@media screen and (max-width: 37.5em) { /* 600px */
  .tabs ul.primary {
    border-bottom: 1px solid #bbb;
  }
  .tabs ul.primary li {
    display: block;
    margin: 0;
  }
  .tabs ul.primary li a {
    padding: 5px 10px;
  }
  .tabs ul.primary li.is-active a {
    border-bottom: none;
  }
}

@media screen and (min-width: 37.5em) { /* 600px */
  .tabs ul.primary {
    overflow: hidden;
    height: auto;
    margin: 0;
    padding: 0 3px;
    white-space: nowrap;
    border: none;
    border-collapse: collapse;
    background: transparent url(../images/tabs-border.png) repeat-x left bottom;
    line-height: normal;
  }
  .tabs ul.primary li {
    display: block;
    float: left; /* LTR */
    margin: 0 5px 0 0; /* LTR */
    vertical-align: bottom;
  }
  [dir="rtl"] .tabs ul.primary li {
    float: right;
    margin: 0 0 0 5px;
  }
  .tabs ul.primary li a {
    float: left; /* not LTR */
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
  }
  .tabs ul.primary li.is-active a {
    border-bottom: 1px solid #fff;
  }
}

@media (max-width: 900px) {
    .path-frontpage .hero-section {
        height: 222px;
    }
    
    #block-pagetitle {
        min-height: 120px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    h1.page-title {
        font-size: 1.8rem;
        line-height: 1.8rem;
        margin: 0 0 6px 0;
    }
     
    .header-container {
        flex-direction: column;
        padding: 0 0;
        gap: 6px;
    }
    
    ul.menu {
         margin-left: 0;
    }
    
    .menu {
        justify-content: center;
        gap: 0.5rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
        margin-bottom: 10px;
    }
    
    .key-message-section, .research-areas {
	padding: 16px 0;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 10px;
    }
    
    .featured-system {
        padding: 20px 0;
    }
    
    .featured-system .container {
	padding: 0 12px;
    }
    
    #block-frontheadertext {
        width: 100%;
    }
    
    .featured-card {
        padding: 14px 24px;
        margin-bottom: 12px;
    }
    
    .region-feature {
        margin: 0 0;
    }
    
    .featured-title {
        font-size: 1.4rem;
        line-height: 1.5rem;
    }
    
    .message-large {
        font-size: 1.4rem;
    }
    
    .page-title {
        font-size: 2.2rem;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }

    .impsi-advisory-grid {
        grid-template-columns: 1fr;
    }

    .impsi-advisor-image {
        height: 220px;
    }

    .impsi-advisory-intro {
        font-size: 1.2rem;
    }

    .impsi-partners-grid {
        grid-template-columns: 1fr;
    }

    .impsi-partners-title {
        font-size: 1.8rem;
    }

    .impsi-partners-intro {
        font-size: 1.2rem;
    }

    .impsi-partners-cta {
        margin-bottom: 40px;
    }

    .impsi-top-grid,
    .impsi-model-layout,
    .impsi-cards-grid,
    .impsi-approach-grid,
    .impsi-model-left {
        grid-template-columns: 1fr;
        gap: 0px;
    }

    .impsi-cards-grid {
	gap: 6px;
    }
    
    .impsi-model-diagram {
        width: 100%;
        max-width: 420px;
        height: auto;
    }

    .impsi-section-title {
        margin: 6px 0;
    }
    
    .impsi-section-title::before {
	display: none;
    }
    
    .impsi-section-title span {
        font-size: 1.6rem;
    }

    .impsi-heading span {
        font-size: 1.6rem;
    }

    .impsi-heading {
        margin-top: 0px;
    }

    .impsi-cta-grid {
        grid-template-columns: 1fr;
        margin-bottom: 20px;
    }

    .impsi-cta-intro {
        font-size: 1.5rem;
        margin-bottom: 40px;
    }

    .impsi-engage h2 {
        font-size: 2rem;
    }

    .impsi-action-content p {
        min-height: auto;
    }

    .impsi-services-grid {
        grid-template-columns: 1fr;
    }

    .impsi-service-description {
        padding-left: 0;
    }

    .impsi-library-grid {
        grid-template-columns: 1fr;
    }

    .impsi-library-tabs {
        flex-wrap: wrap;
    }

    .impsi-report-content h3 {
        font-size: 1.6rem;
    }

    .impsi-subsection-title span {
        font-size: 1.8rem;
    }

    .impsi-report-image {
        height: 240px;
    }
    
    #block-headerimage {
        display: none;
    }
    
    .hero-section {
        padding: 6px 0;
    }
    
    .region-content {
        padding-top: 6px;
    }
    
    .impsi-cta-section {
        padding-top: 0px;
    }
    
    .featured-image {
        margin: 0;
        width: 100%;
    }

    .featured-image img {
        width: 100%;
    }
    
    .impsi-advisory-board {
        padding-top: 0px;
    }
    
    .impsi-divider {
       display: none;
    }
    
    .impsi-about-header {
       margin-bottom: 16px;
    }

    .impsi-heading {
	margin: 6px 0;
    }
    
    .impsi-card {
       margin-bottom: 6px;
    }
}