/* CLA Teacher's Manual - Core Styles
   ADA Compliant | Responsive | Modern Design
   ========================================== */

/* CSS Custom Properties */
:root {
  /* Colors - WCAG AA compliant */
  --color-primary: #1e3a5f;
  --color-primary-dark: #152a45;
  --color-primary-light: #2d5a8a;
  --color-accent: #c75000;
  --color-accent-light: #e86a1a;
  --color-success: #1a7f37;
  --color-warning: #9a6700;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-card: #ffffff;
  --color-text: #1f2328;
  --color-text-muted: #57606a;
  --color-border: #d0d7de;
  --color-border-light: #e8ecef;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono: 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

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

  /* Layout */
  --max-width: 1200px;
  --content-width: 800px;
  --sidebar-width: 280px;
  --nav-height: 64px;

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --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);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Skip Link - ADA Compliance */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 9999;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-md);
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Focus Styles - ADA Compliance */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--space-md);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-primary-dark);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; border-bottom: 2px solid var(--color-border-light); padding-bottom: var(--space-sm); }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

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

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

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

/* Lists */
ul, ol {
  margin-top: 0;
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

li {
  margin-bottom: var(--space-xs);
}

li::marker {
  color: var(--color-primary);
}

/* Layout Components */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header / Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: var(--nav-height);
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.site-title a {
  color: white;
  text-decoration: none;
}

.site-title a:hover {
  color: rgba(255,255,255,0.9);
}

/* Main Navigation */
.main-nav {
  display: none;
}

.main-nav ul {
  display: flex;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: background var(--transition-fast);
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: rgba(255,255,255,0.15);
  color: white;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  color: white;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

.menu-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.menu-toggle[aria-expanded="false"] .icon-close {
  display: none;
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-primary-dark);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav li {
  margin-bottom: var(--space-xs);
}

.mobile-nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.mobile-nav a:hover,
.mobile-nav a[aria-current="page"] {
  background: rgba(255,255,255,0.1);
  color: white;
}

/* Secondary Navigation (Dropdowns) */
.nav-section {
  position: relative;
}

.nav-section > button {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  color: rgba(255,255,255,0.9);
  font-weight: 500;
  font-size: 0.9375rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.nav-section > button:hover {
  background: rgba(255,255,255,0.15);
}

.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-sm) 0;
  z-index: 50;
}

.nav-section:focus-within .nav-dropdown,
.nav-dropdown.is-open {
  display: block;
}

.nav-dropdown a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
}

.nav-dropdown a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* Main Content Area */
.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

/* Page with Sidebar Layout */
.page-with-sidebar {
  display: grid;
  gap: var(--space-xl);
}

/* Sidebar Navigation */
.sidebar {
  display: none;
}

.sidebar-nav {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-xl));
}

.sidebar-nav h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  border: none;
  padding: 0;
  margin-bottom: var(--space-sm);
}

.sidebar-nav ul {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-lg) 0;
}

.sidebar-nav a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  border-left: 3px solid transparent;
  margin-left: -3px;
}

.sidebar-nav a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.sidebar-nav a[aria-current="page"] {
  background: var(--color-bg-alt);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 600;
}

/* Content Sections */
.content-section {
  margin-bottom: var(--space-2xl);
}

/* Cards */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.card-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.card-title {
  margin: 0;
  font-size: 1.125rem;
}

.card-subtitle {
  margin: var(--space-xs) 0 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-link .card {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-link .card > p:last-child {
  margin-top: auto;
  margin-bottom: 0;
}

.card-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-link:hover .card {
  border-color: var(--color-primary-light);
}

/* Card Grid */
.card-grid {
  display: grid;
  gap: var(--space-md);
}

/* Info Boxes */
.info-box {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.info-box--tip {
  background: #e6f4ea;
  border-left: 4px solid var(--color-success);
}

.info-box--warning {
  background: #fff8e6;
  border-left: 4px solid var(--color-warning);
}

.info-box--note {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-primary);
}

.info-box-title {
  font-weight: 600;
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.info-box p:last-child {
  margin-bottom: 0;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg-alt);
  font-weight: 600;
  color: var(--color-primary-dark);
}

tr:hover {
  background: var(--color-bg-alt);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) + 4px);
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid white;
}

.timeline-time {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.timeline-content h4 {
  margin-bottom: var(--space-xs);
}

/* Accordion */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-xl);
}

.accordion-item {
  border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-card);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-text);
}

.accordion-trigger:hover {
  background: var(--color-bg-alt);
}

.accordion-icon {
  transition: transform var(--transition-normal);
}

.accordion-trigger[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-panel {
  display: none;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-alt);
}

.accordion-panel.is-open {
  display: block;
}

/* Tags / Badges */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag--remote {
  background: #ddf4ff;
  color: #0969da;
}

.tag--in-person {
  background: #dafbe1;
  color: #1a7f37;
}

.tag--assessment {
  background: #ffebe9;
  color: #cf222e;
}

.tag--ps {
  background: #fff8c5;
  color: #9a6700;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
}

.breadcrumbs a {
  color: var(--color-text-muted);
}

.breadcrumbs span {
  color: var(--color-text-muted);
}

/* Page Header */
.page-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
}

.page-header .lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* Footer */
.site-footer {
  margin-top: auto;
  padding: var(--space-xl) var(--space-md);
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Utility Classes */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-0 { margin-bottom: 0; }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* Responsive Breakpoints */

/* Tablet and up */
@media (min-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.875rem; }

  .main-content {
    padding: var(--space-2xl) var(--space-lg);
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-with-sidebar {
    grid-template-columns: var(--sidebar-width) 1fr;
  }

  .sidebar {
    display: block;
  }

  .mobile-nav-toggle {
    display: none;
  }
}

/* Desktop and up */
@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }

  .main-nav {
    display: block;
  }

  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .card-grid--2col {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Large Desktop */
@media (min-width: 1280px) {
  .main-content {
    padding: var(--space-2xl);
  }
}

/* Print Styles */
@media print {
  .site-header,
  .sidebar,
  .skip-link,
  .breadcrumbs {
    display: none !important;
  }

  .main-content {
    max-width: none;
    padding: 0;
  }

  a {
    text-decoration: none;
    color: inherit;
  }

  .card {
    break-inside: avoid;
    border: 1px solid #ccc;
  }
}

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

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000;
    --color-text-muted: #000;
  }

  .card {
    border-width: 2px;
  }

  a {
    text-decoration-thickness: 2px;
  }
}