/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-gold: #C9A96E;
      --bg-warm: #F8F6F2;
      --dark-bg: #2D2D3A;
      --text-main: #2C2C2C;
      --text-muted: #5A5A5A;
      --highlight-darkgold: #B8860B;
      --border-light: #E8E5DF;
      --border-input: #D1CDC6;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      margin: 0;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(248,246,242,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      padding: 0.8rem 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 2px;
      color: var(--primary-deep);
    }
    .logo-text span {
      color: var(--accent-gold);
    }
    .nav-left, .nav-right {
      display: flex;
      gap: 2rem;
    }
    .nav-left {
      margin-right: 2.5rem;
    }
    .nav-right {
      margin-left: 2.5rem;
    }
    .nav-link {
      color: var(--text-main);
      font-weight: 500;
      padding: 0.4rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
      white-space: nowrap;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .navbar-toggler-custom {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      position: absolute;
      right: 20px;
      top: 50%;
      transform: translateY(-50%);
    }
    @media (max-width: 992px) {
      .nav-left, .nav-right {
        display: none;
      }
      .navbar-toggler-custom {
        display: block;
      }
      .nav-container {
        justify-content: space-between;
      }
      .logo-text {
        margin-left: 0;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(248,246,242,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        align-items: center;
        padding: 1.5rem 0;
        gap: 1.2rem;
        box-shadow: 0 12px 20px rgba(0,0,0,0.05);
      }
      .mobile-menu.show {
        display: flex;
      }
      .mobile-menu .nav-link {
        font-size: 1.2rem;
      }
    }
    @media (min-width: 993px) {
      .mobile-menu {
        display: none !important;
      }
    }
    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, rgba(26,26,46,0.75) 0%, rgba(45,45,58,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: var(--white);
      text-align: center;
      margin-top: 72px;
      padding: 2rem 20px;
    }
    .hero h1 {
      font-weight: 700;
      font-size: 3rem;
      margin-bottom: 1.5rem;
      line-height: 1.3;
      color: white;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 720px;
      margin: 0 auto 2.5rem;
    }
    .btn-primary-custom {
      background: var(--accent-gold);
      border: none;
      color: var(--primary-deep);
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      transition: 0.25s;
    }
    .btn-primary-custom:hover {
      background: #B8960E;
      color: var(--primary-deep);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      transition: 0.25s;
    }
    .btn-outline-custom:hover {
      background: rgba(201,169,110,0.15);
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2rem;
      }
      .hero .subtitle {
        font-size: 1rem;
      }
    }
    /* 通用区块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-weight: 600;
      font-size: 2.2rem;
      margin-bottom: 0.8rem;
      color: var(--primary-deep);
    }
    .section-subtitle {
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto 3rem;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--card-shadow);
      transition: 0.25s;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    .icon-placeholder {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      border: 2px solid var(--accent-gold);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--accent-gold);
      font-size: 1.8rem;
      transition: 0.2s;
    }
    .service-card:hover .icon-placeholder {
      background: var(--accent-gold);
      color: var(--white);
    }
    /* 数据优势 */
    .advantages-bg {
      background: var(--dark-bg);
      color: white;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }
    .stat-label {
      opacity: 0.8;
    }
    /* 案例卡片 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--card-hover-shadow);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .badge-tag {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    /* 解决方案图文 */
    .solution-img {
      border-radius: var(--radius-card);
      width: 100%;
      height: auto;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #FAF9F7;
      box-shadow: none;
      border-left: 3px solid var(--accent-gold);
    }
    .accordion-button {
      font-weight: 600;
      background: var(--white);
      border: none;
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 1.5rem;
    }
    .accordion-item {
      border: none;
      background: transparent;
    }
    /* 联系表单 */
    .form-control {
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      padding: 0.7rem 1rem;
    }
    .form-control:focus {
      border-color: var(--accent-gold);
      box-shadow: none;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #CCCCCC;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    .copyright {
      background: #151525;
      font-size: 0.9rem;
    }
    @media (max-width: 576px) {
      .btn-primary-custom, .btn-outline-custom {
        display: block;
        width: 100%;
        margin-bottom: 0.5rem;
      }
      section {
        padding: 3rem 0;
      }
    }