/**
 * Nova Academy - Layout System
 * Gold & Black Theme - CSS Grid & Flexbox Layout
 */

/* ============================================
   CONTAINER SYSTEM
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }

.container-fluid {
  width: 100%;
  max-width: 100%;
  padding: 0 var(--space-4);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  min-height: calc(100vh - 70px - 300px);
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* ============================================
   GRID SYSTEM
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-6);
}

/* Grid Columns */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Responsive Grid */
@media (min-width: 640px) {
  .sm\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sm\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .md\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .lg\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (min-width: 1280px) {
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .xl\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .xl\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* Grid Gap */
.gap-0 { gap: 0; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

/* ============================================
   FLEXBOX UTILITIES
   ============================================ */
.flex { display: flex; }
.inline-flex { display: inline-flex; }

/* Flex Direction */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-row-reverse { flex-direction: row-reverse; }
.flex-col-reverse { flex-direction: column-reverse; }

/* Flex Wrap */
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-wrap-reverse { flex-wrap: wrap-reverse; }

/* Justify Content */
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }

/* Align Items */
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-center { align-items: center; }
.items-baseline { align-items: baseline; }
.items-stretch { align-items: stretch; }

/* Align Self */
.self-auto { align-self: auto; }
.self-start { align-self: flex-start; }
.self-end { align-self: flex-end; }
.self-center { align-self: center; }
.self-stretch { align-self: stretch; }

/* Flex Grow/Shrink */
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-initial { flex: 0 1 auto; }
.flex-none { flex: none; }
.grow { flex-grow: 1; }
.grow-0 { flex-grow: 0; }
.shrink { flex-shrink: 1; }
.shrink-0 { flex-shrink: 0; }

/* ============================================
   SECTIONS & SPACING
   ============================================ */
.section {
  padding: var(--space-16) 0;
}

.section-sm { padding: var(--space-12) 0; }
.section-lg { padding: var(--space-20) 0; }
.section-xl { padding: var(--space-24) 0; }

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

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

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

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-card) 100%);
  border-bottom: 1px solid var(--border-dark);
  padding: var(--space-12) 0;
  margin-bottom: var(--space-8);
}

.page-header-content {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.page-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.breadcrumbs a { color: var(--text-secondary); }
.breadcrumbs a:hover { color: var(--gold-primary); }
.breadcrumbs-separator { color: var(--text-muted); }
.breadcrumbs-current { color: var(--gold-primary); }

/* ============================================
   FOOTER LAYOUT
   ============================================ */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border-dark);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

.footer-brand { max-width: 300px; }
.footer-logo { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); }
.footer-description { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.7; margin-bottom: var(--space-6); }

.social-links { display: flex; gap: var(--space-3); }
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-light);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--gold-gradient);
  border-color: transparent;
  color: var(--bg-darkest);
  transform: translateY(-2px);
}

.footer-heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.footer-links ul { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: var(--space-3); }
.footer-links a { font-size: var(--text-sm); color: var(--text-muted); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--gold-primary); }

.footer-contact ul { list-style: none; padding: 0; margin: 0; }
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.footer-contact svg {
  width: 18px;
  height: 18px;
  color: var(--gold-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-dark);
}

.copyright { font-size: var(--text-sm); color: var(--text-muted); margin: 0; }

.footer-legal { display: flex; gap: var(--space-6); }
.footer-legal a { font-size: var(--text-sm); color: var(--text-muted); }
.footer-legal a:hover { color: var(--gold-primary); }

/* ============================================
   ADMIN SIDEBAR LAYOUT
   ============================================ */
.admin-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

.admin-sidebar {
  background: var(--bg-dark);
  border-right: 1px solid var(--border-dark);
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  overflow-y: auto;
  z-index: var(--z-fixed);
}

.admin-sidebar-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-dark);
}

.admin-sidebar-nav { padding: var(--space-4); }
.admin-nav-section { margin-bottom: var(--space-6); }

.admin-nav-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0 var(--space-4);
  margin-bottom: var(--space-3);
}

.admin-nav-list { list-style: none; padding: 0; margin: 0; }
.admin-nav-item { margin-bottom: var(--space-1); }

.admin-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.admin-nav-link svg { width: 20px; height: 20px; }

.admin-nav-link:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.admin-nav-link.active {
  background: rgba(255, 215, 0, 0.1);
  color: var(--gold-primary);
  border: 1px solid var(--border-gold);
}

.admin-main {
  margin-left: 260px;
  padding: var(--space-6);
  min-height: 100vh;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-dark);
}

.admin-header-title { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: var(--font-bold); }

/* ============================================
   STATS CARDS GRID
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.stat-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-2px);
}

.stat-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: rgba(255, 215, 0, 0.1);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  color: var(--gold-primary);
  margin-bottom: var(--space-4);
}

.stat-card-icon svg { width: 24px; height: 24px; }

.stat-card-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.stat-card-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.stat-card-change {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  margin-top: var(--space-3);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.stat-card-change.positive { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.stat-card-change.negative { background: rgba(239, 68, 68, 0.15); color: var(--error); }

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 1279px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1023px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-description { margin-left: auto; margin-right: auto; }
  .hero-stats { justify-content: center; }
  .hero-image { order: -1; }
  
  .footer-top { grid-template-columns: 1fr 1fr; }
  
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sidebar { transform: translateX(-100%); transition: transform var(--transition-base); }
  .admin-sidebar.open { transform: translateX(0); }
  .admin-main { margin-left: 0; }
}

@media (max-width: 767px) {
  .nav-toggle { display: block; }
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-darkest);
    border-bottom: 1px solid var(--border-dark);
    flex-direction: column;
    gap: 0;
    padding: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-links { flex-direction: column; gap: var(--space-2); width: 100%; }
  .nav-link { padding: var(--space-3) 0; border-bottom: 1px solid var(--border-dark); width: 100%; }
  .nav-link::after { display: none; }
  
  .nav-actions {
    flex-direction: column;
    width: 100%;
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-dark);
  }
  
  .stats-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-4); text-align: center; }
  
  .section { padding: var(--space-12) 0; }
  .hero-title { font-size: var(--text-4xl); }
}

@media (max-width: 639px) {
  .hero-title { font-size: var(--text-3xl); }
  .hero-stats { flex-direction: column; gap: var(--space-6); }
  .page-title { font-size: var(--text-3xl); }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden { display: none !important; }
.invisible { visibility: hidden; }

/* Screen readers */
.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;
}