/* ============================================================
   Design System: CSS Variables
   ============================================================ */
:root {
  /* Brand Colors */
  --color-primary: #14283C;
  --color-secondary: #283C50;

  /* Accents */
  --color-accent-amber: #E89B2C;
  --color-accent-copper: #A65E3B;
  --color-accent-teal: #3FB8AF;

  /* Neutrals */
  --color-graphite: #282828;
  --color-graphite-soft: #3C3C3C;
  --color-offwhite: #F2F2F2;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2.25rem;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.6;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
}

/* ============================================================
   Accessibility Utilities
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Global Styles
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-graphite);
  background-color: #ffffff;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  line-height: var(--line-height-tight);
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-accent-amber);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

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

/* ============================================================
   Navigation
   ============================================================ */
.navbar {
  background-color: var(--color-primary);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.navbar-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.navbar-logo a {
  display: flex;
  align-items: center;
}

.navbar-logo-img {
  height: 36px;
  width: auto;
}

.navbar-attribution {
  margin-left: auto;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar-attribution:hover {
  color: var(--color-accent-amber);
}

.navbar-attribution:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: var(--spacing-xl) 0;
  margin-top: auto;
}

.footer-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-content {
  text-align: center;
}

.footer-content p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.75);
}

/* ============================================================
   Main Content
   ============================================================ */
#main-content {
  min-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

/* ============================================================
   Landing Page
   ============================================================ */
.landing-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
  text-align: center;
  flex: 1;
}

.landing-logo-container {
  margin-bottom: var(--spacing-2xl);
}

.landing-logo {
  width: 280px;
  max-width: 100%;
  height: auto;
}

.landing-body {
  max-width: 680px;
  width: 100%;
}

.landing-body p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  color: var(--color-graphite-soft);
  margin-bottom: var(--spacing-lg);
}

.landing-body p:last-of-type {
  margin-bottom: var(--spacing-2xl);
}

.landing-cta {
  margin-top: var(--spacing-xl);
}

/* Separator between pinned paragraphs and expandable section */
.landing-divider {
  border: none;
  border-top: 1px solid var(--color-secondary);
  width: 100%;
  margin: var(--spacing-xl) 0;
  opacity: 0.4;
}

/* ============================================================
   Show More / Expandable
   ============================================================ */
.landing-show-more {
  margin-bottom: var(--spacing-xl);
}

.show-more-btn {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-accent-amber);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.show-more-btn:hover {
  color: var(--color-accent-copper);
}

.show-more-btn:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

.landing-expandable {
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.landing-expandable p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  color: var(--color-graphite-soft);
  margin-bottom: var(--spacing-lg);
}

.landing-expandable ul {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  color: var(--color-graphite-soft);
  margin: 0 0 var(--spacing-lg) 0;
  padding-left: var(--spacing-xl);
}

.landing-expandable ul li {
  margin-bottom: var(--spacing-sm);
}

/* ============================================================
   GitHub Button (matches philbudden.github.com .project-link)
   ============================================================ */
.project-link {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-accent-amber);
  color: var(--color-primary);
  border-radius: 4px;
  font-weight: 500;
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.project-link:hover {
  background-color: var(--color-accent-copper);
  color: #ffffff;
}

.project-link:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .landing-logo {
    width: 200px;
  }

  .landing-hero {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .landing-body p {
    font-size: var(--font-size-base);
  }
}

/* ============================================================
   Documentation Index
   ============================================================ */
.docs-index {
  padding: var(--spacing-3xl) var(--spacing-lg);
  flex: 1;
}

.docs-index-container {
  max-width: 720px;
  margin: 0 auto;
}

.docs-index-header {
  margin-bottom: var(--spacing-2xl);
}

.docs-index-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.docs-index-header p {
  font-size: var(--font-size-lg);
  color: var(--color-graphite-soft);
  margin: 0;
}

.docs-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.docs-index-card {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  border: 1px solid rgba(20, 40, 60, 0.12);
  border-radius: 6px;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.docs-index-card:hover {
  border-color: var(--color-accent-amber);
  box-shadow: 0 2px 8px rgba(232, 155, 44, 0.12);
  color: inherit;
}

.docs-index-card:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

.docs-index-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.docs-index-card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-graphite-soft);
  flex: 1;
  line-height: var(--line-height-normal);
}

.docs-index-card-arrow {
  color: var(--color-accent-amber);
  font-size: var(--font-size-lg);
  margin-left: auto;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.docs-index-card:hover .docs-index-card-arrow {
  transform: translateX(3px);
}

/* ============================================================
   Documentation Page Layout
   ============================================================ */
.docs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
  gap: var(--spacing-3xl);
  align-items: start;
  flex: 1;
}

