/* roulang page: index */
:root {
      --primary: #FF6B5B;
      --primary-hover: #E85A4A;
      --secondary: #3D2B56;
      --secondary-light: #5E4378;
      --accent: #FFB347;
      --success: #2EC4B6;
      --bg-warm: #FDF8F6;
      --white: #FFFFFF;
      --gray-100: #F5F2F0;
      --gray-200: #EBE6E3;
      --gray-600: #4A4A4A;
      --gray-800: #2D2D2D;
      --shadow-sm: 0 4px 20px rgba(61,43,86,0.06);
      --shadow-md: 0 12px 32px rgba(61,43,86,0.10);
      --shadow-lg: 0 20px 40px rgba(61,43,86,0.12);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-warm);
      color: var(--gray-600);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .font-en {
      font-family: var(--font-en);
      letter-spacing: -0.02em;
    }

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

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

    /* 覆写 Bootstrap 默认蓝色 */
    .btn-primary {
      background-color: var(--primary) !important;
      border-color: var(--primary) !important;
      color: white !important;
      border-radius: var(--radius-pill) !important;
      padding: 12px 32px !important;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      box-shadow: none !important;
    }

    .btn-primary:hover, .btn-primary:focus {
      background-color: var(--primary-hover) !important;
      border-color: var(--primary-hover) !important;
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(255,107,91,0.3) !important;
    }

    .btn-outline-secondary {
      border: 2px solid var(--secondary) !important;
      color: var(--secondary) !important;
      background: transparent !important;
      border-radius: var(--radius-pill) !important;
      padding: 12px 32px !important;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
    }

    .btn-outline-secondary:hover {
      background-color: var(--secondary) !important;
      color: white !important;
      border-color: var(--secondary) !important;
    }

    .btn-accent {
      background-color: var(--accent) !important;
      border: none !important;
      color: var(--gray-800) !important;
      border-radius: var(--radius-pill) !important;
      font-weight: 600;
      padding: 12px 28px;
      transition: var(--transition);
    }

    .btn-accent:hover {
      background-color: #ffa31f !important;
      transform: scale(1.02);
    }

    /* 导航覆写 */
    .navbar {
      background-color: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      padding: 0.8rem 0;
      height: 72px;
    }

    .navbar-brand {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--secondary) !important;
      letter-spacing: -0.5px;
    }

    .navbar-brand span {
      color: var(--primary);
    }

    .navbar-nav .nav-link {
      font-weight: 500;
      color: var(--gray-800) !important;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      font-size: 0.95rem;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary) !important;
      border-bottom-color: var(--primary);
    }

    .navbar-toggler {
      border: none;
      color: var(--secondary);
      font-size: 1.5rem;
    }

    .navbar-toggler:focus {
      box-shadow: none;
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 120px;
      background: radial-gradient(circle at 30% 40%, rgba(255,107,91,0.05) 0%, rgba(253,248,246,0) 70%);
    }

    .hero-title {
      font-size: 3.6rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.2;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--gray-600);
      margin: 1.5rem 0 2rem;
    }

    .hero-img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      width: 100%;
      height: auto;
    }

    /* 区块通用 */
    .section-block {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 0.75rem;
    }

    .section-sub {
      color: var(--gray-600);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    .decor-line {
      width: 50px;
      height: 3px;
      background: var(--primary);
      margin: 0.5rem 0 1.5rem;
      border-radius: 2px;
    }

    /* 卡片 */
    .card-custom {
      background: var(--white);
      border: none;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      padding: 2rem 1.5rem;
      height: 100%;
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(255,107,91,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      transition: 0.2s;
      color: var(--primary);
      font-size: 1.8rem;
    }

    .card-custom:hover .icon-circle {
      transform: scale(1.08);
      background: var(--primary);
      color: white;
    }

    .service-card img {
      border-radius: var(--radius-sm) var(--radius-sm) 0 0;
      height: 180px;
      object-fit: cover;
    }

    .case-card {
      background: var(--gray-100);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    /* 深色数据区 */
    .dark-stats {
      background: linear-gradient(135deg, #3D2B56 0%, #2a1d3a 100%);
      position: relative;
    }

    .dark-stats::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" opacity="0.03"><path d="M10 10 L90 10 L90 90 L10 90 Z" fill="none" stroke="white" stroke-width="0.5"/></svg>');
      pointer-events: none;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-en);
    }

    .partner-logo {
      width: 80px;
      height: 40px;
      background: rgba(255,255,255,0.15);
      border-radius: 8px;
    }

    /* FAQ 手风琴覆写 */
    .accordion-button {
      font-weight: 600;
      color: var(--secondary);
      background-color: var(--white);
      box-shadow: none;
      border-radius: var(--radius-sm) !important;
    }

    .accordion-button:not(.collapsed) {
      background-color: #fff5f3;
      color: var(--primary);
    }

    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 0.15rem rgba(255,107,91,0.2);
    }

    .accordion-item {
      border: none;
      margin-bottom: 12px;
      background: transparent;
    }

    /* CTA */
    .cta-block {
      background: var(--secondary);
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
    }

    .form-control {
      border-radius: var(--radius-sm);
      background: #f9f7f5;
      border: 1px solid var(--gray-200);
      padding: 0.8rem 1rem;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 0.15rem rgba(255,107,91,0.15);
    }

    footer {
      background: #2D2D2D;
      color: #ccc;
      font-size: 0.9rem;
    }

    footer a {
      color: #ddd;
    }

    footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .section-title {
        font-size: 1.9rem;
      }
      .navbar-collapse {
        background: white;
        padding: 1.5rem;
        border-radius: 16px;
        margin-top: 10px;
        box-shadow: var(--shadow-md);
      }
      .hero-section {
        padding: 100px 0 80px;
      }
    }