/* ----------------------------------------------------
   DESIGN SYSTEM & VARIABLES (DARK MODE - DEFAULT)
   ---------------------------------------------------- */
:root {
  /* Font Family */
  --font-main: 'Plus Jakarta Sans', 'Sarabun', sans-serif;

  /* Theme Color Palette (HSL-based for rich visuals and opacity control) */
  --bg-base: hsl(222, 47%, 6%);
  --bg-card: rgba(17, 24, 39, 0.55);
  --bg-card-hover: rgba(17, 24, 39, 0.75);
  --bg-sidebar: rgba(15, 23, 42, 0.65);
  --border-glass: rgba(255, 255, 255, 0.07);
  --border-glass-focus: rgba(99, 102, 241, 0.4);

  /* Primary Accent: Premium Indigo/Violet */
  --primary: hsl(243, 75%, 65%);
  --primary-hover: hsl(243, 75%, 58%);
  --primary-glow: rgba(99, 102, 241, 0.35);

  /* Status Colors */
  --color-assigned: hsl(195, 85%, 50%); /* Neon Cyan */
  --color-assigned-glow: rgba(6, 182, 212, 0.25);
  
  --color-overdue: hsl(355, 85%, 55%); /* Coral Red */
  --color-overdue-glow: rgba(239, 68, 68, 0.25);
  
  --color-completed: hsl(145, 75%, 45%); /* Emerald Green */
  --color-completed-glow: rgba(16, 185, 129, 0.25);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, hsl(243, 75%, 65%) 0%, hsl(263, 80%, 60%) 100%);
  --grad-assigned: linear-gradient(135deg, hsl(190, 90%, 50%) 0%, hsl(210, 85%, 50%) 100%);
  --grad-overdue: linear-gradient(135deg, hsl(355, 85%, 60%) 0%, hsl(15, 85%, 55%) 100%);
  --grad-completed: linear-gradient(135deg, hsl(140, 75%, 45%) 0%, hsl(160, 80%, 40%) 100%);
  --grad-dark: linear-gradient(180deg, hsl(222, 47%, 9%) 0%, hsl(222, 47%, 4%) 100%);

  /* Text Colors */
  --text-main: hsl(210, 40%, 96%);
  --text-muted: hsl(215, 20%, 65%);
  --text-dim: hsl(215, 15%, 45%);

  /* Blur details */
  --blur-glass: blur(14px);
  --blur-modal: blur(15px);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 30px;

  /* Box Shadows */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 20px 0 rgba(99, 102, 241, 0.25);

  /* Animation Timings */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ----------------------------------------------------
   LIGHT MODE OVERRIDES
   ---------------------------------------------------- */
body.light-theme {
  --bg-base: hsl(210, 40%, 95%);
  --bg-card: rgba(255, 255, 255, 0.65);
  --bg-card-hover: rgba(255, 255, 255, 0.85);
  --bg-sidebar: rgba(241, 245, 249, 0.75);
  --border-glass: rgba(15, 23, 42, 0.08);
  --border-glass-focus: rgba(79, 70, 229, 0.5);
  
  --primary: hsl(243, 75%, 60%);
  --primary-hover: hsl(243, 75%, 52%);
  --primary-glow: rgba(79, 70, 229, 0.15);

  --text-main: hsl(222, 47%, 12%);
  --text-muted: hsl(215, 20%, 35%);
  --text-dim: hsl(215, 12%, 52%);

  --grad-dark: linear-gradient(180deg, hsl(210, 40%, 97%) 0%, hsl(210, 40%, 91%) 100%);
  
  --color-assigned: hsl(200, 95%, 40%);
  --color-overdue: hsl(355, 80%, 50%);
  --color-completed: hsl(145, 80%, 36%);

  --shadow-md: 0 10px 20px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 30px -5px rgba(15, 23, 42, 0.09), 0 10px 15px -5px rgba(15, 23, 42, 0.05);
}

/* ----------------------------------------------------
   BASE RESET & UTILITIES
   ---------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-base);
  background-image: var(--grad-dark);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  transition: background var(--transition-normal), color var(--transition-normal);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.08);
}
::-webkit-scrollbar-thumb {
  background: rgba(120, 120, 120, 0.25);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(120, 120, 120, 0.4);
}

/* Glassmorphism template */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-lg);
}

body.light-theme .glass-panel:hover {
  border-color: rgba(0, 0, 0, 0.12);
}

.hidden {
  display: none !important;
}

.text-success-color { color: var(--color-completed) !important; }
.text-danger-color { color: var(--color-overdue) !important; }
.text-info-color { color: var(--color-assigned) !important; }

/* ----------------------------------------------------
   LAYOUT: SIDEBAR & MAIN CONTAINER
   ---------------------------------------------------- */
.app-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  position: relative;
}

/* Sidebar Styling */
.sidebar {
  background: var(--bg-sidebar);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-right: 1px solid var(--border-glass);
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background var(--transition-normal), border var(--transition-normal);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 3rem;
}

.logo-icon {
  font-size: 2.2rem;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-grow: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.nav-item i {
  font-size: 1.3rem;
  transition: transform var(--transition-fast);
}

.nav-item:hover {
  color: var(--text-main);
  background: rgba(120, 120, 120, 0.08);
}

.nav-item:hover i {
  transform: translateX(3px);
}

.nav-item.active {
  color: #fff !important;
  background: var(--grad-primary);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.sidebar-footer {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Theme Switcher Style */
.theme-toggle-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(120, 120, 120, 0.06);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
}

.theme-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  transform: scale(1.08) rotate(15deg);
  border-color: var(--primary);
}

.theme-toggle-btn:active {
  transform: scale(0.95);
}

.debug-toggle-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(120, 120, 120, 0.06);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
}

.debug-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Switch Toggle CSS */
.switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(120, 120, 120, 0.3);
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(16px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Main Content Area */
.main-content {
  padding: 2.5rem 3.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* ----------------------------------------------------
   HEADER & LIVE CLOCK
   ---------------------------------------------------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 1.5rem;
}

.header-title h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.header-title .subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

.header-clock-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-sm);
}

.clock-icon-wrapper {
  background: var(--grad-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.clock-icon-wrapper i {
  font-size: 1.4rem;
  color: #fff;
}

.pulse-icon {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

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

.time-string {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-variant-numeric: tabular-nums;
  color: var(--text-main);
}

body:not(.light-theme) .time-string {
  background: linear-gradient(180deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.date-string {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ----------------------------------------------------
   STATS OVERVIEW
   ---------------------------------------------------- */
.stats-overview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.stat-card {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
}

.assigned-icon { background: var(--grad-assigned); box-shadow: 0 4px 15px var(--color-assigned-glow); }
.overdue-icon { background: var(--grad-overdue); box-shadow: 0 4px 15px var(--color-overdue-glow); }
.completed-icon { background: var(--grad-completed); box-shadow: 0 4px 15px var(--color-completed-glow); }

.stat-info h3 {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-info p {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

.stat-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 4px;
  width: 100%;
}
.assigned-bar { background: var(--color-assigned); }
.overdue-bar { background: var(--color-overdue); }
.completed-bar { background: var(--color-completed); }

/* ----------------------------------------------------
   DEBUG PANEL
   ---------------------------------------------------- */
.debug-panel {
  padding: 1.25rem 1.5rem;
  border: 1px dashed rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.03);
}

.debug-panel-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.35rem;
}

.debug-panel-header h4 {
  color: var(--color-overdue);
  font-size: 1rem;
}

.debug-badge {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-overdue);
  font-size: 0.7rem;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-weight: bold;
}

.debug-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.debug-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

/* ----------------------------------------------------
   VIEW ARCHITECTURE (SPA SWAP)
   ---------------------------------------------------- */
.content-view {
  display: none;
  animation: fadeIn var(--transition-normal) forwards;
}

.content-view.active-view {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ----------------------------------------------------
   VIEW 1: DASHBOARD (TABS, SEARCH & GRID)
   ---------------------------------------------------- */
.view-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tabs-container {
  display: flex;
  padding: 0.35rem;
}

.tab-btn {
  background: transparent;
  border: none;
  outline: none;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.tab-btn i {
  font-size: 1.1rem;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(120, 120, 120, 0.05);
}

.tab-btn.active {
  color: var(--text-main);
  background: rgba(120, 120, 120, 0.12);
  box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.05);
}

body.light-theme .tab-btn.active {
  color: var(--text-main);
  background: rgba(0, 0, 0, 0.05);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.search-container {
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  width: 380px;
  height: 48px;
}

.search-icon {
  font-size: 1.25rem;
  color: var(--text-dim);
  margin-right: 0.75rem;
}

.search-container input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.9rem;
  width: 100%;
}

.search-container input::placeholder {
  color: var(--text-dim);
}

/* Homework Task Grid */
.task-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

/* Homework Card Styling */
.task-card {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  transition: all var(--transition-normal);
  border-top-width: 4px;
}

