/* roulang page: index */
:root {
      --primary-deep: #1E2F2C;
      --accent-gold: #C9A96E;
      --bg-warm: #FAF8F5;
      --bg-texture: #F3EFE9;
      --text-dark: #2C2C2C;
      --text-secondary: #5A5A5A;
      --text-light: #FFFFFF;
      --border-warm: #E5E0D8;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-xl: 16px;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.8;
      margin: 0;
      padding-top: 80px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease, border-color 0.25s ease;
    }

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

    /* 导航栏 */
    .navbar-custom {
      background-color: var(--primary-deep);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      padding: 12px 0;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-area {
      display: flex;
      align-items: center;
      font-size: 24px;
      font-weight: 700;
      color: var(--text-light);
      letter-spacing: 1px;
    }

    .logo-area .gold-dot {
      color: var(--accent-gold);
      margin-right: 6px;
      font-size: 28px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-link-item {
      color: var(--text-light);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 6px 4px;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-link-item::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-gold);
      transition: width 0.25s ease;
    }

    .nav-link-item:hover,
    .nav-link-item.active {
      color: var(--accent-gold);
    }

    .nav-link-item:hover::after,
    .nav-link-item.active::after {
      width: 100%;
    }

    .btn-outline-gold {
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      background: transparent;
      padding: 8px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: all 0.25s;
      white-space: nowrap;
    }

    .btn-outline-gold:hover {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      border-color: var(--accent-gold);
    }

    .btn-solid-dark {
      background-color: var(--primary-deep);
      color: var(--text-light);
      border: none;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background-color 0.25s, transform 0.15s;
      display: inline-block;
      text-align: center;
    }

    .btn-solid-dark:hover {
      background-color: #151F1D;
      color: #fff;
      transform: translateY(-1px);
    }

    .btn-solid-gold {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      border: none;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: background-color 0.25s, transform 0.15s;
      display: inline-block;
      text-align: center;
    }

    .btn-solid-gold:hover {
      background-color: #dbb16b;
      color: #151F1D;
      transform: translateY(-1px);
    }

    .hamburger {
      background: transparent;
      border: none;
      color: white;
      font-size: 24px;
      display: none;
    }

    @media (max-width: 991px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--primary-deep);
        flex-direction: column;
        padding: 24px 0;
        gap: 20px;
        text-align: center;
      }
      .nav-menu.show {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .navbar-custom {
        padding: 12px 24px;
      }
    }

    /* Hero */
    .hero-section {
      background-color: var(--bg-warm);
      padding: 60px 0 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .hero-text {
      flex: 1 1 50%;
    }

    .hero-image {
      flex: 1 1 50%;
      position: relative;
    }

    .hero-image img {
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-hover);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      top: 16px;
      left: 16px;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(201,169,110,0.15) 0%, rgba(30,47,44,0.05) 100%);
      border-radius: var(--radius-xl);
      z-index: 0;
    }

    h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 540px;
    }

    .trust-badge {
      margin-top: 20px;
      font-size: 14px;
      color: var(--text-secondary);
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    @media (max-width: 992px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-subtitle {
        max-width: 100%;
      }
      h1 {
        font-size: 32px;
      }
    }

    /* 区块标题 */
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 50px;
      height: 4px;
      background: var(--accent-gold);
      margin-top: 8px;
    }

    .section-spacing {
      padding: 90px 0;
    }

    @media (max-width: 768px) {
      .section-spacing {
        padding: 60px 0;
      }
      h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
    }

    /* 优势卡片 */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
      margin-top: 40px;
    }

    .adv-item {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: transform 0.2s, box-shadow 0.25s;
      border: 1px solid var(--border-warm);
    }

    .adv-item:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-gold);
    }

    .adv-icon {
      font-size: 42px;
      color: var(--accent-gold);
      margin-bottom: 18px;
      background: var(--bg-texture);
      width: 80px;
      height: 80px;
      line-height: 80px;
      border-radius: 20px;
      display: inline-block;
    }

    .adv-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    @media (max-width: 992px) {
      .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .advantage-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案瀑布卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }

    .solution-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-warm);
    }

    .solution-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .solution-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .solution-body {
      padding: 24px;
      flex: 1;
    }

    .tag-gold {
      color: var(--accent-gold);
      font-weight: 600;
      font-size: 13px;
      margin-bottom: 10px;
    }

    @media (max-width: 992px) {
      .solutions-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比栏 */
    .compare-row {
      display: flex;
      gap: 32px;
      margin-top: 40px;
    }

    .compare-col {
      flex: 1;
      background: #fff;
      border-radius: var(--radius-card);
      padding: 36px;
      box-shadow: var(--shadow-card);
    }

    .compare-col.bbin {
      border-left: 6px solid var(--accent-gold);
      background: var(--bg-warm);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 20px;
    }

    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }

    /* 数据背书 */
    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 30px;
    }

    .data-item {
      text-align: center;
    }

    .data-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      background: transparent;
      margin-bottom: 16px;
    }

    .accordion-custom .accordion-button {
      background: var(--bg-texture);
      border-radius: var(--radius-card) !important;
      font-weight: 600;
      color: var(--primary-deep);
      box-shadow: none;
      padding: 20px 24px;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: #fff;
      border-bottom: 2px solid var(--accent-gold);
      color: var(--primary-deep);
    }

    /* CTA尾屏 */
    .cta-footer-block {
      background: var(--primary-deep);
      padding: 80px 0;
      text-align: center;
    }

    /* 页脚 */
    .footer-custom {
      background: #1E2F2C;
      color: #ccc;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }