:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-muted: #6b6b6b;
  --line: #e6e6e6;
  --line-strong: #cccccc;
  --accent: #1a4d8c;
  --accent-soft: #e8eef7;
  --math: #6b21a8;
  --math-soft: #f1e8f8;
  --ela: #15803d;
  --ela-soft: #e6f4ea;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --code-bg: #f3f3f0;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Hero */
header.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f3f5fa 100%);
  border-bottom: 1px solid var(--line);
  padding: 56px 0 40px;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}
h1 {
  font-size: 38px;
  line-height: 1.15;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
h1 small {
  display: block;
  font-size: 17px;
  color: var(--ink-muted);
  font-weight: 400;
  margin-top: 6px;
  letter-spacing: 0;
}
.lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 800px;
  margin: 0 0 24px;
}
nav.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}
nav.toc a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: white;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all .15s;
}
nav.toc a:hover { background: var(--accent); color: white; border-color: var(--accent); }
nav.toc a.current { background: var(--accent); color: white; border-color: var(--accent); }

/* Layout sections */
main { padding: 48px 0 80px; }
section { margin-bottom: 56px; scroll-margin-top: 24px; }
section h2 {
  font-size: 26px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
section h2 .grade-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  vertical-align: middle;
  margin-right: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}
section .section-intro {
  color: var(--ink-soft);
  margin: 0 0 24px;
  max-width: 860px;
}
h3 { font-size: 18px; margin-top: 32px; margin-bottom: 12px; letter-spacing: -0.005em; }

/* Cards on landing */
.subject-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 18px;
  margin: 24px 0;
}
.subject-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--accent);
  text-decoration: none;
  color: var(--ink);
  display: block;
  transition: transform .15s;
}
.subject-card:hover { transform: translateY(-2px); }
.subject-card.math { border-top-color: var(--math); }
.subject-card.ela { border-top-color: var(--ela); }
.subject-card h3 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.subject-card p { margin: 0 0 12px; color: var(--ink-soft); font-size: 14px; }
.subject-card .meta {
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: 12px;
}
.subject-card .arrow {
  color: var(--accent);
  font-weight: 600;
  margin-top: 12px;
  display: inline-block;
}
.subject-card.math .arrow { color: var(--math); }
.subject-card.ela .arrow { color: var(--ela); }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 13.5px;
  margin-top: 12px;
}
thead th {
  background: #f5f6f8;
  text-align: left;
  padding: 10px 12px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  border-bottom: 1px solid var(--line);
  font-weight: 600;
  vertical-align: top;
}
tbody td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #fafbfc; }
td.strand-cell, td.domain-cell {
  font-weight: 600;
  white-space: nowrap;
  width: 120px;
}
td.strand-cell .badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-rl { background: #dbeafe; color: #1e3a8a; }
.badge-ri { background: #cffafe; color: #155e75; }
.badge-rf { background: #fef3c7; color: #92400e; }
.badge-w  { background: #fce7f3; color: #831843; }
.badge-sl { background: #ede9fe; color: #5b21b6; }
.badge-l  { background: #d1fae5; color: #065f46; }
.badge-ma { background: var(--math-soft); color: var(--math); }
.skill-list { margin: 0; padding-left: 18px; font-size: 13px; }
.skill-list li { margin-bottom: 3px; }
.code-list {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
}
.rit-band {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}
.note-text {
  font-size: 12.5px;
  color: var(--ink-muted);
  font-style: italic;
}
.gap-marker {
  display: inline-block;
  padding: 1px 7px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 3px;
  background: var(--warn-soft);
  color: var(--warn);
  text-transform: uppercase;
}

/* Filter bar */
.filter-bar {
  margin: 16px 0 12px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.filter-bar input[type=text] {
  flex: 1;
  min-width: 240px;
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
}
.filter-bar input[type=text]:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}
.filter-bar .hint {
  font-size: 12px;
  color: var(--ink-muted);
}

/* Grade nav */
.grade-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 16px 0 24px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow);
}
.grade-nav .label {
  font-size: 12px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-right: 4px;
  align-self: center;
}
.grade-nav a {
  display: inline-block;
  padding: 5px 11px;
  border-radius: 4px;
  background: #f1f3f6;
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
}
.grade-nav a:hover { background: var(--accent); color: white; }

/* Callouts */
details.callout {
  background: #fff8e6;
  border: 1px solid #f0d97a;
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 24px 0;
  font-size: 14px;
}
details.callout summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--warn);
}
details.callout p, details.callout ul { margin: 8px 0 0; color: var(--ink-soft); }
details.callout ul { padding-left: 22px; }
details.callout li { margin-bottom: 4px; }

.banner-warn {
  background: #fff8e6;
  border: 1px solid #f0d97a;
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 0 0 24px;
  font-size: 14px;
  color: var(--ink-soft);
}
.banner-warn strong { color: var(--warn); }

/* Throughlines */
.throughlines {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 18px;
  margin-top: 16px;
}
.through-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.through-card h3 {
  margin: 0 0 14px;
  font-size: 17px;
  letter-spacing: -0.005em;
}
.through-card .stage {
  font-size: 13.5px;
  margin: 6px 0;
  padding-left: 16px;
  position: relative;
}
.through-card .stage::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}
.through-card .stage strong { color: var(--accent); font-weight: 600; }
.through-card .pattern {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13px;
  color: var(--ink-muted);
  font-style: italic;
}

/* Footer */
footer {
  border-top: 1px solid var(--line);
  background: white;
  padding: 32px 0 48px;
  color: var(--ink-muted);
  font-size: 13px;
}
footer h3 { color: var(--ink); margin-top: 0; font-size: 15px; }
footer ul { padding-left: 18px; line-height: 1.8; }
footer a { color: var(--accent); }
code, .code {
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.92em;
}
.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 16px 0 8px;
  font-size: 13px;
  color: var(--ink-soft);
}
.legend .badge {
  font-family: inherit;
}

/* ============================================ */
/* Sheet-tab metaphor + drill-down modal         */
/* ============================================ */

.sheet-tabs {
  display: flex;
  gap: 0;
  align-items: flex-end;
  margin: 24px 0 -1px;
  font-size: 13px;
  border-bottom: 1px solid var(--line);
  padding-left: 4px;
}
.sheet-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px 9px;
  background: #ecedef;
  color: var(--ink-muted);
  border: 1px solid var(--line);
  border-bottom: none;
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
  margin-right: 2px;
  text-decoration: none;
  font-weight: 500;
  cursor: default;
  position: relative;
  bottom: -1px;
  white-space: nowrap;
}
.sheet-tab.active {
  background: var(--surface);
  color: var(--ink);
  border-bottom-color: var(--surface);
  font-weight: 600;
  z-index: 2;
}
.sheet-tab.inactive {
  font-style: italic;
  color: var(--ink-muted);
  background: transparent;
  border-color: transparent;
  font-weight: 400;
}
.sheet-tab a, a.sheet-tab {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.sheet-tab a:hover, a.sheet-tab:hover {
  background: #f5f6f8;
  color: var(--accent);
}
.sheet-tab .icon {
  font-size: 14px;
  line-height: 1;
}

/* Make Skills cells in matrix tables look clickable */
table.filterable tbody td.drillable {
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}
table.filterable tbody td.drillable:hover {
  background: var(--accent-soft);
}
table.filterable tbody td.drillable::after {
  content: "↗";
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 11px;
  color: var(--ink-muted);
  opacity: 0.5;
  font-weight: 600;
}
table.filterable tbody td.drillable:hover::after {
  color: var(--accent);
  opacity: 1;
}

