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

.container {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 800px;
}

h1, h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 25px;
}

h1 {
    font-size: 2.5em;
    font-weight: 300;
    color: #34495e;
}

form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
}

input[type="text"], input[type="date"], select {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

input[type="text"]:focus, input[type="date"]:focus, select:focus {
    outline: none;
    border-color: #3498db;
    background: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

button {
    padding: 12px 20px;
    border: none;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

button:hover {
    background: linear-gradient(135deg, #2980b9, #1f5f8b);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

/* Message System */
.message {
    padding: 15px;
    margin: 15px 0;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.message-success {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    color: white;
    border: none;
}

.message-error {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
}

.message-info {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 25px;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

th, td {
    padding: 15px;
    border: none;
    text-align: left;
}

th {
    background: linear-gradient(135deg, #34495e, #2c3e50);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
}

tr:nth-child(even) {
    background-color: #f8f9fa;
}

tr:hover {
    background-color: #e3f2fd;
    transition: background-color 0.3s ease;
}

td .delete, td .edit, td .save, td .cancel {
    cursor: pointer;
    margin-left: 8px;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

td .delete {
    color: white;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
}

td .edit {
    color: white;
    background: linear-gradient(135deg, #3498db, #2980b9);
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
}

td .save {
    color: white;
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    box-shadow: 0 2px 8px rgba(46, 204, 113, 0.3);
}

td .cancel {
    color: white;
    background: linear-gradient(135deg, #95a5a6, #7f8c8d);
    box-shadow: 0 2px 8px rgba(149, 165, 166, 0.3);
}

td .delete:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
}

td .edit:hover {
    background: linear-gradient(135deg, #2980b9, #1f5f8b);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.4);
}

td .save:hover {
    background: linear-gradient(135deg, #27ae60, #1e8449);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46, 204, 113, 0.4);
}

td .cancel:hover {
    background: linear-gradient(135deg, #7f8c8d, #6c7b7d);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(149, 165, 166, 0.4);
}

/* Inline Editing Styles */
.edit-input {
    width: 100%;
    padding: 8px 12px;
    border: 2px solid #3498db;
    border-radius: 6px;
    font-size: 14px;
    background: white;
    transition: all 0.3s ease;
}

.edit-input:focus {
    outline: none;
    border-color: #2980b9;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

tr.completed td {
    text-decoration: line-through;
    color: #95a5a6;
    background-color: #f8f9fa;
}

#filters {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
    gap: 15px;
}

#filters button {
    flex: 1;
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    box-shadow: 0 4px 15px rgba(155, 89, 182, 0.3);
}

#filters button:hover {
    background: linear-gradient(135deg, #8e44ad, #7d3c98);
    box-shadow: 0 6px 20px rgba(155, 89, 182, 0.4);
}

#clear-completed-btn {
    background: linear-gradient(135deg, #e67e22, #d35400);
    box-shadow: 0 4px 15px rgba(230, 126, 34, 0.3);
    margin: 20px 0;
}

#clear-completed-btn:hover {
    background: linear-gradient(135deg, #d35400, #ba4a00);
    box-shadow: 0 6px 20px rgba(230, 126, 34, 0.4);
}

#export-btn, #import-btn {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
    margin: 5px;
}

#export-btn:hover, #import-btn:hover {
    background: linear-gradient(135deg, #e67e22, #d35400);
    box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
}

/* Priority Color Coding */
.priority-high {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1), rgba(192, 57, 43, 0.1));
    border-left: 4px solid #e74c3c;
}

.priority-high:hover {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.15), rgba(192, 57, 43, 0.15));
}

.priority-medium {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.1), rgba(230, 126, 34, 0.1));
    border-left: 4px solid #f39c12;
}

.priority-medium:hover {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.15), rgba(230, 126, 34, 0.15));
}

.priority-low {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.1), rgba(39, 174, 96, 0.1));
    border-left: 4px solid #2ecc71;
}

.priority-low:hover {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.15), rgba(39, 174, 96, 0.15));
}

/* Priority Labels */
.priority-label {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: white;
    min-width: 60px;
    text-align: center;
}

.priority-label.high {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
}

.priority-label.medium {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    box-shadow: 0 2px 8px rgba(243, 156, 18, 0.3);
}

.priority-label.low {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    box-shadow: 0 2px 8px rgba(46, 204, 113, 0.3);
}

/* Enhanced table styling for priority colors */
table tr {
    transition: all 0.3s ease;
}

table tr:hover {
    transform: translateX(2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Completed task styling with priority awareness */
tr.completed.priority-high td {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.05), rgba(192, 57, 43, 0.05));
    border-left: 4px solid rgba(231, 76, 60, 0.3);
}

tr.completed.priority-medium td {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.05), rgba(230, 126, 34, 0.05));
    border-left: 4px solid rgba(243, 156, 18, 0.3);
}

tr.completed.priority-low td {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.05), rgba(39, 174, 96, 0.05));
    border-left: 4px solid rgba(46, 204, 113, 0.3);
}

/* Copyright Footer */
.copyright {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    color: #95a5a6;
    font-size: 14px;
    font-weight: 300;
    letter-spacing: 0.5px;
}

.copyright p {
    margin: 0;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.copyright:hover p {
    opacity: 1;
}

@media (max-width: 600px) {
    .container {
        width: 95%;
        padding: 20px;
        margin: 10px;
    }

    form {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
    
    #filters {
        flex-direction: column;
        gap: 10px;
    }
    
    table {
        font-size: 14px;
    }
    
    th, td {
        padding: 10px 8px;
    }
    
    h1 {
        font-size: 2em;
    }
}