/**
 * TransLogix Layout
 * Site header, sidebar, main content, grid
 */

/* Site header (top navbar for all pages) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header .logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.site-header .logo:hover {
  color: var(--color-primary);
}

.site-header .logo i {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav a {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-subtle);
}

/* Burger button (mobile) */
.burger-btn {
  display: none;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

@media (max-width: 768px) {
  .burger-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav:not(.open) {
    display: none;
  }

  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
  }
}

@media (min-width: 769px) {
  .burger-btn {
    display: none;
  }
}

/* App layout with sidebar */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar .logo {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}

.sidebar .logo a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.sidebar .logo a:hover {
  color: var(--color-primary);
}

.sidebar .logo i {
  color: var(--color-primary);
}

.nav-menu {
  flex: 1;
  padding: 0 var(--space-4);
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-1);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
}

.nav-item:hover {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}

.nav-item.active {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.nav-item.active i {
  color: var(--color-primary);
}

.nav-item i {
  width: 22px;
  text-align: center;
  color: var(--color-text-muted);
}

.user-info {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
}

/* Main content area */
.main-content {
  flex: 1;
  margin-left: 260px;
  padding: var(--space-6);
  min-height: 100vh;
}

/* Top bar (for admin) */
.top-bar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* Grid */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-6);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-5);
}

.form-row {
  display: flex;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

/* Mobile: sidebar hidden */
@media (max-width: 1023px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }
}

@media (max-width: 768px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }

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