/* ---------- Reset & base ---------- */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: #0f172a; /* slate-900 */
}

.page {
  min-height: 100vh;
  background: linear-gradient(to bottom, #f8fafc 0%, #ffffff 45%, #eff6ff 100%);
}

.container {
  max-width: 64rem;
  margin: 0 auto;
  padding: 3rem 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 3rem 1.5rem;
  }
}

.icon-sm {
  display: inline-flex;
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
}
.icon-sm svg {
  width: 100%;
  height: 100%;
}

/* ---------- Header ---------- */
.header {
  position: relative;
  overflow: hidden;
  border: 1px solid #dbeafe;
  background: #ffffff;
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

@media (min-width: 640px) {
  .header {
    padding: 2.5rem;
  }
}

.header-glow {
  position: absolute;
  width: 14rem;
  height: 14rem;
  border-radius: 9999px;
  filter: blur(64px);
}

.header-glow--right {
  right: -4rem;
  top: -4rem;
  background: rgba(191, 219, 254, 0.6);
}

.header-glow--left {
  left: -2.5rem;
  bottom: -5rem;
  background: rgba(224, 242, 254, 0.5);
}

.header-content {
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 1rem;
  background: #2563eb;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.brand-icon svg {
  width: 1.75rem;
  height: 1.75rem;
}

.brand-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: #2563eb;
}

.title {
  margin: 1rem 0 0;
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #0f172a;
}

@media (min-width: 640px) {
  .title {
    font-size: 2.25rem;
  }
}

.subtitle {
  margin: 0.5rem 0 0;
  max-width: 42rem;
  font-size: 1rem;
  line-height: 1.6;
  color: #475569;
}

/* ---------- Topical Outline (interactive flow chart) ---------- */
.outline {
  margin-top: 1.5rem;
}

.outline-heading {
  margin: 0 0 1.75rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #334155;
}

.outline-flow {
  position: relative;
  margin-top: 0.75rem;
}

.outline-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 1.5rem;
  height: 1px;
  background: linear-gradient(to right, #bfdbfe, #93c5fd, #bfdbfe);
  display: none;
}

@media (min-width: 640px) {
  .outline-line {
    display: block;
  }
}

.outline-nodes {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .outline-nodes {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
  }
}

.outline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  border: none;
  background: transparent;
  border-radius: 0.75rem;
  padding: 0.25rem 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.outline-node-modules {
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: #94a3b8;
}

.outline-node-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 9999px;
  border: 2px solid #e2e8f0;
  background: #fff;
  color: #2563eb;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.outline-node-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.outline-node.is-active .outline-node-icon {
  border-color: #60a5fa;
  background: #dbeafe;
  color: #1d4ed8;
  box-shadow: 0 0 0 4px #dbeafe;
}

.outline-node:hover .outline-node-icon {
  border-color: #60a5fa;
}

.outline-node-label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.3;
  color: #475569;
  transition: color 0.2s ease;
}

.outline-node.is-active .outline-node-label {
  color: #1d4ed8;
}

.outline-node:hover .outline-node-label {
  color: #2563eb;
}

.outline-detail {
  margin-top: 1rem;
  border: 1px solid #dbeafe;
  background: rgba(248, 250, 252, 0.7);
  border-radius: 0.75rem;
  padding: 1rem;
}

.outline-detail-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #1d4ed8;
}

.outline-detail-head .icon-sm {
  width: 1rem;
  height: 1rem;
}

.outline-detail-title {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.3;
}

.outline-detail-list {
  list-style: none;
  margin: 0.625rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.outline-detail-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: #475569;
}

.outline-detail-dot {
  margin-top: 0.4rem;
  width: 0.25rem;
  height: 0.25rem;
  flex-shrink: 0;
  border-radius: 9999px;
  background: #60a5fa;
}

.summary-line {
  margin-top: 2rem;
  font-size: 0.75rem;
  color: #64748b;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  position: sticky;
  top: 0.75rem;
  z-index: 10;
  margin-top: 2rem;
  border: 1px solid #e2e8f0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.filter-label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-right: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748b;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  border-radius: 9999px;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  background: #fff;
}

.filter-chip--all {
  border-color: #e2e8f0;
  color: #334155;
}

.filter-chip--all:hover {
  border-color: #94a3b8;
}

.filter-chip--all.is-active {
  border-color: #1e293b;
  background: #1e293b;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.filter-chip[data-type='reading'] {
  background: #eff6ff;
  color: #1d4ed8;
  box-shadow: inset 0 0 0 1px #bfdbfe;
}
.filter-chip[data-type='discussion'] {
  background: #faf5ff;
  color: #7e22ce;
  box-shadow: inset 0 0 0 1px #e9d5ff;
}
.filter-chip[data-type='task'] {
  background: #fffbeb;
  color: #b45309;
  box-shadow: inset 0 0 0 1px #fde68a;
}
.filter-chip[data-type='assignment'] {
  background: #fff7ed;
  color: #c2410c;
  box-shadow: inset 0 0 0 1px #fed7aa;
}

.filter-chip[data-type='reading'].is-active {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.filter-chip[data-type='discussion'].is-active {
  background: #9333ea;
  border-color: #9333ea;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.filter-chip[data-type='task'].is-active {
  background: #f59e0b;
  border-color: #f59e0b;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.filter-chip[data-type='assignment'].is-active {
  background: #ea580c;
  border-color: #ea580c;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.filter-hint {
  margin: 0.625rem 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: #64748b;
}

