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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.navbar {
    background-color: #2c3e50;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar a {
    color: white;
    text-decoration: none;
    margin-left: 1rem;
}

.navbar a:hover {
    color: #3498db;
}

.logout-btn {
    background: none;
    border: none;
    color: white;
    font-size: inherit;
    font-family: inherit;
    margin-left: 1rem;
    padding: 0;
    cursor: pointer;
}

.logout-btn:hover {
    color: #3498db;
}

.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-primary { background: #3498db; color: white; }
.btn-success { background: #27ae60; color: white; }
.btn-danger  { background: #e74c3c; color: white; }
.btn-warning { background: #f39c12; color: white; }

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.priority-high   { border-left: 4px solid #e74c3c; }
.priority-medium { border-left: 4px solid #f39c12; }
.priority-low    { border-left: 4px solid #27ae60; }

.task-completed {
    opacity: 0.6;
    text-decoration: line-through;
}

.message {
    padding: 0.75rem 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.message.success { background: #d4edda; color: #155724; }
.message.error   { background: #f8d7da; color: #721c24; }