/* ============================================================
   RealHouse Explainer Site — Shared Stylesheet
   A clean, readable stylesheet for a 4-page static HTML
   internal-documentation site. No JavaScript required.
   ============================================================ */

/* ------------------------------------------------------------
   1. CSS Custom Properties (Color Palette)
   ------------------------------------------------------------ */
:root {
  /* Federal sources — blue tones */
  --federal: #2563eb;
  --federal-bg: #eff6ff;
  --federal-border: #93c5fd;
  --federal-text: #1e40af;

  /* Local sources — green tones */
  --local: #16a34a;
  --local-bg: #f0fdf4;
  --local-border: #86efac;
  --local-text: #166534;

  /* Derived / modeled — amber tones */
  --derived: #d97706;
  --derived-bg: #fffbeb;
  --derived-border: #fcd34d;
  --derived-text: #92400e;

  /* Dashboard — purple tones */
  --dashboard: #7c3aed;
  --dashboard-bg: #f5f3ff;
  --dashboard-border: #c4b5fd;
  --dashboard-text: #5b21b6;

  /* Neutrals */
  --text: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-dark: #d1d5db;
  --bg: #ffffff;
  --bg-subtle: #f9fafb;
  --bg-muted: #f3f4f6;

  /* Links */
  --link: #2563eb;
  --link-hover: #1d4ed8;
  --link-visited: #7c3aed;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.08);
}

/* ------------------------------------------------------------
   2. Reset & Base Typography
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 4rem;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  color: var(--text);
  font-weight: 600;
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.5rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--border);
}

h3 {
  font-size: 1.2rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-md);
}

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

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

a:visited {
  color: var(--link-visited);
}

ul,
ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-xs);
}

strong {
  font-weight: 600;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-xl) 0;
}

img {
  max-width: 100%;
  height: auto;
}

/* ------------------------------------------------------------
   3. Navigation Bar
   ------------------------------------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  height: 3.5rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--text);
}

.nav-brand:visited {
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: var(--space-sm);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition:
    background-color 0.15s ease,
    color 0.15s ease;
}

.nav-links a:visited {
  color: var(--text-secondary);
}

.nav-links a:hover {
  background-color: var(--bg-muted);
  color: var(--text);
  text-decoration: none;
}

.nav-links .nav-active a {
  background-color: var(--federal-bg);
  color: var(--federal);
  font-weight: 600;
}

.nav-links .nav-active a:visited {
  color: var(--federal);
}

/* ------------------------------------------------------------
   4. Layout Containers
   ------------------------------------------------------------ */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.section {
  margin-bottom: var(--space-2xl);
}

/* ------------------------------------------------------------
   5. Hero Section
   ------------------------------------------------------------ */
.hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  margin-bottom: var(--space-xl);
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: 2.25rem;
  margin-bottom: var(--space-sm);
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ------------------------------------------------------------
   6. Details / Summary (Progressive Disclosure)
   ------------------------------------------------------------ */
details {
  margin-bottom: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg);
  overflow: hidden;
}

summary {
  cursor: pointer;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  background-color: var(--bg-subtle);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  user-select: none;
  transition: background-color 0.15s ease;
}

summary:hover {
  background-color: var(--bg-muted);
}

/* Custom chevron indicator */
summary::before {
  content: "\25B6"; /* right-pointing triangle */
  display: inline-block;
  font-size: 0.7rem;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

details[open] > summary::before {
  transform: rotate(90deg);
}

/* Hide default marker in Safari/Chrome */
summary::-webkit-details-marker {
  display: none;
}

details[open] > summary {
  border-bottom: 1px solid var(--border);
}

details > :not(summary) {
  padding: 0 var(--space-md);
}

details > p:first-of-type,
details > div:first-of-type,
details > ul:first-of-type,
details > ol:first-of-type,
details > table:first-of-type,
details > pre:first-of-type {
  margin-top: var(--space-md);
}

details .details-content {
  padding: var(--space-md);
}

/* ------------------------------------------------------------
   7. Diagram Styles (CSS Boxes + Arrows)
   ------------------------------------------------------------ */

/* Horizontal flex row of diagram boxes */
.diagram-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin: var(--space-lg) 0;
}

/* Individual diagram box */
.diagram-box {
  background-color: var(--bg);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 120px;
  box-shadow: var(--shadow-sm);
}

.diagram-box.federal {
  border-color: var(--federal);
  background-color: var(--federal-bg);
  color: var(--federal-text);
}

.diagram-box.local {
  border-color: var(--local);
  background-color: var(--local-bg);
  color: var(--local-text);
}

.diagram-box.derived {
  border-color: var(--derived);
  background-color: var(--derived-bg);
  color: var(--derived-text);
}

.diagram-box.dashboard {
  border-color: var(--dashboard);
  background-color: var(--dashboard-bg);
  color: var(--dashboard-text);
}

/* Arrow connecting element between boxes */
.diagram-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-shrink: 0;
  position: relative;
  min-width: 2rem;
}

.diagram-arrow::after {
  content: "\2192"; /* right arrow character */
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* Vertical flow variant */
.diagram-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin: var(--space-lg) 0;
}

.diagram-flow .diagram-box {
  width: 220px;
}

.diagram-flow .diagram-arrow {
  min-width: auto;
  min-height: 1.5rem;
}

.diagram-flow .diagram-arrow::after {
  content: "\2193"; /* down arrow character */
}

/* ------------------------------------------------------------
   8. Tables
   ------------------------------------------------------------ */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background-color: var(--bg-muted);
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

tr:nth-child(even) {
  background-color: var(--bg-subtle);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background-color: var(--bg-muted);
}

/* ------------------------------------------------------------
   9. Status Badges
   ------------------------------------------------------------ */
.badge {
  display: inline-block;
  padding: 0.15em 0.6em;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
  border-radius: 999px;
  white-space: nowrap;
  vertical-align: middle;
}

.badge-done {
  background-color: var(--local-bg);
  color: var(--local-text);
  border: 1px solid var(--local-border);
}

.badge-planned {
  background-color: var(--derived-bg);
  color: var(--derived-text);
  border: 1px solid var(--derived-border);
}

.badge-researched {
  background-color: var(--federal-bg);
  color: var(--federal-text);
  border: 1px solid var(--federal-border);
}

.badge-future {
  background-color: var(--bg-muted);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ------------------------------------------------------------
   10. Source Cards
   ------------------------------------------------------------ */
.source-card {
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
  background-color: var(--bg);
}

.source-card h3 {
  margin-top: 0;
  margin-bottom: var(--space-xs);
  font-size: 1.05rem;
}

.source-card p {
  margin-bottom: var(--space-xs);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.source-card p:last-child {
  margin-bottom: 0;
}

.source-federal {
  border-left-color: var(--federal);
}

.source-local {
  border-left-color: var(--local);
}

.source-derived {
  border-left-color: var(--derived);
}

/* ------------------------------------------------------------
   11. Schema Cards
   ------------------------------------------------------------ */
.schema-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
  background-color: var(--bg);
}

.schema-card-header {
  background-color: var(--bg-muted);
  padding: var(--space-sm) var(--space-md);
  font-weight: 700;
  font-size: 0.95rem;
  font-family:
    "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Consolas", monospace;
  border-bottom: 1px solid var(--border);
}

.schema-card-body {
  padding: var(--space-sm) var(--space-md);
}

.schema-card-body ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.schema-card-body li {
  padding: var(--space-xs) 0;
  font-size: 0.85rem;
  font-family:
    "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Consolas", monospace;
  border-bottom: 1px solid var(--border);
}

.schema-card-body li:last-child {
  border-bottom: none;
}

.schema-col-type {
  color: var(--text-muted);
  font-weight: 400;
  margin-left: var(--space-sm);
}

.schema-col-pk {
  color: var(--derived);
  font-weight: 600;
  font-size: 0.75rem;
  margin-left: var(--space-xs);
}

/* ------------------------------------------------------------
   12. Formula Blocks
   ------------------------------------------------------------ */
.formula {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  text-align: center;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text);
  overflow-x: auto;
}

.formula var {
  font-style: italic;
  font-weight: 500;
}

.formula sub,
.formula sup {
  font-size: 0.75em;
}

/* ------------------------------------------------------------
   13. Code & Pre Blocks
   ------------------------------------------------------------ */
code {
  font-family:
    "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Consolas", monospace;
  font-size: 0.875em;
  background-color: var(--bg-muted);
  padding: 0.15em 0.35em;
  border-radius: var(--radius-sm);
  color: var(--text);
}

pre {
  background-color: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  font-size: 0.85rem;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

/* ------------------------------------------------------------
   14. Footer
   ------------------------------------------------------------ */
.footer {
  margin-top: var(--space-2xl);
  padding: var(--space-lg);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--text-muted);
}

.footer a:hover {
  color: var(--text);
}

/* ------------------------------------------------------------
   15. Utility Classes
   ------------------------------------------------------------ */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.text-small {
  font-size: 0.85rem;
}

.mt-0 {
  margin-top: 0;
}
.mb-0 {
  margin-bottom: 0;
}
.mt-1 {
  margin-top: var(--space-md);
}
.mb-1 {
  margin-bottom: var(--space-md);
}
.mt-2 {
  margin-top: var(--space-xl);
}
.mb-2 {
  margin-bottom: var(--space-xl);
}

/* ------------------------------------------------------------
   16. Scorecard Grid (Parity Page)
   ------------------------------------------------------------ */
.scorecard {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.scorecard-item {
  text-align: center;
  padding: var(--space-lg) var(--space-sm);
  border-radius: var(--radius-lg);
  border: 2px solid;
}

.scorecard-number {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
}

.scorecard-label {
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: var(--space-xs);
}

.scorecard-desc {
  font-size: 0.8rem;
  opacity: 0.8;
  margin-top: var(--space-xs);
}

.scorecard-yes {
  background-color: var(--local-bg);
  border-color: var(--local-border);
  color: var(--local-text);
}

.scorecard-partial {
  background-color: var(--derived-bg);
  border-color: var(--derived-border);
  color: var(--derived-text);
}

.scorecard-local {
  background-color: var(--federal-bg);
  border-color: var(--federal-border);
  color: var(--federal-text);
}

.scorecard-no {
  background-color: #fff1f2;
  border-color: #fda4af;
  color: #9f1239;
}

/* ------------------------------------------------------------
   17. Gap Source Cards & Paid Data (Parity Page)
   ------------------------------------------------------------ */
.source-gap {
  border-left-color: #f43f5e;
}

.source-paid {
  border-left-color: #7c3aed;
}

.diagram-box-gap {
  border-color: #f43f5e;
  background-color: #fff1f2;
  color: #9f1239;
}

.diagram-box-paid {
  border-color: #7c3aed;
  background-color: #f5f3ff;
  color: #5b21b6;
}

/* Acquisition cards */
.acq-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  overflow: hidden;
  background-color: var(--bg);
}

.acq-card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.acq-card-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

.acq-card-meta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  font-size: 0.85rem;
}

.acq-card-meta span {
  white-space: nowrap;
}

.acq-card-body {
  padding: var(--space-md) var(--space-lg);
}

.acq-card-body p {
  font-size: 0.9rem;
}

.parity-bar-track {
  height: 8px;
  background-color: var(--bg-muted);
  border-radius: 4px;
  margin: var(--space-sm) 0 var(--space-xs);
  overflow: hidden;
}

.parity-bar-fill {
  height: 100%;
  border-radius: 4px;
  background-color: var(--local);
}

.parity-bar-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Investment summary table */
.invest-summary {
  margin: var(--space-lg) 0;
}

.invest-summary td:nth-child(2),
.invest-summary td:nth-child(3),
.invest-summary th:nth-child(2),
.invest-summary th:nth-child(3) {
  text-align: right;
  white-space: nowrap;
}

.invest-total td {
  font-weight: 700;
  border-top: 2px solid var(--text);
}

/* ------------------------------------------------------------
   18. Responsive — Single Column Below 768px
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .nav-inner {
    flex-wrap: wrap;
    height: auto;
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
    gap: var(--space-sm);
  }

  .nav-links {
    flex-wrap: wrap;
    gap: var(--space-xs);
  }

  .container {
    padding: var(--space-lg) var(--space-md);
  }

  /* Diagram boxes stack vertically */
  .diagram-row {
    flex-direction: column;
    gap: 0;
  }

  .diagram-row .diagram-arrow::after {
    content: "\2193"; /* down arrow when stacked */
  }

  .diagram-row .diagram-arrow {
    min-width: auto;
    min-height: 1.5rem;
  }

  .diagram-box {
    width: 100%;
    max-width: 280px;
  }

  /* Tables scroll horizontally */
  .table-wrapper {
    margin-left: calc(-1 * var(--space-md));
    margin-right: calc(-1 * var(--space-md));
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  /* Source cards reduce padding */
  .source-card {
    padding: var(--space-sm) var(--space-md);
  }

  .formula {
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
  }

  .scorecard {
    grid-template-columns: repeat(2, 1fr);
  }

  .scorecard-number {
    font-size: 2rem;
  }
}