:root {
  --navy: #14213d;
  --teal: #0f766e;
  --teal-light: #ccfbf1;
  --amber: #b45309;
  --amber-light: #fef3c7;
  --ink: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f7f8fa;
  --card: #ffffff;
  --break: #f3f4f6;
  --violet: #6d28d9;
  --violet-light: #ede9fe;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.topbar {
  background: var(--navy);
  color: #fff;
  padding: 18px 28px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.topbar-eyebrow {
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 12px;
  color: #9db4d0;
}

.topbar-title h1 {
  margin: 2px 0 0;
  font-size: 22px;
  font-weight: 600;
}

.topbar-meta {
  font-size: 13px;
  color: #cbd5e1;
}

.layout {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - 74px);
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--card);
  border-right: 1px solid var(--border);
  height: calc(100vh - 74px);
  overflow-y: auto;
  position: sticky;
  top: 0;
  padding: 10px 0;
}

.sidebar-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 20px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  border-left: 3px solid transparent;
}

.sidebar-item:hover {
  background: #f0f4f8;
}

.sidebar-item.active {
  background: var(--teal-light);
  border-left-color: var(--teal);
}

.sidebar-item .week-num {
  font-weight: 700;
  font-size: 12px;
  color: var(--teal);
  display: block;
}

.sidebar-item.break .week-num { color: var(--muted); }

.sidebar-item .week-topic {
  font-size: 13.5px;
  color: var(--ink);
  display: block;
  margin-top: 2px;
  line-height: 1.3;
}

.sidebar-item.break {
  background: var(--break);
  cursor: default;
  font-style: italic;
  color: var(--muted);
}

.sidebar-item .week-dates {
  font-size: 11px;
  color: var(--muted);
}

.content {
  flex: 1;
  padding: 28px 34px 60px;
  max-width: 980px;
}

.welcome h2 { margin-top: 0; }

.week-header {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin-bottom: 22px;
}

.week-header .week-badge {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 8px;
}

.week-header h2 {
  margin: 4px 0 12px;
  font-size: 24px;
}

.week-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  font-size: 13.5px;
  margin-top: 14px;
}

.week-meta-grid .full { grid-column: 1 / -1; }

.week-meta-grid dt {
  font-weight: 700;
  color: var(--teal);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: .04em;
  margin-bottom: 2px;
}

.week-meta-grid dd {
  margin: 0 0 8px;
  color: var(--ink);
}

.assessment-flag {
  display: inline-block;
  background: var(--amber-light);
  color: var(--amber);
  border: 1px solid #fcd34d;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  margin-top: 10px;
}

.lesson-list { list-style: none; padding: 0; margin: 0; }

.lesson-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 14px;
  overflow: hidden;
}

.lesson-card summary {
  cursor: pointer;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  font-weight: 600;
}

.lesson-card summary::-webkit-details-marker { display: none; }

.lesson-card summary .lesson-tag {
  background: var(--teal);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 20px;
  margin-right: 10px;
  white-space: nowrap;
}

.lesson-card summary .lesson-title-text { flex: 1; }

.lesson-card summary .lesson-duration {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

.lesson-card summary .chevron {
  transition: transform .15s ease;
  color: var(--muted);
}

.lesson-card[open] summary .chevron { transform: rotate(90deg); }

.lesson-body {
  padding: 4px 20px 20px;
  border-top: 1px solid var(--border);
}

.lesson-section { margin-top: 14px; }

.lesson-section h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--navy);
  margin: 0 0 6px;
}

.lesson-section p { margin: 0 0 6px; font-size: 14px; line-height: 1.5; }

.lesson-section ol, .lesson-section ul {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
}

pre.code-block {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.5;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  margin: 6px 0;
}

.vocab-list {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: 10px;
  row-gap: 6px;
}

.vocab-list dt {
  font-weight: 700;
  color: var(--navy);
  background: var(--teal-light);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 13px;
  white-space: nowrap;
  height: fit-content;
}

.vocab-list dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.4;
}

.checklist { list-style: none; padding: 0; }
.checklist li {
  padding-left: 22px;
  position: relative;
  margin-bottom: 4px;
}
.checklist li::before {
  content: "\2610";
  position: absolute;
  left: 0;
  color: var(--teal);
}

.copy-btn {
  margin-top: 16px;
  background: var(--navy);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.copy-btn:hover { background: #1e3a5f; }
.copy-btn.copied { background: var(--teal); }

.week-nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
}

.week-nav-buttons button {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}

.week-nav-buttons button:hover { background: #f0f4f8; }
.week-nav-buttons button:disabled { opacity: .4; cursor: default; }

.sidebar-divider {
  padding: 14px 20px 6px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}

.rubrics-item {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.rubrics-item .week-num {
  color: var(--amber);
}

.rubric-section-title {
  font-size: 16px;
  margin: 26px 0 12px;
  color: var(--navy);
}

.rubric-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 20px;
  overflow-x: auto;
}

.rubric-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 12.5px;
}

.rubric-table th {
  background: var(--navy);
  color: #fff;
  text-align: left;
  padding: 8px 10px;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.rubric-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  vertical-align: top;
  line-height: 1.4;
}

.rubric-table tr:nth-child(even) td {
  background: #fafbfc;
}

.rubric-points, .rubric-points-cell {
  color: var(--teal);
  font-weight: 700;
  font-size: 11.5px;
}

.literacy-strategy-block {
  background: var(--violet-light);
  border: 1px solid #ddd6fe;
  border-radius: 8px;
  padding: 10px 14px;
}

.literacy-strategy-block h4 {
  color: var(--violet) !important;
}

.teacher-note {
  font-size: 13px;
  color: var(--muted);
  font-style: italic;
  border-left: 3px solid var(--border);
  padding-left: 10px;
  margin-top: 10px;
}