:root {
  --navy:        #1c2e4a;
  --navy-mid:    #24395e;
  --blue:        #3b78c4;
  --blue-light:  #ebf2fb;
  --teal:        #2a9080;
  --teal-light:  #e3f5f1;
  --amber:       #c97a2a;
  --amber-light: #fdf0e3;
  --gold:        #a0882a;
  --gold-light:  #faf6e2;
  --text:        #1f2937;
  --muted:       #6b7280;
  --border:      #e4e7ec;
  --bg:          #f7f8fb;
  --white:       #ffffff;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ── HEADER ── */

header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  color: #fff;
  padding: 3rem 0 2.75rem;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--teal) 100%);
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
}

header h1 a {
  color: #fff;
  text-decoration: none;
}

header .tagline {
  color: rgba(255, 255, 255, 0.65);
  font-size: 1rem;
  font-weight: 400;
  max-width: 560px;
  line-height: 1.5;
}

/* ── MAIN ── */

main {
  padding: 0 0 5rem;
  min-height: 60vh;
}

/* ── HEADINGS ── */

h2 {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 3rem 0 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

h2:first-child {
  margin-top: 0;
}

p {
  margin-bottom: 0.6rem;
}

strong {
  color: var(--navy);
  font-weight: 600;
}

a {
  color: var(--blue);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

a:hover {
  opacity: 0.75;
}

/* ── SPONSOR LOGOS ── */

.sponsor-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  margin: 0.25rem 0 2rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
}

.sponsor-logos {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.sponsor-intro {
  font-size: 0.95rem;
  color: var(--text);
  margin: 0;
  align-self: flex-start;
}

.sponsor-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.logo-wrap {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-ims,
.logo-ri {
  max-height: 70px;
  width: auto;
  max-width: 220px;
  display: block;
}

.sponsor-name {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  text-align: center;
  white-space: nowrap;
}

.sponsor-grant {
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
  white-space: nowrap;
}

@media (max-width: 600px) {
  .sponsor-logos {
    flex-direction: column;
    gap: 1.5rem;
  }
  .logo-ims { height: 55px; }
  .logo-ri  { height: 55px; }
}

/* ── WORKSHOP DETAILS ── */

.details-block {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.4rem 1.75rem;
  display: grid;
  gap: 0.55rem;
}

.details-block p {
  margin: 0;
  font-size: 0.95rem;
}

.prep-list {
  margin: 0;
  padding-left: 1.75rem;
  display: grid;
  gap: 0.4rem;
  font-size: 0.95rem;
}

/* ── SCHEDULE ── */

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 0.25rem 0;
}

.day-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.05);
}

.day-header {
  background: var(--navy);
  color: #fff;
  padding: 0.75rem 1rem;
  text-align: center;
}

.day-name {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
}

.day-date {
  display: block;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
  margin-top: 0.1rem;
}

.event-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.event-item {
  padding: 5px 1rem;
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  box-sizing: border-box;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.event-item:last-child {
  border-bottom: none;
}

.event-time {
  display: block;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  line-height: 1.3;
}

.event-title {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}

.schedule-offset {
  box-sizing: border-box;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 4px,
    rgba(0, 0, 0, 0.025) 4px,
    rgba(0, 0, 0, 0.025) 5px
  );
  border-bottom: 1px dashed var(--border);
  display: flex;
  align-items: center;
  padding: 0 1rem;
}

.schedule-offset span {
  font-size: 0.6rem;
  color: #c5c9d1;
  font-style: italic;
}

/* Event type variants */
.event-lecture {
  border-left-color: var(--blue);
  background: var(--blue-light);
}
.event-lecture .event-title {
  color: var(--navy);
}

.event-handson {
  border-left-color: var(--teal);
  background: var(--teal-light);
}
.event-handson .event-title {
  color: var(--text);
}

.event-break,
.event-lunch {
  border-left-color: var(--gold);
  background: var(--gold-light);
}
.event-break .event-title,
.event-lunch .event-title {
  color: var(--text);
  font-weight: 500;
}

.event-social {
  border-left-color: var(--gold);
  background: var(--gold-light);
}
.event-social .event-title {
  color: var(--text);
}

/* ── ORGANIZERS ── */

.organizer-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.25rem 0 3rem;
}

.organizer-list li a {
  display: inline-block;
  padding: 0.38rem 0.95rem;
  border: 1px solid var(--blue);
  border-radius: 100px;
  color: var(--blue);
  font-size: 0.88rem;
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease;
}

.organizer-list li a:hover {
  background: var(--blue);
  color: #fff;
  opacity: 1;
}

/* ── FOOTER ── */

footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
  padding: 1.5rem 0;
  font-size: 0.82rem;
}

/* ── RESPONSIVE ── */

@media (max-width: 720px) {
  header h1 { font-size: 2rem; }
  .schedule-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .schedule-grid { grid-template-columns: 1fr; }
  header { padding: 2rem 0; }
}