/* ==========================================
   HABIT PRO - MOBILE RESPONSIVE & UI MICRO-OPTIMIZATIONS
   Instagram / YouTube Hybrid Native Mobile Design System
   ========================================== */

/* Desktop Fixed Sidebar Navigation */
.app-sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .app-sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(14, 20, 36, 0.9);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: 32px 24px;
    z-index: 50;
  }
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 800;
  font-size: 20px;
  box-shadow: 0 4px 16px var(--accent-primary-glow);
}

.brand-title {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, #FFFFFF 0%, #94A3B8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border-radius: var(--radius-inner);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: all var(--transition-normal);
}

.nav-item:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.nav-item.active {
  color: #FFFFFF;
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.18) 0%, rgba(99, 102, 241, 0.05) 100%);
  border-left: 3px solid var(--accent-primary);
}

.nav-icon {
  width: 22px;
  height: 22px;
  stroke-width: 2px;
}

/* Sticky Bottom Navigation (YouTube/Instagram Style) */
.bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-around;
  position: fixed !important;
  bottom: 0 !important;
  left: 0 !important;
  right: 0 !important;
  z-index: 1000 !important;
  height: calc(var(--bottom-nav-height) + env(safe-area-inset-bottom, 0px));
  background: rgba(9, 13, 22, 0.85) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
  border-top: 1px solid rgba(255, 255, 255, 0.08) !important;
  padding-bottom: env(safe-area-inset-bottom, 0px) !important;
}

@media (min-width: 1024px) {
  .bottom-nav {
    display: none;
  }
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 11px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 16px;
  transition: all var(--transition-normal);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.bottom-nav-item.active {
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.bottom-nav-item.active .bottom-nav-icon {
  stroke: var(--accent-primary);
  filter: drop-shadow(0 2px 8px var(--accent-primary-glow));
}

.bottom-nav-icon {
  width: 24px;
  height: 24px;
}

/* Content Spacing for Mobile Bottom Bar */
@media (max-width: 1023px) {
  .content-wrapper {
    padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px)) !important;
  }

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

  .header-bar {
    padding: 16px 20px;
  }

  h1 {
    font-size: 1.75rem !important;
  }
}

/* Horizontal Scrollable Category Filter Pills */
.cat-filter-container,
div[style*="overflow-x: auto"] {
  display: flex !important;
  flex-wrap: nowrap !important;
  overflow-x: auto !important;
  touch-action: pan-x !important;
  -webkit-overflow-scrolling: touch !important;
  scrollbar-width: none !important;
  -ms-overflow-style: none !important;
  padding-right: 1rem !important;
}
div[style*="overflow-x: auto"]::-webkit-scrollbar {
  display: none !important;
}

.cat-filter-btn {
  min-height: 38px !important;
  white-space: nowrap !important;
  flex-shrink: 0 !important;
  touch-action: manipulation !important;
}

/* Mobile Bottom Sheet Modal Pattern (< 640px) */
@media (max-width: 639px) {
  .modal-overlay {
    align-items: flex-end;
    padding: 0;
    z-index: 2000 !important;
  }

  .modal-card {
    max-width: 100% !important;
    width: 100% !important;
    border-bottom-left-radius: 0 !important;
    border-bottom-right-radius: 0 !important;
    border-top-left-radius: 28px !important;
    border-top-right-radius: 28px !important;
    max-height: 85vh;
    overflow-y: auto;
    animation: slideUpBottomSheet 300ms var(--ease-spring);
  }

  .modal-card .card-inner {
    padding: 24px 20px calc(36px + env(safe-area-inset-bottom, 0px)) 20px !important;
  }

  @keyframes slideUpBottomSheet {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
  }

  .btn {
    min-height: 44px; /* Touch target accessibility rule */
  }

  /* Responsive Calendar Grid (< 640px) */
  .calendar-days-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr)) !important;
    gap: 4px !important;
    margin-bottom: 16px !important;
  }

  .calendar-day-box {
    border-radius: 8px !important;
    padding: 2px !important;
    aspect-ratio: 1 !important;
  }

  .day-num {
    font-size: 11px !important;
  }

  .month-label {
    font-size: 8px !important;
    line-height: 1 !important;
  }

  .note-indicator-dot {
    top: 2px !important;
    right: 2px !important;
    font-size: 8px !important;
  }
}

/* Dedicated Mobile Micro-Optimizations (< 480px) */
@media (max-width: 480px) {
  /* 1. Compact Header */
  .header-bar {
    padding: 12px 14px !important;
    gap: 8px !important;
  }

  .user-profile-widget {
    gap: 8px !important;
  }

  .user-profile-widget div span {
    display: none !important; /* Hide secondary subtitle to save space */
  }

  .header-actions {
    gap: 6px !important;
  }

  .header-actions a[title="Go to Landing Page"] {
    display: none !important; /* Hide non-critical home link in header on mobile */
  }

  .streak-pill {
    padding: 4px 8px !important;
    font-size: 11px !important;
  }

  /* 2. Adaptive Metric Cards (2x2 Grid) */
  .grid-stats {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }

  .grid-stats .card-inner {
    padding: 0.75rem 0.85rem !important;
    border-radius: var(--radius-inner) !important;
    border: 1px solid rgba(255, 255, 255, 0.05) !important;
  }

  .grid-stats .card-inner span {
    font-size: 0.7rem !important;
    letter-spacing: 0.04em !important;
    text-transform: uppercase !important;
  }

  .grid-stats .card-inner h2 {
    font-size: 1.35rem !important;
    margin-top: 4px !important;
    font-weight: 700 !important;
  }

  /* 3. Optimized Habit Card Layout */
  .grid-habits h3 {
    font-size: 1.1rem !important;
    line-height: 1.3 !important;
  }

  .grid-habits a[title*="Daily Reflection Notes"] {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    padding: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    flex-shrink: 0 !important;
    border-radius: 12px !important;
  }
}

/* Grid Layout Breakpoints */
.grid-stats {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 16px;
}

@media (min-width: 481px) and (max-width: 1023px) {
  .grid-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-stats { grid-template-columns: repeat(4, 1fr); }
}

.grid-habits {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 20px;
}

@media (min-width: 768px) {
  .grid-habits { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1280px) {
  .grid-habits { grid-template-columns: repeat(3, 1fr); }
}

.grid-analytics {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 24px;
}

@media (min-width: 1024px) {
  .grid-analytics { grid-template-columns: 2fr 1fr; }
}