:root {
    --magenta: #EF22C5;
    --light-blue: #B4D4ED;
    --white: #FFFFFF;
    --black: #000000;
    --bg: #0F0F12;
    --fg: #F3F4F6;
    --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
    --font: Inter, "Helvetica Neue", Arial, system-ui, sans-serif;
    --pixel: "Press Start 2P", "Pixel Operator", monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    line-height: 1.6;
    font-size: clamp(16px, 1.8vw, 18px); 
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-synthesis: none; 
    background-color: var(--bg);
    color: var(--fg);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    scrollbar-gutter: stable both-edges;
}

.container {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
}

header {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    margin: 0;
    padding: 0;
    background: url('/images/LionENG.png') center / cover no-repeat;
}

#si{
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    margin: 0;
    padding: 0;
    background: url('/images/Artboard_2.png') center / cover no-repeat;
}


main {
    flex: 1;
    padding: 40px 0;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

.main-section {
    display: flex;
    flex-direction: row;
    align-items: left;
    padding: 40px 0px 40px;
    border-radius: 0px;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.navbar {
    position: relative;
    display: flex;
    margin-left: 20px;
    margin-top: 40px;
}

.nav-menu {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1.2em;
    list-style: none;
    width: 100%;
    margin-left: 10px;
    margin-right: 50px;
    margin-top: 40px;
}

.nav-menu a {
    color: var(--magenta);
    text-decoration: none;
    /*-webkit-text-stroke: 1px black;*/
    transition: color 0.3s ease;
    font-size: clamp(18px, 4.5vw, 1.8em);
    font-weight: 700;
    line-height: 1; 
    display: block; 
}

.nav-menu a[href="keynote-si"] .line-tight {
    line-height: 1;
    display: inline-block;
}

.nav-menu a:hover {
    color: var(--fg);
}

.nav-menu a.is-active {color: var(--fg);} 

.hamburger {
    display: none;
    background: transparent;
    border: 0;
    padding: 0px;
    margin: 15px 0px 0px 15px;
    cursor: pointer;
}

.hamburger .bar {
    display: block;
    width: 28px;
    height: 2px;
    background: var(--magenta);
    margin: 6px 0;
    transition: transform .1s ease, opacity .1s ease;
}

.content{
    margin: 40px;
    padding-left: 30px;
    position: relative;
    z-index: 1;
    max-width: 1100px;
}

.news-section {
    margin: 40px;
    position: relative;
    z-index: 1;
}

.news-section h2 {
    color: var(--light-blue);
    font-size: 1.8em;
    font-weight: 700;
    line-height: 1.6;
    margin-bottom: 40px
}

.news-section h3 {
    color: var(--light-blue); 
    color: var(--light-blue);
    font-size: 1.2em;
    font-weight: 600;
    line-height: 1.6;
}

.news-section a {
    color: var(--light-blue);
}

.programme-section {
    margin: 40px;
    position: relative;
    z-index: 1;
}

.day {
    padding: 0px 0px 60px 0px;
}

.day h2 {
    color: var(--light-blue);
    text-decoration: none;
    /*-webkit-text-stroke: 1px var(--fg);*/
    font-size: 1.8em;
    font-weight: 700;
    line-height: 1; 
    margin-bottom: 0px;
}

.day-location {
    margin: 20px auto 20px 0px;;
}

.day a {
    padding: 0px auto 40px 0px;
    color: var(--light-blue);
    text-decoration: none;
    font-size: 1.2em;
    font-weight: 600;
    line-height: 1.6; 
}

details {
    position: relative;
    margin-top: .25rem;}

summary { 
    cursor: pointer; 
}

.panel {
    margin-top: 40px;
}

.panel-name {
  font-weight: 700;
  margin-top: 40px;
}

.panel-speaker {margin-bottom: 30px;}

summary .presentation-title {
  text-decoration: underline;
  text-underline-offset: 0.15em;
  text-decoration-thickness: 0.08em;
  color: var(--light-blue);
}

summary .speaker {
  text-decoration: none;
}

details summary {
  cursor: pointer;
}

summary::marker {content: none;} /*firefox, chrome*/

summary::-webkit-details-marker {display: none;} /*safari*/

.abstract {
    max-width: 900px;
    margin: 20px auto 20px 40px;
    position: relative;
    font-size: 1.1rem;
    text-align: justify;
}

.bio {
    max-width: 900px;
    margin: 0px auto 20px 40px;
    position: relative;
    font-size: 1.1rem;
    text-align: justify;
}

