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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-container {
  max-width: 400px;
  margin: 100px auto;
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  min-height: 600px;
  display: block;
}

.app-container.hidden {
  display: none;
}

h1 {
  margin-bottom: 10px;
  color: #333;
  font-size: 32px;
}

h2 {
  margin-bottom: 20px;
  color: #333;
  font-size: 24px;
}

h3 {
  margin-bottom: 15px;
  color: #333;
  font-size: 18px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.username {
  color: #667eea;
  font-weight: 600;
}

.date {
  color: #999;
  margin-bottom: 30px;
  font-size: 14px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
}

.btn-secondary {
  background: #e0e0e0;
  color: #333;
}

.btn-secondary:hover {
  background: #d0d0d0;
}

.btn-danger {
  background: #f44336;
  color: white;
}

.btn-danger:hover {
  background: #da190b;
}

.btn-small {
  padding: 5px 10px;
  font-size: 12px;
  margin-right: 5px;
}

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

label {
  display: block;
  margin-bottom: 5px;
  color: #333;
  font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="email"] {
  width: 100%;
  padding: 12px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  font-size: 14px;
}

input:focus {
  outline: none;
  border-color: #667eea;
}

.progress-section {
  margin-bottom: 40px;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 12px;
}

.progress-text {
  font-size: 18px;
  font-weight: 600;
  color: #333;
  margin-bottom: 15px;
}

.progress-bar {
  height: 10px;
  background: #e0e0e0;
  border-radius: 5px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #667eea, #764ba2);
  width: 0%;
  transition: width 0.3s ease;
}

.task-management {
  margin-bottom: 30px;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 12px;
}

.task-input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.task-input-group input {
  flex: 1;
}

.task-list {
  max-height: 400px;
  overflow-y: auto;
}

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  background: white;
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: move;
  border: 2px solid transparent;
  transition: all 0.2s;
}

.task-item:hover {
  border-color: #667eea;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.task-item.dragging {
  opacity: 0.5;
}

.task-item.drag-over {
  border-color: #667eea;
  border-style: dashed;
  background: #f8f9ff;
}

.task-item-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.drag-handle {
  cursor: grab;
  color: #999;
  font-size: 18px;
  user-select: none;
}

.drag-handle:active {
  cursor: grabbing;
}

.tasks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
}

.task-btn {
  padding: 25px 15px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  background: white;
  color: #333;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  text-align: center;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}

.task-btn:hover:not(.done) {
  border-color: #667eea;
  background: #f8f9ff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
}

.task-btn.done {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border-color: #667eea;
  cursor: default;
}

.task-btn.done:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.task-time {
  font-size: 13px;
  margin-top: 8px;
  opacity: 0.9;
  font-weight: 500;
}

.undo-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255, 255, 255, 0.3);
  border: none;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 11px;
  cursor: pointer;
  color: white;
  transition: all 0.2s;
}

.undo-btn:hover {
  background: rgba(255, 255, 255, 0.5);
  transform: scale(1.1);
}

.celebration {
  margin-top: 40px;
  padding: 30px;
  background: linear-gradient(135deg, #ffd89b, #19547b);
  border-radius: 12px;
  text-align: center;
  color: white;
  display: none;
}

.celebration.show {
  display: block;
  animation: bounce 0.6s ease-in-out;
}

@keyframes bounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.celebration h2 {
  font-size: 28px;
  margin-bottom: 10px;
}

.error {
  background: #fee;
  color: #c33;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: none;
}

.error.show {
  display: block;
}

.success {
  background: #efe;
  color: #3c3;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: none;
}

.success.show {
  display: block;
}

.hidden {
  display: none !important;
}

.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  border-bottom: 2px solid #e0e0e0;
}

.tab {
  padding: 12px 24px;
  cursor: pointer;
  border: none;
  background: none;
  color: #666;
  font-weight: 600;
  font-size: 15px;
  border-bottom: 3px solid transparent;
  transition: all 0.3s;
}

.tab.active {
  color: #667eea;
  border-bottom-color: #667eea;
}

.tab:hover {
  color: #667eea;
  background: #f8f9ff;
}

.tab-content {
  display: none;
}

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

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
}

.stat-card h3 {
  font-size: 36px;
  margin-bottom: 10px;
  color: white;
}

.stat-card p {
  font-size: 14px;
  opacity: 0.9;
}

.user-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.user-table th {
  background: #f8f9fa;
  padding: 12px;
  text-align: left;
  font-weight: 600;
  color: #333;
  border-bottom: 2px solid #e0e0e0;
}

.user-table td {
  padding: 12px;
  border-bottom: 1px solid #e0e0e0;
}

.user-table tr:hover {
  background: #f8f9ff;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.badge-admin {
  background: #667eea;
  color: white;
}

.badge-user {
  background: #e0e0e0;
  color: #666;
}