.task-card:hover {
  transform: translateY(-5px);
}

.task-card.assigned-status { border-top-color: var(--color-assigned); }
.task-card.overdue-status { border-top-color: var(--color-overdue); }
.task-card.completed-status { border-top-color: var(--color-completed); }

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.subject-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.assigned-status .subject-badge { background: rgba(6, 182, 212, 0.12); color: var(--color-assigned); }
.overdue-status .subject-badge { background: rgba(239, 68, 68, 0.12); color: var(--color-overdue); }
.completed-status .subject-badge { background: rgba(16, 185, 129, 0.12); color: var(--color-completed); }

/* Enlarged card-date formatting as requested */
.card-date {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(120, 120, 120, 0.08);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  font-family: var(--font-main);
}

.assigned-status .card-date i { color: var(--color-assigned); }
.overdue-status .card-date i { color: var(--color-overdue); }
.completed-status .card-date i { color: var(--color-completed); }

.overdue-status .card-date {
  border-color: rgba(239, 68, 68, 0.25);
  background: rgba(239, 68, 68, 0.06);
}

.card-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  line-height: 1.4;
}

.card-body p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-line;
}

.notes-box {
  background: rgba(120, 120, 120, 0.04);
  border: 1px solid var(--border-glass);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 0.5rem;
}

.notes-box i {
  margin-top: 0.15rem;
  color: var(--primary);
  font-size: 0.95rem;
}

/* Card Actions styling */
.card-actions-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  border-top: 1px solid var(--border-glass);
  padding-top: 1.25rem;
}

.card-actions-left {
  display: flex;
  gap: 0.5rem;
}

/* Cleanup countdown footer in completed tab */
.countdown-footer {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.countdown-footer i {
  color: var(--color-completed);
}

.countdown-timer {
  color: var(--color-completed);
  font-variant-numeric: tabular-nums;
  font-weight: bold;
}

/* ----------------------------------------------------
   BUTTON STYLING (VIBRANT & TACTILE)
   ---------------------------------------------------- */
.btn {
  font-family: var(--font-main);
  outline: none;
  border: none;
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.78rem;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 6px 20px var(--primary-glow);
  opacity: 0.95;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(120, 120, 120, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(120, 120, 120, 0.15);
  color: var(--text-main);
}

body.light-theme .btn-secondary {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-main);
}
body.light-theme .btn-secondary:hover {
  background: rgba(0, 0, 0, 0.08);
}

.btn-danger {
  background: var(--grad-overdue);
  color: #fff;
  box-shadow: 0 4px 14px var(--color-overdue-glow);
}

.btn-danger:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 6px 20px var(--color-overdue-glow);
  opacity: 0.95;
}

.btn-icon-only {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.btn-complete {
  background: rgba(16, 185, 129, 0.12);
  color: var(--color-completed);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.btn-complete:hover {
  background: var(--color-completed);
  color: #fff;
  box-shadow: 0 4px 12px var(--color-completed-glow);
}

/* ----------------------------------------------------
   EMPTY STATES
   ---------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5rem 2rem;
  text-align: center;
  background: var(--bg-card);
  border: 1px dashed var(--border-glass);
  border-radius: var(--radius-lg);
  max-width: 600px;
  margin: 2rem auto;
}

.empty-icon {
  font-size: 4rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.empty-state h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  max-width: 400px;
}

/* ----------------------------------------------------
   VIEW 2: FORM STYLING (ADD / EDIT HOMEWORK)
   ---------------------------------------------------- */
.form-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem;
  width: 100%;
}

.form-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 1.5rem;
}

.form-icon-circle {
  width: 55px;
  height: 55px;
  background: var(--grad-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.pr-icon-color {
  background: var(--grad-assigned);
  box-shadow: 0 4px 15px var(--color-assigned-glow);
}

.form-title {
  font-size: 1.45rem;
  font-weight: 700;
}

.form-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.15rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.col-span-1 { grid-column: span 1; }
.col-span-2 { grid-column: span 2; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.form-group label i {
  color: var(--primary);
  font-size: 1.05rem;
}

.required {
  color: var(--color-overdue);
}

.form-group input,
.form-group textarea {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  font-size: 0.92rem;
  outline: none;
  transition: all var(--transition-fast);
}

body.light-theme .form-group input,
body.light-theme .form-group textarea {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-glass);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
  background: rgba(0, 0, 0, 0.35);
}

body.light-theme .form-group input:focus,
body.light-theme .form-group textarea:focus {
  background: #fff;
  border-color: var(--primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-dim);
}