/* Modal backdrop & panel */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 25, 40, 0.55);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px;
  overflow-y: auto;
}
.modal-backdrop[hidden] { display: none !important; }
.modal-panel {
  background: var(--surface);
  width: 100%;
  max-width: 1080px;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  margin-top: 32px;
  overflow: hidden;
  animation: modalIn .18s ease-out;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal-tabs {
  background: #e9ecef;
  padding: 10px 14px 0;
  display: flex;
  gap: 0;
  align-items: flex-end;
  border-bottom: 1px solid var(--line);
}
.modal-tabs .sheet-tab {
  margin-bottom: 0;
}
.modal-close {
  margin-left: auto;
  margin-bottom: 6px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 18px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  color: var(--ink-muted);
}
.modal-close:hover {
  background: white;
  color: var(--ink);
  border-color: var(--line);
}
.modal-header {
  padding: 18px 28px 6px;
  border-bottom: 1px solid var(--line);
}
.modal-header .breadcrumb {
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.modal-header h2 {
  margin: 0 0 6px;
  font-size: 20px;
  letter-spacing: -0.005em;
}
.modal-header .subhead {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 4px 0 12px;
}
.modal-header .meta-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--ink-muted);
  padding: 8px 0 12px;
}
.modal-header .meta-row .meta-item strong {
  color: var(--ink);
  font-weight: 600;
}

.modal-body {
  padding: 20px 28px 32px;
  max-height: calc(100vh - 220px);
  overflow-y: auto;
}
.modal-body h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  margin: 24px 0 10px;
  font-weight: 600;
}
.modal-body h3:first-child { margin-top: 4px; }

/* Standard-by-standard overlap rows */
.overlap-row {
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--surface);
}
.overlap-row .overlap-head {
  background: #f5f6f8;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 12px;
  align-items: center;
}
.overlap-row .std-code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}
.overlap-row .overlap-quality {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 3px;
  white-space: nowrap;
}
.overlap-row .overlap-quality.full { background: #d1fae5; color: #065f46; }
.overlap-row .overlap-quality.partial { background: #fef3c7; color: #92400e; }
.overlap-row .overlap-quality.gap { background: #fee2e2; color: #991b1b; }

.overlap-row .std-text {
  padding: 12px 14px;
  font-size: 13.5px;
  color: var(--ink);
  line-height: 1.55;
  font-style: italic;
  border-bottom: 1px dashed var(--line);
  background: #fcfcfd;
}
.overlap-row .nwea-block {
  padding: 12px 14px;
}
.overlap-row .nwea-label {
  font-size: 11px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: 6px;
}
.overlap-row .nwea-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.overlap-row .nwea-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 4px 0;
  font-size: 13px;
  color: var(--ink-soft);
}
.overlap-row .nwea-list .rit-badge {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 7px;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 64px;
  text-align: center;
}
.overlap-row .overlap-note {
  padding: 10px 14px;
  background: #fafbfc;
  font-size: 12.5px;
  color: var(--ink-muted);
  border-top: 1px solid var(--line);
  font-style: italic;
}

.overlap-summary {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 13.5px;
  color: var(--ink);
  margin-bottom: 16px;
}
.overlap-gaps {
  background: #fff8e6;
  border-left: 3px solid var(--warn);
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 13px;
  margin: 12px 0;
}
.overlap-gaps strong { color: var(--warn); }
.overlap-gaps ul { margin: 6px 0 0; padding-left: 22px; }

.no-data {
  padding: 20px;
  text-align: center;
  color: var(--ink-muted);
  font-style: italic;
  font-size: 13px;
  background: #fafbfc;
  border-radius: 6px;
}

@media (max-width: 760px) {
  .modal-panel { margin-top: 12px; }
  .modal-body { padding: 16px 18px 24px; }
  .modal-header { padding: 14px 18px 4px; }
  .overlap-row .overlap-head { flex-wrap: wrap; }
  .overlap-row .nwea-list li { flex-direction: column; gap: 2px; }
  .sheet-tab { padding: 6px 10px; font-size: 12px; }
}

@media (max-width: 760px) {
  h1 { font-size: 28px; }
  .lede { font-size: 16px; }
  table { font-size: 12.5px; }
  thead { display: none; }
  tbody td { display: block; padding: 8px 14px; border-bottom: none; }
  tbody td.strand-cell, tbody td.domain-cell { padding-top: 14px; background: #f5f6f8; width: auto; white-space: normal; }
  tbody tr { border-bottom: 1px solid var(--line); display: block; }
  tbody td::before {
    content: attr(data-label);
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ink-muted);
    font-weight: 600;
    margin-bottom: 4px;
  }
  tbody td.strand-cell::before, tbody td.domain-cell::before { display: none; }
  .grade-nav { position: static; }
}