/* roulang page: index */
:root {
      --primary: #1A2B3C;
      --accent: #C9A96E;
      --bg: #F7F5F0;
      --text: #2C2C2C;
      --text-light: #5A5A5A;
      --white: #FFFFFF;
      --border-light: #E5E0D8;
      --shadow-sm: 0 4px 20px rgba(26,43,60,0.06);
      --shadow-hover: 0 8px 30px rgba(26,43,60,0.12);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition: 0.3s ease;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Noto Sans SC', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--primary);
      font-weight: 700;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1140px;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 导航 */
    .navbar {
      padding: 16px 0;
      transition: background 0.4s ease, box-shadow 0.4s ease;
      background: transparent;
      z-index: 1030;
    }
    .navbar.scrolled {
      background: rgba(247,245,240,0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary) !important;
      letter-spacing: 1px;
    }
    .navbar-brand .accent-dot {
      color: var(--accent);
      font-size: 1.1rem;
      margin-left: 2px;
    }
    .navbar-nav .nav-link {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 0.95rem;
      color: var(--text-light) !important;
      margin: 0 20px;
      padding: 6px 0 !important;
      position: relative;
      transition: color 0.2s;
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%);
      width: 20px;
      height: 2px;
      background: var(--accent);
      opacity: 0;
      transition: opacity 0.2s;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary) !important;
    }
    .navbar-nav .nav-link.active::after,
    .navbar-nav .nav-link:hover::after {
      opacity: 1;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
      padding: 0;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: rgba(247,245,240,0.98);
        backdrop-filter: blur(12px);
        padding: 20px;
        border-radius: var(--radius-md);
        margin-top: 10px;
      }
      .navbar-nav .nav-link {
        margin: 8px 0;
        font-size: 1rem;
      }
    }
    
    /* Hero */
    #hero {
      padding: 160px 0 100px;
      background: var(--bg);
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    #hero .hero-title {
      font-family: var(--font-serif);
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 24px;
    }
    #hero .hero-sub {
      font-size: 1.1rem;
      color: var(--text-light);
      max-width: 480px;
      margin-bottom: 40px;
      line-height: 1.8;
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      background: rgba(201,169,110,0.08);
    }
    .hero-image-wrapper img {
      border-radius: var(--radius-lg);
      object-fit: cover;
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
    }
    .btn-primary-custom {
      background: var(--primary);
      color: var(--white);
      border: none;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-family: var(--font-sans);
      font-weight: 500;
      transition: var(--transition);
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      background: var(--accent);
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(201,169,110,0.2);
    }
    .btn-outline-custom {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-family: var(--font-sans);
      font-weight: 500;
      transition: var(--transition);
      letter-spacing: 0.5px;
      margin-left: 16px;
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: var(--white);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(26,43,60,0.15);
    }
    @media (max-width: 991px) {
      #hero {
        padding: 120px 0 60px;
        text-align: center;
      }
      #hero .hero-title {
        font-size: 2.4rem;
      }
      #hero .hero-sub {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
      }
      .hero-image-wrapper {
        margin-top: 40px;
      }
      .btn-outline-custom {
        margin-left: 12px;
      }
    }
    @media (max-width: 576px) {
      #hero .hero-title {
        font-size: 2rem;
      }
      .btn-primary-custom, .btn-outline-custom {
        display: block;
        width: 100%;
        margin: 10px 0;
      }
      .btn-outline-custom {
        margin-left: 0;
      }
    }
    
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-light);
      max-width: 600px;
      margin: 0 auto 50px;
    }
    
    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 40px 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      text-align: center;
      border: none;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 48px;
      color: var(--accent);
      margin-bottom: 24px;
      transition: transform 0.3s;
    }
    .service-card:hover .service-icon {
      transform: scale(1.1);
    }
    .service-card h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      font-size: 1.5rem;
      margin-bottom: 16px;
    }
    .service-card p {
      color: var(--text-light);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    
    /* 优势数据 */
    .stat-item {
      text-align: center;
      padding: 20px;
    }
    .stat-number {
      font-family: 'DIN Alternate', 'Segoe UI', sans-serif;
      font-weight: 600;
      font-size: 3rem;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-divider {
      width: 30px;
      height: 1px;
      background: var(--accent);
      margin: 12px auto;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-light);
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    
    /* 案例卡片 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      margin-bottom: 40px;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
      border-radius: var(--radius-md) 0 0 var(--radius-md);
    }
    .case-content {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-content h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      font-size: 1.6rem;
      margin-bottom: 12px;
    }
    .case-tag {
      color: var(--accent);
      font-size: 0.85rem;
      font-weight: 500;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }
    .case-desc {
      color: var(--text-light);
      font-size: 0.95rem;
    }
    @media (max-width: 991px) {
      .case-img {
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        aspect-ratio: 16/9;
      }
      .case-content {
        padding: 30px;
      }
    }
    
    /* FAQ */
    .accordion-item {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: 6px !important;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-button {
      font-family: var(--font-serif);
      font-weight: 500;
      font-size: 1.1rem;
      color: var(--primary);
      background: var(--white);
      padding: 20px 24px;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: var(--white);
      box-shadow: inset 0 -1px 0 var(--border-light);
    }
    .accordion-button::after {
      background-image: none;
      content: "+";
      font-size: 1.5rem;
      font-weight: 300;
      color: var(--accent);
      width: auto;
      height: auto;
      line-height: 1;
    }
    .accordion-button:not(.collapsed)::after {
      background-image: none;
      content: "−";
      color: var(--accent);
    }
    .accordion-body {
      font-size: 0.95rem;
      color: var(--text-light);
      padding: 20px 24px;
      line-height: 1.8;
    }
    .accordion-button:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(201,169,110,0.2);
    }
    
    /* 联系 CTA */
    #contact {
      background: var(--primary);
      color: var(--white);
      padding: 100px 0;
    }
    #contact .section-title {
      color: var(--white);
    }
    .form-control-custom {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(201,169,110,0.3);
      border-radius: var(--radius-sm);
      color: var(--white);
      padding: 14px 16px;
      font-size: 0.95rem;
      transition: 0.2s;
    }
    .form-control-custom::placeholder {
      color: #AAAAAA;
      font-weight: 300;
    }
    .form-control-custom:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(201,169,110,0.3);
      background: rgba(255,255,255,0.12);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--primary);
      font-weight: 600;
      border: none;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      transition: var(--transition);
      letter-spacing: 0.5px;
    }
    .btn-accent:hover {
      background: #dbb878;
      color: #0f1e2a;
      transform: translateY(-2px);
    }
    .contact-info p {
      color: #CCCCCC;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }
    .contact-info i {
      color: var(--accent);
      width: 20px;
      margin-right: 12px;
    }
    
    /* Footer */
    footer {
      background: #0f1e2a;
      color: #AAAAAA;
      padding: 30px 0;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255,255,255,0.08);
    }
    footer a {
      color: #AAAAAA;
    }
    footer a:hover {
      color: var(--accent);
    }
    
    /* 辅助 */
    .text-accent {
      color: var(--accent);
    }
    .bg-primary-dark {
      background: var(--primary);
    }
    @media (max-width: 576px) {
      .section-title {
        font-size: 2rem;
      }
      .stat-number {
        font-size: 2.4rem;
      }
      .navbar-brand {
        font-size: 1.3rem;
      }
    }