:root {
  --mit-red: #a31f34;
  --mit-gray: #8c8c8c;
  --mit-dark-gray: #53565a;
  --mit-light-gray: #c4c4c4;
  --mit-bg: #f8f9fa;
  --mit-white: #ffffff;
  --mit-black: #000000;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Source Sans Pro", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--mit-black);
  background: var(--mit-white);
  line-height: 1.6;
}

.container { width: min(1120px, 92%); margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--mit-white);
  border-bottom: 3px solid var(--mit-red);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.brand {
  color: var(--mit-black); text-decoration: none; font-weight: 700; letter-spacing: 0.5px;
  font-family: "Source Sans Pro", sans-serif;
}
.brand-logo { height: 40px; vertical-align: middle; margin-right: 12px; }
.nav-toggle { display: none; background: transparent; border: 0; font-size: 24px; color: var(--mit-red); }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 24px; }
.site-nav a { color: var(--mit-dark-gray); text-decoration: none; font-weight: 600; text-transform: uppercase; font-size: 14px; letter-spacing: 0.5px; }
.site-nav a:hover { color: var(--mit-red); }

.hero {
  background: var(--mit-bg);
  padding: 80px 0;
  text-align: center;
}
.hero-content { max-width: 800px; margin: 0 auto; }
.mit-logo {
  margin-bottom: 24px;
  font-family: "Source Sans Pro", sans-serif;
  font-weight: 700;
}
.mit-text {
  font-size: 48px;
  color: var(--mit-red);
  letter-spacing: 2px;
}
.sloan-text {
  font-size: 24px;
  color: var(--mit-dark-gray);
  margin-left: 8px;
  letter-spacing: 1px;
}
.hero h1 { 
  font-size: clamp(32px, 5vw, 56px); 
  margin: 0 0 16px; 
  color: var(--mit-black);
  font-weight: 300;
  letter-spacing: 1px;
}
.subtitle { 
  color: var(--mit-gray); 
  font-size: 20px; 
  margin: 0 0 32px; 
  font-weight: 400;
  font-style: italic;
}
.event-details {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin: 32px 0;
  padding: 24px 0;
  border-top: 1px solid var(--mit-light-gray);
  border-bottom: 1px solid var(--mit-light-gray);
}
.detail-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.detail-label {
  font-size: 12px;
  color: var(--mit-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}
.detail-value {
  font-size: 18px;
  color: var(--mit-black);
  font-weight: 600;
}
.hero-cta { display: flex; gap: 16px; margin-top: 32px; flex-wrap: wrap; justify-content: center; }

.btn { 
  display: inline-block; 
  border: 2px solid var(--mit-red); 
  color: var(--mit-red); 
  padding: 12px 24px; 
  border-radius: var(--radius); 
  text-decoration: none; 
  font-weight: 600; 
  background: var(--mit-white);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 14px;
  transition: all 0.2s ease;
}
.btn:hover {
  background: var(--mit-red);
  color: var(--mit-white);
}
.btn.primary { 
  background: var(--mit-red); 
  color: var(--mit-white); 
  border-color: var(--mit-red);
}
.btn.primary:hover {
  background: var(--mit-dark-gray);
  border-color: var(--mit-dark-gray);
}
.btn.full { display: block; width: 100%; text-align: center; }
.btn.small { padding: 8px 16px; font-size: 12px; }

/* Confetti (fun) */
.confetti-piece {
  position: fixed;
  width: 8px;
  height: 12px;
  border-radius: 2px;
  pointer-events: none;
  will-change: transform, opacity;
  transform: translate3d(0,0,0);
  animation: confetti-fall var(--dur,1.2s) ease-out forwards;
}

@keyframes confetti-fall {
  to {
    transform: translate3d(var(--dx, 0px), var(--dy, 720px), 0) rotate(var(--rot, 720deg));
    opacity: 0;
  }
}

.section { padding: 80px 0; }
.section.alt { background: var(--mit-bg); }
.grid.two { display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; align-items: start; }

.bullets { padding-left: 18px; }
.bullets li { margin: 6px 0; }

.card { 
  background: var(--mit-white); 
  border: 1px solid var(--mit-light-gray); 
  border-radius: var(--radius); 
  padding: 24px; 
  box-shadow: var(--shadow);
}

.map-embed iframe { width: 100%; height: 280px; border: 0; border-radius: 10px; }

.controls { display: flex; justify-content: flex-end; margin-bottom: 12px; }
.filter { display: inline-flex; gap: 8px; align-items: center; color: var(--mit-gray); }