.input-tip {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
}

/* Custom styles for datetime-local picker */
input[type="datetime-local"]::-webkit-calendar-picker-indicator {
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
}

body:not(.light-theme) input[type="datetime-local"]::-webkit-calendar-picker-indicator {
  filter: invert(1);
}

input[type="datetime-local"]::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  border-top: 1px solid var(--border-glass);
  padding-top: 2rem;
}

/* ----------------------------------------------------
   VIEW 3: PR MANAGEMENT & ADMIN AUTH LAYOUT
   ---------------------------------------------------- */
.pr-layout-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: start;
}

.pr-list-container {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  height: 600px;
}

.pr-list-container h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.pr-list-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: -1rem;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 0.75rem;
}

.pr-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  flex-grow: 1;
  padding-right: 0.5rem;
}

/* PR Item Card */
.pr-item-card {
  background: rgba(120, 120, 120, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  transition: all var(--transition-fast);
}

.pr-item-card:hover {
  background: rgba(120, 120, 120, 0.08);
  border-color: rgba(120, 120, 120, 0.15);
}

.pr-thumb {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border-glass);
}

.pr-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex-grow: 1;
}

.pr-item-info span {
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: bold;
}

.pr-schedule-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.pr-schedule-text i {
  color: var(--color-assigned);
}

.pr-status-badge {
  font-size: 0.65rem;
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  font-weight: bold;
  align-self: flex-start;
}

.pr-status-badge.active-pr {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-completed);
}

.pr-status-badge.scheduled-pr {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary);
}

.pr-status-badge.expired-pr {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-overdue);
}

.pr-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 4rem 2rem;
  color: var(--text-dim);
  text-align: center;
}

.pr-empty i {
  font-size: 2.5rem;
}

.pr-empty p {
  font-size: 0.85rem;
}

/* Authentication Panel styling */
.auth-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 2rem 0;
  animation: fadeIn var(--transition-normal) forwards;
}

.auth-card {
  width: 100%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
}

.admin-status-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  transition: background var(--transition-normal), border var(--transition-normal);
}

/* ----------------------------------------------------
   VIEW 4: HOMEWORK CALENDAR VIEW LAYOUT
   ---------------------------------------------------- */
.calendar-wrapper {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.calendar-icon-circle {
  width: 50px;
  height: 50px;
  background: var(--grad-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.calendar-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 1.25rem;
  flex-wrap: wrap;
}

.calendar-title-info {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.calendar-title-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.calendar-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.calendar-navigation-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.calendar-grid-container {
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* 7 columns for Sun - Sat */
.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 0.75rem;
  margin-bottom: 0.5rem;
  text-align: center;
}

.weekday-header {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.calendar-days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.75rem;
}

/* Individual Day cell */
.calendar-day-cell {
  min-height: 120px;
  background: rgba(120, 120, 120, 0.03);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.calendar-day-cell:hover {
  background: rgba(120, 120, 120, 0.08);
  border-color: rgba(99, 102, 241, 0.25);
  transform: translateY(-2px);
}

/* Style for cells not in current month */
.calendar-day-cell.inactive-month-day {
  opacity: 0.25;
  cursor: default;
  pointer-events: none;
}

/* Style for today */
.calendar-day-cell.today-cell {
  border: 2px solid var(--primary);
  background: rgba(99, 102, 241, 0.05);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.15);
}

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

.day-number {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.today-cell .day-number {
  background: var(--primary);
  color: #fff;
}

.day-status-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.day-status-indicator.has-overdue { background-color: var(--color-overdue); }
.day-status-indicator.has-assigned { background-color: var(--color-assigned); }

/* Day tasks container */
.day-tasks-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  flex-grow: 1;
  overflow-y: auto;
  max-height: 80px;
}

/* Tiny compact task label tags */
.calendar-task-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: block;
}

.calendar-task-tag.tag-assigned {
  background: rgba(6, 182, 212, 0.15);
  color: var(--color-assigned);
  border-left: 2px solid var(--color-assigned);
}

.calendar-task-tag.tag-overdue {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-overdue);
  border-left: 2px solid var(--color-overdue);
}

/* ----------------------------------------------------
   MODAL / POPUP OVERLAYS & FULL-SCREEN PR
   ---------------------------------------------------- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(3, 7, 18, 0.65);
  backdrop-filter: var(--blur-modal);
  -webkit-backdrop-filter: var(--blur-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  animation: modalFadeIn var(--transition-normal) forwards;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Fullscreen PR style */
.pr-modal-overlay {
  background: rgba(0, 0, 0, 0.85);
  width: 100vw;
  height: 100vh;
}

