:root {
  --primary-color: #fd5757;
  --primary-hover: #c23616;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #17a2b8;

  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-light: #95a5a6;

  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-sidebar: #fafafa;
  --bg-hover: #f1f3f4;

  --border-color: #e9ecef;
  --border-radius: 8px;
  --border-radius-small: 4px;

  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 10px 25px rgba(0, 0, 0, 0.15);

  --transition: all 0.2s ease;
  --transition-slow: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  font-size: 14px;
}

/* Auth Screen */
.auth-screen {
  position: fixed;
  inset: 0;
  background: #fff;
  display: flex;
  align-items: stretch;
  justify-content: center;
  z-index: 2000;
}

.auth-wrapper {
  display: flex;
  width: 100%;
}
.auth-left {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f7f7f8;
}
.auth-right {
  flex: 1;
  background: var(--primary-color);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  text-align: center;
}

.auth-panel {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 520px;
  max-width: 90%;
  padding: 24px;
  box-shadow: var(--shadow-medium);
}
.auth-left-header {
  text-align: center;
  margin-bottom: 12px;
}
.welcome-icon {
  color: var(--primary-color);
  font-size: 20px;
  margin-bottom: 8px;
}
.auth-left-header h2 {
  font-size: 22px;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.auth-left-header p {
  color: var(--text-secondary);
  font-size: 13px;
}

.auth-form {
  padding: 8px 0 0 0;
}

.auth-form .form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.auth-form label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.auth-form input {
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-small);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.auth-form input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(219, 76, 63, 0.1);
}

.auth-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 6px;
}
.btn-primary{
    display: flex;
    align-items: center;
    justify-content: center;
}
.auth-actions .btn-primary {
  width: 100%;
}

.auth-switch {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
    justify-content: center;
}
.auth-switch .link-btn {
  background: none;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  padding: 0 4px;
}

.auth-error {
  margin-top: 10px;
  color: var(--danger-color);
  font-size: 13px;
}

.user-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  float: left;
}

.user-chip {
  background-color: var(--bg-hover);
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Right panel branding */
.brand-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: #fff;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-light);
}
.brand-title {
  font-size: 40px;
  margin: 0 0 8px 0;
  font-weight: 700;
}
.brand-subtitle {
  font-size: 16px;
  margin-bottom: 28px;
  opacity: 0.95;
}
.feature {
  display: flex;
  gap: 16px;
  margin: 25px 0;
  max-width: 560px;
}
.feature-icon {
  width: 28px;
  display: flex;
  font-size: 20px;
  /* opacity: 0.95; */
}
.feature-content {
  text-align: left;
}
.feature-content h3 {
  margin: 0;
  font-size: 18px;
}
.feature-content p {
  margin: 4px 0 0 0;
  font-size: 14px;
  line-height: 1.5;
  opacity: 0.95;
}
.brand-foot {
  margin-top: 24px;
  font-size: 13px;
  opacity: 0.9;
}

@media (max-width: 900px) {
  .auth-right {
    display: none;
  }
  .auth-left {
    flex: 1;
    background: #fff;
  }
}

.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
  width: 300px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 10;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-header i {
  color: var(--primary-color);
  font-size: 22px;
}

.sidebar-nav {
  flex: 1;
  padding: 20px 0;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  gap: 12px;
  position: relative;
}

.nav-item:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background-color: var(--primary-color);
  color: white;
  font-weight: 500;
}

.nav-item i {
  width: 18px;
  font-size: 16px;
}

.nav-item span:first-of-type {
  flex: 1;
}

.task-count {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  min-width: 20px;
  text-align: center;
}

.nav-item:not(.active) .task-count {
  background-color: var(--bg-hover);
  color: var(--text-secondary);
}

/* Progress Section */
.progress-section {
  padding: 20px;
  border-top: 1px solid var(--border-color);
  background-color: white;
}

.progress-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.progress-stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}

.stat-item {
  text-align: center;
  flex: 1;
}

.stat-number {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1;
}

.stat-label {
  font-size: 11px;
  color: var(--text-light);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.progress-bar {
  height: 8px;
  background-color: var(--bg-hover);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--primary-hover)
  );
  border-radius: 4px;
  transition: width 0.5s ease;
  width: 0%;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  overflow: hidden;
}

.main-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  background-color: white;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.header-content h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  gap: 8px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.search-container {
  display: none;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-secondary);
  padding: 8px 12px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.search-container.active {
  display: flex;
}

#search-input {
  flex: 1;
  border: none;
  background: none;
  outline: none;
  font-size: 14px;
  color: var(--text-primary);
}

