, 30, 0.3);
      color: white;
    }

    .navbar-toggler {
      border: none;
      color: var(--text-main);
    }

    .offcanvas {
      background: var(--secondary-dark);
      color: white;
    }

    .offcanvas .nav-link {
      color: rgba(255,255,255,0.85) !important;
      font-size: 1.3rem;
      margin: 0.5rem 0;
    }

    .offcanvas .btn-primary-cta {
      background: white;
      color: var(--primary);
    }

    /* Hero */
    .hero-section {
      min-height: 90vh;
      background: linear-gradient(135deg, rgba(227,59,30,0.82) 0%, rgba(26,26,46,0.9) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero-title {
      font-weight: 800;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      font-weight: 400;
    }

    /* 按钮系统 */
    .btn-outline-white {
      border: 2px solid white;
      color: white;
      background: transparent;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }

    .btn-outline-white:hover {
      background: white;
      color: var(--primary);
    }

    .btn-primary-solid {
      background: var(--primary);
      color: white;
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: var(--transition);
    }

    .btn-primary-solid:hover {
      background: var(--primary-dark);
      box-shadow: 0 10px 25px rgba(227,59,30,0.3);
    }

    /* 卡片 */
    .card-custom {
      background: white;
      border: none;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }

    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .icon-circle {
      width: 70px;
      height: 70px;
      background: rgba(227,59,30,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 2rem;
      margin-bottom: 1.5rem;
    }

    .service-img {
      border-radius: var(--radius-md);
      object-fit: cover;
      height: 280px;
      width: 100%;
    }

    .bg-dark-section {
      background: var(--secondary-dark);
      color: white;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    .faq-accordion .accordion-button {
      font-weight: 700;
      background: transparent;
      box-shadow: none;
      color: var(--text-main);
      font-size: 1.2rem;
      padding: 1.2rem 0;
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
    }

    .faq-accordion .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
    }

    .footer {
      background: var(--secondary-dark);
      color: rgba(255,255,255,0.7);
    }

    .footer a {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
    }

    .footer a:hover {
      color: var(--accent-gold);
    }

    .footer h5 {
      color: white;
      font-weight: 700;
    }