.bio .details-close {
    background: none;
    border: none;
    font: inherit;
    line-height: 1;
    cursor: pointer;
    color: var(--light-blue);
    font-size: 1.7rem;
}

.bio .details-close:focus-visible {
    outline: 2px solid currentColor;
    border-radius: .25rem;
}

/*
.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  width: 100%;
  opacity: 0;
  transition: .5s ease;
  background-color: rgba(var(--dark-purple-rgb), 0.95);
}

.news-content:hover .overlay {
  opacity: 1;
}

.overlay-text {
  color: white;
  font-size: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
}

.events {
    position: relative;
    display: block;
    padding: 0px 0px 40px 0px;
    margin-bottom: 20px;
    text-decoration: none;
}

.events h3 {
    color: var(--fg);
}

.events p {
    color: var(--fg);
}*/

.keynote-content {
    margin-bottom: 40px;
}

.keynote-content h2 {
    color: var(--light-blue);
    text-decoration: none;
    /*-webkit-text-stroke: 1px var(--fg);*/
    font-size: 1.8em;
    font-weight: 700;
    line-height: 1.6;
    margin-bottom: 40px;
}

.keynote-content h3 {
    padding: 0px auto 40px 0px;
    color: var(--light-blue);
    text-decoration: none;
    font-size: 1.2em;
    font-weight: 600;
    line-height: 1.6; 
}

.keynote-content a {
    padding: 0px auto 40px 0px;
    color: var(--light-blue);
    text-decoration: none;
    font-size: 1.2em;
    font-weight: 600;
    line-height: 1.6; 
}

.keynote-grid img {
    width: 200px;
    height: auto;
}

.venues-content {
    margin-bottom: 30px;
}

.venue-map iframe {
    width: 100%;
    height: 300px;
    border: 0;
    border-radius: 8px;
}

.credits-content {
    margin-bottom: 30px;
}

.contacts h3 a {
    color: var(--fg);
    text-decoration: none;
    font-size: 1em;
    font-weight: 600;
}

.archive-content {
    margin-bottom: 30px;
}

.archive-content a {
    text-decoration: none;
}

footer {
    position: relative;
    padding: 0px 0;
    margin: 0 auto;
    width: 100%;
    background-color: var(--bg);
}

hr.footer-line {
    border: 0;
    height: 0.8px;
    background: var(--magenta);
    background-image: linear-gradient(to left, #ccc, var(--magenta));
}

.footer-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    width: 100%;
    max-width: 1800px;
    margin: 5px auto 0px;
    padding: 0px;
    gap: 2rem;
}

.footer-container a {
    display: inline-block;
}

.footer-logos img {
    vertical-align: middle;
    height: 50px;
    width: auto;
}

.footer-logos #fb {
    height: 30px;
    width: auto;
}

@media (max-width: 1024px) {
  .main-section {flex-direction: column; padding: 24px 0; }
  .content {margin: 16px;}
}

@media (max-width: 900px) {
  .hamburger {display: block;}
  .nav-menu {
    display: none;
    position: relative;
    margin: 0 16px 16px;
    padding: 12px 0;
    gap: 0.8em;
    background: transparent;
  }
  .nav-menu.open {display: flex;}
  .nav-menu li {margin: 0;}
}

@media (max-width: 600px) {
    header {aspect-ratio: 2 / 1,12;} 
    main { 
        padding: 0px; 
        margin-bottom: 20px}
    .navbar {
        margin: 0px;
    }
    .nav-menu {
        display: none;
        position: relative;
        margin-top: 30px;
        padding: 0px;
        gap: 0.5em;
        background: transparent;
    }
    .content {
        margin: 30px; 
        padding: 0px;}
    .main-section {
        padding: 0px; 
        margin: 0px}
    .news-section, .programme-section {
        margin: 0px; 
        padding: 0px;}   
    .keynote-content, .archive-content, .venues-content, .credits-content {
        margin: 0px 0px 10px 0px;
        padding: 0px;
    } 
    .keynote-content a {margin-bottom: 40px;}
    .abstract, .bio {
        margin: 12px 0 12px 5px; 
        font-size: 1rem;}
    .footer-logos img {
    height: 30px;
    width: auto;
    }
    .footer-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
      padding: 8px 10px;
    }
    hr.footer-line {
    background: var(--magenta);
}
}

.hamburger.active .bar:nth-child(2) { opacity: 0; }
.hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }