/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-dark: #c43d12;
      --secondary: #1A1A2E;
      --neon: #FF6B35;
      --bg-warm: #F9F4EF;
      --card-bg: #FFFFFF;
      --card-warm: #FFF8F3;
      --text-dark: #1A1A2E;
      --text-muted: #5C5C5C;
      --text-light: #BBBBBB;
      --border-light: #EEEEEE;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-btn: 50px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.8;
      margin: 0;
      padding-top: 76px;
      font-weight: 400;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-dark);
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--neon);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 60px 0;
      }
      body {
        padding-top: 66px;
      }
    }
    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 霓虹导航 */
    .navbar {
      background-color: var(--secondary);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      padding: 0.8rem 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: #ffffff;
      display: flex;
      align-items: center;
    }
    .navbar-brand span:first-child {
      color: #ffffff;
    }
    .navbar-brand span:last-child {
      color: var(--neon);
    }
    .navbar-brand:hover {
      color: #ffffff;
    }
    .navbar-nav .nav-link {
      color: #CCCCCC !important;
      font-weight: 500;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem !important;
      position: relative;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: #ffffff !important;
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0.8rem;
      right: 0.8rem;
      height: 3px;
      background-color: var(--neon);
      border-radius: 2px;
    }
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      font-size: 0.9rem;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 12px rgba(233,78,27,0.3);
    }
    .btn-primary-custom:hover {
      background-color: var(--neon);
      color: white;
      box-shadow: 0 0 18px rgba(255,107,53,0.5);
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    /* Hero 双栏杂志 */
    .hero {
      background-color: var(--bg-warm);
      background-image: radial-gradient(circle at 20% 30%, rgba(255,107,53,0.03) 0%, transparent 40%);
      padding: 80px 0 90px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text-dark);
    }
    .hero .lead {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin: 1.5rem 0 2rem;
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(233,78,27,0.15);
      background: linear-gradient(135deg, #FF6B35 0%, #E94E1B 100%);
    }
    .hero-image-wrapper img {
      mix-blend-mode: overlay;
      opacity: 0.9;
      width: 100%;
      height: auto;
      display: block;
    }
    .neon-glow {
      position: absolute;
      top: -15%;
      right: -10%;
      width: 180px;
      height: 180px;
      background: radial-gradient(circle, rgba(255,107,53,0.5) 0%, transparent 70%);
      border-radius: 50%;
      filter: blur(30px);
      z-index: 0;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero .lead {
        font-size: 1rem;
      }
      .hero-image-wrapper {
        margin-top: 2rem;
      }
    }
    /* 板块标题 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background-color: var(--neon);
      margin-top: 8px;
      border-radius: 2px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    /* 卡片系统 */
    .card-custom {
      background: var(--card-bg);
      border: none;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      padding: 2rem 1.5rem;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background-color: #FFF3EC;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--primary);
      font-size: 1.8rem;
      transition: var(--transition);
    }
    .card-custom:hover .icon-circle {
      background-color: var(--primary);
      color: white;
      box-shadow: 0 0 15px rgba(233,78,27,0.4);
      transform: scale(1.05);
    }
    .card-title {
      font-weight: 600;
      font-size: 1.3rem;
      margin-bottom: 0.5rem;
    }
    /* 产品瀑布流 */
    .product-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 30px;
      display: flex;
      flex-direction: row;
      transition: var(--transition);
    }
    .product-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .product-img {
      width: 45%;
      object-fit: cover;
      display: block;
    }
    .product-info {
      padding: 2rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .badge-neon {
      background: var(--neon);
      color: white;
      font-weight: 600;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 0.8rem;
      width: fit-content;
    }
    @media (max-width: 768px) {
      .product-card {
        flex-direction: column;
      }
      .product-img {
        width: 100%;
        height: 220px;
      }
      .product-card.reverse-mobile {
        flex-direction: column-reverse;
      }
    }
    /* 方案对比 */
    .compare-left {
      background: #F0F0F0;
      border-radius: var(--radius-lg) 0 0 var(--radius-lg);
      padding: 2.5rem;
      color: #444;
    }
    .compare-right {
      background: #FFF3EC;
      border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
      padding: 2.5rem;
      border-left: 4px solid var(--neon);
    }
    .compare-right h3 {
      color: var(--primary);
      border-bottom: 3px solid var(--neon);
      display: inline-block;
      padding-bottom: 4px;
    }
    .icon-cross {
      color: #c00;
      margin-right: 8px;
    }
    .icon-check {
      color: var(--neon);
      margin-right: 8px;
    }
    @media (max-width: 768px) {
      .compare-left, .compare-right {
        border-radius: var(--radius-lg);
        margin-bottom: 20px;
      }
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      color: var(--text-dark);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: #FFF8F3;
      color: var(--primary);
      border-left: 4px solid var(--neon);
      box-shadow: none;
    }
    .accordion-body {
      background: #FAFAFA;
      padding: 1.5rem;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--secondary);
      color: white;
      padding: 80px 0;
      text-align: center;
      border-radius: 0;
    }
    .cta-banner h2 {
      color: white;
      font-size: 2.5rem;
      font-weight: 700;
    }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #BBBBBB;
      padding: 60px 0 30px;
    }
    .footer a {
      color: #BBBBBB;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--neon);
    }
    .footer .social-icon {
      width: 40px;
      height: 40px;
      border: 1px solid #555;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      transition: var(--transition);
      color: #BBBBBB;
    }
    .footer .social-icon:hover {
      background: var(--neon);
      border-color: var(--neon);
      color: white;
    }
    .copyright {
      border-top: 1px solid #2a2a40;
      margin-top: 40px;
      padding-top: 20px;
      color: #777;
      font-size: 0.9rem;
    }