/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-coral: #E94560;
      --secondary-blue: #0F3460;
      --bg-light: #F8F9FA;
      --surface: #FFFFFF;
      --text-primary: #2D3436;
      --text-muted: #636E72;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --bs-primary: #E94560;
      --bs-body-bg: #F8F9FA;
      --bs-body-color: #2D3436;
      --bs-border-radius: 8px;
      --bs-card-border-radius: 16px;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-light);
      color: var(--text-primary);
      font-weight: 400;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

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

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

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

    /* 导航栏 */
    .navbar {
      background: rgba(26, 26, 46, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(15, 52, 96, 0.4);
      padding: 0 24px;
      transition: var(--transition);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: white !important;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .navbar-brand span {
      color: var(--accent-coral);
      font-size: 1.8rem;
      font-weight: 700;
      margin-right: 2px;
    }

    .nav-link {
      color: rgba(255,255,255,0.85) !important;
      font-weight: 500;
      font-size: 1rem;
      margin: 0 6px;
      position: relative;
      transition: 0.3s;
    }
    .nav-link:hover {
      color: white !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent-coral);
      transition: 0.3s ease;
      transform: translateX(-50%);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-outline-accent {
      border: 2px solid var(--accent-coral);
      color: var(--accent-coral);
      background: transparent;
      border-radius: 24px;
      padding: 6px 20px;
      font-weight: 600;
    }
    .btn-outline-accent:hover {
      background: rgba(233,69,96,0.1);
      color: var(--accent-coral);
      border-color: var(--accent-coral);
    }
    .btn-accent {
      background: var(--accent-coral);
      border: none;
      color: white;
      border-radius: 24px;
      padding: 8px 22px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(233,69,96,0.4);
      transition: var(--transition);
    }
    .btn-accent:hover {
      background: #d63851;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(233,69,96,0.5);
      color: white;
    }

    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    @media (max-width: 991px) {
      .navbar-collapse {
        background: #1A1A2E;
        padding: 20px;
        border-radius: 16px;
        margin-top: 12px;
      }
    }

    /* Hero */
    .hero-section {
      background-color: #F8F9FA;
      background-image: radial-gradient(circle at 20% 30%, rgba(26,26,46,0.03) 0%, transparent 30%);
      padding: 120px 0 100px;
      position: relative;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.25;
      color: var(--primary-deep);
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--accent-coral), #0F3460);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-illustration {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 340px;
      border-radius: 32px;
      background-color: #e0e0e0;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.05);
    }
    .btn-primary-custom {
      background: var(--accent-coral);
      border: none;
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(233,69,96,0.3);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background: #d63851;
      transform: translateY(-2px);
      box-shadow: 0 10px 22px rgba(233,69,96,0.45);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--accent-coral);
      color: var(--accent-coral);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      background: transparent;
    }
    .btn-outline-custom:hover {
      background: rgba(233,69,96,0.08);
    }

    /* 能力卡片 */
    .capability-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
      height: auto;
    }
    .capability-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(233,69,96,0.2);
    }
    .capability-icon {
      font-size: 44px;
      color: var(--accent-coral);
      margin-bottom: 20px;
    }

    /* 流程 */
    .step-node {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-coral);
      border-radius: 50%;
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      box-shadow: 0 6px 16px rgba(233,69,96,0.3);
    }

    /* 案例卡片 */
    .case-card {
      background: var(--surface);
      border-radius: 12px;
      border: 1px solid var(--border-light);
      transition: 0.3s;
      overflow: hidden;
    }
    .case-card:hover {
      border-color: var(--accent-coral);
    }
    .case-img {
      background: #e0e0e0 url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      min-height: 200px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: var(--surface);
      color: var(--text-primary);
      border-radius: 8px !important;
      box-shadow: none;
      border: 1px solid var(--border-light);
    }
    .accordion-button:not(.collapsed) {
      background: var(--surface);
      color: var(--accent-coral);
      border-color: var(--accent-coral);
      box-shadow: none;
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      background: transparent;
    }

    /* 底部CTA */
    .cta-gradient {
      background: linear-gradient(135deg, #1A1A2E, #0F3460);
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }
    .btn-glow {
      background: var(--accent-coral);
      border: none;
      color: white;
      padding: 16px 48px;
      border-radius: 8px;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(233,69,96,0.5);
      transition: 0.3s;
    }
    .btn-glow:hover {
      background: #f0526d;
      box-shadow: 0 0 30px rgba(233,69,96,0.7);
      color: white;
      transform: scale(1.02);
    }

    footer {
      background: #1A1A2E;
      color: rgba(255,255,255,0.7);
    }
    footer a {
      color: rgba(255,255,255,0.65);
    }
    footer a:hover {
      color: var(--accent-coral);
    }
    .footer-brand {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      .hero-illustration {
        min-height: 240px;
        margin-top: 24px;
      }
    }