.accordion details { border: 1px solid var(--mit-light-gray); border-radius: var(--radius); padding: 10px 14px; background: var(--mit-white); margin-bottom: 10px; }
.accordion summary { cursor: pointer; font-weight: 700; }
.timeline { list-style: none; padding: 0; margin: 10px 0 0; }
.timeline li { padding: 10px 0; border-bottom: 1px dashed var(--mit-light-gray); display: flex; gap: 12px; }
.timeline time { font-weight: 700; color: var(--mit-dark-gray); width: 64px; flex: 0 0 64px; }

.steps { padding-left: 18px; }
.steps li { margin: 8px 0; }

.highlights-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.media-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.media-grid img { width: 100%; height: 220px; object-fit: cover; border-radius: 10px; display: block; }
.media-grid figure { margin: 0; }
.media-grid figcaption { margin-top: 8px; color: var(--mit-gray); font-size: 14px; }
.video-embed { position: relative; padding-top: 56.25%; border-radius: 10px; overflow: hidden; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

form label { display: grid; gap: 6px; margin-bottom: 12px; font-weight: 600; color: var(--mit-dark-gray); }
input, textarea, select { 
  font: inherit; 
  padding: 12px 16px; 
  border-radius: var(--radius); 
  border: 1px solid var(--mit-light-gray); 
  background: var(--mit-white);
  color: var(--mit-black);
  transition: border-color 0.2s ease;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--mit-red);
}
.form-hint { color: var(--mit-gray); font-size: 12px; margin-top: 8px; }

.site-footer { border-top: 1px solid var(--mit-light-gray); padding: 24px 0; background: var(--mit-white); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.disclaimer-section {
  background: var(--mit-bg);
  border-top: 2px solid var(--mit-red);
}

.disclaimer-section h2 {
  text-align: center;
}

.disclaimer-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}
.disclaimer-content h3 {
  color: var(--mit-red);
  margin: 32px 0 16px;
  font-size: 18px;
  font-weight: 600;
}
.disclaimer-list {
  padding-left: 20px;
  margin: 16px 0;
}
.disclaimer-list li {
  margin: 8px 0;
  line-height: 1.6;
}
.disclaimer-content p {
  margin: 16px 0;
  line-height: 1.7;
}

.luma-embed {
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
}
.luma-embed iframe {
  width: 100%;
  height: 450px;
  border: 0;
}
.luma-checkout--button {
  margin-top: 16px;
}

.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}
.organizer-card {
  background: var(--mit-white);
  border: 1px solid var(--mit-light-gray);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.organizer-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.organizer-photo {
  margin-bottom: 16px;
}
.organizer-photo img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--mit-light-gray);
}
.organizer-info h3 {
  margin: 0 0 8px;
  color: var(--mit-black);
  font-size: 20px;
  font-weight: 600;
}
.organizer-title {
  color: var(--mit-red);
  font-weight: 600;
  margin: 0 0 4px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.organizer-cohort {
  color: var(--mit-gray);
  margin: 0 0 16px;
  font-size: 14px;
}
.organizer-linkedin {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mit-red);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: 8px 16px;
  border: 1px solid var(--mit-red);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}
.organizer-linkedin:hover {
  background: var(--mit-red);
  color: var(--mit-white);
}
.organizers-note {
  text-align: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--mit-light-gray);
}
.organizers-note p {
  color: var(--mit-gray);
  font-style: italic;
}

.policy-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}
.policy-content h3 {
  color: var(--mit-red);
  margin: 32px 0 16px;
  font-size: 18px;
  font-weight: 600;
}
.policy-list {
  padding-left: 20px;
  margin: 16px 0;
}
.policy-list li {
  margin: 12px 0;
  line-height: 1.7;
}
.policy-content p {
  margin: 16px 0;
  line-height: 1.7;
}
.policy-note {
  background: var(--mit-bg);
  border-left: 4px solid var(--mit-red);
  padding: 20px;
  margin: 32px 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.policy-note p {
  margin: 0;
  color: var(--mit-dark-gray);
  font-style: italic;
}

.policy-section h2{
  text-align: center;
}

@media (max-width: 900px) {
  .grid.two { grid-template-columns: 1fr; }
  .highlights-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .event-details { gap: 24px; }
  .mit-text { font-size: 36px; }
  .sloan-text { font-size: 18px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .site-nav { display: none; position: absolute; top: 64px; right: 4%; background: var(--mit-white); border: 1px solid var(--mit-light-gray); border-radius: var(--radius); box-shadow: var(--shadow); }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; padding: 16px; gap: 8px; }
  .hero { padding: 60px 0; }
  .event-details { flex-direction: column; gap: 16px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-cta .btn { width: 200px; }
}

#schedule-accordion details {
  border: 0;
}