/* roulang page: index */
:root {
      --primary: #1E3A3F;
      --primary-light: #2C4F55;
      --primary-dark: #152A2E;
      --accent: #C49A6C;
      --accent-light: #D9B68C;
      --success: #5C8A7A;
      --warning-muted: #B09B8B;
      --bg-warm: #FAF8F6;
      --bg-light: #F5F0EB;
      --bg-dark: #2C3537;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #6B6B6B;
      --text-light: #C5BFB8;
      --text-white: #F5F0EB;
      --border-light: #E8E3DE;
      --border-subtle: #D3CCC4;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.03), 0 1px 3px rgba(0,0,0,0.05);
      --shadow-card: 0 4px 14px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.07), 0 4px 10px rgba(0,0,0,0.05);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-btn: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 600;
      color: var(--text-dark);
      letter-spacing: -0.01em;
    }

    a {
      text-decoration: none;
      color: var(--primary);
      transition: color 0.2s, border-color 0.2s;
    }

    a:hover {
      color: var(--accent);
    }

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航：居中Logo + 两侧链接 */
    .navbar-brand-custom {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary) !important;
      line-height: 1.2;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      text-align: center;
      white-space: nowrap;
    }

    .navbar-brand-sub {
      display: block;
      font-size: 0.7rem;
      font-weight: 400;
      color: var(--accent);
      letter-spacing: 0.06em;
      font-family: var(--font-number);
    }

    .navbar {
      background-color: #ffffff;
      box-shadow: 0 1px 0 0 var(--border-light);
      height: 78px;
      padding: 0 16px;
    }

    .nav-link-anchor {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body) !important;
      margin: 0 10px;
      padding: 8px 4px !important;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
    }

    .nav-link-anchor:hover {
      color: var(--primary) !important;
      border-bottom-color: var(--accent);
    }

    .navbar-toggler {
      border: none;
      color: var(--primary);
      padding: 4px 8px;
    }

    .navbar-toggler:focus {
      box-shadow: 0 0 0 2px rgba(30,58,63,0.2);
    }

    @media (max-width: 991.98px) {
      .navbar-brand-custom {
        position: static;
        transform: none;
        margin-right: auto;
        font-size: 1.4rem;
      }
      .navbar-collapse {
        background: #fff;
        padding: 16px 0;
        border-top: 1px solid var(--border-light);
        margin-top: 8px;
      }
      .nav-link-anchor {
        padding: 12px 20px !important;
        margin: 0;
        border-bottom: 1px solid var(--border-light);
      }
    }

    /* Hero */
    .hero-section {
      background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: var(--text-white);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(30,58,63,0.86) 0%, rgba(30,58,63,0.7) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .hero-sub {
      font-size: 1.25rem;
      font-weight: 300;
      color: rgba(245,240,235,0.9);
      max-width: 580px;
    }

    .btn-primary-custom {
      background-color: var(--accent);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
      box-shadow: 0 4px 10px rgba(196,154,108,0.25);
    }

    .btn-primary-custom:hover {
      background-color: #b38653;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(196,154,108,0.35);
    }

    .btn-outline-light-custom {
      border: 2px solid rgba(245,240,235,0.9);
      color: var(--text-white);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      background: transparent;
      transition: 0.25s;
    }

    .btn-outline-light-custom:hover {
      background: rgba(245,240,235,0.15);
      border-color: #fff;
    }

    .metric-card {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 650;
      color: var(--text-dark);
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
    }

    .bg-soft-primary {
      background-color: #F0F4F3;
    }

    /* 卡片样式 */
    .service-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

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

    .comparison-advantage {
      background-color: #EDF2F1;
      border-left: 5px solid var(--primary);
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
    }

    .comparison-neutral {
      background-color: var(--bg-light);
      border-radius: var(--radius-md);
    }

    .process-step-circle {
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: white;
      font-weight: 700;
      font-size: 1.2rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto;
    }

    .accordion-button:not(.collapsed) {
      background-color: #F4F7F6;
      color: var(--primary);
      box-shadow: none;
      font-weight: 600;
    }

    .accordion-button:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(196,154,108,0.2);
    }

    .footer-title {
      color: #fff;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-link {
      color: var(--text-light);
      text-decoration: none;
      font-size: 0.9rem;
    }

    .footer-link:hover {
      color: var(--accent-light);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-sub {
        font-size: 1rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .metric-number {
        font-size: 2rem;
      }
    }