:root {
  --base-font-size: 1rem;
  --aws-blue: #41B3FF;
  --aws-dark: #161D26;
  --aws-light: #F3F3F7;
  --aws-purple: #AD5CFF;
  --aws-orange: #FF693C;
  --aws-yellow: #FBD332;
}

* {
  margin: 0;
  padding: 0;
  font-family: "Amazon Ember", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1em;
  box-sizing: border-box;
}

h1 {
  font-size: 2.6rem;
  font-family: "Amazon Ember Heavy", "Amazon Ember", sans-serif;
  font-weight: 700;
}

h2 {
  margin: 4rem 0 2rem;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--aws-dark);
}

h3 {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--aws-dark);
}

ul, ol, p, li {
  color: var(--aws-dark);
  font-size: var(--base-font-size);
  margin: 0 0 0.8rem;
  line-height: calc(var(--base-font-size) * 1.5);
}

ul:empty, ol:empty, p:empty, li:empty {
  display: none;
}

ul, ol {
  padding: 0 0 0 1.4rem;
}

li {
  padding-left: 0.5rem;
  margin: 0.2rem 0;
}

p:first-child, ul:first-child, li:first-child {
  margin-top: 0;
}

p:last-child, ul:last-child, li:last-child {
  margin-bottom: 0;
}

a, a:link, a:visited {
  color: var(--aws-blue);
  text-decoration: underline;
}

a:hover, a:focus {
  color: #2074d5;
}

strong {
  font-weight: bold;
}

pre {
  background: var(--aws-light);
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1rem;
  margin: 1rem 0;
  overflow-x: auto;
}

code {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
}

.wrapper {
  margin: 1rem auto;
  max-width: 60rem;
  padding: 1rem;
}

header, footer {
  background: var(--aws-dark);
  overflow: hidden;
}

header img, footer img {
  height: 2rem;
}

header h1, footer h1 {
  color: #fff;
  margin: 2rem 0 0;
  padding: 0;
}

header p, footer p {
  color: var(--aws-light);
  font-size: 1.3rem;
  font-weight: bold;
  margin-top: 1rem;
}

header a, header a:link, header a:visited, header a:hover, header a:active, header a:focus,
footer a, footer a:link, footer a:visited, footer a:hover, footer a:active, footer a:focus {
  color: #fff;
  text-decoration: underline;
}

header a:hover, header a:active, header a:focus,
footer a:hover, footer a:active, footer a:focus {
  color: #ddd;
}

main, footer p {
  margin: 3rem auto;
  max-width: 80rem;
}

.presenters, .links {
  padding: 0;
}

.presenters li, .links li {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: flex;
  flex-direction: row;
  align-items: center;
}

.presenters li > div, .links li > div {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.presenters li img, .links li img {
  display: block;
  height: 48px;
  width: 48px;
  border-radius: 5%;
  margin-right: 1.5rem;
}

.presenters {
  padding: 0;
}

.presenters li img {
  height: 100px;
  width: 100px;
  border-radius: 50%;
}

.presenters li a {
  display: inline-block;
  margin: 0 0.3rem 0 0;
}

.feedback {
  border: 1px solid var(--aws-orange);
  background: #fff4e4;
  margin: 4rem 0;
  padding: 1rem;
  border-radius: 8px;
}

.feedback p:first-child {
  margin-bottom: 0.2rem;
}

.agenda {
  margin: 2rem 0;
}

.agenda-item {
  display: flex;
  margin: 1.5rem 0;
  padding: 1rem;
  border-left: 3px solid var(--aws-blue);
  background: var(--aws-light);
  border-radius: 0 8px 8px 0;
}

.agenda-item .time {
  font-weight: bold;
  color: var(--aws-dark);
  min-width: 140px;
  margin-right: 1.5rem;
}

.agenda-item .content {
  flex: 1;
}

.tab-button {
  background: var(--aws-light);
  border: 1px solid #ddd;
  color: var(--aws-dark);
  padding: 10px 20px;
  margin-right: 5px;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  font-weight: 500;
  transition: all 0.3s ease;
}

.tab-button:hover {
  background: #e8e8ec;
}

.tab-button.active {
  background: var(--aws-blue);
  color: white;
  border-color: var(--aws-blue);
}

.register-btn {
  display: inline-block;
  background: var(--aws-orange);
  color: white !important;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none !important;
  font-weight: 600;
  margin-top: 1.5rem;
  transition: background 0.3s ease;
}

.register-btn:hover {
  background: #e55a2b;
  color: white !important;
}

footer p {
  padding: 0.6rem;
  font-size: 0.8rem;
  text-align: center;
  font-weight: normal;
}

.centered-image {
  text-align: center;
  margin: 2rem 0;
}