/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --accent-gold: #C8A96E;
      --accent-gold-hover: #B4944F;
      --bg-warm: #F5F3EF;
      --bg-dark-section: #2C2C2C;
      --text-body: #333333;
      --text-muted: #666666;
      --text-on-dark: #FFFFFF;
      --accent-oak: #8B5A2B;
      --card-bg: #FAFAFA;
      --border-light: #E8E5DF;
      --font-serif: "Noto Serif SC", "STSong", "Songti SC", serif;
      --font-display: "Playfair Display", "Georgia", serif;
      --border-radius-sm: 4px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --transition-base: all 0.3s ease;
      --container-max: 1280px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-serif);
      color: var(--text-body);
      background-color: var(--bg-warm);
      margin: 0;
      padding: 0;
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .font-display {
      font-family: var(--font-display);
      font-weight: 600;
      color: var(--primary-dark);
      letter-spacing: 0.5px;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 22px;
      font-weight: 500;
    }
    .section-title {
      margin-bottom: 3rem;
      position: relative;
    }
    .section-title:after {
      content: '';
      display: block;
      width: 60px;
      height: 2px;
      background: var(--accent-gold);
      margin-top: 0.8rem;
    }

    .container {
      max-width: var(--container-max);
      padding-left: 30px;
      padding-right: 30px;
    }

    /* 按钮重置 */
    .btn {
      border-radius: var(--border-radius-sm);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 1px;
      padding: 12px 32px;
      transition: var(--transition-base);
      text-transform: uppercase;
      font-family: var(--font-serif);
    }
    .btn-primary {
      background-color: var(--accent-gold);
      border: 1px solid var(--accent-gold);
      color: var(--primary-dark);
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: var(--accent-gold-hover);
      border-color: var(--accent-gold-hover);
      color: var(--primary-dark);
      box-shadow: none;
    }
    .btn-outline-light {
      background: transparent;
      border: 1px solid #FFFFFF;
      color: #FFFFFF;
    }
    .btn-outline-light:hover {
      background: #FFFFFF;
      color: var(--primary-dark);
      border-color: #FFFFFF;
    }
    .btn-outline-dark {
      background: transparent;
      border: 1px solid var(--primary-dark);
      color: var(--primary-dark);
    }
    .btn-outline-dark:hover {
      background: var(--primary-dark);
      color: #FFFFFF;
    }

    /* 导航栏 */
    .navbar {
      padding: 0;
      height: 70px;
      background: rgba(245, 243, 239, 0.85);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      transition: var(--transition-base);
    }
    .navbar-brand {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 600;
      color: var(--primary-dark) !important;
      letter-spacing: 2px;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    .navbar .nav-link {
      color: var(--text-muted) !important;
      font-size: 15px;
      font-weight: 500;
      padding: 0 1.2rem;
      transition: color 0.2s;
      letter-spacing: 0.5px;
      font-family: var(--font-serif);
    }
    .navbar .nav-link:hover, .navbar .nav-link.active {
      color: var(--accent-gold) !important;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary-dark);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(26, 26, 26, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: var(--bg-warm);
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        padding: 2rem;
        text-align: center;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .navbar-nav {
        margin: 1rem 0;
      }
      .navbar .nav-link {
        padding: 0.8rem 0;
        font-size: 18px;
      }
      .navbar-brand {
        position: static;
        transform: none;
        margin: 0 auto;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: #FFFFFF;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(to right, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.1) 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero-content h1 {
      color: #FFFFFF;
      font-size: 56px;
      margin-bottom: 1.2rem;
      animation: fadeInUp 0.8s ease;
    }
    .hero-content .lead {
      font-size: 20px;
      margin-bottom: 2rem;
      color: rgba(255,255,255,0.9);
      animation: fadeInUp 0.8s ease 0.1s both;
    }
    .hero-buttons .btn {
      margin-right: 16px;
      animation: fadeInUp 0.8s ease 0.2s both;
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 { font-size: 38px; }
      h2 { font-size: 28px; }
    }

    /* 核心优势 - 不对称栅格 */
    .advantage-card {
      background: #FFFFFF;
      border-radius: var(--border-radius-sm);
      padding: 2.5rem 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      border: 1px solid transparent;
    }
    .advantage-card:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent-gold);
      transform: translateY(-4px);
    }
    .advantage-icon {
      font-size: 42px;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
    }
    .row-advantage .col-md-6:first-child, .row-advantage .col-md-6:nth-child(2) {
      margin-bottom: 30px;
    }
    .row-advantage .col-md-8.offset-md-2 {
      margin-top: 30px;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--card-bg);
      border-radius: var(--border-radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      border: 1px solid var(--border-light);
    }
    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-color: var(--accent-gold);
    }
    .service-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .service-body {
      padding: 1.8rem;
    }

    /* 场景图文交错 */
    .scene-block {
      margin-bottom: 80px;
    }
    .scene-img {
      width: 100%;
      height: 400px;
      object-fit: cover;
      border-radius: var(--border-radius-sm);
    }
    .gold-line {
      width: 50px;
      height: 3px;
      background: var(--accent-gold);
      margin: 1.2rem 0;
    }

    /* 案例卡片 */
    .case-card {
      background: #FAFAFA;
      border-radius: var(--border-radius-sm);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      min-width: 260px;
      border: 1px solid transparent;
    }
    .case-card:hover {
      background: #FFFFFF;
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent-gold);
    }
    .case-logo-placeholder {
      width: 60px;
      height: 60px;
      background: #E8E5DF;
      border-radius: 50%;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary-dark);
    }
    .badge-tag {
      background: transparent;
      border: 1px solid var(--primary-dark);
      color: var(--primary-dark);
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 2px;
      font-size: 13px;
      display: inline-block;
    }

    /* FAQ */
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-button {
      font-family: var(--font-serif);
      font-weight: 500;
      font-size: 19px;
      color: var(--primary-dark);
      background: transparent;
      box-shadow: none;
      padding: 1.2rem 0;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary-dark);
      background: transparent;
    }
    .accordion-button::after {
      display: none;
    }
    .accordion-button .faq-icon {
      color: var(--accent-gold);
      margin-right: 12px;
      transition: transform 0.3s;
    }
    .accordion-body {
      background: #F9F8F6;
      color: var(--text-muted);
      padding: 1.2rem 1.5rem;
      border-radius: 0;
    }

    /* CTA深色区 */
    .cta-dark {
      background: var(--bg-dark-section);
      color: #FFFFFF;
    }
    .cta-dark h2 {
      color: #FFFFFF;
    }
    .cta-form input {
      background: transparent;
      border: none;
      border-bottom: 1px solid #FFFFFF;
      border-radius: 0;
      color: #FFFFFF;
      padding: 12px 8px;
      width: 100%;
      font-family: var(--font-serif);
    }
    .cta-form input::placeholder {
      color: #999;
    }
    .cta-form .btn {
      width: auto;
    }

    /* 页脚 */
    footer {
      background: var(--primary-dark);
      color: #999;
      padding: 60px 0 30px;
      font-size: 15px;
    }
    footer a {
      color: #aaa;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--accent-gold);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 18px;
      color: #888;
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent-gold);
    }