/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --primary-light: #16213E;
      --accent: #E94560;
      --accent-hover: #C73E54;
      --bg-light: #F8F9FA;
      --bg-gray: #EEF1F5;
      --white: #FFFFFF;
      --text-dark: #1E1E2F;
      --text-muted: #5A5A72;
      --border-light: #E9ECF2;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.1);
      --transition: 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
    }
    .section-padding {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 50px 0;
      }
    }

    /* 自定义导航栏 */
    .navbar-custom {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 15px rgba(0, 0, 0, 0.04);
      padding: 0.8rem 0;
      transition: background 0.3s ease;
    }
    .navbar-custom.scrolled {
      background: rgba(255, 255, 255, 0.95);
    }
    .navbar-brand {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary) !important;
      letter-spacing: -0.3px;
    }
    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--accent) !important;
    }
    .btn-primary-custom {
      background-color: var(--accent);
      border: none;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      color: white;
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background-color: var(--accent-hover);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline-custom {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
    }
    @media (max-width: 992px) {
      .navbar-collapse {
        background: white;
        padding: 1.5rem;
        border-radius: 12px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08);
      }
    }

    /* Hero区域 */
    .hero-section {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      position: relative;
      overflow: hidden;
      color: white;
      padding: 120px 0 100px;
    }
    .hero-bg-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.15rem;
      opacity: 0.9;
      margin: 1.5rem 0 2rem;
    }
    .metric-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(6px);
      border-radius: 12px;
      padding: 1.2rem;
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: white;
    }
    .metric-number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
    }

    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      height: 100%;
      transition: var(--transition);
      border: none;
      overflow: hidden;
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(233, 69, 96, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.4rem;
      margin-bottom: 1.2rem;
    }
    .service-img {
      border-radius: 8px;
      margin-bottom: 1.2rem;
      object-fit: cover;
      height: 140px;
      width: 100%;
    }
    .progress-accent {
      height: 3px;
      background: var(--accent);
      width: 0%;
      transition: width 0.3s ease;
      margin-top: 1rem;
    }
    .service-card:hover .progress-accent {
      width: 100%;
    }

    /* 流程步骤 */
    .step-number {
      font-size: 3rem;
      font-weight: 700;
      color: rgba(26, 26, 46, 0.1);
      line-height: 1;
      margin-bottom: 0.8rem;
    }
    .step-line {
      border-top: 2px dashed #CBD5E1;
      flex: 1;
      margin: 0 0.5rem;
      align-self: center;
      margin-top: -1.5rem;
    }

    /* 对比卡片 */
    .compare-before {
      background: #F1F3F8;
      border-radius: 16px;
      padding: 1.8rem;
    }
    .compare-after {
      background: #FFF5F7;
      border-radius: 16px;
      padding: 1.8rem;
      border: 1px solid var(--accent);
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary);
      box-shadow: none;
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: transparent;
    }
    .faq-q-badge {
      width: 28px;
      height: 28px;
      background: var(--accent);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      margin-right: 12px;
      font-size: 14px;
    }

    /* CTA 表单 */
    .cta-section {
      background: var(--primary);
      border-radius: 24px;
      padding: 3rem;
      color: white;
    }
    .input-email {
      border-radius: 50px;
      padding: 12px 20px;
      border: none;
      width: 100%;
    }
    .btn-submit {
      border-radius: 50px;
      background: var(--accent);
      border: none;
      padding: 12px 28px;
      font-weight: 600;
      color: white;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: var(--accent-hover);
    }

    /* 页脚 */
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 6px;
      font-size: 0.95rem;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .back-to-top {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background: var(--accent);
      color: white;
      border-radius: 50%;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      z-index: 99;
    }