#search-input::placeholder {
  color: var(--text-light);
}

/* Quick Add Task */
.quick-add {
  padding: 24px;
  background-color: white;
  border-bottom: 1px solid var(--border-color);
}

.add-task-container {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

#task-input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 16px;
  transition: var(--transition);
  outline: none;
}

#task-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(219, 76, 63, 0.1);
}

#task-input::placeholder {
  color: var(--text-light);
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 16px;
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-medium);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.task-details {
  display: none;
  background-color: var(--bg-secondary);
  padding: 16px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.task-details.active {
  display: block;
  animation: slideDown 0.3s ease;
}

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

.task-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.option-group label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.option-group input,
.option-group select {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-small);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.option-group input:focus,
.option-group select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(219, 76, 63, 0.1);
}

.option-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* Filter Bar */
.filter-bar {
  display: none;
  padding: 16px 24px;
  background-color: white;
  border-bottom: 1px solid var(--border-color);
}

.filter-bar.active {
  display: block;
}

.filter-options {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.filter-btn {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  background-color: white;
  color: var(--text-secondary);
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  background-color: var(--bg-hover);
}

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

.filter-priority {
  display: flex;
  gap: 8px;
}

.priority-filter {
  padding: 4px 8px;
  border: none;
  border-radius: var(--border-radius-small);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.priority-filter[data-priority="urgent"] {
  background-color: #ffebee;
  color: #c62828;
}

.priority-filter[data-priority="high"] {
  background-color: #fff3e0;
  color: #f57c00;
}

.priority-filter[data-priority="medium"] {
  background-color: #e8f5e8;
  color: #2e7d32;
}

.priority-filter[data-priority="low"] {
  background-color: #e3f2fd;
  color: #1565c0;
}

.priority-filter:hover {
  opacity: 0.8;
  transform: translateY(-1px);
}

/* Tasks Container */
.tasks-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-light);
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.3;
}

.empty-state h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 14px;
  max-width: 400px;
  margin: 0 auto;
}

.tasks-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Task Item */
.task-item {
  background-color: white;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.task-item:hover {
  box-shadow: var(--shadow-light);
  transform: translateY(-1px);
}

.task-item.completed {
  opacity: 0.6;
  background-color: var(--bg-secondary);
}

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

.task-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

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

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

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

.task-text {
  font-size: 15px;
  line-height: 1.4;
  margin-bottom: 4px;
  word-wrap: break-word;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
}

.task-due-date {
  display: flex;
  align-items: center;
  gap: 4px;
}

.task-due-date.overdue {
  color: var(--danger-color);
  font-weight: 500;
}

.task-due-date.today {
  color: var(--warning-color);
  font-weight: 500;
}

.task-priority {
  padding: 2px 6px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.task-priority.urgent {
  background-color: #ffebee;
  color: #c62828;
}

.task-priority.high {
  background-color: #fff3e0;
  color: #f57c00;
}

.task-priority.medium {
  background-color: #e8f5e8;
  color: #2e7d32;
}

.task-priority.low {
  background-color: #e3f2fd;
  color: #1565c0;
}

.task-project {
  padding: 2px 6px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 500;
  background-color: var(--bg-hover);
  color: var(--text-secondary);
  text-transform: capitalize;
}

.task-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: var(--transition);
}

.task-item:hover .task-actions {
  opacity: 1;
}

.task-action-btn {
  width: 32px;
  height: 32px;
  border: none;
  background-color: transparent;
  color: var(--text-light);
  border-radius: var(--border-radius-small);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.task-action-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.task-action-btn.delete:hover {
  background-color: #ffebee;
  color: var(--danger-color);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-heavy);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(219, 76, 63, 0.1);
}

.modal-footer {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  padding: 20px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .sidebar-nav {
    padding: 16px 0;
  }

  .progress-section {
    display: none;
  }

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

  .header-content h2 {
    font-size: 24px;
  }

  .quick-add {
    padding: 20px;
  }

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

  .option-actions {
    justify-content: stretch;
  }

  .option-actions button {
    flex: 1;
  }

  .tasks-container {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .sidebar-nav ul {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    padding: 0 20px;
  }

  .sidebar-nav li {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .nav-item {
    padding: 8px 16px;
    border-radius: 20px;
    margin: 4px 0;
    white-space: nowrap;
  }

  .task-item {
    padding: 12px;
  }

  .task-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

/* Loading Animation */
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading {
  animation: spin 1s linear infinite;
}

/* Success Animation */
@keyframes checkmark {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

.task-checkbox.checked i {
  animation: checkmark 0.3s ease;
}