/* roulang page: index */
:root {
      --primary-charcoal: #1A1A1A;
      --secondary-charcoal: #2C2C2C;
      --accent-gold: #C8A96E;
      --accent-copper: #B68B40;
      --bg-warm-gray: #FAF7F2;
      --bg-milky: #F5F2EB;
      --text-dark: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-light: #8A8A8A;
      --border-light: #E8E3DA;
      --border-medium: #D2CCC0;
      --white-warm: #FDFBF7;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.04);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'SF Pro Display', system-ui, -apple-system, sans-serif;
      --radius-sm: 6px;
      --radius-md: 8px;
      --transition-base: 0.25s ease;
      --transition-smooth: 0.3s ease;
      --container-max: 1280px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm-gray);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      font-size: 16px;
      letter-spacing: 0.01em;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .navbar-lejing {
      background: rgba(250, 247, 242, 0.85);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      height: 72px;
      box-shadow: none;
      border-bottom: 1px solid transparent;
      transition: var(--transition-smooth);
      padding: 0;
    }
    .navbar-lejing .navbar-brand {
      font-family: var(--font-title);
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-charcoal);
      letter-spacing: -0.01em;
      padding: 0;
    }
    .navbar-lejing .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      margin-left: 28px;
      padding: 0;
      position: relative;
      transition: var(--transition-base);
    }
    .navbar-lejing .nav-link:hover {
      color: var(--primary-charcoal);
    }
    .navbar-lejing .nav-link.active {
      color: var(--accent-gold);
    }
    .navbar-lejing .nav-link.active::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 100%;
      height: 2px;
      background: var(--accent-gold);
      border-radius: 2px;
    }
    .navbar-toggler {
      border: none;
      padding: 4px;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    .hamburger-line {
      display: block;
      width: 22px;
      height: 1.5px;
      background: var(--primary-charcoal);
      margin: 5px 0;
      transition: var(--transition-base);
    }
    @media (max-width: 768px) {
      .navbar-lejing .nav-link {
        margin-left: 0;
        padding: 12px 0;
        font-size: 18px;
        border-bottom: 1px solid var(--border-light);
      }
      .navbar-collapse {
        background: var(--bg-warm-gray);
        padding: 20px;
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        box-shadow: var(--shadow-card);
      }
    }
    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background-color: transparent;
      position: relative;
    }
    .hero-title {
      font-size: clamp(36px, 5vw, 64px);
      line-height: 1.2;
      color: var(--primary-charcoal);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .btn-gold {
      background: var(--accent-gold);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 34px;
      border-radius: var(--radius-sm);
      font-size: 16px;
      letter-spacing: 0.3px;
      transition: var(--transition-smooth);
      display: inline-block;
    }
    .btn-gold:hover {
      background: #A07D35;
      transform: scale(1.02);
      color: white;
    }
    .metric-board {
      display: flex;
      flex-direction: column;
      gap: 28px;
      background: rgba(255,255,255,0.4);
      padding: 24px 0;
      border-left: 1px solid var(--border-light);
      padding-left: 40px;
    }
    .metric-item .metric-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 15px;
      color: var(--secondary-charcoal);
      font-weight: 500;
    }
    .hero-decor {
      position: absolute;
      right: 0;
      top: 20px;
      width: 320px;
      height: 320px;
      background: url('/assets/images/backpic/back-1.webp') center/contain no-repeat;
      opacity: 0.25;
      pointer-events: none;
    }
    @media (max-width: 768px) {
      .hero-section {
        padding: 100px 0 60px;
      }
      .metric-board {
        border-left: none;
        padding-left: 0;
        flex-direction: row;
        gap: 16px;
        overflow-x: auto;
        margin-top: 30px;
      }
    }
    /* 服务卡片 */
    .service-card {
      background: var(--white-warm);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition-smooth);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
      border-color: var(--border-medium);
    }
    .service-icon {
      font-size: 40px;
      color: var(--accent-gold);
      margin-bottom: 24px;
      transition: transform 0.25s ease;
    }
    .service-card:hover .service-icon {
      transform: rotate(5deg);
    }
    .service-title {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-metric {
      font-size: 20px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 12px;
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      flex: 1;
    }
    .link-gold {
      color: var(--accent-gold);
      font-weight: 500;
      display: inline-block;
      margin-top: 16px;
      position: relative;
    }
    .link-gold::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 1.5px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .link-gold:hover::after {
      width: 100%;
    }
    /* 结果对比 */
    .compare-table {
      background: var(--bg-milky);
      border-radius: var(--radius-md);
      padding: 40px;
    }
    .compare-row {
      display: flex;
      align-items: center;
      padding: 18px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .compare-left, .compare-right {
      flex: 1;
      font-size: 18px;
      font-weight: 500;
    }
    .compare-right {
      color: var(--accent-gold);
      font-weight: 700;
    }
    .arrow-up {
      color: var(--accent-gold);
      margin-left: 6px;
    }
    .compare-divider {
      width: 1px;
      background: var(--border-medium);
      height: 24px;
      margin: 0 24px;
    }
    @media (max-width: 768px) {
      .compare-table {
        padding: 24px;
      }
      .compare-left, .compare-right {
        font-size: 16px;
      }
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-charcoal);
      background: transparent;
      box-shadow: none;
      padding: 20px 0;
      border-left: 3px solid transparent;
      transition: 0.2s ease;
    }
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--primary-charcoal);
      border-left: 3px solid var(--accent-gold);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: transparent;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-body {
      font-size: 16px;
      color: var(--text-muted);
      padding: 0 0 24px 0;
      background: transparent;
    }
    /* 表单 */
    .inline-form .email-input {
      border: none;
      border-bottom: 1px solid var(--border-medium);
      border-radius: 0;
      padding: 12px 8px;
      background: transparent;
      font-size: 16px;
      outline: none;
      transition: border 0.2s;
      width: 240px;
    }
    .inline-form .email-input:focus {
      border-bottom: 2px solid var(--accent-gold);
    }
    .btn-submit {
      background: var(--accent-gold);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      margin-left: 12px;
      transition: var(--transition-smooth);
    }
    .btn-submit:hover {
      background: #A07D35;
      transform: scale(1.02);
    }
    footer {
      background: var(--primary-charcoal);
      color: #D4D0C8;
      padding: 48px 0 24px;
    }
    .footer-brand {
      font-weight: 700;
      font-size: 22px;
      color: white;
    }
    @media (max-width: 768px) {
      .inline-form {
        flex-direction: column;
      }
      .inline-form .email-input {
        width: 100%;
        margin-bottom: 16px;
      }
    }