:root {
  --bg: #090d16;
  --bg-gradient: linear-gradient(135deg, #090d16 0%, #0d1527 100%);
  --paper: rgba(17, 24, 39, 0.7);
  --paper-border: rgba(255, 255, 255, 0.08);
  --ink: #f3f4f6;
  --muted: #9ca3af;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #0d9488;
  --accent-ink: #14b8a6;
  --accent-glow: rgba(20, 184, 166, 0.15);
  --soft: rgba(20, 184, 166, 0.05);
  --warn: #d97706;
  --warn-bg: rgba(217, 119, 6, 0.1);
  --card-bg: rgba(31, 41, 55, 0.4);
  --glass-blur: blur(12px);
  --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --success: #10b981;
  --danger: #ef4444;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  --paper: rgba(255, 255, 255, 0.8);
  --paper-border: rgba(15, 23, 42, 0.08);
  --ink: #0f172a;
  --muted: #64748b;
  --line: rgba(15, 23, 42, 0.08);
  --accent: #0d9488;
  --accent-glow: rgba(13, 148, 136, 0.1);
  --accent-ink: #0f766e;
  --soft: rgba(13, 148, 136, 0.04);
  --warn: #b45309;
  --warn-bg: rgba(180, 83, 9, 0.06);
  --card-bg: rgba(241, 245, 249, 0.7);
  --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

/* Header & Navigation */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s, border 0.3s;
}
.topbar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}
.brand {
  font-family: 'Outfit', sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-ink) 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 6px;
  transition: all 0.2s;
}
.nav a:hover, .nav a.active {
  color: var(--ink);
  background: var(--card-bg);
}

/* Theme Toggle Button */
.theme-btn {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink);
  transition: all 0.2s;
}
.theme-btn:hover {
  background: var(--line);
  transform: scale(1.05);
}
.theme-btn .sun-icon { display: none; }
.theme-btn .moon-icon { display: block; }
[data-theme="dark"] .theme-btn .sun-icon { display: block; }
[data-theme="dark"] .theme-btn .moon-icon { display: none; }

/* Main layouts */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
}
.article {
  min-width: 0;
  background: var(--paper);
  border: 1px solid var(--paper-border);
  box-shadow: var(--shadow);
  border-radius: 16px;
  padding: 40px;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}
.article-header {
  margin-bottom: 34px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  color: var(--accent-ink);
  font-family: 'Outfit', sans-serif;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 8px;
}

h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  line-height: 1.3;
  color: var(--ink);
  font-weight: 700;
}
h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 12px;
}
h2 {
  font-size: 24px;
  margin: 40px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
h3 { font-size: 18px; margin: 28px 0 12px; }
h4 { font-size: 15px; margin: 24px 0 8px; }

.description {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}
.meta {
  color: var(--muted);
  margin-top: 16px;
  font-size: 13px;
}
p { margin: 16px 0; }
ul, ol { padding-left: 1.5rem; }
li { margin: 8px 0; }
strong { font-weight: 600; color: var(--ink); }

a {
  color: var(--accent-ink);
  text-decoration: none;
  transition: all 0.2s;
}
a:hover {
  text-decoration: underline;
}

/* Markdown formatting elements */
code {
  font-family: ui-monospace, monospace;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.15em 0.3em;
  font-size: 0.9em;
}
pre {
  overflow-x: auto;
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: #f3f4f6;
  padding: 20px;
  border-radius: 12px;
  line-height: 1.5;
}
pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: 0.9em;
}
blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent-ink);
  background: var(--soft);
  color: var(--ink);
  border-radius: 0 8px 8px 0;
}

/* Tables styling */
.table-wrap {
  overflow-x: auto;
  max-width: 100%;
  margin: 24px 0 32px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-bg);
}
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
  font-size: 14px;
}
th, td {
  border-bottom: 1px solid var(--line);
  padding: 12px 16px;
  text-align: left;
}
th {
  background: rgba(0, 0, 0, 0.15);
  font-weight: 600;
  color: var(--ink);
}
[data-theme="light"] th {
  background: rgba(0, 0, 0, 0.03);
}
tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}
[data-theme="light"] tr:hover td {
  background: rgba(0, 0, 0, 0.01);
}
tr:last-child td { border-bottom: 0; }

/* Sidebar & TOC */
.toc {
  position: sticky;
  top: 92px;
  align-self: start;
  border-left: 1px solid var(--line);
  padding-left: 20px;
  font-size: 14px;
}
.toc-title {
  color: var(--ink);
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.toc a {
  display: block;
  color: var(--muted);
  padding: 6px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toc a:hover {
  color: var(--accent-ink);
  text-decoration: none;
}

/* Charts and visuals */
.chart-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin: 32px 0;
  box-shadow: var(--shadow);
}
.chart-title {
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 16px;
  text-align: center;
  color: var(--ink);
}
.canvas-wrapper {
  position: relative;
  height: 320px;
  width: 100%;
}

/* Home / Dashboard styles */
.home {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}
.home h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--ink) 30%, var(--accent-ink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.home .description {
  font-size: 18px;
  max-width: 800px;
  margin-bottom: 40px;
}

/* KPI Cards Layout */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.kpi-card {
  background: var(--paper);
  border: 1px solid var(--paper-border);
  box-shadow: var(--shadow);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: transform 0.2s, box-shadow 0.2s;
}
.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}
[data-theme="light"] .kpi-card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}
.kpi-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.kpi-val {
  font-family: 'Outfit', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1.1;
  margin-bottom: 8px;
}
.kpi-val.success { color: var(--success); }
.kpi-val.warning { color: var(--warn); }
.kpi-val.danger { color: var(--danger); }
.kpi-sub {
  font-size: 12px;
  color: var(--muted);
}

/* Document Grid Layout */
.home-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.doc-link {
  display: block;
  background: var(--paper);
  border: 1px solid var(--paper-border);
  box-shadow: var(--shadow);
  border-radius: 16px;
  padding: 32px;
  text-decoration: none;
  color: var(--ink);
  transition: all 0.3s;
}
.doc-link:hover {
  transform: translateY(-4px);
  border-color: var(--accent-ink);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
[data-theme="light"] .doc-link:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}
.doc-link h2 {
  border: 0;
  padding: 0;
  margin: 0 0 12px;
  font-size: 20px;
  color: var(--accent-ink);
}
.doc-link p { color: var(--muted); margin: 0; font-size: 15px; }

/* Footer styling */
.footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 60px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 13px;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}
@media (max-width: 768px) {
  .layout {
    display: block;
    padding-top: 20px;
  }
  .article { padding: 24px; }
  .toc {
    display: none; /* Hide TOC on mobile screen */
  }
  .kpi-grid { grid-template-columns: 1fr; gap: 14px; }
  .home-grid { grid-template-columns: 1fr; gap: 16px; }
  .topbar { padding: 12px 16px; }
  .brand { font-size: 18px; }
}
@media print {
  .site-header, .toc, .footer, .theme-btn, .chart-card { display: none; }
  body { background: white; color: black; }
  .layout { display: block; max-width: 100%; padding: 0; }
  .article { border: 0; padding: 0; box-shadow: none; }
}