:root {
  --primary: #4361ee;
  --secondary: #3a0ca3;
  --success: #4cc9f0;
  --danger: #f72585;
  --warning: #fca311;
  --info: #4895ef;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --background: #ffffff;
  --text: #212529;
  --card-bg: #ffffff;
  --border: #dee2e6;
  --shadow: rgba(0, 0, 0, 0.1);
  --input-bg: #ffffff;
}

.dark-mode {
  --primary: #4cc9f0;
  --secondary: #4895ef;
  --background: #121212;
  --text: #f8f9fa;
  --card-bg: #1e1e1e;
  --border: #2d2d2d;
  --shadow: rgba(0, 0, 0, 0.3);
  --input-bg: #2d2d2d;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0;
  margin: 0;
}

#app {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header Styles */
header {
  background-color: var(--primary);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 10px var(--shadow);
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-items {
  display: flex;
  gap: 20px;
  align-items: center;
}

.theme-toggle {
  background: none;
  border: none;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--secondary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary);
  transform: translateY(-2px);
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-danger:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* Auth Forms */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
  padding: 2rem;
}

.auth-form {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 5px 15px var(--shadow);
  padding: 2rem;
  width: 100%;
  max-width: 400px;
}

.auth-form h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background-color: var(--input-bg);
  color: var(--text);
}

.password-container {
  position: relative;
}

.toggle-password {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
}

.form-text {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--gray);
}

.auth-link {
  text-align: center;
  margin-top: 1.5rem;
}

/* Dashboard */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.welcome-text {
  font-size: 1.5rem;
}

.task-filters {
  display: flex;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  color: var(--text);
  border-radius: 20px;
  cursor: pointer;
}

.filter-btn.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

.task-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 2rem;
}

.stat-card {
  background-color: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 3px 10px var(--shadow);
  text-align: center;
}

.stat-card h3 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.task-sections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .task-sections {
    grid-template-columns: 1fr;
  }
}

.task-section {
  background-color: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 3px 10px var(--shadow);
}

.task-section h3 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary);
}

.task-list {
  list-style: none;
}

.task-item {
  background-color: var(--background);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  animation: fadeIn 0.5s ease;
  position: relative;
  overflow: hidden;
}

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

.task-item.completed {
  border-left: 4px solid var(--success);
}

.task-item.urgent {
  border-left: 4px solid var(--danger);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(247, 37, 133, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(247, 37, 133, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(247, 37, 133, 0);
  }
}

.task-title {
  font-weight: bold;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
}

.task-due {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.countdown {
  color: var(--danger);
  font-weight: bold;
}

.task-actions {
  display: flex;
  gap: 10px;
  margin-top: 0.5rem;
}

.task-actions button {
  padding: 0.25rem 0.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.875rem;
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--gray);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  animation: fadeIn 0.3s ease;
}

.modal {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 5px 15px var(--shadow);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray);
}

/* DateTime Picker */
.datetime-input {
  display: flex;
  gap: 10px;
}

.datetime-input input {
  flex: 1;
}

/* Notification */
.notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--danger);
  color: white;
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 3px 10px var(--shadow);
  animation: slideIn 0.3s ease;
  z-index: 1001;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Utilities */
.hidden {
  display: none;
}

.text-center {
  text-align: center;
}

.mt-3 {
  margin-top: 1.5rem;
}

.urgent-icon,
.countdown {
  transition: opacity 0.3s ease;
}

.task-item.urgent {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(255, 0, 0, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 0, 0, 0);
  }
}