/* css/design-system.css */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400..700;1,400..700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --eb-navy: #0F1C3F;
  --eb-crimson: #B91C2C;
  --eb-bg-light: #F8FAFC;
  --eb-body-light: #334155;
  --eb-border-light: #E2E8F0;
  
  --eb-bg-dark: #0B1220;
  --eb-body-dark: #cbd5e1;
  --eb-border-dark: #1E293B;
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', 'Georgia', serif;
}

/* Base resets & typography */
html {
  background-color: var(--eb-bg-light);
  color: var(--eb-body-light);
  font-family: var(--font-sans);
  transition: background-color 0.2s, color 0.2s;
  scroll-behavior: smooth;
}

body {
  background-color: var(--eb-bg-light);
  color: var(--eb-body-light);
  font-family: var(--font-sans);
  line-height: 1.6;
}

html.dark, html.dark body {
  background-color: var(--eb-bg-dark);
  color: var(--eb-body-dark);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--eb-navy);
  font-weight: 700;
}

html.dark h1, html.dark h2, html.dark h3, html.dark h4, html.dark h5, html.dark h6 {
  color: #F8FAFC;
}

/* Card layout components */
.eb-card {
  background-color: #FFFFFF;
  border: 1px solid var(--eb-border-light);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  overflow: hidden;
}

.eb-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -3px rgba(15, 28, 63, 0.06), 0 4px 6px -2px rgba(15, 28, 63, 0.03);
  border-color: rgba(185, 28, 44, 0.35); /* soft crimson outline on hover */
}

html.dark .eb-card {
  background-color: #111827; /* near black dashboard cards */
  border-color: var(--eb-border-dark);
}

html.dark .eb-card:hover {
  border-color: rgba(185, 28, 44, 0.5);
  box-shadow: 0 12px 20px -3px rgba(0, 0, 0, 0.3);
}

/* Buttons */
.eb-btn-primary {
  background-color: var(--eb-crimson);
  color: #FFFFFF !important;
  font-family: var(--font-sans);
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.eb-btn-primary:hover {
  background-color: #991B1B;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(185, 28, 44, 0.2);
}

.eb-btn-primary:active {
  transform: translateY(0);
}

.eb-btn-secondary {
  background-color: transparent;
  border: 1px solid var(--eb-border-light);
  color: var(--eb-navy) !important;
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  text-decoration: none;
}

html.dark .eb-btn-secondary {
  border-color: var(--eb-border-dark);
  color: var(--eb-body-dark) !important;
}

.eb-btn-secondary:hover {
  background-color: rgba(15, 28, 63, 0.03);
  border-color: var(--eb-navy);
  color: var(--eb-navy) !important;
}

html.dark .eb-btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.03);
  border-color: #F8FAFC;
  color: #F8FAFC !important;
}

/* Breadcrumbs */
.eb-breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.825rem;
  color: #64748b;
  margin-bottom: 1.25rem;
  font-weight: 500;
}

.eb-breadcrumbs a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.15s ease;
}

.eb-breadcrumbs a:hover {
  color: var(--eb-crimson);
}

html.dark .eb-breadcrumbs a:hover {
  color: #F8FAFC;
}

.eb-breadcrumbs .separator {
  color: #94a3b8;
  font-size: 0.75rem;
}

/* Soft-Gate Modal overlays */
.eb-modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 28, 63, 0.55);
  backdrop-filter: blur(5px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.eb-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.eb-modal {
  background-color: #FFFFFF;
  border-radius: 16px;
  width: 90%;
  max-width: 440px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  border: 1px solid var(--eb-border-light);
  transform: translateY(16px);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
  padding: 1.75rem;
  text-align: center;
}

.eb-modal-overlay.active .eb-modal {
  transform: translateY(0);
}

html.dark .eb-modal {
  background-color: #111827;
  border-color: var(--eb-border-dark);
}

/* Navigation Layout */
.eb-nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-family: var(--font-serif);
  color: var(--eb-navy);
  font-size: 1.25rem;
  text-decoration: none;
}

html.dark .eb-nav-logo {
  color: #FFFFFF;
}

/* Badges */
.eb-badge-dot {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  text-transform: capitalize;
}

.eb-badge-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.eb-badge-admin {
  background-color: rgba(185, 28, 44, 0.1);
  color: var(--eb-crimson);
}
.eb-badge-admin::before {
  background-color: var(--eb-crimson);
}

.eb-badge-teacher {
  background-color: rgba(37, 99, 235, 0.1);
  color: #2563eb;
}
.eb-badge-teacher::before {
  background-color: #2563eb;
}

.eb-badge-student {
  background-color: rgba(5, 150, 105, 0.1);
  color: #059669;
}
.eb-badge-student::before {
  background-color: #059669;
}

/* Standard Editorial Tables */
.eb-table-container {
  overflow-x: auto;
  border: 1px solid var(--eb-border-light);
  border-radius: 8px;
  background-color: #FFFFFF;
  margin: 1rem 0;
}

html.dark .eb-table-container {
  border-color: var(--eb-border-dark);
  background-color: #111827;
}

.eb-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.eb-table th {
  background-color: #F8FAFC;
  color: var(--eb-navy);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--eb-border-light);
  font-family: var(--font-sans);
}

html.dark .eb-table th {
  background-color: #1F2937;
  color: #F8FAFC;
  border-bottom-color: var(--eb-border-dark);
}

.eb-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--eb-border-light);
  color: var(--eb-body-light);
}

html.dark .eb-table td {
  border-bottom-color: var(--eb-border-dark);
  color: var(--eb-body-dark);
}

.eb-table tr:last-child td {
  border-bottom: none;
}

.eb-table tr:hover td {
  background-color: rgba(15, 28, 63, 0.02);
}

html.dark .eb-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Two-column admin layouts */
.eb-admin-container {
  display: flex;
  min-height: 100vh;
}

.eb-admin-sidebar {
  width: 260px;
  background-color: var(--eb-navy);
  color: #FFFFFF;
  flex-shrink: 0;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.eb-admin-main {
  flex-grow: 1;
  background-color: var(--eb-bg-light);
  padding: 2rem;
  overflow-y: auto;
}

html.dark .eb-admin-main {
  background-color: var(--eb-bg-dark);
}

/* ─────────────────────────────────────────────────────────────────
   Related Articles — shared across all blog articles
   ───────────────────────────────────────────────────────────────── */
.related-articles {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 0;
  border-top: 1px solid var(--eb-border-light);
}

html.dark .related-articles {
  border-top-color: var(--eb-border-dark);
}

.related-articles h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--eb-navy);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

html.dark .related-articles h2 {
  color: #F8FAFC;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (max-width: 640px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

.related-card {
  display: block;
  padding: 18px 20px;
  border-radius: 12px;
  background: #FFFFFF;
  border: 1px solid var(--eb-border-light);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

html.dark .related-card {
  background: #111827;
  border-color: var(--eb-border-dark);
}

.related-card:hover {
  transform: translateY(-2px);
  border-color: rgba(185, 28, 44, 0.4);
  box-shadow: 0 8px 16px -4px rgba(15, 28, 63, 0.08);
}

html.dark .related-card:hover {
  border-color: rgba(185, 28, 44, 0.5);
  box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.3);
}

.related-card-title {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--eb-navy);
  line-height: 1.5;
}

html.dark .related-card-title {
  color: #CBD5E1;
}

.related-card:hover .related-card-title {
  color: var(--eb-crimson);
}