/**
 * AI Study & Task Planner - Layout Architecture
 * Desktop sidebar + sticky header + responsive main container + mobile bottom nav
 */

.app-root {
  display: flex;
  height: 100vh;
  width: 100vw;
  background-color: var(--color-bg-base);
  overflow: hidden;
}

/* Sidebar Navigation (Desktop - Fixed & Non-moving) */
.app-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  position: relative;
  top: 0;
  background-color: var(--color-bg-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform var(--transition-normal), width var(--transition-normal);
}

.sidebar-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-main);
}
.brand-title .logo-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent-emerald);
  box-shadow: var(--shadow-glow-emerald);
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.nav-section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  padding: 0 var(--space-sm) var(--space-2xs);
  font-family: var(--font-mono);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-item-btn:hover {
  background-color: var(--color-bg-surface-hover);
  color: var(--color-text-main);
}

.nav-item-btn.active {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  font-weight: 600;
}
.nav-item-btn.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15%;
  bottom: 15%;
  width: 3px;
  background-color: var(--color-primary);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}

.nav-item-btn .nav-badge {
  margin-left: auto;
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--color-bg-surface-elevated);
  font-family: var(--font-mono);
}

.sidebar-footer {
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-bg-surface);
}

.user-mini-card {
  display: flex;
  align-items: center;
  gap: 8px;
}
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-purple));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}
.user-info-text {
  display: flex;
  flex-direction: column;
}
.user-name {
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
}
.user-stage {
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

/* App Main Content Area (Desktop: Independently scrollable, no double scrollbars) */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
}

/* Top Navigation / App Header */
.app-header {
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: rgba(14, 21, 38, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
}

body[data-theme='light'] .app-header {
  background-color: rgba(255, 255, 255, 0.88);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.mobile-menu-toggle {
  display: none;
  padding: 6px;
  color: var(--color-text-main);
  border-radius: var(--radius-sm);
}

.header-greeting-wrap {
  display: flex;
  flex-direction: column;
}
.header-greeting {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.header-subline {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.date-controller {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--color-bg-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 4px 10px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.date-controller input[type="date"] {
  border: none;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--color-text-main);
  cursor: pointer;
}
.date-controller input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.8);
  cursor: pointer;
}
body[data-theme='light'] .date-controller input[type="date"]::-webkit-calendar-picker-indicator {
  filter: none;
}

/* Page View Content Container */
.app-content {
  flex: 1;
  padding: 24px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

/* System Alerts Container */
.system-alerts-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.system-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg-surface);
  animation: fadeIn 0.3s ease;
}

.system-banner-info {
  border-color: rgba(59, 130, 246, 0.4);
  background: rgba(59, 130, 246, 0.08);
}
.system-banner-warning {
  border-color: rgba(245, 158, 11, 0.4);
  background: rgba(245, 158, 11, 0.08);
}

/* Mobile Bottom Navigation */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--mobile-bottom-nav-height);
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  z-index: 100;
  padding: 0 var(--space-xs);
  justify-content: space-around;
  align-items: center;
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 0.68rem;
  color: var(--color-text-muted);
  flex: 1;
  height: 100%;
}
.mobile-nav-btn.active {
  color: var(--color-primary);
  font-weight: 600;
}
.mobile-nav-btn svg {
  width: 20px;
  height: 20px;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .app-sidebar {
    width: var(--sidebar-collapsed-width);
    min-width: var(--sidebar-collapsed-width);
  }
  .app-sidebar .brand-title span,
  .app-sidebar .brand-subtitle,
  .app-sidebar .nav-section-label,
  .app-sidebar .nav-text,
  .app-sidebar .user-info-text,
  .app-sidebar .nav-badge {
    display: none;
  }
  .app-sidebar .nav-item-btn {
    justify-content: center;
    padding: 10px;
  }
}

@media (max-width: 768px) {
  .app-root {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }
  .app-main {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }
  .app-sidebar {
    display: none;
  }
  .app-header {
    padding: 0 12px !important;
    gap: 8px !important;
    max-width: 100vw;
    box-sizing: border-box;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background-color: var(--color-bg-base) !important;
  }
  #header-canonical-date {
    font-size: 0.8rem !important;
    max-width: 145px;
  }
  #header-canonical-date span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  #sync-status-text {
    display: none !important;
  }
  #header-sync-status {
    padding: 4px 6px !important;
  }
  #theme-toggle-label {
    display: none !important;
  }
  #btn-theme-toggle {
    padding: 5px 8px !important;
    min-width: 32px;
    justify-content: center;
  }
  #btn-header-settings {
    display: none !important;
  }
  #btn-global-add {
    padding: 6px 10px !important;
    font-size: 0.78rem !important;
  }
  #mobile-brand-title {
    display: flex !important;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .mobile-bottom-nav {
    display: flex;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    height: calc(var(--mobile-bottom-nav-height) + env(safe-area-inset-bottom, 0px));
    box-sizing: border-box;
  }
  .app-content {
    padding: 14px;
    padding-bottom: calc(var(--mobile-bottom-nav-height) + env(safe-area-inset-bottom, 0px) + 28px) !important;
    box-sizing: border-box;
    width: 100%;
  }
  .header-subline {
    display: none;
  }
  .header-right .btn-label {
    display: none;
  }
}