/* ============================================
   BrightPath Learning — Main Stylesheet
   A K-12 Educational Resource Website
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Brand Colors */
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-accent: #F59E0B;
  --color-accent-dark: #D97706;
  --color-accent-light: #FEF3C7;
  --color-success: #059669;
  --color-success-light: #D1FAE5;

  /* Neutrals */
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;

  /* Text */
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-text-inverse: #FFFFFF;

  /* Typography */
  --font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;

  /* Borders & Shadows */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-8));
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--space-4);
}

/* ---------- Utility ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.content-narrow {
  max-width: 780px;
}

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

.bg-light {
  background-color: var(--color-gray-50);
}

.bg-primary-light {
  background-color: var(--color-primary-light);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  z-index: 1000;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  color: white;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-8);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.5;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: white;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-gray-300);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-gray-900);
  flex-shrink: 0;
}

.logo:hover {
  color: var(--color-gray-900);
}

.logo-icon {
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
}

.logo-text strong {
  font-weight: 800;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  color: var(--color-gray-600);
  font-weight: 500;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  font-weight: 600;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 110;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  position: relative;
  transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-gray-700);
  left: 0;
  transition: all var(--transition-fast);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- Hero Section ---------- */
.hero {
  padding: var(--space-20) 0;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #FFFFFF 50%, var(--color-accent-light) 100%);
  overflow: hidden;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  color: var(--color-gray-900);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-gray-600);
  margin-bottom: var(--space-10);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-illustration {
  flex: 1;
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.15;
}

.shape-1 {
  width: 300px;
  height: 300px;
  background: var(--color-primary);
  top: -30px;
  right: -30px;
  animation: float 6s ease-in-out infinite;
}

.shape-2 {
  width: 200px;
  height: 200px;
  background: var(--color-accent);
  bottom: -20px;
  left: 20px;
  animation: float 8s ease-in-out infinite reverse;
}

.shape-3 {
  width: 120px;
  height: 120px;
  background: var(--color-success);
  top: 60px;
  left: 60px;
  animation: float 7s ease-in-out infinite 1s;
}

.hero-books {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  justify-content: center;
}

.book {
  font-size: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 90px;
  height: 90px;
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  animation: float 5s ease-in-out infinite;
}

.book-1 { animation-delay: 0s; }
.book-2 { animation-delay: 0.5s; }
.book-3 { animation-delay: 1s; }
.book-4 { animation-delay: 1.5s; }
.book-5 { animation-delay: 2s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Page Hero ---------- */
.page-hero {
  padding: var(--space-16) 0 var(--space-12);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent-light));
  text-align: center;
}

.page-hero h1 {
  margin-bottom: var(--space-4);
}

.page-hero p {
  font-size: var(--font-size-xl);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Stats Bar ---------- */
.stats-bar {
  padding: var(--space-10) 0;
  background: var(--color-gray-900);
  color: white;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.2;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* ---------- Sections ---------- */
.section {
  padding: var(--space-20) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

.section-cta {
  text-align: center;
  margin-top: var(--space-10);
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-8);
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.card-title {
  margin-bottom: var(--space-3);
  font-size: var(--font-size-xl);
}

.card-desc {
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
}

.card-link {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-primary);
}

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

/* ---------- Grade Bands ---------- */
.grade-bands {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.grade-band {
  text-align: center;
  padding: var(--space-10) var(--space-8);
  background: white;
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-gray-200);
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--color-text);
}

.grade-band:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  color: var(--color-text);
}

.grade-band-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.grade-band h3 {
  margin-bottom: var(--space-2);
}

.grade-band p {
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.grade-band-tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

/* ---------- Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8);
}

.feature-item {
  text-align: center;
  padding: var(--space-6);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.feature-item h3 {
  margin-bottom: var(--space-3);
}

.feature-item p {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

/* ---------- Testimonials ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8);
}

.testimonial-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.testimonial-card p {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--color-gray-700);
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

.testimonial-card footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.testimonial-card footer strong {
  color: var(--color-gray-900);
}

.testimonial-card footer span {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ---------- Newsletter ---------- */
.newsletter {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: var(--space-16) 0;
}

.newsletter-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  color: white;
}

.newsletter-inner h2 {
  color: white;
  margin-bottom: var(--space-4);
}

.newsletter-inner > p {
  opacity: 0.9;
  margin-bottom: var(--space-8);
}

.newsletter-form {
  display: flex;
  gap: var(--space-3);
  max-width: 480px;
  margin: 0 auto var(--space-4);
}

.newsletter-form input[type="email"] {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background: rgba(255,255,255,0.15);
  color: white;
  outline: none;
  transition: border-color var(--transition-fast);
}

.newsletter-form input[type="email"]::placeholder {
  color: rgba(255,255,255,0.6);
}

.newsletter-form input[type="email"]:focus {
  border-color: white;
  background: rgba(255,255,255,0.25);
}

.newsletter-form .btn-primary {
  background: white;
  color: var(--color-primary);
  border-color: white;
  flex-shrink: 0;
}

.newsletter-form .btn-primary:hover {
  background: var(--color-gray-100);
}

.newsletter-note {
  font-size: var(--font-size-xs);
  opacity: 0.7;
}

/* ---------- Subject Detail ---------- */
.subject-header {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.subject-icon-large {
  font-size: 4rem;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-xl);
  flex-shrink: 0;
}

