/* Constellation Design System - Layout */
/* US-1.3: Navigation Shell */

/* === APP CONTAINER === */
#app {
  min-height: 100vh;
  background-color: var(--deep-void);
  display: flex;
  flex-direction: column;
}

/* === NAVIGATION SIDEBAR (Desktop) === */
.nav-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 200px;
  height: 100vh;
  background-color: var(--panel-grey);
  border-right: var(--border-standard);
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.nav-header {
  padding: var(--space-4);
  border-bottom: var(--border-standard);
}

.nav-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--cyber-cyan);
  margin-bottom: var(--space-1);
}

.nav-subtitle {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--dimmed-grey);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-items {
  flex: 1;
  padding: var(--space-2) 0;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--system-white);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.nav-link:hover {
  background-color: rgba(102, 252, 241, 0.1);
  color: var(--cyber-cyan);
}

.nav-link.active {
  color: var(--cyber-cyan);
  background-color: rgba(102, 252, 241, 0.1);
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background-color: var(--cyber-cyan);
}

.nav-link.active::after {
  content: ">";
  position: absolute;
  right: var(--space-4);
  color: var(--cyber-cyan);
}

.nav-icon {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dimmed-grey);
}

.nav-link:hover .nav-icon,
.nav-link.active .nav-icon {
  color: var(--cyber-cyan);
}

.nav-footer {
  padding: var(--space-4);
  border-top: var(--border-standard);
}

.nav-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  color: var(--dimmed-grey);
}

.nav-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--ready-green);
  box-shadow: 0 0 6px var(--ready-green);
}

/* === MAIN CONTENT AREA === */
.main-content {
  flex: 1;
  margin-left: 200px;
  padding: var(--space-6);
  min-height: 100vh;
}

.page-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-standard);
}

.page-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--cyber-cyan);
}

.page-subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dimmed-grey);
  margin-top: var(--space-1);
}

/* === MOBILE NAVIGATION === */
.nav-mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--panel-grey);
  border-bottom: var(--border-standard);
  z-index: 100;
}

.nav-mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
}

.nav-mobile-title {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--cyber-cyan);
}

.nav-mobile-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: var(--border-standard);
  color: var(--system-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  cursor: pointer;
}

.nav-mobile-toggle:hover {
  border-color: var(--cyber-cyan);
  color: var(--cyber-cyan);
}

.nav-mobile-menu {
  display: none;
  border-top: var(--border-standard);
}

.nav-mobile-menu.open {
  display: block;
}

.nav-mobile-items {
  list-style: none;
  padding: var(--space-2) 0;
}

.nav-mobile-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--system-white);
  text-decoration: none;
  border-left: 3px solid transparent;
}

.nav-mobile-link:hover {
  background-color: rgba(102, 252, 241, 0.1);
  color: var(--cyber-cyan);
}

.nav-mobile-link.active {
  color: var(--cyber-cyan);
  border-left-color: var(--cyber-cyan);
  background-color: rgba(102, 252, 241, 0.1);
}

/* === RESPONSIVE: Mobile (<=768px) === */
@media (max-width: 768px) {
  .nav-sidebar {
    display: none;
  }

  .nav-mobile {
    display: block;
  }

  .main-content {
    margin-left: 0;
    padding-top: calc(60px + var(--space-4)); /* Account for fixed mobile nav */
  }
}

/* === PAGE SECTIONS === */
.section {
  margin-bottom: var(--space-6);
}

.section-header {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--dimmed-grey);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-standard);
}

/* === PLACEHOLDER STATES === */
.placeholder-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  text-align: center;
}

.placeholder-icon {
  font-size: 3rem;
  color: var(--dimmed-grey);
  margin-bottom: var(--space-4);
}

.placeholder-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--dimmed-grey);
  text-transform: uppercase;
}

/* === SCROLLBAR STYLING === */
body {
  scrollbar-width: thin;
  scrollbar-color: var(--dimmed-grey) var(--panel-grey);
}

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

body::-webkit-scrollbar-track {
  background: var(--panel-grey);
}

body::-webkit-scrollbar-thumb {
  background-color: var(--dimmed-grey);
  border-radius: 0;
}