:root {
    --primary-color: #1f9fdf;
    --secondary-color: #f5f6fa;
    --text-color: #2c3e50;
    --border-color: #e1e8ed;
    --success-color: #2ecc71;
    --delete-color: #e74c3c;
    --work-color: #4a90e2;
    --personal-color: #2ecc71;
    --health-color: #9b59b6;
    --errands-color: #f39c12;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.date-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.date-nav button {
    background: rgb(20, 20, 20);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.date-nav button:hover {
    background: var(--primary-color);
    color: rgb(253, 253, 251);
}

.add-task {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

input[type="text"],
input[type="time"],
select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

input[type="text"] {
    flex: 1;
}

button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.tasks-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.time-slots {
    border-right: 1px solid var(--border-color);
    padding: 1rem;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    animation: slideIn 0.3s ease;
}

.task-item:last-child {
    border-bottom: none;
}

.task-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.task-category {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
    color: white;
}

.task-category.work { background: var(--work-color); }
.task-category.personal { background: var(--personal-color); }
.task-category.health { background: var(--health-color); }
.task-category.errands { background: var(--errands-color); }

.task-actions {
    display: flex;
    gap: 0.5rem;
}

.task-time {
    color: #666;
    font-size: 0.875rem;
    min-width: 80px;
}

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

.complete-btn {
    background: var(--success-color);
}

.task-item.completed .task-content {
    text-decoration: line-through;
    opacity: 0.7;
}

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

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .add-task {
        flex-direction: column;
    }
    
    .task-item {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .task-actions {
        width: 100%;
        justify-content: flex-end;
    }
}