/* Custom Pantone-Inspired Color Palette */
:root {
  --transparent-yellow: #F5EFC6;
  --sceptre-red: #4D0E12;
  --cerulean-blue: #A5BCD6;
  --potting-soil: #4A2E27;
  --java-brown: #231815;
}

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

body {
  min-height: 100vh;
  background-color: #7f7f7f;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Plus Jakarta Sans', sans-serif;
  padding: 20px;
}

/* CARD CONTAINER */
.lecture-card {
  background: #ffffff;
  width: 100%;
  max-width: 880px;
  border-radius: 28px;
  padding: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
}

/* HEADER & BACK BUTTON */
.back-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid #d0e0f0;
  border-radius: 12px;
  padding: 6px 12px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--java-brown);
  cursor: pointer;
  transition: all 0.2s ease;
}

.back-btn:hover {
  background: var(--transparent-yellow);
  border-color: #e2d9a3;
  color: var(--sceptre-red);
}

.back-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2.5;
  fill: none;
}

.badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--sceptre-red);
  background: var(--transparent-yellow);
  padding: 6px 14px;
  border-radius: 16px;
}

.close-icon {
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--java-brown);
  cursor: pointer;
}

.expanded-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--java-brown);
  margin-bottom: 20px;
}

/* ACTION BAR */
.action-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.upload-btn {
  flex: 2;
  min-width: 220px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: 1.5px dashed var(--cerulean-blue);
  border-radius: 16px;
  background: #f4f8fc;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--potting-soil);
}

.upload-btn svg {
  width: 18px;
  height: 18px;
  stroke: var(--sceptre-red);
  stroke-width: 2;
  fill: none;
  flex-shrink: 0;
}

.btn-yellow {
  background: var(--transparent-yellow);
  color: var(--java-brown);
  border: 1px solid #e2d9a3;
  border-radius: 16px;
  padding: 12px 20px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

/* SUMMARY DISPLAY SCREEN */
.slide-screen {
  background: linear-gradient(135deg, #fbf8e6 0%, #e8f0f8 100%);
  border: 1px solid #d0e0f0;
  border-radius: 20px;
  padding: 28px;
  min-height: 240px;
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 20px;
}

.slide-indicator {
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  color: var(--sceptre-red);
  text-transform: uppercase;
}

.slide-heading {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--java-brown);
  margin: 10px 0 16px 0;
}

.summary-content {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--potting-soil);
}

.summary-slide-block {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(165, 188, 214, 0.4);
}

.summary-slide-block:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.summary-slide-title {
  font-weight: 700;
  color: var(--java-brown);
  margin-bottom: 4px;
}

.summary-slide-block ul {
  padding-left: 20px;
}

.summary-slide-block li {
  margin-bottom: 3px;
}

/* FOOTER */
.card-footer {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.status-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--potting-soil);
}