* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Open Sans', sans-serif;
  font-size: 16px;
  color: #3a3a3a;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px; /* Offset for sticky menu */
}

strong {
  font-size: inherit;
  font-weight: 700;
}

.logo img {
  height: 70%;
}

#header {
  top: 0;
  position: sticky;
  z-index: 11000;
}

header {
  height: 70px;
  font-weight: 400;
  background-color: #fcfcfc;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.1), 0 2px 10px 0 rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-width: 80%;
  height: inherit;
}

nav a, nav div {
  height: inherit;
  display: flex;
  align-items: center;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

nav ul li {
  position: relative; /* Required for dropdown positioning */
  margin: 0 10px;
}

nav ul li a {
  display: flex;
  text-decoration: none;
  padding: 10px 15px;
  border-radius: 5px;
  transition: background-color 0.3s;
}

nav ul li a:hover {
  background-color: #f2f2f2;
}

/* Dropdown Menu */
nav ul li ul.dropdown {
  display: none; /* Hide dropdown initially */
  position: absolute;
  top: 100%; /* Position below parent <li> */
  width: fit-content;
  left: 0;
  background-color: white;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  padding: 10px 0;
  z-index: 1000;
}

nav ul li ul.dropdown li {
  width: 260px; /* Set a fixed width for dropdown items */
}

nav ul li ul.dropdown li a {
  padding: 10px 15px;
  display: block;
  text-align: left;
}

nav ul li ul.dropdown li a:hover {
  background-color: #f2f2f2;
}

/* Show Dropdown on Hover */
nav ul li:hover>ul.dropdown {
  display: block; /* Show dropdown when hovering over parent <li> */
  max-height: 700px;
  overflow-y: auto;
}

footer {
  height: 40px;
  background: #3a3a3a;
  font-weight: 400;
  display: flex;
  justify-content: space-around;
  align-items: center;
}

footer a, footer p  {
  color: #eee;
  font-size: 12px;
  text-align: center;
}

.news {
  display: flex;
  flex-direction: column;
  list-style-type: none;

  /* Scroll */
  flex: 1;
  overflow-y: auto;
}

.news li {
  margin: 10px 0px;
  text-decoration: none;
  padding-right: 10px;
}

.news a,
.text-page a {
  color: #005985;
  font-weight: 600;
}

h4 a {
  font-size: inherit;
  font-weight: 700;
  text-decoration: none;
}

h4 a:hover {
  text-decoration: underline;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: calc(100vh - 70px - 40px); /* Subtracts header and footer heights */
}

.cover {
  display: flex;
  height: calc(100vh - 70px); /* subtract menu height */
  align-items: center;
  justify-content: left;
  padding-left: 25px;
  background-image: url("images/gallery/lisbon-4723518.jpg");
  background-position: center;
  background-size: cover;
  width: 100%;
}

.cover-content {
  width: 50%;
  padding: 30px 50px;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
}

/* cover-content animation */

.cover-content > * {
  opacity: 0; /* initial state - invisible*/
  transform: translateY(20px); /* initial state - element is moved down 20px */
  animation: fadeUp 0.6s ease-out forwards; /* fadeUp is the name of keyframes animation */
}

.cover-content h3 {
  animation-delay: 0.4s;
}

.cover-content h1 {
  animation-delay: 0.6s;
}

.cover-content h2 {
  animation-delay: 0.8s;
}

.cover-content h4 {
  animation-delay: 1.0s;
  font-weight: 500;
}

.cover-content .action-link {
  animation-delay: 1.2s;
}

@keyframes fadeUp {
  to {
    opacity: 1; /* fully visible */
    transform: translateY(0); /* back to original position */
  }
}

.action-link {
  background-color: #235b82; /* KR light blue */
  color: #fff;
  font-weight: 700;
  font-size: inherit;
  border-radius: 5px;
  padding: 10px 15px;
  text-decoration: none;
  margin-top: 12px;
  transition: background-color 0.3s;
}

.action-link:hover {
  background-color: #163b54; /* KR dark blue */
}

a.registration-button {
  background-color: #f36800; /* Default orange */
  color: #fff;
  font-weight: 700;
  font-size: inherit;
  border-radius: 5px;
  padding: 10px 15px;
  text-decoration: none;
  margin-top: 12px;
  transition: background-color 0.3s;
}

a.registration-button:hover {
  background-color: #e06100; /* Darker orange */
}

.content {
  background-color: rgb(247, 251, 255);
  display: flex;
  align-items: center;
  justify-content: center;
  height: calc(100vh - 70px - 40px); /* Subtract header and footer */
  padding: 45px 0px;
}

