/* ==========================================================================
   Layout: Navbar, Container, Grid, Footer, Responsive
   BoostAODE vs AODE Web App
   ========================================================================== */

/* --------------------------------------------------------------------------
   Navbar
   -------------------------------------------------------------------------- */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  min-height: 56px;
}

/* Logo */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
  color: var(--text-primary);
  font-weight: 700;
  font-size: var(--font-size-lg);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar-logo:hover {
  color: var(--accent-primary);
}

.navbar-logo svg,
.navbar-logo img {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.navbar-logo span {
  white-space: nowrap;
}

/* Nav links */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.nav-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

.nav-link.active {
  color: var(--accent-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: var(--spacing-md);
  right: var(--spacing-md);
  height: 2px;
  background-color: var(--accent-primary);
  border-radius: var(--radius-full);
}

/* Theme toggle */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Sun icon hidden by default (dark mode), shown in light mode */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

/* --------------------------------------------------------------------------
   Language Toggle
   -------------------------------------------------------------------------- */

.lang-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-left: var(--spacing-xs);
}

.btn-lang-opt {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all var(--transition-fast);
}

.btn-lang-opt::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: 6px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 2px;
}

/* Spanish flag */
.btn-lang-opt[data-lang="es"]::before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 750 500"><rect width="750" height="500" fill="%23c60b1e"/><rect width="750" height="250" y="125" fill="%23ffc400"/></svg>');
}

/* UK flag */
.btn-lang-opt[data-lang="en"]::before {
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 30"><path d="M0,0 v30 h60 v-30 z" fill="%23012169"/><path d="M0,0 L60,30 M60,0 L0,30" stroke="%23fff" stroke-width="6"/><path d="M0,0 L60,30 M60,0 L0,30" stroke="%23C8102E" stroke-width="4"/><path d="M30,0 v30 M0,15 h60" stroke="%23fff" stroke-width="10"/><path d="M30,0 v30 M0,15 h60" stroke="%23C8102E" stroke-width="6"/></svg>');
}

.btn-lang-opt.active {
  background: var(--accent-primary);
  color: white;
}

.btn-lang-opt:hover:not(.active) {
  background: var(--bg-hover);
  color: var(--accent-primary);
}

.lang-divider {
  width: 1px;
  height: 12px;
  background-color: var(--border-color);
  margin: 0 2px;
}

/* --------------------------------------------------------------------------
   Container
   -------------------------------------------------------------------------- */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-lg);
}

.container-narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-lg);
}

.container-wide {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   Section
   -------------------------------------------------------------------------- */

.section {
  margin-bottom: var(--spacing-2xl);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

/* --------------------------------------------------------------------------
   Grid Utilities
   -------------------------------------------------------------------------- */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

/* --------------------------------------------------------------------------
   Flex Utilities
   -------------------------------------------------------------------------- */

.flex-row {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

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

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-1 {
  flex: 1;
}

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

/* Gap utilities */
.gap-xs  { gap: var(--spacing-xs); }
.gap-sm  { gap: var(--spacing-sm); }
.gap-md  { gap: var(--spacing-md); }
.gap-lg  { gap: var(--spacing-lg); }
.gap-xl  { gap: var(--spacing-xl); }
.gap-2xl { gap: var(--spacing-2xl); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.footer a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Page Header / Hero
   -------------------------------------------------------------------------- */

.page-header {
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  text-align: center;
}

.page-header h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

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

/* --------------------------------------------------------------------------
   Two-column Layout (sidebar + main)
   -------------------------------------------------------------------------- */

.layout-sidebar {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 72px;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Mobile: < 768px */
@media (max-width: 767px) {
  .navbar-inner {
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-sm);
  }

  .navbar-logo {
    font-size: var(--font-size-base);
  }

  .navbar-logo svg,
  .navbar-logo img {
    width: 24px;
    height: 24px;
  }

  .navbar-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
    -webkit-overflow-scrolling: touch;
  }

  .nav-link {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .nav-link.active::after {
    left: var(--spacing-sm);
    right: var(--spacing-sm);
  }

  .container,
  .container-narrow,
  .container-wide {
    padding: var(--spacing-md) var(--spacing-md);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .page-header {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }

  .page-header h1 {
    font-size: var(--font-size-2xl);
  }

  .page-header p {
    font-size: var(--font-size-base);
  }

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

  .sidebar {
    position: static;
  }
}

/* Tablet: 768px - 1024px */
@media (min-width: 768px) and (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .layout-sidebar {
    grid-template-columns: 280px 1fr;
  }

  .container,
  .container-narrow,
  .container-wide {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

/* Desktop: > 1024px — default styles apply */

@media (min-width: 1025px) {
  .layout-sidebar {
    grid-template-columns: 320px 1fr;
  }
}

/* Large screens */
@media (min-width: 1600px) {
  .container-wide {
    max-width: 1800px;
  }
}