/* roulang page: index */
:root {
      --brand-deep: #4A3728;
      --brand-gold: #B8864D;
      --brand-gold-hover: #9C6E3D;
      --brand-champagne: #C9A96E;
      --brand-emerald: #2E5C4A;
      --bg-warm: #FAF7F2;
      --bg-light: #F5F4F0;
      --text-primary: #1C1C1C;
      --text-secondary: #5C5C5C;
      --text-on-dark: #FFFFFF;
      --border-light: #E8E3DC;
      --border-soft: #E0DBD2;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.06);
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-serif: 'STSong', 'Songti SC', serif;
      --border-radius-sm: 4px;
      --border-radius-md: 6px;
      --border-radius-lg: 8px;
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      margin-top: 0;
    }

    p {
      color: var(--text-secondary);
      max-width: 720px;
      font-size: 1rem;
      font-weight: 400;
      line-height: 1.75;
    }

    a {
      text-decoration: none;
      color: var(--brand-gold);
      transition: var(--transition-base);
    }

    a:hover {
      color: var(--brand-gold-hover);
    }

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
      width: 100%;
    }

    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1030;
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .brand-logo {
      font-family: var(--font-serif);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--brand-deep);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }

    .nav-link-item {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      background: none;
      border: none;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-link-item:hover {
      color: var(--brand-gold);
    }

    .nav-link-item.active {
      color: var(--brand-deep);
    }

    .nav-link-item.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--brand-gold);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--brand-deep);
      display: block;
      transition: 0.2s;
    }

    @media (max-width: 991px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250, 247, 242, 0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 28px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: 0 12px 24px rgba(0,0,0,0.04);
      }
      .nav-links.show {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-link-item {
        font-size: 1.2rem;
      }
    }

    /* Hero */
    .hero-section {
      height: 90vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: 72px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to bottom, rgba(0,0,0,0.45) 0%, rgba(0,0,0,0.2) 100%);
    }

    .hero-content {
      position: relative;
      max-width: 700px;
      color: white;
    }

    .hero-line {
      width: 60px;
      height: 2px;
      background: var(--brand-champagne);
      margin-bottom: 24px;
    }

    h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
      text-shadow: 0 2px 8px rgba(0,0,0,0.3);
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.9);
      max-width: 560px;
      margin-bottom: 32px;
    }

    .btn-primary-gold {
      background: var(--brand-gold);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--border-radius-sm);
      transition: 0.2s;
      display: inline-block;
    }

    .btn-primary-gold:hover {
      background: var(--brand-gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(0,0,0,0.15);
      color: white;
    }

    .btn-outline-gold {
      background: transparent;
      border: 1.5px solid var(--brand-gold);
      color: var(--brand-gold);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--border-radius-sm);
      transition: 0.2s;
    }

    .btn-outline-gold:hover {
      background: var(--brand-gold);
      color: white;
      transform: translateY(-2px);
    }

    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      .hero-section {
        height: 80vh;
      }
    }

    .section-title h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title .gold-line {
      width: 50px;
      height: 2px;
      background: var(--brand-gold);
      margin: 12px 0 24px;
    }

    .card-custom {
      background: white;
      border: none;
      border-radius: var(--border-radius-lg);
      box-shadow: var(--shadow-card);
      padding: 32px;
      height: 100%;
      transition: var(--transition-base);
    }

    .card-custom:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .icon-placeholder {
      width: 48px;
      height: 48px;
      background: rgba(184,134,77,0.1);
      border-radius: var(--border-radius-md);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--brand-gold);
    }

    .data-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--brand-emerald);
      line-height: 1.2;
    }

    .service-card img {
      height: 220px;
      object-fit: cover;
      border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .footer-dark {
      background: #151515;
      color: #8C8C8C;
    }

    .footer-brand {
      font-weight: 700;
      color: white;
      font-size: 1.4rem;
    }

    .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--brand-gold);
      outline-offset: 2px;
    }