/* roulang page: index */
:root {
      --primary: #E8453A;
      --primary-dark: #C0392B;
      --secondary: #F6A623;
      --dark-bg: #1E1E24;
      --light-bg: #FAFAFA;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5A5A5A;
      --text-weak: #8A8A8A;
      --border-light: #E0E0E0;
      --border-card: #EEEEEE;
      --success: #2ECC71;
      --warning: #E74C3C;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-weight: 600;
    }
    h1, h2, h3, h4 {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      line-height: 1.3;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      font-weight: 600;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
    }
    .section {
      padding: 80px 0;
    }
    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      gap: 24px;
    }
    .logo {
      font-family: 'Inter', system-ui, sans-serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo small {
      font-size: 12px;
      font-weight: 400;
      color: var(--text-weak);
      margin-left: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .search-wrapper {
      flex: 1;
      max-width: 40%;
      min-width: 200px;
      position: relative;
    }
    .search-box {
      width: 100%;
      height: 44px;
      border-radius: var(--radius-pill);
      border: 1px solid var(--border-light);
      padding: 0 48px 0 20px;
      font-size: 15px;
      background: white;
      transition: all 0.25s;
      outline: none;
      font-family: inherit;
    }
    .search-box:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(232,69,58,0.15);
    }
    .search-icon {
      position: absolute;
      right: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-weak);
      font-size: 18px;
      pointer-events: none;
    }
    .mobile-menu-toggle {
      display: none;
      font-size: 24px;
      color: var(--text-main);
      background: none;
      border: none;
    }
    .mobile-search-icon {
      display: none;
      font-size: 22px;
      color: var(--text-secondary);
    }
    /* Hero */
    .hero {
      background: var(--dark-bg);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-dots {
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 20% 30%, rgba(246,166,35,0.15) 1px, transparent 1px);
      background-size: 40px 40px;
      animation: dotPulse 3s infinite alternate;
    }
    @keyframes dotPulse {
      0% { opacity: 0.5; }
      100% { opacity: 0.9; }
    }
    .hero-grid {
      position: absolute;
      inset: 0;
      background: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
                  linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 60px 60px;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 52px;
      margin-bottom: 20px;
      color: white;
    }
    .hero .subtitle {
      font-size: 20px;
      color: #B0B0B0;
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(232,69,58,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 50px;
      flex-wrap: wrap;
    }
    .stat-item {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 20px 28px;
      color: white;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--secondary);
    }
    /* 板块共用 */
    .section-title {
      margin-bottom: 48px;
    }
    .section-title h2 {
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 700px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--primary);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(232,69,58,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s;
    }
    .text-link i {
      font-size: 14px;
    }
    .text-link:hover {
      gap: 10px;
      text-decoration: underline;
    }
    .asymmetric-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 24px;
    }
    .right-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .pain-list {
      list-style: none;
    }
    .pain-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 17px;
      color: var(--text-main);
    }
    .pain-icon {
      color: var(--warning);
      font-size: 18px;
      margin-top: 2px;
    }
    .bg-soft {
      background: #F2F2F2;
    }
    .testimonial-card {
      background: #F5F5F5;
      border-radius: var(--radius-card);
      padding: 28px;
      position: relative;
      border-left: 4px solid var(--primary);
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #DDD;
      margin-bottom: 16px;
    }
    .stars {
      color: var(--secondary);
      letter-spacing: 2px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-card);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 600;
      background: transparent;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding: 0 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.active {
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }
    .cta-dark {
      background: var(--dark-bg);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }
    .btn-outline-light {
      border: 1px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      background: transparent;
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.1);
    }
    .footer {
      background: #1A1A1E;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 18px;
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 16px;
      }
      .search-wrapper {
        max-width: 30%;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .section { padding: 48px 0; }
      .nav-links, .search-wrapper {
        display: none;
      }
      .mobile-menu-toggle, .mobile-search-icon {
        display: block;
      }
      .mobile-search-active .search-wrapper {
        display: block;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        max-width: 100%;
        background: white;
        padding: 12px 24px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.05);
      }
      .grid-2, .asymmetric-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        flex-direction: column;
        gap: 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }