/* =============================================
   SPATIAL DATA VALIDATION — MAIN STYLESHEET
   Color palette: lavender / dusky indigo / soft mauve / smoky plum / blush beige / creamy white
   ============================================= */

/* ---------- CSS Custom Properties ---------- */
:root {
  --c-lavender:      #c9b8e8;
  --c-lavender-lt:   #e8dff5;
  --c-indigo:        #4b3f8d;
  --c-indigo-dk:     #342d63;
  --c-mauve:         #9b7ec8;
  --c-mauve-lt:      #d4c4ee;
  --c-plum:          #6b4f8c;
  --c-plum-lt:       #b89ece;
  --c-beige:         #f0e8dc;
  --c-cream:         #faf7f4;
  --c-white:         #ffffff;
  --c-text:          #2a2340;
  --c-text-muted:    #5a5078;
  --c-border:        #ddd3ee;
  --c-surface:       #f5f0fa;
  --c-surface-alt:   #ede6f7;
  --c-code-bg:       #f0ebf8;
  --c-inline-code:   #ede5f7;
  --c-link:          #4b3f8d;
  --c-link-hover:    #6b4f8c;
  --c-accent:        #7c5cbf;

  --header-height:   64px;
  --radius:          8px;
  --radius-lg:       14px;
  --shadow-sm:       0 2px 8px rgba(75,63,141,0.10);
  --shadow-md:       0 4px 20px rgba(75,63,141,0.14);
  --shadow-lg:       0 8px 36px rgba(75,63,141,0.18);
  --transition:      0.22s ease;

  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--c-cream);
  color: var(--c-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Scroll offset for sticky header ---------- */
:target { scroll-margin-top: calc(var(--header-height) + 20px); }
h1, h2, h3, h4, h5, h6 { scroll-margin-top: calc(var(--header-height) + 20px); }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  line-height: 1.25;
  font-weight: 700;
  margin-top: 1.8em;
  margin-bottom: 0.5em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); color: var(--c-indigo); }
h2 { font-size: clamp(1.35rem, 2.8vw, 1.9rem); color: var(--c-plum); border-bottom: 2px solid var(--c-border); padding-bottom: 0.3em; }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.4rem); color: var(--c-indigo); }
h4 { font-size: 1.08rem; color: var(--c-plum); }

p { margin-bottom: 1.15em; max-width: 100%; }
strong { color: var(--c-indigo-dk); font-weight: 600; }
em { color: var(--c-plum); }

/* ---------- Links ---------- */
a {
  color: var(--c-link);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color var(--transition), text-decoration-color var(--transition);
}
a:hover, a:focus {
  color: var(--c-link-hover);
  text-decoration-color: var(--c-mauve);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 clamp(1rem, 4vw, 3rem);
}

main { flex: 1; padding-top: 1.75rem; padding-bottom: 3rem; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex; align-items: center; flex-wrap: wrap; gap: 0.3rem;
  font-size: 0.82rem; color: var(--c-text-muted);
  margin-bottom: 1.25rem;
  margin-top: 0;
  padding-top: 0;
}

.page-content {
  width: 100%;
}

/* ---------- Sticky Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(250, 247, 244, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1.5px solid var(--c-border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 clamp(1rem, 4vw, 3rem);
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--c-indigo);
  letter-spacing: -0.01em;
  transition: opacity var(--transition);
}
.site-logo:hover { opacity: 0.82; color: var(--c-indigo); text-decoration-color: transparent; }
.site-logo img, .site-logo svg { width: 38px; height: 38px; flex-shrink: 0; }
.site-logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.site-logo-text span:first-child { color: var(--c-indigo); font-size: 0.95rem; font-weight: 800; }
.site-logo-text span:last-child { color: var(--c-mauve); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.03em; text-transform: uppercase; }

/* Site Nav */
.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.site-nav a {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.42rem 0.85rem;
  border-radius: var(--radius);
  font-size: 0.88rem; font-weight: 500;
  color: var(--c-text-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a[aria-current="page"] {
  background: var(--c-surface-alt);
  color: var(--c-indigo);
  text-decoration-color: transparent;
}
.site-nav a svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  padding: 0.4rem; border-radius: var(--radius);
  color: var(--c-indigo);
  transition: background var(--transition);
}
.nav-toggle:hover { background: var(--c-surface-alt); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-indigo-dk);
  color: var(--c-lavender-lt);
  padding: 2.5rem 0;
  margin-top: auto;
}
.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 clamp(1rem, 4vw, 3rem);
}
.footer-section h3 {
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--c-lavender);
  margin-top: 0; margin-bottom: 0.75rem; border-bottom: none;
}
.footer-section a {
  display: block; padding: 0.18rem 0;
  font-size: 0.88rem; color: var(--c-mauve-lt); text-decoration: none;
  transition: color var(--transition);
}
.footer-section a:hover { color: var(--c-white); }
.footer-bottom {
  max-width: 1400px;
  margin-inline: auto;
  padding: 1rem clamp(1rem, 4vw, 3rem) 0;
  border-top: 1px solid rgba(201,184,232,0.2);
  font-size: 0.8rem; color: var(--c-plum-lt); text-align: center;
}

/* ---------- Breadcrumb links ---------- */
.breadcrumbs a { color: var(--c-mauve); text-decoration: none; transition: color var(--transition); }
.breadcrumbs a:hover { color: var(--c-indigo); }
.breadcrumbs .sep { color: var(--c-border); user-select: none; }
.breadcrumbs .current { color: var(--c-text-muted); font-weight: 500; }

/* ---------- Hero Section ---------- */
.hero {
  background: linear-gradient(135deg, var(--c-surface) 0%, var(--c-lavender-lt) 60%, var(--c-mauve-lt) 100%);
  border-radius: var(--radius-lg);
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.5rem, 5vw, 4rem);
  margin-bottom: 3rem;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 70% 40%, rgba(156,126,200,0.18) 0%, transparent 65%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 100%; }
.hero h1 { margin-top: 0; font-size: clamp(2rem, 5vw, 3.2rem); }
.hero p { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--c-text-muted); max-width: 100%; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }

/* CTA Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 600;
  text-decoration: none; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  border: none;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration-color: transparent; }
.btn-primary { background: var(--c-indigo); color: var(--c-white); }
.btn-primary:hover { background: var(--c-plum); color: var(--c-white); }
.btn-secondary { background: var(--c-surface-alt); color: var(--c-indigo); border: 1.5px solid var(--c-border); }
.btn-secondary:hover { background: var(--c-lavender-lt); color: var(--c-indigo); }
.btn svg { width: 20px; height: 20px; flex-shrink: 0; }

/* ---------- Section Cards (home page) ---------- */
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.section-card {
  background: var(--c-white);
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  color: inherit;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-decoration: none;
}
/* When the whole card is a link */
a.section-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-lavender);
  text-decoration-color: transparent;
}
/* When the card is a div (contains nested links) */
div.section-card {
  cursor: default;
}
div.section-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--c-lavender);
}
/* Reset h2 inside cards — no border, no big top margin */
.section-card h2 {
  font-size: 1.15rem;
  color: var(--c-indigo);
  margin: 0;
  border-bottom: none;
  padding-bottom: 0;
}
.section-card .card-icon { font-size: 2rem; line-height: 1; }
.section-card p { font-size: 0.9rem; color: var(--c-text-muted); margin: 0; }
.card-title-link {
  text-decoration: none;
  color: var(--c-indigo);
  font-weight: 700;
  font-size: 1.15rem;
  transition: color var(--transition);
}
.card-title-link:hover { color: var(--c-plum); }
.card-links {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--c-border);
}
.card-links a {
  font-size: 0.85rem;
  color: var(--c-mauve);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  text-decoration: none;
  padding: 0.15rem 0;
}
.card-links a:hover { color: var(--c-indigo); }
.card-links a::before { content: '›'; font-weight: 700; }

/* ---------- Article Layout ---------- */
.article-header { margin-bottom: 2rem; }
.article-header h1 { margin-top: 0; }

/* ---------- Inline Code ---------- */
:not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-inline-code);
  color: var(--c-plum);
  padding: 0.12em 0.42em;
  border-radius: 4px;
  border: none;
}

/* ---------- Code Blocks ---------- */
pre {
  position: relative;
  background: var(--c-code-bg) !important;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}
pre code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  background: none !important;
  color: var(--c-text) !important;
  padding: 0 !important;
  border-radius: 0 !important;
}
/* Prism theme overrides — palette matched */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #9b7ec8; }
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol { color: #4b3f8d; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin { color: #6b4f8c; }
.token.operator, .token.entity, .token.url, .language-css .token.string { color: #7c5cbf; }
.token.atrule, .token.attr-value, .token.keyword { color: #4b3f8d; font-weight: 600; }
.token.function { color: #8b5e9e; }
.token.regex, .token.important, .token.variable { color: #9b4faf; }
.token.important, .token.bold { font-weight: bold; }
.token.italic { font-style: italic; }

/* Copy button */
.code-block-wrapper { position: relative; }
.copy-btn {
  position: absolute; top: 0.6rem; right: 0.6rem;
  background: var(--c-surface-alt); color: var(--c-indigo);
  border: 1px solid var(--c-border); border-radius: 5px;
  padding: 0.28rem 0.6rem; font-size: 0.75rem; font-weight: 600;
  cursor: pointer; opacity: 0; transition: opacity var(--transition), background var(--transition);
  display: flex; align-items: center; gap: 0.3rem;
}
.code-block-wrapper:hover .copy-btn, .copy-btn:focus { opacity: 1; }
.copy-btn:hover { background: var(--c-lavender-lt); }
.copy-btn.copied { background: var(--c-lavender-lt); color: var(--c-plum); }

/* ---------- Mermaid Diagrams ---------- */
.mermaid {
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  text-align: center;
}

/* ---------- Tables ---------- */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1.5px solid var(--c-border);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--c-white);
}
thead { background: var(--c-indigo); color: var(--c-white); }
thead th {
  padding: 0.75rem 1rem; text-align: left;
  font-weight: 600; font-size: 0.85rem; letter-spacing: 0.03em;
  white-space: nowrap;
}
tbody tr { border-bottom: 1px solid var(--c-border); transition: background var(--transition); }
tbody tr:hover { background: var(--c-surface); }
tbody tr:last-child { border-bottom: none; }
tbody tr:nth-child(even) { background: var(--c-surface); }
tbody tr:nth-child(even):hover { background: var(--c-lavender-lt); }
td { padding: 0.65rem 1rem; vertical-align: top; }

/* ---------- Task Lists / Checkboxes ---------- */
ul.task-list, ol.task-list {
  list-style: none;
  padding-left: 0;
}
.task-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.3rem 0;
  list-style: none;
}
.task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px; height: 18px;
  min-width: 18px;
  border: 2px solid var(--c-mauve);
  border-radius: 4px;
  background: var(--c-white);
  cursor: pointer;
  margin-top: 0.2em;
  transition: background var(--transition), border-color var(--transition);
  position: relative;
}
.task-list-item input[type="checkbox"]:checked {
  background: var(--c-indigo);
  border-color: var(--c-indigo);
}
.task-list-item input[type="checkbox"]:checked::after {
  content: '';
  position: absolute; top: 1px; left: 4px;
  width: 6px; height: 10px;
  border: 2px solid white; border-top: none; border-left: none;
  transform: rotate(45deg);
}
.task-list-item.is-checked > label,
.task-list-item.is-checked > span {
  text-decoration: line-through;
  color: var(--c-text-muted);
}

/* ---------- Accordions (FAQ) ---------- */
details.faq-item {
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  background: var(--c-white);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
details.faq-item:hover { box-shadow: var(--shadow-sm); }
details.faq-item[open] { box-shadow: var(--shadow-sm); }
details.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600; font-size: 0.97rem;
  color: var(--c-indigo);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  transition: background var(--transition);
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: '+';
  font-size: 1.4rem; font-weight: 300; line-height: 1;
  color: var(--c-mauve); flex-shrink: 0; transition: transform var(--transition);
}
details.faq-item[open] summary::after { transform: rotate(45deg); }
details.faq-item summary:hover { background: var(--c-surface); }
.faq-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--c-border);
  font-size: 0.95rem; color: var(--c-text-muted);
}

/* ---------- Section dividers ---------- */
.faq-section h2, .faq-section h3 { margin-bottom: 1rem; }

/* ---------- Ordered / Unordered Lists ---------- */
ul, ol { padding-left: 1.5rem; margin-bottom: 1.15em; }
ul li, ol li { margin-bottom: 0.35em; }
ul:not(.task-list) li::marker { color: var(--c-mauve); }

/* ---------- Blockquote ---------- */
blockquote {
  border-left: 4px solid var(--c-lavender);
  background: var(--c-surface);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--c-text-muted);
  font-style: italic;
}

/* ---------- Horizontal Rule ---------- */
hr { border: none; border-top: 1.5px solid var(--c-border); margin: 2.5rem 0; }

/* ---------- Home page intro columns ---------- */
.intro-text { margin-bottom: 2.5rem; }
.intro-text p { font-size: 1.05rem; color: var(--c-text-muted); }
.featured-section { margin-bottom: 3rem; }
.featured-section h2 { font-size: 1.3rem; margin-bottom: 1.25rem; }

/* ---------- Related links ---------- */
.related-links {
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-top: 3rem;
}
.related-links h3 { font-size: 0.85rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--c-mauve); margin: 0 0 0.75rem; }
.related-links ul { list-style: none; padding: 0; margin: 0; }
.related-links li { border-bottom: 1px solid var(--c-border); }
.related-links li:last-child { border-bottom: none; }
.related-links a { display: block; padding: 0.5rem 0; font-size: 0.92rem; color: var(--c-indigo); text-decoration: none; transition: color var(--transition), padding-left var(--transition); }
.related-links a:hover { color: var(--c-link-hover); padding-left: 0.4rem; }

/* ---------- Offline page ---------- */
.offline-container { text-align: center; padding: 4rem 2rem; }
.offline-container h1 { margin-top: 0; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute; top: var(--header-height); left: 0; right: 0;
    background: rgba(250,247,244,0.97);
    backdrop-filter: blur(14px);
    flex-direction: column; align-items: stretch;
    padding: 0.75rem 1rem;
    border-bottom: 1.5px solid var(--c-border);
    box-shadow: var(--shadow-md);
    gap: 0.15rem;
  }
  .site-nav.is-open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { padding: 2rem 1.25rem; }
  pre { padding: 1rem; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .copy-btn, .nav-toggle { display: none; }
  main { padding-top: 0; }
  a { color: var(--c-text); }
}