.view-toggle-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid #f1f5f9;
}

.view-toggle-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748b;
}

.view-toggle {
  display: inline-flex;
  border: 1px solid #e2e8f0;
  background: #f8fafc;
  border-radius: 0.5rem;
  padding: 0.125rem;
}

.view-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  border: none;
  background: transparent;
  border-radius: 0.375rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #475569;
  cursor: pointer;
  transition: all 0.2s ease;
}

.view-toggle-btn.is-active {
  background: #fff;
  color: #1d4ed8;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* ---------- Module timeline ---------- */
.timeline {
  position: relative;
  margin-top: 1.5rem;
}

.timeline-line {
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, #93c5fd, #bfdbfe, transparent);
}

@media (min-width: 640px) {
  .timeline-line {
    left: 26px;
  }
}

.timeline-items {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeline-row {
  position: relative;
  padding-left: 3rem;
}

@media (min-width: 640px) {
  .timeline-row {
    padding-left: 4rem;
  }
}

.timeline-badge {
  position: absolute;
  left: 0;
  top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  border: 2px solid #fff;
  background: #2563eb;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 0 0 4px #dbeafe;
}

.module-card {
  position: relative;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: box-shadow 0.3s ease, opacity 0.3s ease;
}

.module-card.is-highlighted {
  border-color: #93c5fd;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

.module-card.is-dimmed {
  opacity: 0.5;
}

.module-card-stripe {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 6px;
  background: linear-gradient(to bottom, #3b82f6, #38bdf8);
}

.module-card-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1.25rem 1.75rem;
}

.module-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  background: #eff6ff;
  color: #2563eb;
  box-shadow: inset 0 0 0 1px #dbeafe;
}

.module-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.module-meta {
  min-width: 0;
  flex: 1;
}

.module-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.module-badge {
  border-radius: 9999px;
  background: #2563eb;
  padding: 0.125rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
}

.module-weeks {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748b;
}

.module-title {
  margin: 0.375rem 0 0;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  color: #0f172a;
}

.module-items {
  list-style: none;
  margin: 0;
  padding: 0 1.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.module-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  border-radius: 0.75rem;
  background: rgba(248, 250, 252, 0.7);
  padding: 0.75rem;
}

.module-item[data-type='reading'] {
  box-shadow: inset 0 0 0 1px #bfdbfe;
}
.module-item[data-type='discussion'] {
  box-shadow: inset 0 0 0 1px #e9d5ff;
}
.module-item[data-type='task'] {
  box-shadow: inset 0 0 0 1px #fde68a;
}
.module-item[data-type='assignment'] {
  box-shadow: inset 0 0 0 1px #fed7aa;
}

.module-item-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 0.5rem;
}

.module-item-icon svg {
  width: 1rem;
  height: 1rem;
}

.module-item[data-type='reading'] .module-item-icon {
  background: #eff6ff;
  color: #1d4ed8;
}
.module-item[data-type='discussion'] .module-item-icon {
  background: #faf5ff;
  color: #7e22ce;
}
.module-item[data-type='task'] .module-item-icon {
  background: #fffbeb;
  color: #b45309;
}
.module-item[data-type='assignment'] .module-item-icon {
  background: #fff7ed;
  color: #c2410c;
}

.module-item-body {
  flex: 1;
}

.module-item-label {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  color: #1e293b;
}

.module-item-description {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: #64748b;
}

.module-item-type {
  display: inline-block;
  margin-top: 0.25rem;
  border-radius: 0.25rem;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.module-item[data-type='reading'] .module-item-type {
  color: #1d4ed8;
}
.module-item[data-type='discussion'] .module-item-type {
  color: #7e22ce;
}
.module-item[data-type='task'] .module-item-type {
  color: #b45309;
}
.module-item[data-type='assignment'] .module-item-type {
  color: #c2410c;
}

.module-empty {
  margin: 0;
  padding: 0 1.75rem 1.25rem;
  font-size: 0.875rem;
  font-style: italic;
  color: #94a3b8;
}

/* ---------- Tasks & Assignments table ---------- */
.tasks-wrap {
  margin-top: 1.5rem;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.tasks-grid {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem 0.75rem;
  padding: 1rem;
}

@media (min-width: 640px) {
  .tasks-grid {
    grid-template-columns: auto 1fr auto auto;
    gap: 0.75rem 1rem;
    padding: 1.25rem;
  }
}

.task-num {
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  background: #eff6ff;
  font-size: 0.75rem;
  font-weight: 700;
  color: #1d4ed8;
  box-shadow: inset 0 0 0 1px #dbeafe;
}

.task-label {
  align-self: center;
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  color: #1e293b;
}

.task-chip {
  display: inline-flex;
  align-self: center;
  align-items: center;
  gap: 0.375rem;
  height: 1.75rem;
  border-radius: 9999px;
  padding: 0 0.625rem;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.task-chip[data-type='task'] {
  background: #fffbeb;
  color: #b45309;
}
.task-chip[data-type='assignment'] {
  background: #fff7ed;
  color: #c2410c;
}

.task-weeks {
  display: none;
  align-self: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: #64748b;
}

@media (min-width: 640px) {
  .task-weeks {
    display: block;
  }
}

/* ---------- Footer ---------- */
.footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.75rem;
  color: #94a3b8;
}