/* Dashboard Layout Variables */
html,
body {
  overflow-x: hidden;
  max-width: 100vw;
}

:root {
  --primary: #7C3AED;
  --primary-hover: #6D28D9;
  --secondary: #8B5CF6;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --bg-light: #F3F4F6;
  --bg-card: #FFFFFF;
  --text-main: #111827;
  --text-muted: #6B7280;
  --border-color: #E5E7EB;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --radius-md: 16px;
  --radius-lg: 24px;

  --bg-dots: rgba(0, 0, 0, 0.05);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --pomodoro-ring: 283;
}

[data-theme="dark"] {
  --bg-light: #0d1117;
  --bg-card: #161b22;
  --text-main: #F9FAFB;
  --text-muted: #9CA3AF;
  --border-color: #30363d;
  --bg-dots: rgba(255, 255, 255, 0.03);
}

html {
  scroll-behavior: smooth;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 10px;
  border: 1px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--secondary) 0%, #818cf8 100%);
}

::-webkit-scrollbar-corner {
  background: transparent;
}

body {
  background-color: var(--bg-light);
  background-image: radial-gradient(var(--bg-dots) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
}

a {
  text-decoration: none;
  color: var(--primary);
  transition: var(--transition);
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  transition: var(--transition);
}

input,
select,
textarea {
  font-family: inherit;
}

/* Utilities */
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  transition: var(--transition);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
  filter: brightness(1.05);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger) 0%, #fca5a5 100%);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
  transition: var(--transition);
  border: none;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.4);
  filter: brightness(1.05);
}

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  background: var(--bg-card);
  transition: var(--transition);
}

.btn-outline:hover {
  background: var(--bg-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: rgba(124, 58, 237, 0.2);
}


/* Glassmorphism for Auth */
.glass-panel {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px 0 rgba(31, 38, 135, 0.1);
}

[data-theme="dark"] .glass-panel {
  background: rgba(17, 24, 39, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.3);
}

/* --- Button Loader Animation --- */
.loader {
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid #ffffff;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

.calendar-wrapper {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 2rem;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  background: var(--border-color);
  gap: 1px;
  min-width: 600px;
  /* Ensures the 7 columns don't squash into illegibility on mobile devices */
}

.calendar-day-header {
  background: var(--bg-card);
  padding: 1rem;
  text-align: center;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.calendar-cell {
  background: var(--bg-card);
  min-height: 120px;
  padding: 0.5rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: background-color 0.2s;
}

.calendar-cell:hover {
  background: var(--bg-body);
}

.calendar-cell.empty {
  background: var(--bg-body);
  opacity: 0.5;
}

.calendar-date-number {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  align-self: flex-end;
  margin-bottom: 0.5rem;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.calendar-date-number.today {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.calendar-event {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
  border-left: 2px solid var(--warning);
  cursor: pointer;
  max-width: 100%;
  display: block;
}

.calendar-event.exam {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border-left-color: var(--danger);
}

/* Calendar Legend */
.calendar-legend {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .calendar-grid {
    min-width: 0;
  }

  .calendar-day-header {
    padding: 0.5rem 0.1rem;
    font-size: 0.75rem;
  }

  /* Make the cell a css grid to neatly align dot indicators */
  .calendar-cell {
    min-height: 60px;
    padding: 0.25rem 0.15rem;
    display: grid !important;
    grid-template-columns: repeat(auto-fit, 6px);
    justify-content: center;
    align-content: start;
    gap: 3px;
    position: relative;
    border-radius: 8px;
    /* Softer look on mobile */
  }

  .calendar-date-number {
    grid-column: 1 / -1;
    justify-self: center;
    width: 26px;
    height: 26px;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Transform event pills into native-style tiny dots */
  .calendar-event {
    position: static !important;
    grid-column: auto;
    width: 6px !important;
    height: 6px !important;
    padding: 0 !important;
    margin: 0 !important;
    border-radius: 50% !important;
    border: none !important;
    font-size: 0 !important;
    color: transparent !important;
    background: var(--warning) !important;
    /* Unit Due */
    opacity: 1 !important;
  }

  .calendar-event.exam {
    background: var(--danger) !important;
    /* Exam */
  }

  .calendar-cell.empty {
    background: transparent;
  }
}

/* Modals */
/* Forms */
.form-group {
  margin-bottom: 1.5rem;
  position: relative;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-light);
  color: var(--text-main);
  transition: var(--transition);
  font-size: 1rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

/* Style number input spin buttons */
input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Floating labels */
.floating-group {
  position: relative;
  margin-bottom: 1.5rem;
}

