/* E350 Travel Hub - Main Stylesheet */

/* CSS Variables */
:root {
  --color-bg: #fafafa;
  --color-bg-alt: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-primary: #1e3a5f;
  --color-primary-light: #2d5a8e;
  --color-accent: #d4a843;
  --color-border: #e5e7eb;
  --color-code-bg: #f3f4f6;
  --color-table-header: #1e3a5f;
  --color-table-alt: #f9fafb;
  --color-link: #2d5a8e;
  --color-link-hover: #1e3a5f;
  --sidebar-width: 260px;
  --max-width: 900px;
  --header-height: 64px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  /* Horizontal page gutter. Full-bleed blocks (e.g. the homepage hero) pull
     out by exactly this, so it must change together with the container
     padding or they drift apart and force a horizontal scrollbar. */
  --gutter: var(--spacing-md);
  --spacing-xl: 2rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111827;
    --color-bg-alt: #1f2937;
    --color-text: #f3f4f6;
    --color-text-muted: #9ca3af;
    --color-primary: #60a5fa;
    --color-primary-light: #93c5fd;
    --color-accent: #fbbf24;
    --color-border: #374151;
    --color-code-bg: #1f2937;
    --color-table-header: #1e3a5f;
    --color-table-alt: #1f2937;
    --color-link: #93c5fd;
    --color-link-hover: #bfdbfe;
  }
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-link-hover); text-decoration: underline; }

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

/* Container */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.site-title:hover { text-decoration: none; color: var(--color-primary-light); }

.site-title .icon { font-size: 1.5rem; }

/* Navigation */
.main-nav { position: relative; }

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item { position: relative; }

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover {
  background: var(--color-code-bg);
  color: var(--color-primary);
  text-decoration: none;
}

/* Dropdown */
.has-dropdown .dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  padding: var(--spacing-sm) 0;
  margin-top: var(--spacing-xs);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 50;
}

.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* The last two nav groups sit against the right edge, so a left-anchored
   dropdown would hang off the viewport and force a horizontal scrollbar.
   The dropdown is 220px wide, so it has to flip over well before the edge. */
.nav-item:nth-last-child(-n+2) .dropdown { left: auto; right: 0; }

.dropdown li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
  color: var(--color-text);
  white-space: nowrap;
}

.dropdown li a:hover {
  background: var(--color-code-bg);
  color: var(--color-primary);
  text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: var(--spacing-sm); }
.hamburger { display: block; width: 24px; height: 2px; background: var(--color-text); position: relative; transition: background var(--transition); }
.hamburger::before, .hamburger::after { content: ''; position: absolute; left: 0; width: 100%; height: 2px; background: var(--color-text); transition: transform var(--transition); }
.hamburger::before { top: -7px; }
.hamburger::after { bottom: -7px; }

/* Open state drives the X from CSS. Pseudo-elements cannot be reached with
   querySelector, so this must not be animated from JavaScript. */
.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { transform: rotate(-45deg); }

/* Main */
.site-main { padding: var(--spacing-xl) 0; }

/* Breadcrumbs */
.breadcrumbs { margin-bottom: var(--spacing-lg); font-size: 0.875rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: var(--spacing-xs); list-style: none; margin: 0; padding: 0; }
.breadcrumbs li { display: flex; align-items: center; color: var(--color-text-muted); }
.breadcrumbs li:not(:first-child)::before { content: '/'; margin: 0 var(--spacing-sm); color: var(--color-text-muted); }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs li[aria-current="page"] { color: var(--color-text); font-weight: 500; }

/* Page Layout */
/* min-width:0 on the content column is load-bearing: without it the `1fr`
   track is sized by its widest child (a wide Markdown table), which pushes the
   whole grid past the viewport instead of letting the table scroll. */
.page-layout { display: grid; grid-template-columns: var(--sidebar-width) 1fr; gap: var(--spacing-xl); }
.page-content { min-width: 0; }

/* Sidebar */
.sidebar { position: sticky; top: calc(var(--header-height) + var(--spacing-lg)); height: fit-content; max-height: calc(100vh - var(--header-height) - var(--spacing-xl)); overflow-y: auto; border-right: 1px solid var(--color-border); padding-right: var(--spacing-lg); }

.section-nav ul { list-style: none; margin: 0; padding: 0; }
.section-nav li { margin-bottom: var(--spacing-xs); }
.section-nav a { display: block; padding: var(--spacing-sm) var(--spacing-md); font-size: 0.875rem; color: var(--color-text-muted); border-radius: var(--radius-sm); transition: all var(--transition); }
.section-nav a:hover { color: var(--color-primary); background: var(--color-code-bg); text-decoration: none; }
.section-nav a.active { color: var(--color-primary); background: var(--color-code-bg); font-weight: 600; }

/* Page Content */
.page-header { margin-bottom: var(--spacing-xl); padding-bottom: var(--spacing-md); border-bottom: 1px solid var(--color-border); }
.page-header h1 { margin: 0 0 var(--spacing-sm); font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.page-description { margin: 0; color: var(--color-text-muted); font-size: 1.1rem; }
.page-meta { margin: var(--spacing-sm) 0 0; font-size: 0.875rem; color: var(--color-text-muted); }

.markdown-content { font-size: 1rem; line-height: 1.8; }

/* Typography */
h1, h2, h3, h4, h5, h6 { margin-top: var(--spacing-xl); margin-bottom: var(--spacing-md); font-weight: 600; line-height: 1.3; color: var(--color-text); }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; padding-bottom: var(--spacing-xs); border-bottom: 1px solid var(--color-border); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