.content-left {
  height: 100%;
  display: flex;
  width: 55%;
  margin-right: 20px;
}

.content-right {
  height: 100%;
  display: flex;
  width: 30%;
}

.content-text {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 30px 45px;
  background-color: #fff;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.1), 0 2px 10px 0 rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  line-height: 1.8;

  /* Scroll */
  flex: 1;
  overflow-y: auto;
}

.content-text-borderless {
  display: flex;
  flex-direction: column;
  width: 80%;
  padding: 24px 20px;
  background-color: #fff;
  border-radius: 5px;
  line-height: 1.8;
  overflow-wrap: break-word;
}

.sponsors {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  height: auto;
  width: 100%;
  padding: 60px 0px;
}

.sponsors div {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  width: 80%;
}

.sponsors h3 {
  font-size: 35px;
  padding: 20px 0px;
}

.sponsors img {
  height: 90px;
  margin: 15px 20px;
}

main h1 {
  font-size: 46px;
  font-weight: 700;
  color: #f36800;
}

main h2 {
  font-size: 26px;
  color: #163b54; /* KR dark blue */
  font-weight: 500;
  margin: 8px 0px;
}

main h3 {
  font-size: 20px;
  color: #235b82; /* KR light blue */
  font-weight: 700;
  margin: 8px 0px;
}

main h4 {
  font-size: 18px;
  font-weight: 700;
  margin: 6px 0;
  text-align: left;
}

main p {
  margin: 8px 0;
}

.text-page {
  width: 80%;
  margin: 50px 0px;
  line-height: 1.8;
}

.text-page ul {
  margin-left: 30px;
}

.text-page ol {
  margin-left: 30px;
}

.text-page li {
  padding: 5px 0px;
}

.text-page p {
  font-weight: 400;
  margin: 15px 0;
}

.text-page h1 {
  margin: 32px 0px 10px;
  font-size: 32px;
}

.text-page h2 {
  font-size: 24px;
  margin: 24px 0px 8px;
}

.text-page h3 {
  font-size: 18px;
  margin: 18px 0px 6px;
}

.text-page h3 a {
  font-size: inherit;
  font-weight: inherit;
  text-decoration: none;
}

.text-page h3 a:hover {
  text-decoration: underline;
}

.content-box {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 10px 35px 30px 35px;
  background-color: #fff;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.1), 0 2px 10px 0 rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  margin: 15px 0px;
}

.table th {
  display: flex;
  justify-content: left;
  width: fit-content;
  margin-right: 20px;
  margin-bottom: 10px;
  text-align: left;
  vertical-align: top;
}

.table td {
  width: fit-content;
  text-align: left;
  vertical-align: top;
}

.content-group {
  display: flex;
  justify-content: space-evenly;
  flex-wrap: wrap;
}

.content-group-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(32%, 1fr));
  gap: 12px;
  margin-top: 1rem;
}

.content-group-gallery img {
  width: 100%;
  height: 40vh;
  border-radius: 8px;
  object-fit: cover;
}

.content-box-small {
  display: flex;
  width: 47%;
  max-width: 600px;
  flex-direction: column;
  padding: 5px 25px 30px 35px;
  background-color: #fff;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.1), 0 2px 10px 0 rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  margin: 15px 0px;
}

.content-text-small {
  display: flex;
  width: 33%;
  max-width: 600px;
  flex-direction: column;
  padding: 5px 25px 30px 35px;
  background-color: #fff;
  border-radius: 5px;
  margin: 15px 0px;
}

.content-group img {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  margin: 10px 10px;
  height: 46vh;
  max-width: 100%;
  border-radius: 5px;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.1), 0 2px 10px 0 rgba(0, 0, 0, 0.1);
}

.bx-menu {
  font-size: 30px;
}

.box-icon {
  display: none;
}

.overlay-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 300px;
  height: 100%;
  background-color: #fafafa;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.2);
  transition: right 0.3s ease-in-out;
  z-index: 9999;
  padding: 30px 20px;
  display: flex;
  flex-direction: column;
  overflow-y: auto; /* <-- make it scrollable */
  -webkit-overflow-scrolling: touch; /* <-- smooth scroll on iOS */
}