.subject-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  margin-bottom: 0;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.topic-card {
  background: white;
  border-radius: var(--radius-md);
  padding: var(--space-6);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base);
}

.topic-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.topic-card h4 {
  margin-bottom: var(--space-2);
  color: var(--color-gray-900);
}

.topic-grade {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.topic-card p {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ---------- Grade Detail ---------- */
.grade-detail-header {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.grade-detail-icon {
  font-size: 3.5rem;
}

.grade-detail-meta {
  color: var(--color-gray-500);
  font-size: var(--font-size-lg);
  margin-bottom: 0;
}

.grade-intro {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  margin-bottom: var(--space-10);
  max-width: 800px;
}

.grade-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.grade-item {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.grade-item summary {
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-lg);
  transition: background var(--transition-fast);
  list-style: none;
}

.grade-item summary::-webkit-details-marker {
  display: none;
}

.grade-item summary::after {
  content: '▸';
  font-size: var(--font-size-lg);
  color: var(--color-gray-400);
  transition: transform var(--transition-fast);
}

.grade-item[open] summary::after {
  transform: rotate(90deg);
}

.grade-item summary:hover {
  background: var(--color-gray-50);
}

.grade-age {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  font-weight: 400;
  margin-left: var(--space-3);
}

.grade-item-content {
  padding: 0 var(--space-6) var(--space-6);
}

.grade-item-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.grade-item-content li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-gray-100);
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

.grade-item-content li:last-child {
  border-bottom: none;
}

.grade-item-content li strong {
  color: var(--color-gray-800);
}

/* ---------- Resource Cards ---------- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

.resource-card {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
  transition: all var(--transition-base);
}

.resource-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.resource-card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-4);
}

.resource-card h3 {
  margin-bottom: var(--space-3);
}

.resource-card p {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

.resource-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.resource-tags li {
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.resource-badge {
  display: inline-block;
  background: var(--color-success-light);
  color: var(--color-success);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ---------- Values Grid ---------- */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8);
}

.value-card {
  text-align: center;
  padding: var(--space-8);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.value-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.value-card h3 {
  margin-bottom: var(--space-3);
}

.value-card p {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

/* ---------- Team ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-8);
}

.team-card {
  text-align: center;
  padding: var(--space-8);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.team-avatar {
  font-size: 3.5rem;
  margin-bottom: var(--space-4);
}

.team-card h3 {
  margin-bottom: var(--space-1);
}

.team-role {
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
}

.team-card p:last-child {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

/* ---------- Standards List ---------- */
.standards-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.standards-list li {
  padding: var(--space-4) var(--space-6);
  background: var(--color-gray-50);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-primary);
}

.lead-text {
  font-size: var(--font-size-xl);
  line-height: 1.7;
  color: var(--color-gray-700);
}

/* ---------- Contact ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-12);
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
}

.required {
  color: #EF4444;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-note {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  margin-top: var(--space-2);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact-info-card {
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.contact-info-card h3 {
  margin-bottom: var(--space-6);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact-details li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.contact-detail-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-details strong {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-gray-800);
}

.contact-details a {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
}

.faq-item {
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-3) 0;
}

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

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  padding: var(--space-2) 0;
}

.faq-item p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  padding: var(--space-2) 0;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: var(--space-4);
}

.footer-brand .logo-text {
  color: white;
}

.footer-brand > p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.footer-links h4 {
  color: white;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-8);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-2);
}

.footer-compliance {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
}

.footer-compliance span {
  display: inline-flex;
  align-items: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }

  .mobile-menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    padding: var(--space-8);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 99;
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    gap: var(--space-2);
  }

  .nav-link {
    font-size: var(--font-size-lg);
    padding: var(--space-4);
    width: 100%;
    display: block;
  }

  .hero {
    padding: var(--space-12) 0;
  }

  .hero .container {
    flex-direction: column;
    gap: var(--space-10);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-illustration {
    min-height: 200px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .card-grid,
  .topic-grid,
  .resource-grid,
  .features-grid,
  .testimonial-grid,
  .values-grid,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .grade-bands {
    grid-template-columns: 1fr;
  }

  .subject-header {
    flex-direction: column;
    text-align: center;
  }

  .grade-detail-header {
    flex-direction: column;
    text-align: center;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section {
    padding: var(--space-12) 0;
  }

  .page-hero {
    padding: var(--space-10) 0 var(--space-8);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .stat-number {
    font-size: var(--font-size-2xl);
  }

  .book {
    width: 64px;
    height: 64px;
    font-size: 2rem;
  }
}

/* ---------- Print Styles ---------- */
@media print {
  .site-header,
  .mobile-menu-toggle,
  .newsletter,
  .hero-illustration,
  .skip-link {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: black;
    background: white;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .section {
    padding: 1rem 0;
  }

  .card, .topic-card, .resource-card {
    border: 1px solid #ccc;
    box-shadow: none;
    break-inside: avoid;
  }
}

/* ---------- Focus Styles for Accessibility ---------- */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

/* 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 */
@media (prefers-contrast: high) {
  :root {
    --color-gray-200: #999;
    --color-gray-400: #666;
    --color-gray-500: #555;
    --color-gray-600: #333;
  }

  .card, .topic-card, .resource-card {
    border-width: 2px;
  }
}