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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    width: 650px;
    max-width: 100%;
    padding: 25px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
    font-size: 28px;
}

/* Add Task Form */
.add-task-form {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

#taskTitle {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 10px;
}

#taskDesc {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 10px;
}

.datetime-row {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.datetime-row input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
}

#addBtn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s;
}

#addBtn:hover {
    transform: scale(1.02);
}

/* Filter Section */
.filter-section {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
}

.filter-section button {
    padding: 10px 20px;
    background: #e9ecef;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.filter-section button.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.filter-section button:hover {
    transform: translateY(-2px);
}

/* Task Cards */
.task-card {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
    transition: all 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.task-card:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transform: translateX(5px);
}

.task-card.completed {
    opacity: 0.7;
    background: #f5f5f5;
}

.task-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.task-title {
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    flex: 1;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: #888;
}

.task-desc {
    color: #666;
    font-size: 14px;
    margin-bottom: 10px;
    padding-left: 5px;
}

.task-meta {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: #999;
    margin-bottom: 10px;
    padding-left: 5px;
}

.task-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.delete-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}

.delete-btn:hover {
    background: #c82333;
}

/* Counter */
.counter {
    text-align: center;
    padding-top: 15px;
    border-top: 1px solid #eee;
    color: #666;
    font-weight: bold;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px;
    color: #999;
    font-size: 16px;
}

/* Responsive */
@media (max-width: 500px) {
    .container {
        padding: 15px;
    }
    .datetime-row {
        flex-direction: column;
    }
    .task-header {
        flex-wrap: wrap;
    }
    .delete-btn {
        margin-top: 8px;
    }
}