/* ===== CSS Variables ===== */
:root {
  /* Colors */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);

  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

  --priority-low: #22c55e;
  --priority-medium: #f59e0b;
  --priority-high: #ef4444;
  --overdue: #dc2626;

  --danger: #ef4444;
  --success: #22c55e;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ===== App Container ===== */
.app-container {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(
    180deg,
    var(--bg-secondary) 0%,
    var(--bg-primary) 100%
  );
  position: relative;
}

.app-container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
}

/* ===== Header ===== */
.header {
  padding: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

.profile-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: var(--shadow-md);
}

.avatar svg {
  width: 28px;
  height: 28px;
}

.profile-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.user-role {
  font-size: 0.813rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.time-section {
  text-align: right;
}

.current-day {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.current-date {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  padding: 0 var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

/* ===== Section Styles ===== */
.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.title-icon {
  font-size: 1.125rem;
}

.task-count {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: white;
  min-width: 24px;
  text-align: center;
}

.done-count {
  background: linear-gradient(135deg, var(--success), #16a34a);
}

/* ===== Input Section ===== */
.input-section {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.task-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.task-input {
  width: 100%;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.938rem;
  resize: none;
  transition: var(--transition-normal);
}

.task-input::placeholder {
  color: var(--text-muted);
}

.task-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.priority-label {
  font-size: 0.813rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.priority-selector {
  display: flex;
  gap: var(--spacing-sm);
}

.priority-selector input[type="radio"] {
  display: none;
}

.priority-btn {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.priority-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.priority-low .priority-dot {
  background: var(--priority-low);
}

.priority-medium .priority-dot {
  background: var(--priority-medium);
}

.priority-high .priority-dot {
  background: var(--priority-high);
}

.priority-selector input[type="radio"]:checked + .priority-btn {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.priority-selector input[type="radio"]:checked + .priority-low {
  border-color: var(--priority-low);
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.3);
}

.priority-selector input[type="radio"]:checked + .priority-medium {
  border-color: var(--priority-medium);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
}

.priority-selector input[type="radio"]:checked + .priority-high {
  border-color: var(--priority-high);
  box-shadow: 0 0 12px rgba(239, 68, 68, 0.3);
}

.submit-btn {
  width: 100%;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: none;
  background: var(--accent-gradient);
  color: white;
  font-family: inherit;
  font-size: 0.938rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow:
    var(--shadow-lg),
    0 0 20px rgba(99, 102, 241, 0.4);
}

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

/* ===== Task List Sections ===== */
.todo-section,
.done-section {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.task-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  color: var(--text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state p {
  font-size: 0.938rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.empty-state span {
  font-size: 0.75rem;
}

.empty-state.hidden {
  display: none;
}

/* ===== Task Item ===== */
.task-item {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  transition: var(--transition-normal);
  animation: slideIn 0.3s ease forwards;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.task-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.1);
}

.task-item.completed {
  opacity: 0.7;
}

.task-item.completed .task-text {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-item.overdue {
  border-color: rgba(220, 38, 38, 0.5);
  background: rgba(220, 38, 38, 0.1);
}

.task-item.overdue::before {
  content: "⚠️ OVERDUE";
  position: absolute;
  top: -8px;
  right: var(--spacing-md);
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--overdue);
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.task-item {
  position: relative;
}

/* Custom Checkbox */
.checkbox-wrapper {
  position: relative;
  flex-shrink: 0;
}

.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  background: transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
}

.task-checkbox:hover {
  border-color: var(--accent-primary);
}

.task-checkbox:checked {
  background: var(--success);
  border-color: var(--success);
}

.task-checkbox:checked::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.task-content {
  flex: 1;
  min-width: 0;
}

.task-text {
  font-size: 0.875rem;
  color: var(--text-primary);
  word-wrap: break-word;
  margin-bottom: var(--spacing-xs);
  transition: var(--transition-normal);
}

.task-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.task-date {
  font-size: 0.688rem;
  color: var(--text-muted);
}

.priority-badge {
  font-size: 0.625rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.priority-badge.low {
  background: rgba(34, 197, 94, 0.2);
  color: var(--priority-low);
}

.priority-badge.medium {
  background: rgba(245, 158, 11, 0.2);
  color: var(--priority-medium);
}

.priority-badge.high {
  background: rgba(239, 68, 68, 0.2);
  color: var(--priority-high);
}

.task-actions {
  flex-shrink: 0;
}

.delete-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
}

.delete-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.delete-btn svg {
  width: 16px;
  height: 16px;
}

/* ===== Footer ===== */
.footer {
  padding: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.delete-all-btn {
  width: 100%;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: var(--transition-normal);
}

.delete-all-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: var(--danger);
}

.delete-all-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Animations ===== */
@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(20px);
  }
}

.task-item.removing {
  animation: fadeOut 0.3s ease forwards;
}

/* ===== Responsive ===== */
@media (max-width: 380px) {
  .header {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .time-section {
    text-align: left;
  }

  .priority-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.688rem;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}