/**
 * AECS4U Layout Styles
 * Navbar, Sidebar, Main Content, Footer
 */

/* ============================================================
   ACCESSIBILITY
   ============================================================ */

/* Skip to content link */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary-600);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  z-index: calc(var(--z-fixed) + 10);
  transition: top var(--duration-fast);
  text-decoration: none;
}

.skip-to-content:focus {
  top: 1rem;
  outline: 2px solid var(--color-primary-300);
  outline-offset: 2px;
}

/* Focus visible styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Remove focus ring for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* ============================================================
   BASE STYLES
   ============================================================ */

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   NAVBAR
   ============================================================ */

.navbar-main {
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  padding: 0 1rem;
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
}

[data-bs-theme="dark"] .navbar-main {
  background-color: rgba(15, 23, 42, 0.95);
  border-bottom-color: var(--color-border-light);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.navbar-brand img {
  height: 32px;
  width: auto;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-600);
  margin: 0;
}

/* ============================================================
   SIDEBAR
   ============================================================ */

.sidebar {
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  position: fixed;
  top: var(--header-height);
  left: 0;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-right: 1px solid var(--color-border-light);
  transition: transform var(--duration-slow) var(--ease-in-out);
  z-index: var(--z-sticky);
  overflow-y: auto;
}

[data-bs-theme="dark"] .sidebar {
  background-color: rgba(30, 41, 59, 0.95);
  border-right-color: var(--color-border-light);
}

.sidebar-nav {
  padding: 1rem 0;
}

.nav-item {
  margin: 0.25rem 1rem;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}

.nav-link:hover {
  background-color: var(--color-primary-50);
  color: var(--color-primary-600);
}

[data-bs-theme="dark"] .nav-link:hover {
  background-color: rgba(59, 130, 246, 0.1);
}

.nav-link.active {
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-secondary-500));
  color: white;
}

.nav-link i {
  width: 1.25rem;
  margin-right: 0.75rem;
  text-align: center;
}

/* Sidebar Toggle */
.sidebar-toggle {
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.sidebar-toggle:hover {
  color: var(--color-primary-600);
  background-color: var(--color-bg-tertiary);
}

/* Sidebar Groups */
.sidebar-group {
  margin: 0.5rem 0;
}

.sidebar-group-header {
  background: none;
  border: none;
  width: calc(100% - 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: var(--transition-base);
  border-radius: var(--radius-md);
  margin: 0 1rem;
}

.sidebar-group-header:hover {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--color-primary-600);
}

.sidebar-group-header:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.sidebar-group-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-group-header .toggle-icon {
  font-size: 0.75rem;
  transition: transform var(--duration-slow) var(--ease-in-out);
}

.sidebar-group.collapsed .sidebar-group-header .toggle-icon {
  transform: rotate(-90deg);
}

.sidebar-group-content {
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-in-out),
              opacity var(--duration-slow) var(--ease-in-out);
  opacity: 1;
}

.sidebar-group.collapsed .sidebar-group-content {
  max-height: 0 !important;
  opacity: 0;
}

.nav-divider {
  height: 1px;
  background-color: var(--color-border-light);
  margin: 1rem 1.5rem;
  opacity: 0.5;
}

/* ============================================================
   SIDEBAR STATES
   ============================================================ */

.sidebar-visible .sidebar {
  transform: translateX(0);
}

.sidebar-visible .main-content,
.sidebar-visible .site-footer {
  margin-left: var(--sidebar-width);
}

.sidebar-hidden .sidebar {
  transform: translateX(-100%);
}

.sidebar-hidden .main-content,
.sidebar-hidden .site-footer {
  margin-left: 0;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */

.main-content {
  margin-left: var(--sidebar-width);
  margin-top: var(--header-height);
  padding: 2rem;
  transition: margin-left var(--duration-slow) var(--ease-in-out);
  flex: 1;
}

/* ============================================================
   FOOTER
   Mirrors the navbar-main style: translucent background with
   backdrop-filter blur, theme-aware via design-token variables.
   ============================================================ */

.site-footer {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
  padding: 2rem 0 1rem;
  margin-left: var(--sidebar-width);
  margin-top: auto;
  transition: margin-left var(--duration-slow) var(--ease-in-out);
}

[data-bs-theme="dark"] .site-footer {
  background-color: rgba(15, 23, 42, 0.95);
  border-top-color: var(--color-border-light);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.footer-section h6.footer-title {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--text-sm);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.footer-brand .footer-logo span {
  font-weight: var(--font-weight-bold);
  font-size: 1.25rem;
  color: var(--color-primary-600);
}

.footer-tagline {
  font-size: var(--text-sm);
  line-height: 1.5;
  margin: 0;
  color: var(--color-text-tertiary);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: var(--color-primary-600);
}

.footer-links a i {
  font-size: 0.8rem;
  width: 16px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
}

.copyright {
  font-size: 0.85rem;
  margin: 0;
  color: var(--color-text-tertiary);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  transition: color var(--duration-fast);
}

.footer-social a:hover {
  color: var(--color-primary-600);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Large tablets and small desktops (992px - 1199px) */
@media (max-width: 1199.98px) {
  :root {
    --sidebar-width: 260px;
  }

  .main-content {
    padding: 1.5rem;
  }
}

/* Tablets (768px - 991px) */
@media (max-width: 991.98px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar-visible .sidebar {
    transform: translateX(0);
  }

  .main-content,
  .site-footer {
    margin-left: 0 !important;
  }

  .main-content {
    padding: 1.25rem;
  }

  /* Mobile overlay */
  .sidebar-visible::before {
    content: "";
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100% - var(--header-height));
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-sticky) - 1);
    transition: opacity var(--duration-slow);
  }

  .sidebar-hidden::before {
    opacity: 0;
    pointer-events: none;
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }

  /* Navbar adjustments for tablets */
  .navbar-brand .logo-text {
    font-size: 1.1rem;
  }
}

/* Small tablets and large phones (576px - 767px) */
@media (max-width: 767.98px) {
  :root {
    --header-height: 60px;
  }

  .main-content {
    padding: 1rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  /* Hide logo text on small screens, show only icon */
  .navbar-brand .logo-text {
    font-size: 1rem;
  }

  .sidebar {
    width: 280px;
  }
}

/* Mobile phones (< 576px) */
@media (max-width: 575.98px) {
  .main-content {
    padding: 0.75rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .sidebar {
    width: 100%;
  }

  /* Full-width sidebar on mobile */
  .sidebar-visible .sidebar {
    width: 100%;
  }
}

/* ============================================================
   THEME TOGGLE
   ============================================================ */

.theme-toggle {
  border: none;
  background: none;
  color: var(--color-text-secondary);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  transition: var(--transition-base);
  cursor: pointer;
}

.theme-toggle:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-primary-600);
}

.theme-toggle:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* ============================================================
   DROPDOWN STYLES
   ============================================================ */

.dropdown-menu {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

[data-bs-theme="dark"] .dropdown-menu {
  background-color: var(--color-bg-secondary);
}

.dropdown-item {
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-primary);
  transition: var(--transition-base);
}

.dropdown-item:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-primary-600);
}

.dropdown-item i {
  width: 1rem;
  text-align: center;
}

/* ============================================================
   THEME TRANSITION
   ============================================================ */

* {
  transition: background-color var(--duration-slow),
              color var(--duration-slow),
              border-color var(--duration-slow);
}

/* ============================================================
   SCROLLBAR
   ============================================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-medium);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-dark);
}

[data-bs-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-500);
}