/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-glow: #FFB800;
      --secondary-bg: #1A1A2E;
      --dark-surface: #0D0D1A;
      --text-primary: #F0F0F0;
      --text-muted: #A0A0B0;
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-hover-border: rgba(255, 184, 0, 0.25);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', 'Helvetica Neue', sans-serif;
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glass-blur: blur(20px);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--secondary-bg);
      color: var(--text-primary);
      font-family: var(--font-heading);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: var(--dark-surface);
    }
    ::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 3px;
    }

    a {
      text-decoration: none;
      color: var(--text-muted);
      transition: color 0.2s;
    }
    a:hover {
      color: var(--primary-glow);
    }

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

    /* 容器 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(26, 26, 46, 0.75);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      height: 72px;
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-primary);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 8px 0;
      transition: 0.2s;
      letter-spacing: 0.5px;
    }
    .nav-links a.active,
    .nav-links a:hover {
      color: var(--primary-glow);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 6px;
      height: 6px;
      background: var(--primary-glow);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-glow);
    }
    .btn-nav {
      background: var(--primary);
      border: none;
      color: white;
      padding: 8px 20px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: 0.25s;
    }
    .btn-nav:hover {
      box-shadow: 0 0 18px rgba(255,184,0,0.6);
      transform: scale(1.03);
      background: #f2542c;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,10,25,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        text-align: center;
      }
      .nav-links.show {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 800;
      letter-spacing: 0.02em;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 700;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(233,78,27,0.15) 0%, var(--secondary-bg) 70%);
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 12px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
      box-shadow: 0 4px 14px rgba(233,78,27,0.4);
    }
    .btn-primary-custom:hover {
      box-shadow: 0 0 28px rgba(255,184,0,0.7);
      transform: scale(1.04);
      background: #f2542c;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--text-primary);
      padding: 12px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline-custom:hover {
      background: rgba(233,78,27,0.1);
      border-color: #FFB800;
    }
    .trust-signals {
      margin-top: 2rem;
      font-size: 0.85rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .hero-visual {
      flex: 1;
      text-align: center;
    }
    .hero-visual img {
      max-height: 420px;
      object-fit: contain;
      filter: drop-shadow(0 0 30px rgba(233,78,27,0.4));
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .hero-visual img {
        max-height: 280px;
      }
    }

    /* 卡片通用 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      padding: 2rem;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: var(--card-hover-border);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
    }

    /* 优势卡片 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .icon-orange {
      color: var(--primary);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 服务非对称网格 */
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .service-small-grid {
      display: grid;
      grid-template-rows: 1fr 1fr;
      gap: 24px;
    }

    /* 解决方案左右交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
      flex-wrap: wrap;
    }
    .solution-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
    }
    .solution-img img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }

    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: transparent;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 1rem;
    }

    /* FAQ 双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .accordion-button {
      background: transparent;
      color: var(--text-primary);
      font-weight: 600;
    }
    .accordion-item {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(233,78,27,0.25) 0%, var(--dark-surface) 70%);
      border-radius: 24px;
      padding: 4rem 2rem;
      text-align: center;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
      padding: 3rem 0;
    }
    @media (max-width: 768px) {
      .advantage-grid, .stats-grid, .case-grid, .faq-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .solution-row {
        flex-direction: column;
      }
    }