.overlay-menu.open {
  right: 0;
}

.overlay-menu .close-btn {
  align-self: flex-end;
  font-size: 36px;
  cursor: pointer;
}

.overlay-menu ul {
  flex: 1;
  list-style: none;
  padding: 0;
  margin: 0;
}

.overlay-menu ul li {
  margin: 15px 0;
}

.overlay-menu ul li a {
  text-decoration: none;
  color: #222;
  font-weight: 600;
}

.overlay-menu ul li ul.dropdown {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.4s ease;
  padding-left: 15px;
}

.overlay-menu ul li ul.dropdown.show {
  max-height: 1200px; /* big enough to fit submenu */
  opacity: 1;
}

.speakers {
  justify-content: flex-start;
}

.content-group .speaker-box {
  text-align: center;
  justify-content: space-evenly;
  flex-direction: row;
  padding: 30px;
}

.content-group .speaker-box h3{
  margin: 15px 0;
  text-align: left;
}

.content-group .speaker-photo {
  min-width: 180px;
  max-width: 180px;
  min-height: 190px;
  max-height: 190px;
  object-fit: cover;
  justify-content: space-evenly;
  margin-top: auto;
  margin-bottom: auto;
  margin-right: 25px;
}

.speaker-description {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 60%;
}

.speaker-description p {
  text-align: left;
  width: 100%;
  margin: 0;
}

.past-date {
  color: #888;
  text-decoration: line-through;
}

.upcoming-date {
  color: #d9534f;
  font-weight: bold;
}

.accommodations-table {
  border-collapse: collapse;
  min-width: 60%;
  max-width: 90%;
  background-color: #fff;
  margin-left: 3%;
  table-layout: fixed;
}

.accommodations-table thead tr {
  background-color: #235b82; /* KR light blue */
}

.accommodations-table th {
  padding: 12px;
  border-bottom: 1px solid #ddd;
  vertical-align: top;
  text-align: left;
  color: white;
}

.accommodations-table td {
  text-align: left;
  padding: 12px;
  border-bottom: 1px solid #ddd;
  vertical-align: top;
}

.accommodations-table tbody tr:nth-child(even) {
  background-color: #f2f2f2;
}

.accommodations-table ul {
  padding-left: 1.2em;
  margin: 0;
}

.accommodations-table li {
  margin-bottom: 5px;
}

.registration-table {
  border-collapse: collapse;
  min-width: 90%;
  max-width: 90%;
  background-color: #fff;
  margin-left: auto;
  margin-right: auto;
  table-layout: fixed;
}

.registration-table thead tr {
  background-color: #235b82; /* KR light blue */
}

.registration-table th {
  padding: 12px;
  border-bottom: 1px solid #ddd;
  color: white;
}

.registration-table td {
  text-align: center;
  padding: 12px;
  border-bottom: 1px solid #ddd;
}

.registration-table tbody tr:nth-child(even) {
  background-color: #f2f2f2;
}

.registration-table th.right-border {
  border-right: 1px solid #ddd;
}

.registration-table td:nth-child(1),
.registration-table td:nth-child(4) {
  border-right: 1px solid #ddd;
}

@media only screen and (max-width: 900px) {
  .content-text-small {
    padding: 5px;
    margin: 0px;
    width: 100%;
  }
}

@media only screen and (max-width: 1200px) {
  nav {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    padding-left: 10px;
  }

  .box-icon {
    display: flex;
    top: 10px;
    right: 20px;
  }

  nav ul {
    display: none;
  }
}

@media only screen and (max-width: 1024px) {
  main h1 {
    font-size: 34px;
  }

  main h2 {
    font-size: 20px;
  }

  .cover-content {
    min-width: 320px;
    padding: 20px;
  }

  .content-box-small {
    width: 100%;
  }

  .content {
    flex-direction: column;
    height: auto;
  }

  .content-left {
    width: 90%;
    margin: 10px 0;
  }

  .content-right {
    width: 90%;
    margin: 10px 0;
  }

  .content-group .speaker-photo {
    min-width: 110px;
    max-width: 110px;
    min-height: 140px;
    max-height: 140px;
  }

  .content-group .speaker-box {
    padding: 20px;
  }

  .content-text-borderless {
    width: 100%;
  }

  .content-group {
    justify-content: space-evenly;
  }

  .content-group-gallery {
    grid-template-columns: repeat(auto-fit, minmax(90%, 1fr));
  }

  .content-group-gallery img {
    width: 100%;
    height: auto;
  }
}