styles.css

* {
    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;
    color: #333;
}

/* Auth Section */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.auth-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #667eea;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #dc3545;
    color: white;
    padding: 8px 16px;
    font-size: 14px;
}

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

.btn-success {
    background: #28a745;
    color: white;
    padding: 8px 16px;
    font-size: 14px;
}

.btn-success:hover {
    background: #218838;
}

.btn-small {
    padding: 6px 12px;
    font-size: 14px;
}

.auth-switch {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.auth-switch a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

.error-message {
    color: #dc3545;
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
}

/* App Section */
.app-container {
    min-height: 100vh;
    background: white;
}

.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.app-header h1 {
    font-size: 28px;
    font-weight: 700;
}

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

.user-info span {
    font-weight: 600;
}

.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Task Form */
.task-form-container {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.task-form-container h3 {
    margin-bottom: 20px;
    color: #667eea;
}

/* Filters */
.filters-container {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    align-items: center;
}

.search-box {
    flex: 1;
    min-width: 200px;
}

.search-box input {
    width: 100%;
    padding: 12px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.filter-buttons {
    display: flex;
    gap: 10px;
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.filter-btn:hover,
.filter-btn.active {
    background: #667eea;
    color: white;
}

.priority-filter select {
    padding: 10px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 16px;
    cursor: pointer;
    background: white;
}

.priority-filter select:focus {
    outline: none;
    border-color: #667eea;
}

/* Task List */
.tasks-container {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.tasks-list {
    display: grid;
    gap: 20px;
}

.task-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    border-left: 4px solid #667eea;
}

.task-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.task-card.priority-high {
    border-left-color: #dc3545;
}

.task-card.priority-medium {
    border-left-color: #ffc107;
}

.task-card.priority-low {
    border-left-color: #28a745;
}

.task-card.completed {
    opacity: 0.7;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: #999;
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.task-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.task-description {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
}

.task-meta {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 15px;
    font-size: 14px;
    color: #888;
}

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

.priority-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.priority-badge.high {
    background: #ffebee;
    color: #dc3545;
}

.priority-badge.medium {
    background: #fff3cd;
    color: #ffc107;
}

.priority-badge.low {
    background: #d4edda;
    color: #28a745;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.pending {
    background: #e3f2fd;
    color: #2196f3;
}

.status-badge.completed {
    background: #d4edda;
    color: #28a745;
}

.task-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.task-actions button {
    flex: 1;
    min-width: 80px;
}

.no-tasks {
    text-align: center;
    color: #999;
    font-size: 18px;
    padding: 40px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    color: #667eea;
}

.close-modal {
    font-size: 28px;
    cursor: pointer;
    color: #999;
    transition: color 0.3s;
}

.close-modal:hover {
    color: #333;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.modal-buttons button {
    flex: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .app-main {
        padding: 20px 15px;
    }

    .task-form-container {
        padding: 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filters-container {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-buttons {
        justify-content: center;
    }

    .task-header {
        flex-direction: column;
    }

    .task-actions {
        flex-direction: column;
    }

    .task-actions button {
        width: 100%;
    }

    .auth-form {
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 22px;
    }

    .task-title {
        font-size: 16px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}