/* roulang page: index */
:root {
      --bs-primary: #D4123C;
      --bs-primary-hover: #B01030;
      --bs-secondary: #1A1A2E;
      --bs-accent: #00E5FF;
      --bs-body-bg: #F8F9FC;
      --bs-body-color: #1E1E2F;
      --bs-muted: #6B7280;
      --bs-border-color: #E5E7EB;
      --bs-light-bg: #FFFFFF;
      --bs-dark-bg: #0F0F1A;
      --bs-font-sans-serif: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --bs-font-english: "Inter", "Poppins", sans-serif;
      --bs-border-radius-lg: 12px;
      --bs-border-radius: 8px;
      --bs-box-shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --bs-box-shadow-hover: 0 12px 28px rgba(0,0,0,0.12);
      --bs-transition: all 0.25s ease;
    }

    body {
      font-family: var(--bs-font-sans-serif);
      background-color: var(--bs-body-bg);
      color: var(--bs-body-color);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

    h1 { font-weight: 700; }
    h2 { font-weight: 700; color: #1A1A2E; }
    h3 { font-weight: 600; }

    .section-title {
      margin-bottom: 0.5rem;
      font-size: 2.2rem;
    }
    .section-subtitle {
      color: var(--bs-muted);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* 导航覆盖 */
    .navbar {
      background-color: #FFFFFF;
      height: 72px;
      border-bottom: 1px solid var(--bs-border-color);
      transition: box-shadow 0.3s ease;
      padding: 0 1rem;
    }
    .navbar.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--bs-primary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--bs-font-english);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--bs-primary);
      clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
      display: inline-block;
    }
    .nav-link {
      color: #374151 !important;
      font-weight: 500;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      transition: var(--bs-transition);
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--bs-primary) !important;
      border-bottom-color: var(--bs-primary);
    }
    .search-box {
      background: #F3F4F6;
      border-radius: 20px;
      padding: 0.4rem 1rem;
      display: flex;
      align-items: center;
      gap: 6px;
      color: #9CA3AF;
      font-size: 0.9rem;
      margin-right: 1rem;
    }
    .btn-primary-custom {
      background: var(--bs-primary);
      border: none;
      border-radius: var(--bs-border-radius);
      padding: 10px 22px;
      font-weight: 600;
      color: white;
      transition: var(--bs-transition);
      white-space: nowrap;
    }
    .btn-primary-custom:hover {
      background: var(--bs-primary-hover);
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(212,18,60,0.3);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--bs-primary);
      background: transparent;
      color: var(--bs-primary);
      border-radius: var(--bs-border-radius);
      padding: 10px 22px;
      font-weight: 600;
      transition: var(--bs-transition);
    }
    .btn-outline-custom:hover {
      background: var(--bs-primary);
      color: white;
    }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--bs-border-radius);
      padding: 10px 22px;
      font-weight: 600;
      transition: var(--bs-transition);
    }
    .btn-ghost:hover {
      border-color: var(--bs-accent);
      color: var(--bs-accent);
      background: rgba(0,229,255,0.1);
    }

    /* 移动端导航 */
    @media (max-width: 767px) {
      .navbar { height: 64px; }
      .navbar-collapse { background: white; padding: 1rem; border-radius: 0 0 12px 12px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
    }

    /* Hero */
    .hero-section {
      min-height: 85vh;
      background: linear-gradient(135deg, rgba(26,26,46,0.9) 0%, rgba(15,15,26,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      max-width: 600px;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-content p {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    .hero-visual {
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: radial-gradient(circle at 30% 30%, rgba(0,229,255,0.15) 0%, transparent 60%);
      z-index: 1;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      font-size: 1.5rem;
      animation: pulse 2s infinite;
      opacity: 0.7;
    }
    @keyframes pulse {
      0% { transform: translateX(-50%) translateY(0); opacity: 0.7; }
      50% { transform: translateX(-50%) translateY(6px); opacity: 1; }
      100% { transform: translateX(-50%) translateY(0); opacity: 0.7; }
    }

    /* 痛点区 */
    .pain-points-section {
      background: linear-gradient(180deg, #EDEEF2 0%, #F8F9FC 100%);
      padding: 5rem 0;
    }
    .pain-card {
      background: #EDEEF2;
      border-left: 4px solid #9CA3AF;
      border-radius: var(--bs-border-radius-lg);
      padding: 2rem;
      transition: var(--bs-transition);
      height: 100%;
    }
    .pain-card:hover {
      border-left-color: var(--bs-primary);
      background: white;
      box-shadow: var(--bs-box-shadow-sm);
    }

    /* 解决方案 */
    .solution-step {
      display: flex;
      align-items: flex-start;
      gap: 1.5rem;
      margin-bottom: 2rem;
    }
    .step-number {
      font-family: var(--bs-font-english);
      font-size: 3rem;
      font-weight: 800;
      color: var(--bs-accent);
      line-height: 1;
      min-width: 60px;
    }

    /* 优势数据 */
    .advantage-number {
      font-family: var(--bs-font-english);
      font-size: 3rem;
      font-weight: 800;
      color: var(--bs-primary);
      line-height: 1.2;
    }

    /* 案例卡片 */
    .case-image {
      border-radius: var(--bs-border-radius-lg);
      box-shadow: var(--bs-box-shadow-sm);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--bs-border-radius-lg);
      padding: 2rem;
      box-shadow: var(--bs-box-shadow-sm);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 5rem;
      color: rgba(0,229,255,0.2);
      position: absolute;
      top: -10px;
      left: 20px;
      font-family: serif;
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, #D4123C, #1A1A2E);
      border-radius: 50%;
      display: inline-block;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #FFF5F5;
      color: var(--bs-primary);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: 0 0 0 3px rgba(0,229,255,0.2);
    }

    /* CTA 深色区 */
    .cta-dark {
      background: #1A1A2E;
      background-image: radial-gradient(circle at 20% 30%, rgba(0,229,255,0.08) 0%, transparent 50%);
    }

    /* Footer */
    .footer-section {
      background: #0F0F1A;
      color: #9CA3AF;
    }
    .footer-link {
      color: #9CA3AF;
      text-decoration: none;
      transition: var(--bs-transition);
    }
    .footer-link:hover {
      color: var(--bs-accent);
    }

    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2.2rem; }
      .hero-section { min-height: 70vh; }
      .section-title { font-size: 1.8rem; }
      .advantage-number { font-size: 2.3rem; }
    }