/* roulang page: index */
:root {
      --primary: #1e2c2a;
      --primary-light: #2a3b38;
      --accent: #c4a882;
      --accent-hover: #a88d6a;
      --bg: #f7f5f2;
      --surface: #ffffff;
      --text: #1a1a1a;
      --text-secondary: #5c5c5c;
      --text-muted: #8a8a8a;
      --border: #e8e5e0;
      --border-light: #d9d5cf;
      --radius-sm: 6px;
      --radius: 8px;
      --radius-lg: 12px;
      --shadow-xs: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --transition: 0.25s ease-out;
    }

    * {
      box-sizing: border-box;
    }

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

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.2px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部信息条 */
    .top-bar {
      background: var(--primary);
      color: var(--accent);
      font-size: 11px;
      height: 34px;
      display: flex;
      align-items: center;
      letter-spacing: 0.3px;
    }
    .top-bar a {
      color: var(--accent);
      font-weight: 500;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 主导航 */
    .main-nav {
      background: var(--surface);
      height: 64px;
      border-bottom: 1px solid var(--border);
      transition: background var(--transition), box-shadow var(--transition);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .main-nav.scrolled {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-logo i {
      color: var(--accent);
      font-size: 22px;
    }
    .navbar-nav .nav-link {
      color: var(--text) !important;
      font-size: 14px;
      font-weight: 500;
      padding: 0 14px !important;
      position: relative;
      transition: color var(--transition);
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 20px;
      height: 2px;
      background: var(--accent);
      transition: transform var(--transition);
    }
    .navbar-nav .nav-link:hover {
      color: var(--accent) !important;
    }
    .navbar-nav .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
      font-size: 1.5rem;
      padding: 0;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background-color: var(--bg);
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      right: -10%;
      top: 50%;
      transform: translateY(-50%);
      width: 55%;
      max-width: 700px;
      opacity: 0.18;
      pointer-events: none;
      background: url('/assets/images/backpic/back-1.webp') center/contain no-repeat;
      height: 100%;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      line-height: 1.3;
    }
    .hero .lead {
      font-size: 17px;
      color: var(--text-secondary);
      max-width: 560px;
      margin: 20px 0 32px;
    }
    .btn-primary-custom {
      background: var(--accent);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      letter-spacing: 0.3px;
    }
    .btn-primary-custom:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 30px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 16px;
      margin-bottom: 48px;
    }

    /* 指标卡片 */
    .metric-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
      transition: all var(--transition);
      box-shadow: var(--shadow-xs);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-number {
      font-size: 52px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-mono);
      letter-spacing: -1px;
      line-height: 1.2;
    }
    .metric-label {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      margin: 8px 0 4px;
    }
    .metric-desc {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 服务矩阵非对称网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 32px 24px;
      transition: all var(--transition);
      box-shadow: var(--shadow-xs);
      border: 1px solid transparent;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(196, 168, 130, 0.1);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: background var(--transition);
    }
    .service-card:hover .service-icon {
      background: rgba(196, 168, 130, 0.2);
    }
    .service-icon img {
      width: 36px;
      height: 36px;
      object-fit: contain;
    }
    .service-title {
      font-size: 19px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
      flex: 1;
    }
    .service-link {
      font-size: 13px;
      font-weight: 500;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap var(--transition);
    }
    .service-link i {
      font-size: 12px;
      transition: transform var(--transition);
    }
    .service-card:hover .service-link i {
      transform: translateX(4px);
    }
    .brand-motto {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 1px;
      background: rgba(30,44,42,0.03);
      border-radius: var(--radius);
    }

    /* 对比区 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1px 1fr;
      gap: 40px;
      align-items: start;
    }
    .divider-line {
      width: 1px;
      background: var(--border-light);
      height: 100%;
    }
    .compare-col h4 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .left-col h4 {
      color: var(--text-muted);
    }
    .right-col h4 {
      color: var(--primary);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }
    .left-value {
      color: var(--text-muted);
      font-weight: 500;
    }
    .right-value {
      color: var(--primary);
      font-weight: 700;
      font-size: 18px;
    }
    .source-note {
      font-size: 11px;
      color: var(--text-muted);
      font-style: italic;
      margin-top: 24px;
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border);
      background: transparent;
    }
    .accordion-custom .accordion-button {
      background: transparent;
      font-size: 16px;
      font-weight: 600;
      color: var(--text);
      padding: 18px 0;
      box-shadow: none;
      transition: color var(--transition);
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: transparent;
    }
    .accordion-custom .accordion-button::after {
      background-image: none;
      content: '+';
      font-size: 22px;
      font-weight: 300;
      color: var(--accent);
      transition: transform 0.2s;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .accordion-custom .accordion-button:not(.collapsed)::after {
      transform: rotate(45deg);
    }
    .accordion-body {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.8;
      padding: 0 0 20px 0;
      max-width: 680px;
    }

    /* CTA 表单 */
    .cta-section {
      background: #e9ece8;
    }
    .form-control {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      font-size: 15px;
      transition: border var(--transition);
      background: white;
    }
    .form-control:focus {
      border-color: var(--accent);
      box-shadow: none;
    }
    .trust-badges i {
      color: var(--accent);
      margin-right: 4px;
    }
    .trust-badges span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 页脚 */
    footer {
      background: var(--primary);
      color: #b0b0b0;
      padding: 60px 0 30px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .footer-desc {
      font-size: 14px;
      color: #b0b0b0;
      margin-top: 10px;
    }
    .footer-links a {
      color: #b0b0b0;
      font-size: 14px;
      margin-right: 16px;
      transition: color var(--transition);
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .copyright {
      font-size: 11px;
      color: #7a7a7a;
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
      margin-top: 30px;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 32px;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .comparison-wrapper {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .divider-line {
        display: none;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
      }
    }
    @media (max-width: 576px) {
      .metric-card {
        padding: 20px 16px;
      }
      .metric-number {
        font-size: 42px;
      }
      section {
        padding: 60px 0;
      }
    }