.pr-fullscreen-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.pr-immersive-image-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  padding: 2.5rem;
}

.pr-immersive-image-wrapper img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 50px rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.15);
  animation: modalScaleIn var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Absolute Floating close X button for full screen */
.fullscreen-close-btn {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-overdue);
  color: #fff;
  border: 2px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.8rem;
  box-shadow: 0 10px 25px rgba(239, 68, 68, 0.5);
  z-index: 1005;
  transition: all var(--transition-normal);
}

.fullscreen-close-btn:hover {
  transform: scale(1.1) rotate(90deg);
  background: hsl(355, 85%, 45%);
}

.fullscreen-close-btn:active {
  transform: scale(0.95);
}

@keyframes modalScaleIn {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Confirm Delete Modal Content */
.confirm-modal-content {
  max-width: 420px;
  width: 90%;
  padding: 2.2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  animation: modalScaleIn var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.confirm-icon-wrapper {
  width: 60px;
  height: 60px;
  background: rgba(239, 68, 68, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.confirm-modal-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.confirm-modal-content p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.confirm-actions {
  display: flex;
  gap: 1rem;
  width: 100%;
  margin-top: 0.5rem;
}

.confirm-actions .btn {
  flex: 1;
}

/* ----------------------------------------------------
   TOAST NOTIFICATION SYSTEM
   ---------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 9999;
}

.toast {
  background: var(--bg-card);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-lg);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-width: 300px;
  max-width: 400px;
  animation: toastIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  border-left: 4px solid var(--primary);
}

@keyframes toastIn {
  from { transform: translateX(100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Animating out the toast when it's dismissed */
@keyframes toastOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120px); opacity: 0; }
}

.toast.toast-success { border-left-color: var(--color-completed); }
.toast.toast-error { border-left-color: var(--color-overdue); }
.toast.toast-info { border-left-color: var(--color-assigned); }

.toast i {
  font-size: 1.3rem;
}

.toast.toast-success i { color: var(--color-completed); }
.toast.toast-error i { color: var(--color-overdue); }
.toast.toast-info i { color: var(--color-assigned); }

.toast-content {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.toast-title {
  font-size: 0.88rem;
  font-weight: 700;
}

.toast-message {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ----------------------------------------------------
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ---------------------------------------------------- */
@media (max-width: 1024px) {
  .app-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    height: auto;
    position: relative;
    padding: 1.5rem;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    border-right: none;
    border-bottom: 1px solid var(--border-glass);
  }

  .sidebar-brand {
    margin-bottom: 0;
  }

  .sidebar-nav {
    flex-direction: row;
    flex-grow: 0;
    gap: 0.5rem;
  }

  .nav-item {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }

  .sidebar-footer {
    display: none;
  }

  .main-content {
    padding: 1.5rem;
  }

  .pr-layout-grid {
    grid-template-columns: 1fr;
  }
  
  .pr-list-container {
    height: auto;
    max-height: 500px;
  }
}

@media (max-width: 768px) {
  .sidebar {
    flex-direction: column;
    gap: 1rem;
  }
  
  .sidebar-brand {
    align-self: flex-start;
  }
  
  .sidebar-nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .header-clock-container {
    width: 100%;
  }

  .stats-overview {
    grid-template-columns: 1fr;
  }

  .view-header-row {
    flex-direction: column;
    align-items: stretch;
  }

  .tabs-container {
    justify-content: space-between;
  }

  .tab-btn {
    flex: 1;
    justify-content: center;
    padding: 0.75rem 0.5rem;
    font-size: 0.8rem;
  }

  .search-container {
    width: 100%;
  }

  .task-list-grid {
    grid-template-columns: 1fr;
  }

  .form-container {
    padding: 1.5rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .col-span-2 {
    grid-column: span 1;
  }
  
  .pr-immersive-image-wrapper {
    padding: 1rem;
  }

  .fullscreen-close-btn {
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
  }

  .calendar-weekdays {
    display: none;
  }

  .calendar-days-grid {
    grid-template-columns: repeat(7, 1fr);
    gap: 0.4rem;
  }

  .calendar-day-cell {
    min-height: 70px;
    padding: 0.35rem;
  }

  .day-tasks-list {
    max-height: 40px;
  }
  
  .calendar-task-tag {
    font-size: 0.65rem;
    padding: 0.1rem;
  }
}