/* roulang page: index */
:root {
      --primary-deep: #1A1A1A;
      --primary-green: #00C896;
      --accent-amber: #FFB800;
      --ice-white: #F5F7FA;
      --text-heading: #111111;
      --text-body: #444444;
      --text-light: #F0F0F0;
      --white: #FFFFFF;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
      --gradient-brand: linear-gradient(135deg, #00C896 0%, #1A1A1A 100%);
      --radius-card-lg: 16px;
      --radius-card-sm: 12px;
      --radius-btn: 50px;
      --radius-input: 8px;
      --transition-base: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      color: var(--text-heading);
      font-weight: 700;
    }
    h1 {
      font-size: 3rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.4rem;
    }
    .section-title {
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60%;
      height: 4px;
      background: var(--primary-green);
      border-radius: 4px;
    }
    .text-green {
      color: var(--primary-green);
    }
    .bg-ice {
      background-color: var(--ice-white);
    }
    /* 导航栏 - 悬浮胶囊 */
    .navbar-custom {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: 94%;
      max-width: 1200px;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 0.5rem 2rem;
      box-shadow: 0 10px 30px rgba(0,0,0,0.05);
      z-index: 1050;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition-base);
    }
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.3rem;
      letter-spacing: 0.5px;
    }
    .navbar-brand-custom i {
      font-size: 2rem;
      color: var(--primary-green);
    }
    .nav-link-custom {
      color: var(--text-body);
      font-weight: 500;
      margin: 0 0.6rem;
      position: relative;
      text-decoration: none;
      transition: color 0.2s;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary-green);
      transition: transform 0.25s ease;
    }
    .nav-link-custom:hover {
      color: var(--primary-green);
    }
    .nav-link-custom:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .btn-primary-custom {
      background: var(--gradient-brand);
      border: none;
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: 0.3s;
      box-shadow: 0 4px 12px rgba(0,200,150,0.3);
    }
    .btn-primary-custom:hover {
      box-shadow: 0 0 18px rgba(0,200,150,0.5);
      filter: brightness(1.1);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-green {
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline-green:hover {
      background: var(--primary-green);
      color: white;
    }
    /* 移动端导航 */
    @media (max-width: 991px) {
      .navbar-custom {
        border-radius: 24px;
        padding: 0.5rem 1.2rem;
        top: 10px;
        background: rgba(255,255,255,0.95);
      }
      .navbar-mobile-collapse {
        position: absolute;
        top: 75px;
        left: 50%;
        transform: translateX(-50%);
        width: 90%;
        background: white;
        border-radius: 28px;
        box-shadow: 0 20px 35px rgba(0,0,0,0.1);
        padding: 1.5rem;
        display: none;
        flex-direction: column;
        gap: 1rem;
      }
      .navbar-mobile-collapse.show {
        display: flex;
      }
    }
    /* Hero 区域 */
    .hero-section {
      padding: 10rem 0 5rem;
      background: linear-gradient(180deg, #ffffff 0%, #f9fafc 100%);
    }
    .hero-badge {
      background: white;
      border-radius: 40px;
      padding: 0.5rem 1.5rem;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--primary-deep);
    }
    .data-badge {
      background: white;
      border-radius: 16px;
      padding: 1.2rem 1.6rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .data-badge .number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary-green);
      line-height: 1.1;
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      filter: brightness(0.95);
    }
    .pain-card {
      background: #f2f4f8;
      border-radius: 20px;
      padding: 1.8rem;
      border-left: 5px solid #b0b0b0;
    }
    .solution-card {
      background: var(--gradient-brand);
      border-radius: var(--radius-card-lg);
      padding: 2rem;
      color: white;
      transition: var(--transition-base);
      height: 100%;
    }
    .solution-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-hover);
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card-sm);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }
    .accordion-button:not(.collapsed) {
      background-color: rgba(0,200,150,0.05);
      color: var(--primary-deep);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary-green);
    }
    .footer-dark {
      background: #1A1A1A;
      color: #cccccc;
    }
    .footer-dark a {
      color: #dddddd;
      text-decoration: none;
    }
    .footer-dark a:hover {
      color: var(--primary-green);
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      .data-badge .number { font-size: 2rem; }
    }