/* roulang page: index */
:root {
      --primary-darkgold: #B8860B;
      --secondary-deepbrown: #3E2723;
      --bg-warmpaper: #FDF8F2;
      --card-white: #FFFFFF;
      --accent-brightgold: #D4A017;
      --text-darkbrown: #2C1810;
      --text-mediumbrown: #5D4037;
      --border-lightcamel: #E8D5C4;
      --shadow-sm: 0 2px 12px rgba(62, 39, 35, 0.06);
      --shadow-hover: 0 6px 24px rgba(62, 39, 35, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 40px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warmpaper);
      color: var(--text-darkbrown);
      line-height: 1.75;
      font-size: 16px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 600;
      color: var(--secondary-deepbrown);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h1 {
      font-size: 42px;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      margin-bottom: 1.5rem;
    }
    h3 {
      font-size: 20px;
      color: var(--secondary-deepbrown);
    }
    p {
      margin-bottom: 1.5em;
      color: var(--text-mediumbrown);
    }
    .text-small {
      font-size: 14px;
      color: var(--text-mediumbrown);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding-left: 15px;
      padding-right: 15px;
    }
    .section-spacing {
      margin-top: 80px;
      margin-bottom: 80px;
    }
    @media (max-width: 768px) {
      .section-spacing {
        margin-top: 48px;
        margin-bottom: 48px;
      }
      h1 {
        font-size: 34px;
      }
      h2 {
        font-size: 28px;
      }
    }
    /* 导航悬浮胶囊 */
    .navbar-custom {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: 90%;
      max-width: 1140px;
      background: rgba(253, 248, 242, 0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-capsule);
      padding: 8px 24px;
      box-shadow: 0 4px 20px rgba(62,39,35,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border: 1px solid rgba(232,213,196,0.4);
    }
    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary-deepbrown);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: var(--accent-brightgold);
      border-radius: 6px;
      position: relative;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-darkbrown);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--accent-brightgold);
    }
    .nav-link.active {
      color: var(--accent-brightgold);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent-brightgold);
      border-radius: 3px;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary-deepbrown);
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(253,248,242,0.98);
        backdrop-filter: blur(16px);
        border-radius: 24px;
        flex-direction: column;
        padding: 24px 0;
        gap: 20px;
        box-shadow: var(--shadow-hover);
      }
      .nav-menu.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .navbar-custom {
        padding: 8px 20px;
      }
    }
    /* 按钮 */
    .btn-primary-gold {
      background: var(--accent-brightgold);
      color: #FFFFFF;
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 10px rgba(212,160,23,0.25);
    }
    .btn-primary-gold:hover {
      background: var(--primary-darkgold);
      box-shadow: 0 8px 16px rgba(184,134,11,0.3);
      color: #fff;
    }
    .btn-outline-gold {
      border: 2px solid var(--primary-darkgold);
      color: var(--primary-darkgold);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline-gold:hover {
      background: var(--primary-darkgold);
      color: #fff;
    }
    /* 卡片 */
    .card-custom {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 24px;
      border: none;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* Hero */
    .hero-section {
      padding-top: 120px;
      padding-bottom: 40px;
    }
    .hero-image {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(62,39,35,0.12);
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .stat-item {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-size: 14px;
      color: var(--text-mediumbrown);
    }
    .stat-number {
      font-size: 22px;
      font-weight: 700;
      color: var(--accent-brightgold);
      font-family: var(--font-serif);
    }
    /* 亮点网格 */
    .highlight-icon {
      width: 64px;
      height: 64px;
      background: var(--accent-brightgold);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      color: white;
      font-size: 28px;
    }
    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      display: inline-block;
      width: 100%;
    }
    @media (max-width: 992px) {
      .masonry-grid {
        column-count: 2;
      }
    }
    @media (max-width: 576px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    .case-tag {
      background: #F3E5D8;
      color: #5D4037;
      border-radius: 20px;
      padding: 2px 12px;
      font-size: 12px;
      display: inline-block;
    }
    /* 方案对比 */
    .solution-highlight {
      border: 2px solid var(--accent-brightgold);
      background: rgba(253,248,242,0.5);
    }
    .divider-dashed {
      border-left: 2px dashed var(--border-lightcamel);
      height: auto;
    }
    @media (max-width: 768px) {
      .divider-dashed {
        border-left: none;
        border-top: 2px dashed var(--border-lightcamel);
        width: 100%;
        margin: 24px 0;
      }
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #FFFFFF;
      color: var(--secondary-deepbrown);
      box-shadow: none;
      border-bottom: 1px solid var(--border-lightcamel);
    }
    .accordion-button {
      background-color: var(--bg-warmpaper);
      font-weight: 600;
      border-radius: 8px;
      border: none;
      padding: 16px 20px;
    }
    .accordion-item {
      border: none;
      margin-bottom: 8px;
      background: transparent;
    }
    .accordion-body {
      background: #FFFFFF;
      border-radius: 0 0 8px 8px;
      color: var(--text-mediumbrown);
    }
    /* 表单 */
    .form-control-custom {
      border: 1px solid var(--border-lightcamel);
      border-radius: 8px;
      padding: 12px 16px;
      background: #fff;
      transition: border 0.2s;
    }
    .form-control-custom:focus {
      border-color: var(--accent-brightgold);
      box-shadow: 0 0 0 0.2rem rgba(212,160,23,0.15);
    }
    /* 页脚 */
    .footer-dark {
      background: #3E2723;
      color: #E8D5C4;
    }
    .footer-dark a {
      color: #E8D5C4;
      transition: color 0.2s;
    }
    .footer-dark a:hover {
      color: var(--accent-brightgold);
    }
    .social-icon {
      width: 36px;
      height: 36px;
      border: 1px solid var(--accent-brightgold);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-brightgold);
      margin-right: 12px;
      transition: all 0.2s;
    }
    .social-icon:hover {
      background: var(--accent-brightgold);
      color: #fff;
    }