.floating-control {
  width: 100%;
  padding: 1.25rem 1rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-light);
  color: var(--text-main);
  font-size: 1rem;
  transition: var(--transition);
}

[data-theme="dark"] .floating-control {
  background-color: rgba(99, 102, 241, 0.05);
}

.floating-label {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  color: var(--text-muted);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  font-size: 1rem;
}

.floating-control:focus~.floating-label,
.floating-control:not(:placeholder-shown)~.floating-label {
  top: 0;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--primary);
  background: var(--bg-card);
  padding: 0 0.4rem;
  margin-top: -0.1rem;
  border-radius: 4px;
}

.floating-control:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.35s cubic-bezier(0.25, 1, 0.5, 1) forwards;
  will-change: opacity, transform;
}

.dropdown-container {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 150px;
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 100;
}

.dropdown-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  text-align: left;
  background: none;
  border: none;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.dropdown-item:hover {
  background-color: rgba(79, 70, 229, 0.05);
}

.dropdown-item.text-danger {
  color: var(--danger);
}

.dropdown-item.text-danger:hover {
  background-color: rgba(239, 68, 68, 0.05);
}

/* Hide Dropdown Features on Desktop */
@media (min-width: 769px) {
  .dropdown-caret {
    display: none !important;
  }

  .dropdown-menu {
    display: none !important;
  }

  .dropdown-container {
    cursor: default !important;
    pointer-events: none;
  }
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  overflow-x: hidden;
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
  width: 100%;
}

@media (min-width: 768px) {
  .charts-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

.chart-container {
  width: 100%;
  max-width: 100vw;
  overflow: hidden;
}

.chart-wrapper {
  position: relative;
  height: 300px;
  width: 100%;
  max-width: 100%;
}

/* Loader */
.loader {
  border: 3px solid rgba(79, 70, 229, 0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Theme Switch with Icons */
.theme-switch {
  position: relative;
  display: inline-block;
  width: 56px;
  height: 30px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-light);
  border: 1px solid var(--border-color);
  transition: .4s;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4px;
}

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

.slider svg {
  width: 14px;
  height: 14px;
  z-index: 1;
}

.sun-icon {
  color: #F59E0B;
}

.moon-icon {
  color: #9CA3AF;
}

.toggle-circle {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background-color: #fff;
  transition: .4s;
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

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

.theme-switch input:checked+.slider .toggle-circle {
  transform: translateX(26px);
}

[data-theme="dark"] .toggle-circle {
  background-color: #111827;
}

/* --- Pomodoro Timer --- */
.tracker-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .tracker-grid {
    grid-template-columns: 3fr 2fr;
  }
}

.pomodoro-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem;
}

.pomodoro-circle-container {
  position: relative;
  width: 180px;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pomodoro-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  /* Start from top */
}

.pomodoro-ring-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 4;
}

.pomodoro-ring-progress {
  fill: none;
  stroke: var(--primary);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: var(--pomodoro-ring);
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.pomodoro-time-display {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  /* Prevents text jumping */
  z-index: 10;
}

/* Hidden Utility */
.hidden {
  display: none !important;
}

/* --- Premium Hero Greeting --- */
.hero-greeting {
  font-size: 2.25rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.25rem;
}

.hero-greeting .greeting-time {
  color: var(--text-main);
}

.hero-greeting .greeting-name {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.hero-greeting .wave-emoji {
  animation-name: wave-animation;
  animation-duration: 2.5s;
  animation-iteration-count: infinite;
  transform-origin: 70% 70%;
  display: inline-block;
}

@keyframes wave-animation {
  0% {
    transform: rotate(0.0deg)
  }

  10% {
    transform: rotate(14.0deg)
  }

  20% {
    transform: rotate(-8.0deg)
  }

  30% {
    transform: rotate(14.0deg)
  }

  40% {
    transform: rotate(-4.0deg)
  }

  50% {
    transform: rotate(10.0deg)
  }

  60% {
    transform: rotate(0.0deg)
  }

  100% {
    transform: rotate(0.0deg)
  }
}

@media (max-width: 768px) {
  .hero-greeting {
    font-size: 1.75rem !important;
  }
}

@media (min-width: 769px) {
  .hidden-desktop {
    display: none !important;
  }
}

/* Responsive Flatpickr UI */
@media (max-width: 480px) {
  .flatpickr-calendar {
    transform: scale(0.85);
    transform-origin: top center;
  }
}



/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
  width: 100%;
}

.site-footer strong {
  color: var(--primary);
  font-weight: 600;
}