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

ul, ol { margin: 0 0 var(--spacing-md); padding-left: var(--spacing-xl); }
li { margin-bottom: var(--spacing-xs); }
li > p:last-child { margin-bottom: 0; }

/* Links */
markdown-content a { border-bottom: 1px solid transparent; transition: border-color var(--transition); }
.markdown-content a:hover { border-bottom-color: var(--color-link); text-decoration: none; }

/* Code */
code { font-family: var(--font-mono); font-size: 0.9em; background: var(--color-code-bg); padding: 0.125em 0.375em; border-radius: var(--radius-sm); color: var(--color-primary); }
pre { margin: var(--spacing-md) 0; padding: var(--spacing-md); background: var(--color-code-bg); border-radius: var(--radius-md); overflow-x: auto; border: 1px solid var(--color-border); }
pre code { background: none; padding: 0; font-size: 0.875rem; line-height: 1.6; color: var(--color-text); }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: var(--spacing-md) 0; font-size: 0.875rem; overflow-x: auto; display: block; }
th, td { padding: var(--spacing-sm) var(--spacing-md); text-align: left; border: 1px solid var(--color-border); }
th { background: var(--color-table-header); color: white; font-weight: 600; position: sticky; top: 0; }
tr:nth-child(even) td { background: var(--color-table-alt); }
tr:hover td { background: var(--color-code-bg); }

/* Blockquotes */
blockquote { margin: var(--spacing-md) 0; padding: var(--spacing-md) var(--spacing-lg); border-left: 4px solid var(--color-accent); background: var(--color-code-bg); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-style: italic; color: var(--color-text-muted); }

/* Horizontal rule */
hr { border: none; border-top: 1px solid var(--color-border); margin: var(--spacing-xl) 0; }

/* Footer */
.site-footer { padding: var(--spacing-xl) 0; border-top: 1px solid var(--color-border); background: var(--color-bg-alt); margin-top: var(--spacing-xl); }
.site-footer p { margin: 0 0 var(--spacing-xs); text-align: center; color: var(--color-text-muted); font-size: 0.875rem; }
.footer-links { display: flex; justify-content: center; gap: var(--spacing-md); margin: 0; }
.footer-links a { color: var(--color-text-muted); font-size: 0.875rem; }
.footer-links a:hover { color: var(--color-primary); }
.footer-links span { color: var(--color-text-muted); }

/* Tables with special classes */
.table-simple { font-size: 0.8rem; }
.table-simple th, .table-simple td { padding: 0.375rem 0.5rem; }

/* Alert boxes */
.alert { padding: var(--spacing-md) var(--spacing-lg); margin: var(--spacing-md) 0; border-radius: var(--radius-md); border-left: 4px solid; }
.alert-info { background: #eff6ff; border-color: #3b82f6; }
.alert-warning { background: #fffbeb; border-color: #f59e0b; }
.alert-danger { background: #fef2f2; border-color: #ef4444; }
.alert-success { background: #f0fdf4; border-color: #22c55e; }

/* Tags */
.tag { display: inline-block; padding: 0.125rem 0.5rem; font-size: 0.75rem; font-weight: 600; border-radius: 9999px; background: var(--color-code-bg); color: var(--color-text-muted); margin-right: var(--spacing-xs); }
.tag-verify { background: #fffbeb; color: #f59e0b; }
.tag-dog { background: #fef3c7; color: #d97706; }
.tag-bus { background: #dbeafe; color: #2563eb; }
.tag-complete { background: #dcfce7; color: #16a34a; }

/* Responsive */
@media (max-width: 1024px) {
  .page-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; border-right: none; border-bottom: 1px solid var(--color-border); padding: 0 0 var(--spacing-md); margin-bottom: var(--spacing-lg); }
  .section-nav ul { display: flex; flex-wrap: wrap; gap: var(--spacing-xs); }
  .section-nav li { margin: 0; }
  .section-nav a { padding: var(--spacing-xs) var(--spacing-sm); }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-list { position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: var(--spacing-md); background: var(--color-bg-alt); border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-lg); display: none; }
  .nav-list.open { display: flex; }
  .nav-item { width: 100%; }
  .has-dropdown .dropdown { position: static; box-shadow: none; border: none; background: var(--color-code-bg); opacity: 1; visibility: visible; transform: none; display: none; padding-left: var(--spacing-md); }
  .has-dropdown.open .dropdown { display: block; }
  .page-header h1 { font-size: 1.5rem; }
  table { font-size: 0.75rem; }
  th, td { padding: var(--spacing-xs) var(--spacing-sm); }
}

@media (max-width: 480px) {
  :root { --gutter: var(--spacing-sm); }
  .container { padding: 0 var(--gutter); }
  .site-title .text { display: none; }
  .page-header h1 { font-size: 1.25rem; }
  .markdown-content { font-size: 0.9375rem; }
}

/* Print styles */
@media print {
  .site-header, .sidebar, .site-footer, .nav-toggle { display: none !important; }
  .page-layout { grid-template-columns: 1fr; }
  .site-main { padding: 0; }
  .markdown-content { font-size: 11pt; line-height: 1.6; }
  a { text-decoration: none; color: inherit; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #666; }
  table { page-break-inside: avoid; }
  pre, blockquote { page-break-inside: avoid; }
}