/* CSS Variables - Northern Meridian Editorial Palette */
:root {
  --color-primary: #1E3A5F;
  --color-secondary: #2F6F7E;
  --color-accent: #C07A2C;
  --color-bg: #F6F3EE;
  --color-surface: #FFFFFF;
  --color-text: #1A1D21;
  --color-muted: #4B5563;
  --color-border: #D6D0C6;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(26, 29, 33, 0.10);
  --measure: 68ch;
  --font-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
}

/* Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* Typography Scale with Clamp */
h1 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  font-family: var(--font-serif);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

p {
  max-width: var(--measure);
  margin-bottom: 1.25rem;
}

a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1.5px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

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

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Container and Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header */
header {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

header .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-serif);
}

nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: calc(var(--radius) / 2);
  transition: background-color 0.2s ease, color 0.2s ease;
}

nav a:hover {
  background-color: var(--color-bg);
  color: var(--color-secondary);
}

nav a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumbs a {
  color: var(--color-secondary);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

/* Main Content */
main {
  padding: 2.5rem 0;
  min-height: 60vh;
}

article {
  background-color: var(--color-surface);
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

@media (max-width: 767px) {
  article {
    padding: 1.5rem;
  }
}

/* Sections */
section {
  margin-bottom: 2.5rem;
}

section:last-child {
  margin-bottom: 0;
}

/* Blockquote */
blockquote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background-color: rgba(47, 111, 126, 0.05);
  border-left: 5px solid var(--color-accent);
  border-radius: calc(var(--radius) / 2);
  font-style: italic;
  color: var(--color-text);
  max-width: var(--measure);
}

blockquote p {
  margin-bottom: 0;
}

/* Aside / Checklist */
aside {
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 2rem 0;
  max-width: var(--measure);
}

aside h3 {
  margin-top: 0;
  font-size: 1.125rem;
}

aside ul {
  margin-top: 1rem;
  padding-left: 1.5rem;
}

aside li {
  margin-bottom: 0.5rem;
}

/* Table Styling */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  font-size: 0.9375rem;
}

caption {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-primary);
  text-align: left;
  padding: 1rem;
  background-color: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
}

thead {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

thead th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

tbody tr {
  border-bottom: 1px solid var(--color-border);
}

tbody tr:nth-child(even) {
  background-color: rgba(246, 243, 238, 0.5);
}

tbody tr:hover {
  background-color: rgba(47, 111, 126, 0.08);
}

tbody td {
  padding: 1rem;
  vertical-align: top;
}

@media (min-width: 768px) {
  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

/* Details / Summary (Accordion) */
details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px rgba(26, 29, 33, 0.06);
}

details[open] {
  border-color: var(--color-secondary);
}

summary {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: color 0.2s ease;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: '▸';
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
  display: inline-block;
}

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

summary:hover {
  color: var(--color-secondary);
}

summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: calc(var(--radius) / 2);
}

details p {
  margin-top: 1rem;
  padding-left: 2rem;
}

/* Lists */
ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.75rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: 2rem 0;
  margin-top: 4rem;
  text-align: center;
}

footer p {
  margin: 0;
  max-width: none;
}

/* Responsive Grid Layout - Editorial Two-Column at 1024px */
@media (min-width: 1024px) {
  main.container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 3rem;
    align-items: start;
  }

  article {
    grid-column: 1;
  }

  aside {
    grid-column: 2;
    position: sticky;
    top: 6rem;
  }
}

/* Focus Visible for All Interactive Elements */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* Utility: Visually Hidden (for screen readers) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}