/* Sidebar */
.docs-sidebar {
  position: sticky;
  top: calc(60px + var(--spacing-xl));
}

.docs-sidebar-heading {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  text-decoration: none;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(20, 40, 60, 0.15);
}

.docs-sidebar-heading:hover {
  color: var(--color-accent-amber);
}

.docs-sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.docs-sidebar-nav a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-graphite-soft);
  text-decoration: none;
  border-radius: 4px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.docs-sidebar-nav a:hover {
  background-color: rgba(20, 40, 60, 0.06);
  color: var(--color-primary);
}

.docs-sidebar-nav a.active {
  background-color: rgba(232, 155, 44, 0.12);
  color: var(--color-accent-amber);
  font-weight: 500;
}

.docs-sidebar-nav a:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

/* Content area */
.docs-content {
  min-width: 0;
}

.docs-content-header {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid rgba(20, 40, 60, 0.1);
}

.docs-content-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.docs-content-description {
  font-size: var(--font-size-lg);
  color: var(--color-graphite-soft);
  margin: 0;
}

/* Doc content typography */
.docs-content h2 {
  font-size: var(--font-size-2xl);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid rgba(20, 40, 60, 0.1);
}

.docs-content h3 {
  font-size: var(--font-size-xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.docs-content p,
.docs-content li {
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-graphite-soft);
}

.docs-content ul,
.docs-content ol {
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.docs-content li {
  margin-bottom: var(--spacing-xs);
}

.docs-content blockquote {
  margin: 0 0 var(--spacing-lg) 0;
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 3px solid var(--color-accent-amber);
  background-color: rgba(232, 155, 44, 0.05);
  color: var(--color-graphite-soft);
  font-style: italic;
}

.docs-content blockquote p {
  margin: 0;
}

.docs-content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.875em;
  background-color: rgba(20, 40, 60, 0.06);
  padding: 0.15em 0.35em;
  border-radius: 3px;
  color: var(--color-primary);
}

.docs-content pre {
  background-color: var(--color-primary);
  border-radius: 6px;
  padding: var(--spacing-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.docs-content pre code {
  background: none;
  padding: 0;
  color: var(--color-offwhite);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.docs-content th {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
}

.docs-content td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid rgba(20, 40, 60, 0.1);
  vertical-align: top;
}

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

.docs-content tr:nth-child(even) td {
  background-color: rgba(20, 40, 60, 0.03);
}

/* Pagination between docs */
.docs-pagination {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(20, 40, 60, 0.1);
}

.docs-pagination-link {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  text-decoration: none;
  padding: var(--spacing-md);
  border: 1px solid rgba(20, 40, 60, 0.12);
  border-radius: 6px;
  max-width: 240px;
  transition: border-color var(--transition-fast);
}

.docs-pagination-link:hover {
  border-color: var(--color-accent-amber);
  color: inherit;
}

.docs-pagination-next {
  margin-left: auto;
  text-align: right;
}

.docs-pagination-label {
  font-size: var(--font-size-sm);
  color: var(--color-accent-amber);
  font-weight: 500;
}

.docs-pagination-title {
  font-size: var(--font-size-base);
  color: var(--color-primary);
  font-weight: 600;
}

/* ============================================================
   Landing Page — Docs Link
   ============================================================ */
.landing-docs-nav {
  margin-bottom: var(--spacing-2xl);
}

.landing-docs-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-graphite-soft);
  text-decoration: none;
  letter-spacing: 0.03em;
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid rgba(20, 40, 60, 0.2);
  border-radius: 20px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.landing-docs-link:hover {
  color: var(--color-accent-amber);
  border-color: var(--color-accent-amber);
}

.landing-docs-link:focus {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}

/* ============================================================
   Responsive — Docs
   ============================================================ */
@media (max-width: 768px) {
  .docs-layout {
    grid-template-columns: 1fr;
    padding: var(--spacing-xl) var(--spacing-md);
    gap: var(--spacing-xl);
  }

  .docs-sidebar {
    position: static;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(20, 40, 60, 0.1);
  }

  .docs-index {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .docs-index-card {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }

  .docs-index-card-desc {
    flex-basis: 100%;
  }

  .docs-index-card-arrow {
    display: none;
  }

  .docs-content h2 {
    font-size: var(--font-size-xl);
  }

  .docs-pagination {
    flex-direction: column;
  }

  .docs-pagination-link {
    max-width: 100%;
  }

  .docs-pagination-next {
    margin-left: 0;
    text-align: left;
  }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
  .navbar,
  .site-footer {
    display: none;
  }

  .docs-sidebar {
    display: none;
  }

  .docs-layout {
    grid-template-columns: 1fr;
  }
}